If you have just received an IRS audit notice, the first question is almost always the same: why me? Did the IRS catch something specific? Did a software algorithm flag the return? Did someone report you? Was it random?

The honest answer is that IRS audit selection is rarely random, and “why was I selected for an IRS audit” usually has a specific, identifiable answer. The IRS receives more than 150 million individual returns each year and can examine only a small fraction of them.

By the time a return is selected for audit, it has typically survived multiple layers of screening, and the selection signals something specific about the return, the taxpayer, or the context.

This article walks through the main paths returns take to audit, explains what each path signals about the IRS’s interest in the case, and provides a practical overview of what happens after a return is selected.

The perspective is informed by Kugelman Law attorney Otto Bosch, who served as a Revenue Agent in the IRS Global High Wealth Group within the Large Business and International (LB&I) Division before joining the firm in February 2026.

The Basic Reality of IRS Audit Selection

Audit selection is a triage. The IRS uses a combination of statistical models, information matching systems, project initiatives, and human judgment to identify the returns most likely to produce meaningful adjustments. Every return that reaches a Revenue Agent’s desk has passed through that triage, which means by the time the examination opens, the IRS has already decided the return is worth investing real resources in.

The corollary matters. Selection is not random, but it also does not mean the IRS has already concluded that the return is wrong. It means the IRS believes there is enough probability of a meaningful adjustment to justify the cost of the audit. The defense’s job is to test that probability in order to show that the issues the IRS expected to find either do not exist or have a defensible explanation.

The Main Paths Returns Take to Audit

Returns reach audit through several distinct mechanisms. The path tells the defense team something about how the case will likely develop.

DIF Scoring (Discriminant Function System)

The Discriminant Function (DIF) system is the IRS’s statistical model for scoring returns based on the likelihood that an examination would produce an adjustment. Every individual return is assigned a DIF score. High-DIF returns are routed for review and potential selection.

The specific factors the DIF model weights are not public, but the model is built on historical audit results — meaning returns with characteristics similar to returns that have produced adjustments in the past will score higher. Returns with characteristics that historically correlate with clean audits will score lower. Most ordinary individual audits begin as DIF-selected cases.

Information Matching

The IRS receives extensive third-party information returns — W-2s, 1099s, K-1s, broker statements, Forms 5498, foreign account reports under FATCA, cryptocurrency exchange data, mortgage interest statements, and many others. These information returns are matched against the corresponding amounts on filed returns.

Where the data matches, no audit. Where the data does not match — a 1099 the IRS received that is not reported on the return, a K-1 missing from the return entirely, a broker statement showing dispositions not reflected in Schedule D — the mismatch generates a notice. Small mismatches typically produce a CP2000 notice that resolves through correspondence. Material mismatches can escalate into a full examination.

Related-Return Pickups

When the IRS is examining one return and identifies issues that connect to another taxpayer’s return, the related return can be opened for examination as well. A partnership audit triggers examinations of the partners. A corporation audit can trigger shareholder examinations. Family-owned business structures can produce coordinated audits across multiple related taxpayers.

Related-return pickups are one reason a single audit can quickly grow. They are also one reason that examinations involving high-net-worth families, private equity structures, and other multi-entity arrangements tend to expand once the IRS begins looking at one piece of the structure.

Compliance Projects and Initiatives

The IRS regularly announces or quietly runs enforcement initiatives focused on specific issues — syndicated conservation easements, microcaptive insurance arrangements, deferred legal fee structures, cryptocurrency reporting, foreign account compliance, employee retention credit claims, and others. Returns within the scope of an active initiative are far more likely to be selected.

Project-driven examinations look different from DIF-driven examinations. The agent has typically been trained specifically on the project’s target issue, has examined other taxpayers in the same project, and has internal guidance on what positions to develop. Recognizing a project-driven audit early is one of the most valuable defensive insights an examination can produce.

Whistleblower and Informant Referrals

The IRS Whistleblower Program pays awards for actionable information about tax noncompliance, and substantiated referrals can result in examination. Whistleblowers are sometimes disgruntled former employees, sometimes former spouses, sometimes business partners, sometimes professional informants who specialize in identifying patterns of noncompliance.

A whistleblower-initiated audit is structurally different from a DIF-selected audit. The IRS already has specific information about specific issues from someone with inside knowledge. The agent’s working hypothesis is more specific, and the IDR responses will be evaluated against information the IRS already has.

LB&I and Global High Wealth Selection

For the most complex high-net-worth and corporate examinations, returns are selected through specialized risk-based processes within the Large Business and International division. The Global High Wealth Group within LB&I uses an enterprise audit approach that considers the entire web of related entities, trusts, partnerships, and personal returns associated with a wealthy taxpayer as a coordinated whole.

Selection by LB&I or the Global High Wealth Group signals that the IRS has decided the case warrants its most experienced examination resources. These cases tend to involve longer timelines, multiple specialists, integrated analysis across many entities, and significant dollar exposure.

Random Selection (National Research Program)

The IRS periodically conducts the National Research Program (NRP), in which a statistically representative sample of returns is audited regardless of their DIF score. The NRP exists to calibrate the DIF model and to measure the tax gap. NRP audits feel random because, within their sample, they are — but the sample itself is small relative to the overall audit caseload.

How to Read Your Audit Notice for Selection Clues

The audit notice itself contains information that helps identify the selection path:

• The issuing office. Notices from IRS Service Centers usually indicate correspondence-level matters driven by information matching. Notices from field offices generally indicate more substantive examinations.
• The examiner’s title. A Tax Examiner suggests a correspondence audit. A Tax Compliance Officer suggests an office audit. A Revenue Agent suggests a field audit. Identification with LB&I or the Global High Wealth Group suggests a specialized examination.
• The issues identified. Where the notice identifies a specific issue (a missing 1099, an unsubstantiated deduction, a credit eligibility question), the selection was likely driven by that issue. Where the notice references broad areas of the return (Schedule C in its entirety, all foreign account activity, all cryptocurrency transactions), the selection was likely broader.
• The form referenced. CP2000 notices indicate information matching mismatches. Letter 566 typically initiates correspondence audits. Letter 2205 typically initiates field examinations.

For more on how the type of audit identified in your notice affects defense strategy, see our article on field audit vs. office audit vs. correspondence audit.

What the Selection Path Tells You About Your Audit

Reading the selection path is one of the first defensive moves in any audit. Different paths suggest different scope, different agent posture, and different defense priorities:

• DIF-selected audits tend to be focused on the specific issues that drove the score. Strong substantiation on those issues often produces a clean closing.
• Information-matching audits are data-driven and narrow. The defense’s job is typically to substantiate the reported position or to demonstrate why the third-party data is inaccurate.
• Related-return audits follow specific connecting issues. The defense should anticipate that the agent already has information from the related taxpayer’s return.
• Project-driven audits concentrate on the project’s target issue. The agent’s positions are likely well-developed; the defense’s job is to engage them on the specific facts of the case.
• Whistleblower audits assume the IRS has specific information from an insider. The defense should expect targeted questions and should not assume the agent is starting from neutral.
• LB&I and Global High Wealth audits are the most resource-intensive examinations the IRS conducts. The defense methodology needs to match the agency’s commitment to the case.

What Happens After Selection — The Audit Lifecycle

Once a return is selected and an examination opened, the audit unfolds along a fairly predictable arc:

Pre-contact analysis. Before any notice goes out, the agent reviews the return, prior-year filings, selection notes, and third-party data. A working hypothesis about the case is formed before the taxpayer hears anything.

Initial notice and opening conference. The taxpayer receives the audit notice. Depending on the audit type, an opening conference may be scheduled.

Information Document Requests (IDRs). The agent issues IDRs requesting documents and information. The first IDR is one of the most important documents in the entire audit — we discuss this in detail in our article on how to respond to an IRS IDR.

Issue development and fieldwork. The agent reviews documents, conducts interviews where appropriate, develops issues, and builds workpapers. This phase can last months — sometimes years — for complex examinations.

Closing. The audit closes in one of three ways: no change (the return is accepted as filed), agreed (the taxpayer accepts the proposed adjustments), or unagreed (the case proceeds to Appeals and potentially to U.S. Tax Court).

For a deeper walk-through of how the audit unfolds inside the IRS, see our pillar articles on what an IRS Revenue Agent does and inside the IRS audit playbook.

How Long Will Your Audit Take?

Audit duration varies dramatically by type and complexity:

• Correspondence audits typically resolve in a few months from the initial notice through final closing.
• Office audits typically resolve in three to six months, with the single in-person appointment as the central event.
• Field audits commonly take a year or more for substantive cases, and complex multi-year LB&I or Global High Wealth examinations can run two years or longer.

Several factors affect timing: the complexity of the issues, the responsiveness of the taxpayer and representative, whether specialists are brought in, whether the case proceeds to Appeals, and whether litigation ultimately follows. Faster is generally better for the taxpayer, but rushed responses produce worse outcomes than measured ones.

Common Misconceptions About IRS Audit Selection

Several beliefs about audit selection are common but inaccurate:

“It was random.” Almost never. With limited exceptions like the National Research Program, audit selection is driven by specific factors that flagged the return.

“I was unlucky.” Selection is not luck. It is the output of statistical models, data matching, project initiatives, and human judgment — each of which is calibrated to identify returns that warrant examination.

“The IRS is targeting me.” Very rarely. Targeting in the sense of personal animus is extremely uncommon in modern IRS practice. The selection systems are largely impersonal. What feels like targeting is almost always the output of a model or a project the taxpayer happens to fit.

“If I just amend my return, I can avoid the audit.” Sometimes — but the answer is fact-specific. Amending a return after an audit has been opened typically does not stop the audit, and amending in some scenarios (particularly where criminal exposure is possible) can create more problems than it solves. The decision should be made with counsel.

“Audits are inevitable once you reach a certain income.” High income increases audit probability, particularly for taxpayers reaching Global High Wealth thresholds. But the relationship is probabilistic, not deterministic, and many high-income taxpayers never face audits while many middle-income taxpayers do.

What You Should Do Right Now

If you have just received an audit notice, the right immediate steps are practical and measured:

1. Read the notice carefully. Identify the audit type, the issuing office, the named examiner, the issues raised, and the deadline.
2. Preserve relevant records. Do not destroy or alter any document referenced in the notice or potentially related to the issues raised. Document preservation obligations are serious.
3. Do not respond reflexively. The instinct to “explain things” quickly and put the matter behind you is almost always counterproductive. Unprepared communication with the IRS is one of the most common ways audits go badly.
4. Do not call the agent without preparation. Statements made during informal calls become part of the audit record.
5. Identify what kind of representation you need. For straightforward correspondence audits, your preparer may be sufficient. For substantive examinations, experienced controversy counsel is generally appropriate. We discuss the choice in our article on tax attorney vs CPA for IRS audit defense.
6. If any aspect of the case involves potential criminal exposure — significant unreported income, undisclosed foreign accounts, false statements to the IRS, or fabricated records — retain an attorney before any further communication with the IRS. See our article on eggshell audits explained for the underlying framework.

How Kugelman Law Approaches Selection Analysis

The first thing Kugelman Law does on a new audit matter is read the case before doing anything else. That means analyzing the selection path, identifying the likely scope of the examination, modeling the taxpayer’s exposure across the universe of issues the IRS may develop, and assessing whether any aspect of the case carries elevated risk.

Founder Alex Kugelman brings nearly two decades of federal tax controversy experience, including litigation in U.S. Tax Court and U.S. District Court. Otto Bosch brings the inside-the-IRS perspective from his time as a Revenue Agent in the LB&I Global High Wealth Group — including direct experience with the selection systems and divisional procedures that govern most substantive audits. We covered the strategic value of this combination in detail in our article on why a former IRS revenue agent attorney changes audit defense.

Representative outcomes from the firm’s audit defense practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

Frequently Asked Questions

Does the IRS audit randomly?

Almost never. With limited exceptions like the National Research Program (which audits a small statistically representative sample to calibrate the DIF model), IRS audit selection is driven by specific factors — DIF scoring, information matching, related-return pickups, compliance projects, whistleblower referrals, and specialized division processes. Most audits are the output of identifiable selection paths.

What is a DIF score?

The Discriminant Function (DIF) score is a numerical rating the IRS assigns to each return based on the likelihood that an examination would produce a meaningful adjustment. High-DIF returns are routed for review and potential selection. The specific factors the model weights are not public, but the model is built on historical audit results — meaning returns with characteristics similar to returns that have produced adjustments in the past will score higher.

Can someone report me to the IRS for tax evasion?

Yes. The IRS Whistleblower Program accepts and acts on referrals about tax noncompliance, and the program pays awards in qualifying cases. Common whistleblowers include former employees, former spouses, business partners, and professional informants. Substantiated referrals can result in examinations that look different from DIF-selected audits because the agent has specific inside information from the outset.

Can I prevent future IRS audits?

No taxpayer can guarantee future audit-free status, but several factors reduce audit probability: complete and accurate reporting, clean substantiation, consistency across years, prompt compliance with information reporting obligations, and avoidance of audit-flag positions where alternatives exist. For taxpayers with prior compliance issues, a clean voluntary disclosure or corrected return — handled with experienced counsel — can sometimes resolve historical exposure and lower future audit risk.

How long does the IRS have to audit my return?

The standard statute of limitations on assessment is three years from the date the return was filed (or its due date, if later). It extends to six years for substantial omissions of gross income exceeding 25 percent. There is no statute of limitations for fraudulent returns or non-filed returns. For FBAR and other information return failures, separate limitations periods apply.

Speak With Kugelman Law

If you have received an IRS audit notice — or have reason to believe one is coming — schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

About the Author

Alex Kugelman is the founder and managing attorney of Kugelman Law, a boutique tax controversy and cryptocurrency tax firm serving California and clients nationwide. With nearly two decades of federal tax controversy experience — including litigation in the U.S. Tax Court and U.S. District Court — Alex represents individuals and businesses in their most consequential disputes with the IRS and the California Franchise Tax Board. He is a member of the State Bar of California (No. 255463), admitted to the Bar of the U.S. Supreme Court, and served as San Francisco Chair of the Federal Bar Association’s Tax Division in 2018. He is also a member of the Marin County Assessment Appeals Board and a nationally recognized cryptocurrency tax attorney featured on the Bitcoin.tax podcast and The Mark Milton Show. Read Alex’s full bio.

Each type involves different procedures, different IRS personnel, different scope, and different stakes. Identifying which type of audit you are facing is the first defensive step in any examination.

This article walks through the three audit types from the inside — how they are conducted, who staffs them, what issues each tends to involve, and what each one signals about the IRS’s interest in the case.

The perspective is informed by Kugelman Law attorney Otto Bosch, who served as a Revenue Agent in the IRS Global High Wealth Group within the Large Business and International (LB&I) Division before joining the firm in February 2026. For broader background on how Revenue Agents operate, see our companion articles on what an IRS Revenue Agent does and inside the IRS audit playbook.

Why the Type of IRS Audit Matters

The type of audit determines almost everything else about the examination. Correspondence audits are conducted through the mail, generally by tax examiners working from IRS Service Centers, and typically focus on narrow, document-driven issues.

Office audits are conducted in person at IRS offices, generally by Tax Compliance Officers, and cover a broader scope.

Field audits are conducted at the taxpayer’s place of business or representative’s office, generally by Revenue Agents, and are the most substantive type — often involving multi-year examinations of complex returns.

The differences matter for three reasons:

Procedurally, the workflows, timelines, and document expectations differ significantly across types.

Substantively, the issues likely to arise differ based on the audit type. A correspondence audit is rarely the right vehicle for a complex partnership examination. A field audit is rarely opened for a missing 1099.

Strategically, the level and type of representation appropriate to each varies. A correspondence audit may be handled directly by the taxpayer or the preparer. A field audit conducted by an LB&I Revenue Agent almost always requires experienced controversy counsel.

Correspondence Audits

A correspondence audit is conducted entirely through written communication, typically initiated by a letter from the IRS — often a CP2000 notice or a similar document — that identifies a specific discrepancy and requests substantiation or explanation.

Who conducts them. Correspondence audits are generally handled by tax examiners at IRS Service Centers, working through the Automated Underreporter (AUR) program or similar automated functions. The taxpayer typically does not have a single named agent to communicate with. Replies go to a Service Center, where a different reviewer may process each response.

Typical issues. Correspondence audits focus on narrow, well-defined issues that can be resolved through document production:

• Information matching mismatches (a 1099 the IRS received but does not match the return)
• Missing or incorrect Social Security numbers for dependents
• Earned Income Tax Credit eligibility verification
• Education credit substantiation
• Itemized deduction verification on a single category (charitable contributions, medical expenses)
• Simple math errors or credit calculation questions

Scope. Limited and pre-defined. The IRS letter identifies what is being examined and (usually) limits the inquiry to that issue.

Risk profile. Correspondence audits are not low-stakes by default — many produce significant adjustments — but the risk of unbounded expansion is lower than with office or field audits. The greater risk is mishandling: failing to respond by the deadline, responding incompletely, or responding in a way that creates new issues.

When to engage counsel. Most correspondence audits do not require attorney involvement. They can typically be handled by the taxpayer directly or by the return preparer. Counsel is appropriate where the dollar amounts are significant, where the underlying facts touch on potential criminal exposure, or where the correspondence audit appears to be a precursor to a broader examination.

Office Audits

An office audit is conducted in person at an IRS office, typically as a single appointment lasting several hours to a full day. The taxpayer (or representative) brings requested documents to the appointment and meets with the examiner to address specific issues.

Who conducts them. Office audits are generally conducted by Tax Compliance Officers (TCOs), though Revenue Agents may handle some office examinations. Unlike correspondence audits, the taxpayer has a single named examiner with whom communications occur.

Typical issues. Office audits address moderately complex issues that benefit from in-person review:

• Schedule C examinations of self-employed taxpayers
• Schedule E rental property issues
• More complex itemized deduction questions (including travel and entertainment substantiation)
• Multi-year individual return issues
• Credit eligibility questions requiring document review

Scope. Broader than correspondence audits, narrower than field audits. The IRS will typically issue an Information Document Request before the appointment listing the specific documents and issues to be examined.

Risk profile. Office audits carry meaningful risk of expansion. Issues identified during the appointment can lead to follow-up examinations, related-return pickups, or escalation to a field audit if complexity warrants. Statements made during the appointment become part of the examination record.

When to engage counsel. Office audits frequently benefit from representation, particularly where the issues are substantive, the dollar amounts are meaningful, or the taxpayer is uncomfortable with the prospect of in-person examination by a trained IRS employee. CPAs and EAs can represent in office audits; attorneys add the privilege protection and litigation backstop that matter in more complex cases.

Field Audits

A field audit is the most comprehensive type of IRS examination. It is conducted in person at the taxpayer’s place of business, the representative’s office, or another location convenient to the examination, and typically extends over months — sometimes years — rather than days.

Who conducts them. Field audits are conducted by Revenue Agents. The division and specialization of the Revenue Agent reflects the type of case:

• Small Business / Self-Employed (SB/SE) Revenue Agents handle most individual and small-business field audits
• Large Business and International (LB&I) Revenue Agents handle complex corporate, partnership, and high-net-worth examinations
• The Global High Wealth Group within LB&I handles the most specialized examinations of the wealthiest U.S. taxpayers, using an enterprise audit approach that considers entire structures of related entities and transactions

Typical issues. Field audits address the most complex tax issues:

• Multi-year individual and business return examinations
• Partnership and S-corporation issues, including basis disputes and related-party transactions
• High-net-worth taxpayer examinations involving multiple entities and structures
• Cryptocurrency examinations of active traders, NFT participants, and DeFi users — covered in our article on inside an IRS cryptocurrency audit
• Foreign account and offshore disclosure matters
• Allegations of fraud or willful conduct
• Industry-specific examinations conducted as part of LB&I campaigns

Scope. Field audits typically cover one or more complete tax years, with the agent reviewing the return in its entirety rather than focusing on a single issue. Multiple Information Document Requests are issued over the course of the examination, with the scope evolving as issues develop.

Risk profile. Field audits represent the IRS’s most resource-intensive examination type. By the time the IRS opens a field audit, the agency has decided the case is worth investing significant time and analytical resources in. Cases conducted under the Global High Wealth Group’s enterprise approach use multiple specialists and consider the full web of related entities and transactions.

When to engage counsel. Field audits — particularly those conducted by LB&I or the Global High Wealth Group — almost always benefit from experienced tax controversy counsel. The combination of substantive complexity, multi-year scope, specialized examiner training, and significant dollar exposure makes attorney representation the appropriate default. Where there is any potential for criminal exposure or aggressive penalty positions, attorney representation is essential. We covered this calculus in detail in our article on tax attorney vs CPA for IRS audit defense.

Where the Three Types Overlap and Where They Don’t

A few important nuances apply across all three audit types:

The taxpayer’s legal rights are the same in each type. The right to representation, the right to obtain a copy of the audit report, the right to appeal proposed adjustments, the right to challenge a notice of deficiency in U.S. Tax Court — these rights do not vary based on whether the audit is conducted by correspondence, in an office, or in the field.

The substantiation rules are the same. Section 274(d) substantiation requirements for travel and entertainment expenses, basis documentation requirements, charitable contribution substantiation under Section 170 — these requirements apply identically across audit types. The differences are in how and how rigorously they are tested.

Audits can convert from one type to another. A correspondence audit that uncovers complexity can be escalated to an office or field audit. An office audit that surfaces issues outside the original scope can become a field audit. A field audit that develops potential criminal exposure can be referred to IRS Criminal Investigation. Recognizing the signals that an audit is converting type is one of the most valuable defensive insights — and it is precisely the kind of inside-the-IRS perspective that comes from prior IRS service.

How the Type of Audit Shapes Defense Strategy

Defense strategy in any IRS examination begins with correctly identifying the type of audit, the IRS division conducting it, and the specific examiner’s training and authority. From there, several principles apply:

For correspondence audits, the defense priority is responsiveness and accurate document production. Missing the deadline, providing incomplete responses, or volunteering information not requested are the most common errors. Where the issue can be cleanly substantiated, a focused response often produces a no-change closing.

For office audits, the defense priority is preparation. The single in-person appointment is where the audit’s record is largely built. Pre-appointment review of documents, anticipation of likely questions, and preparation of organized exhibits typically determine the outcome. As discussed in our article on how to respond to an IRS IDR, the appointment is not the time for improvisation.

For field audits, the defense priority is methodology. Multi-year, multi-issue examinations require sustained, organized, document-driven defense across months or years. The record built during the field audit is the record that follows the case to Appeals, to U.S. Tax Court, and through any subsequent litigation. This is the type of audit where the inside-the-IRS perspective of a former Revenue Agent — the focus of our article on why a former IRS revenue agent attorney changes audit defense — most directly changes outcomes.

What Each Type Tells You About the IRS’s Interest in the Case

The type of audit the IRS opens carries information about the agency’s view of the case. A correspondence audit signals that the IRS has identified a specific, narrow issue and believes it can be resolved through document production. An office audit signals that the IRS sees enough complexity to warrant in-person review but not enough to justify field resources. A field audit — particularly one conducted by LB&I or the Global High Wealth Group — signals that the IRS believes the case is worth investing significant resources in.

Conversely, the absence of certain audit types can also be informative. A taxpayer whose return contains issues that would normally warrant a field audit, but who receives only a correspondence audit, may be facing a case where the IRS does not yet appreciate the scope. That dynamic creates specific defensive considerations — and is one of the reasons experienced controversy counsel reads each audit’s type, scope, and selection signals carefully before deciding how to respond.

How Kugelman Law Handles Each Audit Type

Kugelman Law’s audit defense practice is calibrated to the type of audit and the complexity of the underlying issues. For correspondence audits with significant exposure or potential complexity, the firm provides focused review and response strategy. For office audits, the firm provides full pre-appointment preparation, representation at the examination, and follow-through. For field audits — particularly those conducted by LB&I or the Global High Wealth Group — the firm provides the sustained, methodology-driven defense that complex multi-year examinations require.

Founder Alex Kugelman brings nearly two decades of federal tax controversy experience, including litigation in U.S. Tax Court and U.S. District Court. Otto Bosch brings the inside-the-IRS perspective from his time as a Revenue Agent in the IRS Global High Wealth Group within LB&I — including direct experience with the examination types and divisional procedures that govern most substantive audits.

Representative outcomes from the firm’s audit defense practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

Frequently Asked Questions

How do I know what type of IRS audit I am facing?

The initial IRS letter identifies the type of audit. A letter asking for documents to be mailed in is a correspondence audit. A letter scheduling an in-person appointment at an IRS office is an office audit. A letter from a Revenue Agent proposing to meet at your place of business or your representative’s office is a field audit. The letter will also identify the examiner’s title (tax examiner, Tax Compliance Officer, Revenue Agent) and the IRS division conducting the examination.

Is a correspondence audit less serious than a field audit?

Generally yes — but not always. Correspondence audits typically involve narrower issues and smaller dollar amounts, but they can produce significant adjustments and can escalate to broader examinations if the response surfaces complexity. The right approach is to take any IRS audit seriously regardless of type.

Can an office audit turn into a field audit?

Yes. Where the issues identified during an office audit prove more complex than expected, or where the scope expands to multiple years or related entities, the IRS can escalate the examination to a field audit. This is one of the reasons preparation for an office audit appointment matters — what surfaces at the appointment shapes whether the case stays narrow or expands.

Do I have to let an IRS Revenue Agent into my home or business?

You generally have the right to conduct an audit at your representative’s office rather than at your home or place of business, particularly when you are represented by an attorney, CPA, or EA. Revenue Agents typically accommodate reasonable location requests where the relevant records can be made available.

Who decides what type of audit will be conducted?

The IRS decides, based on the issues identified at selection, the complexity of the return, and the dollar amounts at stake. Taxpayers generally do not have the ability to elect one type over another, though the choice of representative and the location of the audit can be negotiated in field examinations.

Speak With Kugelman Law

If you have received an IRS audit notice of any type — correspondence, office, or field — schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

About the Author

Alex Kugelman is the founder and managing attorney of Kugelman Law, a boutique tax controversy and cryptocurrency tax firm serving California and clients nationwide. With nearly two decades of federal tax controversy experience — including litigation in the U.S. Tax Court and U.S. District Court — Alex represents individuals and businesses in their most consequential disputes with the IRS and the California Franchise Tax Board. He is a member of the State Bar of California (No. 255463), admitted to the Bar of the U.S. Supreme Court, and served as San Francisco Chair of the Federal Bar Association’s Tax Division in 2018. He is also a member of the Marin County Assessment Appeals Board and a nationally recognized cryptocurrency tax attorney featured on the Bitcoin.tax podcast and The Mark Milton Show. Read Alex’s full bio.

The taxpayer, by contrast, often has incomplete records, CSV exports that do not reconcile cleanly, transactions spread across exchanges that no longer exist, and no clear sense of how to characterize half of the activity on the return.

That asymmetry is what makes crypto tax audit defense different from most other audit defense work. It is also why an inside-the-IRS perspective — knowing what the agent is actually looking at, how they have been trained to develop the case, and where their analytical framework is strongest and weakest — is so consequential to the outcome.

This article explains how Kugelman Law approaches crypto audit defense, with the perspective of attorney Otto Bosch, who served as a Revenue Agent in the IRS Global High Wealth Group within the Large Business and International (LB&I) Division before joining the firm in February 2026, paired with founder Alex Kugelman‘s nationally recognized cryptocurrency tax practice.

For background on what the IRS is doing in this space, see our companion article on inside an IRS cryptocurrency audit.

The Defensive Challenge in a Crypto Audit

Crypto audits combine several characteristics that, in combination, make them uniquely difficult to defend without specialized methodology:

• Volume. Active crypto traders, NFT participants, and DeFi users can have thousands or tens of thousands of transactions across dozens of exchanges and wallets over multi-year periods. The volume alone produces complexity that ordinary audit defense workflows are not designed to handle.
• Recordkeeping gaps. Exchanges shut down. Hot wallets get rolled into cold storage. CSV exports lose detail. Pre-2017 records are often nonexistent. The defense routinely operates with incomplete data that the IRS does not have either — but the burden of substantiation is on the taxpayer.
• Characterization ambiguity. Was that DeFi transaction a taxable event or not? Is the wrapping of a token a disposition? How is a liquidity pool exit characterized? Many crypto issues do not have clear IRS guidance, and the agent and the taxpayer can be looking at the same transactions and reaching different conclusions.
• The IRS’s data advantage. Through John Doe summons data, blockchain analytics partnerships, and broker reporting, the IRS sometimes knows about specific transactions the taxpayer does not remember.
• The Form 1040 digital asset question. A “no” answer on the digital asset question, paired with significant exchange activity, is a finding the agent will use throughout the case — for penalty positions, for willfulness analysis, and (in serious cases) for criminal referral consideration.

Each of these challenges has a defensive response. Together, they require methodology — not improvisation.

Phase One: Pre-Response Case Analysis

The first thing a former IRS agent does on a crypto audit is read the case before doing anything else. That means understanding what the IRS likely knows, what the IRS likely does not know, what the audit’s selection path tells the defense about the agent’s working hypothesis, and what the worst-case scenario looks like if the case develops adversely.

Specifically, the pre-response analysis includes:

• What does the IRS already have? If the audit was triggered by exchange data from a John Doe summons, the IRS has the data. If it was triggered by a Form 1040 digital asset question mismatch, the IRS knows what triggered it. If it was triggered by a related-return pickup, the IRS knows the connection. Reading the selection path is one of the first defensive moves.
• What is the taxpayer’s actual exposure? This requires reconstructing the full activity universe — every exchange, every wallet, every transaction type — and modeling the tax outcome before responding to the first Information Document Request.
• Are there parallel issues? Crypto activity often comes paired with foreign account issues (FBAR, Form 8938), unreported income from mining or staking, NFT royalty income, or other items that may not yet be on the agent’s radar but could become so.
• Is there potential for criminal exposure? Where the digital asset question was answered “no” while material activity existed, where amounts are significant, or where the pattern suggests willfulness, the audit may be — or may become — an eggshell audit. We covered the eggshell defense framework in detail in our article on eggshell audits explained.

The output of this phase is a defensive baseline: a clear picture of the case from both sides of the table before a single document is produced.

Phase Two: Reconstruction and Substantiation

Most crypto audits ultimately turn on reconstruction. The defense’s job is to produce a defensible record of activity, basis, and income — and to do so in a way that the agent’s blockchain analytics tools will validate rather than contradict.

Key elements of the reconstruction work:

• Exchange data consolidation. Pulling CSV exports, transaction histories, and tax reports from every exchange the taxpayer used, then reconciling across them to identify overlaps, gaps, and inconsistencies.
• Self-custody wallet tracing. Identifying every self-custody wallet, public address, and on-chain transaction. Where wallets are linked through transfers, the defense’s reconstruction has to match what blockchain analytics will show.
• Basis methodology selection. FIFO, LIFO, specific identification, average cost — the choice of basis methodology has real tax consequences and has to be applied consistently. Where prior years used one methodology and the audit year uses another, the inconsistency becomes a defense issue.
• Income item reconstruction. Mining rewards, staking rewards, airdrops, hard forks, and DeFi income items each have specific rules and require contemporaneous fair market value determinations.
• NFT-specific reconstruction. Mint cost, gas fees, royalty income, and marketplace fees — NFT activity requires its own analytical layer.
• Foreign exchange identification. Activity on offshore exchanges triggers FBAR and Form 8938 considerations that must be developed in parallel with the income tax analysis.

The objective of the reconstruction is not to produce a document that satisfies the agent. The objective is to produce a record that withstands the agent’s verification, the appeals officer’s later review, and (if necessary) the U.S. Tax Court’s examination of the workpapers.

Phase Three: Document Strategy and IDR Response

Once the case has been read and the reconstruction is in hand, the defense engages with the IRS’s Information Document Requests. As we covered in detail in our article on how to respond to an IRS IDR, IDR responses are not paperwork exercises — they are deliberate, strategic communications that frame the audit’s record.

In crypto audits, the IDR response strategy involves several specific considerations:

• Scope clarification on broad requests. The opening IDR in a crypto audit is often written broadly. “All cryptocurrency transactions for tax years 20XX through 20XX” is the kind of request that can almost always be narrowed through respectful negotiation.
• Producing reconstructions rather than raw data. Where appropriate, providing the agent with a clean, reconciled summary of activity — with the underlying data available on request — produces a better record than dumping raw CSV files the agent has to interpret.
• Privilege review of advisor communications. Communications with tax preparers, accountants, and prior counsel about crypto positions may be privileged and should be reviewed before production.
• The disclosure analysis. Information about wallets or exchanges the IRS does not appear to know about is the single most consequential disclosure decision in any crypto audit. That decision should never be made without legal analysis.
• Reconciling with what the IRS likely already has. Where the defense’s reconstruction differs from what the IRS will see in its own data, those gaps need to be explained — not ignored.

Phase Four: Engaging With the Agent’s Blockchain Analytics

One of the more sophisticated aspects of crypto audit defense is engaging substantively with the blockchain analytics the IRS uses. Agents in crypto examinations are often working with output from tools like Chainalysis, and the analytics produces conclusions the defense will eventually need to address.

The defense’s role here includes:

• Understanding what the analytics actually shows and what it does not. Analytics tools attribute wallets to identified taxpayers with varying degrees of confidence. Some attributions are airtight. Others rest on inference. Knowing which is which matters.
• Identifying analytic errors. Misattributed wallets, transactions that the analytics counts twice, transfers between the taxpayer’s own wallets that should not be treated as dispositions — these are common analytic errors that can move large numbers.
• Producing counter-reconstructions. Where the defense’s reconstruction differs from the IRS’s analytics output, the difference needs to be explained with documentation.

Inside-the-IRS experience matters here. Agents have specific training on how to use these tools, and counsel who has been inside the IRS recognizes both the tools’ strengths and their characteristic failure modes.

Phase Five: Negotiating Crypto-Specific Positions

Crypto audits frequently involve issues where the law is unsettled, where IRS guidance is ambiguous, or where the agent’s position is technically defensible but practically negotiable. The defense’s job is to identify these positions early and to negotiate them on terms favorable to the taxpayer.

Common negotiation points in crypto audits include:

• Basis methodology disputes. Where the agent is treating undocumented basis as zero, the defense may be able to negotiate a reasonable basis position with appropriate substantiation.
• Characterization questions. Whether a particular transaction is a taxable disposition, a like-kind exchange (for pre-2018 trades), a borrowing rather than a sale, or something else — these characterization questions are often negotiable.
• Penalty mitigation. Accuracy-related penalties under Section 6662 are not automatic. Reasonable cause defenses, reliance on tax software output, reliance on professional advice, and other mitigating facts can reduce or eliminate penalty exposure.
• Willfulness defenses. Where FBAR issues are in play, the willfulness analysis drives penalty exposure significantly. A defensible non-willful posture can move outcomes by orders of magnitude.

Phase Six: The Escalation Path

Most crypto audits should be resolved at the examination level when possible. But the defense’s posture should always be calibrated to the possibility that the case escalates — to Appeals, to U.S. Tax Court, or, in the most serious matters, to a voluntary disclosure pathway.

The escalation analysis includes:

• Settlement leverage. What is the realistic best and worst case at the agent level versus at Appeals? Where Appeals would likely produce a better outcome, the defense’s posture at the examination level shifts.
• Litigation readiness. If the case proceeds to U.S. Tax Court, the record built during the examination is what the case is decided on. The defense’s IDR responses, written communications, and document production should be calibrated accordingly from day one.
• Voluntary disclosure as a parallel option. For the most serious cases involving significant unreported activity, false answers to the digital asset question, or undisclosed offshore exchange use, the IRS Voluntary Disclosure Practice may be the strategically correct path. The decision to pursue VDP is consequential and time-sensitive — generally available only before IRS discovery.

For foreign-exchange-related issues, streamlined offshore procedures, delinquent FBAR procedures, and delinquent foreign information return procedures provide alternative pathways depending on willfulness.

How Kugelman Law’s Combined Capability Shapes the Defense

Kugelman Law is structured deliberately for crypto controversy work. Alex Kugelman has been featured nationally on the Bitcoin.tax podcast and The Mark Milton Show discussing IRS digital asset enforcement, and has built one of the country’s earliest dedicated cryptocurrency tax practices through the firm’s cryptocurrency accounting and audits service. Otto Bosch brings the inside-the-IRS perspective from his time as a Revenue Agent in the LB&I Global High Wealth Group.

The combination is the point. Crypto fluency without IRS-insider perspective leaves the defense reading blind on the agent’s posture and the IRS’s internal calculus. IRS-insider perspective without crypto fluency leaves the defense unable to engage the technical issues that drive the case. Both are necessary. Few firms in the country offer both under one roof. For an extended discussion of how that combined capability shapes audit defense, see our article on why a former IRS revenue agent attorney changes audit defense.

Representative outcomes from the firm’s controversy practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

Frequently Asked Questions

What makes a crypto tax audit different from a regular tax audit?

Crypto tax audits involve transaction volumes, recordkeeping gaps, characterization ambiguities, and an asymmetric data environment that are uncommon in other types of audits. The IRS has built specific enforcement infrastructure for digital asset cases — including blockchain analytics, John Doe summons data, and dedicated training — and the defense methodology has to be calibrated accordingly.

Can I defend a crypto audit using my regular accountant?

For straightforward documentation-focused crypto matters, sometimes. For substantive crypto audits — particularly those involving significant amounts, multi-year activity, foreign exchange use, or any potential criminal exposure — attorney representation with crypto-specific experience is generally appropriate. The privilege protection, technical specialization, and litigation backstop matter in this space.

What is the most common issue in a crypto audit?

Unreported dispositions and undocumented basis are the two largest single issues in most crypto audits. Mining, staking, airdrop, and hard fork income items are also routinely under-reported. NFT-specific issues, DeFi characterization questions, and foreign exchange use round out the most common categories.

How does the IRS know about my crypto wallets?

The IRS has access to exchange data produced through John Doe summonses (Coinbase, Kraken, Circle, and others), expanded broker reporting under digital asset rules, blockchain analytics tools that trace transactions across wallet addresses, intergovernmental information exchange agreements for foreign-domiciled exchanges, and a growing array of other data sources. Self-custody wallets are not invisible to the IRS, and the assumption that they are has produced significant exposure for taxpayers who relied on it.

Should I amend my returns before the IRS opens an audit?

Sometimes — but the answer depends heavily on the facts. Amending returns can be the right approach in some cases and exactly the wrong approach in others, particularly where there is potential criminal exposure or where the taxpayer is already under examination. The decision should be made with experienced controversy counsel, not unilaterally.

Speak With Kugelman Law

If you are facing an IRS cryptocurrency audit, have received an IRS notice involving digital assets, or are weighing how to resolve crypto tax compliance issues before they reach an examination, schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

About the Author

Alex Kugelman is the founder and managing attorney of Kugelman Law, a boutique tax controversy and cryptocurrency tax firm serving California and clients nationwide. With nearly two decades of federal tax controversy experience — including litigation in the U.S. Tax Court and U.S. District Court — Alex represents individuals and businesses in their most consequential disputes with the IRS and the California Franchise Tax Board. He is a member of the State Bar of California (No. 255463), admitted to the Bar of the U.S. Supreme Court, and served as San Francisco Chair of the Federal Bar Association’s Tax Division in 2018. He is also a member of the Marin County Assessment Appeals Board and a nationally recognized cryptocurrency tax attorney featured on the Bitcoin.tax podcast and The Mark Milton Show. Read Alex’s full bio.

Some audits are something else entirely.

An eggshell audit is a civil IRS examination that has, or could have, criminal implications. The label captures the central problem: every step the taxpayer or their representative takes during the audit is taken on ground that could crack, transforming a civil dispute into a criminal investigation.

Statements made to the agent can become evidence. Documents produced can become exhibits. A misjudgment on the wrong issue can mean the difference between a tax assessment and a federal prosecution.

This article explains what an eggshell audit is, why it requires a fundamentally different defense posture than a routine examination, and what taxpayers should understand if they have any reason to believe their audit may be or may become one.

The perspective is informed by Kugelman Law attorney Otto Bosch, who served as a Revenue Agent in the IRS Global High Wealth Group within the Large Business and International (LB&I) Division before joining the firm in February 2026, paired with founder Alex Kugelman‘s nearly two decades of federal tax controversy experience including U.S. Tax Court and U.S. District Court litigation.

Important note: This article is general legal information, not legal advice. If you have reason to believe your audit may involve criminal exposure, you should retain an experienced tax controversy attorney before making any further communication with the IRS.

What Is an Eggshell Audit?

An eggshell audit is the term tax controversy practitioners use to describe a civil IRS examination in which the taxpayer (or their representative, or both) has reason to believe that material elements of the return — or the underlying facts — could expose the taxpayer to civil fraud penalties or criminal prosecution if the IRS develops them.

The “eggshell” metaphor is apt. The audit appears civil, the Revenue Agent is operating under civil procedures, and the surface posture is administrative. But the situation is fragile in a way the agent may not yet appreciate, and a wrong step by the taxpayer — particularly a false statement, a misleading explanation, or an inadvertent disclosure — can crack open exposure that was previously contained.

Eggshell audits are not rare in absolute terms, but they are uncommon as a percentage of all audits. They tend to arise from specific underlying fact patterns: significant unreported income, undisclosed foreign accounts, cryptocurrency activity inconsistent with reported income, falsified records, or statements to the IRS that cannot be reconciled with the underlying facts. In each case, the civil examination is the proximate event, but the criminal exposure is the deeper concern.

Eggshell vs. Reverse-Eggshell Audits

Practitioners distinguish two related but different scenarios:

Eggshell audit. A civil IRS examination in which the taxpayer (and counsel) know about potential criminal exposure, but the civil Revenue Agent does not. The defense’s strategic concern is to avoid taking steps during the civil audit that would educate the agent about the criminal facts.

Reverse-eggshell audit. A civil examination in which the Revenue Agent has signals or actual knowledge of potential criminal exposure but continues operating under civil procedures. This scenario is more dangerous because the agent’s questions, document requests, and approach are likely calibrated to develop the criminal evidence while preserving the civil posture. Recognizing a reverse-eggshell audit early is one of the most important things a defense team can do.

The defense strategy in each scenario is different, and both require the kind of inside-the-IRS perspective that allows counsel to read the agent’s posture accurately.

How Eggshell Audits Typically Arise

The fact patterns that produce eggshell audits cluster around specific issue categories:

• Significant unreported income. Bank deposits that exceed reported gross income by margins that cannot be explained by transfers, gifts, or loans. Side businesses that were not reported. Cash receipts that were not deposited. Income from sources the taxpayer hoped the IRS would not discover.
• Undisclosed foreign accounts. Failure to file FBAR (FinCEN Form 114) or Form 8938 over multiple years, particularly where the account balances are substantial and the failure appears willful rather than inadvertent.
• Cryptocurrency activity inconsistent with reported income. A “no” answer to the Form 1040 digital asset question paired with significant exchange activity now visible to the IRS through John Doe summons data, blockchain analytics, or expanded broker reporting. See our article on inside an IRS cryptocurrency audit for the broader enforcement context.
• Falsified records or fabricated deductions. Invoices for expenses that did not occur. Mileage logs created after the fact for trips that did not happen. Charitable contributions claimed for property never donated. Substantiation that does not survive even cursory scrutiny.
• False statements to the IRS. Statements made to a Revenue Agent during an interview that are inconsistent with the documents, with the return, or with the underlying facts.
• Patterns of conduct suggesting a course of evasion. Where multiple years show consistent patterns of underreporting or non-filing rather than isolated errors, the case takes on a different character.

The presence of one of these fact patterns does not necessarily mean an audit is — or will become — an eggshell audit. Most are addressed through civil resolution. But the presence of any of them changes the risk profile of the examination.

Why Eggshell Audits Are So Dangerous

Three structural features of the U.S. tax system make eggshell audits uniquely dangerous compared to other tax matters.

Civil statements and documents become criminal evidence. Anything the taxpayer says to a Revenue Agent — and anything the taxpayer produces in response to an IDR — can be used in a subsequent criminal prosecution. There is no separation between the civil and criminal records. A false statement during a civil audit becomes obstruction-adjacent in a criminal case.

The statute of limitations is unlimited for fraud. The standard three-year statute of limitations on assessment, and the six-year statute for substantial omissions, do not apply to fraudulent returns. A civil examination that develops fraud allegations can reach back many years — and a criminal investigation that develops a willful evasion charge faces no time limit at all in some scenarios.

Penalties are catastrophic. Civil fraud carries a 75 percent penalty on the underpayment. Criminal tax evasion under Section 7201 is a felony with potential imprisonment of up to five years and substantial fines, in addition to the underlying tax, interest, and civil fraud penalty. Willful failure to file under Section 7203 is a misdemeanor. Filing a false return under Section 7206 is a felony. The penalty stacking on a serious case can exceed the original tax exposure by many multiples.

Signs Your Audit May Be (or May Become) an Eggshell Audit

Recognizing the signs of an audit that has shifted — or is shifting — toward a criminal posture is one of the most consequential defensive skills in controversy practice. Indicators include:

• Agent questions that focus on knowledge, intent, and willfulness. “When did you become aware of…?” “Why didn’t you report…?” “Who advised you about…?” These are not documentation questions. They are intent-development questions.
• Specific document requests focused on the fraud elements. Requests for items that would not be relevant in a routine civil audit — communications with advisors about the disputed positions, records of when transactions were undertaken, drafts of returns before final filing.
• Specialist involvement. Appearance of fraud technical advisors, fraud enforcement advisors, or IRS Criminal Investigation (IRS-CI) personnel — even informally — is a significant signal.
• Sudden agent silence. A Revenue Agent who was actively engaged on a case and then becomes unresponsive, particularly after a significant disclosure, may have made a referral.
• Patterns of questioning that anticipate prosecutorial elements. Questions structured around the elements of tax evasion (additional tax due, willfulness, affirmative act of evasion) rather than around the elements of a civil adjustment.
• Reluctance to discuss the case substantively. Agents in reverse-eggshell scenarios are often trained to maintain a civil posture without committing to civil resolution.

None of these signals is dispositive on its own. The combination, and the pattern over time, is what matters. Counsel who has worked inside the IRS recognizes these signals more reliably than counsel who has only worked across the table.

Common Mistakes in Eggshell Audits

The most consequential errors in eggshell audits tend to cluster around the same patterns:

• Sitting for an unrepresented interview. Statements made in an interview to a Revenue Agent become part of the permanent record. Statements made to a special agent become potential exhibits in a criminal prosecution. Interviews without counsel are nearly always a mistake in any case with potential criminal exposure.
• Producing documents without privilege review. Documents responsive to an IDR may include attorney communications, advisor analyses, or work product that should be withheld under privilege. Production without review waives protections that cannot be recovered.
• Volunteering explanations to “look cooperative.” Cooperation is a virtue in routine civil audits. In eggshell audits, every explanation that touches on knowledge, intent, or motive creates risk. The difference between productive cooperation and self-incriminating explanation is exactly the kind of judgment experienced controversy counsel provides.
• Making false or misleading statements to the agent. False statements to a federal officer are a separate criminal offense under 18 U.S.C. Section 1001, independent of any underlying tax crime. Once made, they are difficult to unmake.
• Attempting to “explain away” prior misstatements. Doubling down on a prior false statement compounds the exposure rather than mitigating it.
• Choosing the wrong professional. As we discussed in our article on tax attorney versus CPA for IRS audit defense, CPA representation does not provide attorney-client privilege protection. In matters with potential criminal exposure, attorney representation is not a preference. It is the only structurally appropriate choice.

How an Eggshell Audit Defense Is Different

Defending an eggshell audit is fundamentally different from defending a routine examination. Several principles structure the defense:

Privilege is the foundation. Every communication about the case must be handled within the attorney-client privilege framework, and work product must be developed and maintained accordingly. Where accountants need to be involved (for technical reconstruction, return preparation, or financial analysis), they should typically be engaged through a Kovel arrangement that brings them within the attorney’s privilege.

Communications run through counsel only. Taxpayers do not communicate directly with the agent. Counsel manages all written and verbal communication, with the taxpayer’s role limited to providing facts to counsel within the privilege.

Document production is reviewed before delivery. Every document responsive to an IDR is reviewed for privilege, for content that would educate the agent about criminal facts, and for context that may need to be addressed. Production is deliberate, not reflexive. See our article on how to respond to an IRS IDR for the underlying framework.

Fifth Amendment considerations are evaluated case-by-case. In matters with sufficient criminal exposure, the Fifth Amendment privilege against self-incrimination may apply to particular questions, particular documents, or in some cases the entire examination. The decision to invoke the Fifth Amendment is significant — it can signal criminal exposure to the agent — but in some cases it is the appropriate protection.

Voluntary disclosure is evaluated as a strategic option. Where the facts warrant, the IRS Voluntary Disclosure Practice (VDP) can be a path to resolving criminal exposure on relatively defined terms — but it is only available before the IRS has discovered the noncompliance, and the criteria are specific.

Voluntary Disclosure as a Strategic Tool

The IRS Voluntary Disclosure Practice is the formal pathway through which taxpayers can come forward and disclose past noncompliance in exchange for the IRS’s commitment not to recommend criminal prosecution (subject to specific conditions and case-by-case determination).

Key features of the practice:

• The disclosure must be timely — generally made before the IRS has notified the taxpayer of a civil examination or criminal investigation, and before the IRS has otherwise received information from a third party about the noncompliance.
• The disclosure must be truthful, complete, and cooperative.
• The taxpayer must be prepared to pay the tax, interest, and applicable penalties.
• The disclosure does not provide absolute immunity from prosecution — it is a recommendation against prosecution, not a guarantee.

VDP is not the right path in every eggshell scenario. For matters involving foreign accounts where willfulness can be defended as non-willful, streamlined offshore procedures may produce a better outcome with substantially reduced penalties. For matters where the IRS has already opened an examination, VDP may not be available at all. The choice among voluntary disclosure pathways is one of the most consequential decisions in eggshell defense and requires careful legal analysis of the specific facts.

For taxpayers considering offshore disclosure, our service pages on streamlined offshore procedures, delinquent FBAR procedures, and delinquent foreign information return procedures provide additional context on the relevant pathways.

How Kugelman Law Handles Eggshell Audits

Kugelman Law approaches every audit defense matter with attention to the criminal dimensions that may be present even when the surface posture is civil. The firm’s combination of capabilities — Otto Bosch’s inside-the-IRS background as a former Revenue Agent in the Global High Wealth Group, and Alex Kugelman’s nearly two decades of federal tax controversy and litigation experience — is calibrated specifically for the kinds of cases where reading the IRS’s posture correctly is the difference between a manageable matter and a catastrophic one.

The firm’s audit defense practice is structured around the principle that the early stages of an examination are the most consequential. Decisions made in responding to the first IDR, in handling the opening conference, in giving or not giving interviews, and in producing or not producing documents shape the case in ways that cannot be undone later. Where the case has potential eggshell characteristics, that principle becomes paramount.

Representative outcomes from the firm’s controversy practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

Frequently Asked Questions

What is the difference between an audit and a criminal investigation?

A civil audit is conducted by Revenue Agents under civil procedures to develop and assess tax adjustments. A criminal tax investigation is conducted by Special Agents within IRS Criminal Investigation (IRS-CI) under criminal procedures to develop evidence for potential prosecution. The two processes can overlap — particularly in reverse-eggshell scenarios — but they are governed by different rules and present different risks.

Should I tell the Revenue Agent about other issues they haven’t asked about?

Almost never. Volunteering information not requested in an IDR is one of the most common and most expensive mistakes in any audit, and the consequences are particularly severe where the volunteered information has criminal implications. Decisions about disclosure should be made with experienced controversy counsel.

Can I be prosecuted for an honest mistake on my tax return?

Honest mistakes — including significant ones — are generally not criminal. Criminal tax violations require willfulness: a voluntary, intentional violation of a known legal duty. Negligent or careless errors, even when they result in substantial underpayment, are typically civil matters. The line between negligence and willfulness is fact-intensive and is one of the central battlegrounds in eggshell defense.

What is the IRS Voluntary Disclosure Practice?

The IRS Voluntary Disclosure Practice (VDP) is a formal program through which taxpayers can disclose past noncompliance in exchange for the IRS’s recommendation against criminal prosecution. The disclosure must be timely (before IRS discovery), truthful, complete, and cooperative, and the taxpayer must pay the tax, interest, and applicable penalties. VDP is one of several voluntary disclosure pathways, and the choice among them is consequential and fact-specific.

Do I need a different attorney for an eggshell audit than for a routine audit?

The attorney for a serious audit and the attorney for an eggshell audit should have the same core skills: federal tax controversy experience, attorney-client privilege protection, and the ability to litigate if necessary. What changes in eggshell scenarios is the standard of care — every decision is weighted by the criminal implications, and the margin for error is narrow. Attorneys with significant eggshell experience are typically better positioned to defend these matters.

Speak With Kugelman Law

If you have reason to believe your IRS audit may involve criminal implications — or if you are weighing whether voluntary disclosure is appropriate for past noncompliance — schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

About the Author

Alex Kugelman is the founder and managing attorney of Kugelman Law, a boutique tax controversy and cryptocurrency tax firm serving California and clients nationwide. With nearly two decades of federal tax controversy experience — including litigation in the U.S. Tax Court and U.S. District Court — Alex represents individuals and businesses in their most consequential disputes with the IRS and the California Franchise Tax Board. He is a member of the State Bar of California (No. 255463), admitted to the Bar of the U.S. Supreme Court, and served as San Francisco Chair of the Federal Bar Association’s Tax Division in 2018. He is also a member of the Marin County Assessment Appeals Board and a nationally recognized cryptocurrency tax attorney featured on the Bitcoin.tax podcast and The Mark Milton Show. Read Alex’s full bio.

For taxpayers who have just received an IDR, the temptation is to treat it as a routine paperwork exercise: gather the documents the form asks for, attach them in a folder, and send them in.

That is exactly the approach experienced Revenue Agents are trained to capitalize on. A response built around what was literally asked, without strategic consideration of what should and should not be produced, frames the rest of the audit on the IRS’s terms.

This article walks through how to respond to an IRS IDR from the inside, with the insider perspective of Kugelman Law attorney Otto Bosch, who served as a Revenue Agent in the IRS Global High Wealth Group within the Large Business and International (LB&I) Division before joining the firm in February 2026.

For background on how Revenue Agents think and operate more broadly, see our companion pieces on what an IRS Revenue Agent does and inside the IRS audit playbook.

What an IRS Information Document Request (IDR) Actually Is

The IDR is a formal document — typically issued on Form 4564 — that the IRS uses during an examination to request specific records and information from a taxpayer. It is not a discovery request in the legal sense, and it is not an interview. It is a written demand for documents and information that the agent will use to develop the case.

Several characteristics distinguish the IDR from other IRS correspondence:

• It is case-specific — directed at a particular taxpayer in connection with a particular examination, not a generic compliance notice.
• It is iterative — almost every audit involves multiple IDRs, with each one shaped by the responses to those that came before.
• It typically includes a deadline by which the response is expected, though deadlines are often negotiable.
• The response forms part of the administrative record that follows the case through any subsequent appeal or litigation.

The IDR is not a subpoena. The IRS cannot compel a response to an IDR in the same way it can compel a response to an administrative summons. However, ignoring or stonewalling an IDR has consequences — including the IRS’s ability to issue a summons, expand the audit, or assess based on the information the IRS already has (which is often unfavorable to the taxpayer).

Why the First IDR Is the Most Consequential Document in Your Audit

From the agent’s perspective, the first IDR is the tool for confirming or refuting the working hypothesis they formed during pre-contact review. From the taxpayer’s perspective, it is the moment when the audit’s scope, tone, and trajectory are set.

Three reasons the first IDR carries outsized weight:

It defines the initial scope of the examination. The issues the agent asks about in the first IDR are the issues the agent expects to develop. The documents produced (and not produced) become the factual record against which adjustments will be measured.

It frames every subsequent IDR. Each IDR after the first is shaped by what the prior response did and did not contain. The agent is not asking the same questions again — they are using each response to refine the next request and develop deeper issues.

It signals to the agent how sophisticated the taxpayer is. A well-organized, complete, and strategically scoped response signals a represented taxpayer who understands the process. A disorganized or over-broad response signals a taxpayer who is likely to make further mistakes as the audit deepens. Both signals affect how aggressively the agent invests in the case.

How a Revenue Agent Reads Your IDR Response

When an experienced Revenue Agent receives an IDR response, they are looking for far more than the literal documents requested. They are reading the response for signals about the case, the taxpayer, and the recordkeeping behind the return.

Specifically, agents are trained to evaluate:

• What was produced. Are the documents responsive to the request? Are they complete? Are they originals or photocopies? Are they organized?
• What was conspicuously absent. Documents the agent expected to see but did not. Categories of records that should exist but were not produced.
• What the production reveals about the taxpayer’s recordkeeping. Contemporaneous records signal a sophisticated taxpayer with strong defensive positions. Reconstructed records — easily identified by tone, format, and consistency — signal the opposite.
• What was volunteered. Documents and information produced that were not requested. These are often more revealing than the requested production.

The response, in other words, is a document the agent reads with the same care a litigator reads a deposition transcript. Treating it casually is a mistake that compounds throughout the audit.

Six Strategic Considerations Before You Respond

A well-handled IDR response is the product of deliberate analysis, not document collection. The strategic considerations below are the kinds of judgments that experienced controversy counsel apply to every IDR they handle.

1. Scope review — what was actually asked

The first task is to read the IDR carefully and identify exactly what the agent is requesting. IDRs are often written broadly, and broad requests can be narrowed through respectful clarification. A request for “all documents related to your business” is not the same as a request for “general ledgers, bank statements, and invoices for tax year 2024.” Where the request is broader than the agent likely intends, a clarifying conversation can produce a more targeted scope.

2. Document gathering — what exists versus what would need to be reconstructed

The next task is to identify which responsive documents exist contemporaneously and which would need to be created, reconstructed, or summarized. Contemporaneous documents are far stronger evidentially than anything created during the audit. Where contemporaneous documents do not exist, the question becomes whether reconstruction is appropriate and how to present it honestly. This judgment matters because, as covered in our article on what IRS auditors look for, agents are trained to recognize reconstruction.

3. Privilege review — what should be withheld

Some categories of documents may be protected by attorney-client privilege, attorney work product, or the limited federally authorized tax practitioner privilege under Section 7525. Privileged documents should be withheld, with a privilege log identifying the categories withheld. This requires legal analysis. We discuss the privilege landscape in detail in our article on tax attorney versus CPA for IRS audit defense.

4. Disclosure analysis — what not to volunteer

Producing more than was asked for is almost never a good idea. It creates work for the agent, raises new issues the agent had not yet developed, and signals to the agent that the taxpayer is unrepresented or insufficiently represented. Documents not responsive to the IDR should not be produced.

5. Format and delivery — building a clean paper trail

How documents are produced matters. Numbered exhibits with a transmittal letter, a clear index, and Bates-stamped pages produce a record that is easy to defend later. Loose documents in a folder produce a record that is hard to defend later.

6. Timing — deadlines and extensions

IDR deadlines are deadlines, but they are also negotiable in most circumstances. A request for an extension, made in good faith and accompanied by a substantive update on the response status, is routinely granted. Missing a deadline without communication signals problems and invites the agent to expand the audit. Communication is the right default.

Common Mistakes Taxpayers Make on IDR Responses

The pattern of mistakes on IDR responses is consistent enough that experienced controversy counsel recognize the signs from the first conversation. The most common errors:

• Over-producing. Sending the agent everything in the file, on the theory that more cooperation is better cooperation. In practice, this expands the audit’s scope and surfaces issues the agent had not yet identified.
• Improvising during follow-up calls. After producing documents, the taxpayer takes a call from the agent and answers questions on the fly. Statements made during these calls become part of the record and can contradict the documents.
• Reconstructing records that look reconstructed. Mileage logs typed up after the audit notice. Expense substantiation created with consistent formatting and identical handwriting. Agents are trained to identify these and discount them accordingly.
• Missing deadlines without extension requests. Letting a deadline pass signals lack of representation and lack of organization. It also invites the agent to assume the worst about the missing documents.
• Volunteering documents and explanations not requested. Often the most expensive single mistake. Documents not asked for that contain unfavorable information will be developed; documents not asked for that contain favorable information are usually less useful than the taxpayer expects.
• Letting an unrepresented preparer handle the response. Return preparers often have the right documents but not the strategic perspective on how to produce them. Many of the worst IDR responses come from competent preparers operating in good faith without controversy experience.

When You Need an Attorney for the IDR Response

Not every IDR requires attorney involvement. A correspondence audit asking for a missing 1099 can generally be handled by the preparer or even directly by the taxpayer. But the moment any of the following becomes true, attorney representation should be retained before the response is sent:

• The dollar amounts in dispute are significant
• The technical issues are complex — partnership, S-corporation, basis, related-party
• Foreign accounts or cryptocurrency are involved
• The taxpayer has any reason to suspect criminal exposure (eggshell audit)
• The audit is being conducted by LB&I, the Global High Wealth Group, or another specialized examination unit
• The IRS has indicated it may pursue aggressive penalties, including civil fraud

Attorneys also have a tool that CPAs and EAs do not: attorney-client privilege over the strategic analysis behind the response. The privilege protection alone is worth attorney involvement in any case with potential criminal implications.

What Happens After You Respond — The Second IDR

For most substantive examinations, the second IDR is where the audit’s actual depth becomes visible. The first IDR was the agent’s tool for confirming the pre-contact hypothesis. The second IDR is where the agent develops the specific issues that the first IDR’s response either raised or failed to put to rest.

Several things can be read from the second IDR:

• Narrower scope. If the second IDR focuses on a specific issue, the agent has probably set the rest of the case aside.
• Broader scope. If the second IDR expands beyond the original areas, the agent’s hypothesis has shifted — usually because something in the first response opened new issues.
• Pivot to legal questions. If the second IDR starts asking about the taxpayer’s knowledge, intent, or interpretation of legal positions, the audit is moving from documentation to characterization — and potentially toward an eggshell posture.
• Specialist involvement. Requests for information that look outside the original agent’s expertise suggest a specialist has been brought in.

Recognizing these signals reliably requires controversy experience.

How Kugelman Law Handles IDR Responses

Kugelman Law approaches every IDR response with two parallel perspectives. Otto Bosch’s background as a former Revenue Agent in the IRS Global High Wealth Group provides the insider’s view on how the agent will read the response. Alex Kugelman‘s nearly two decades of federal tax controversy experience — including U.S. Tax Court and U.S. District Court litigation — provides the strategic perspective on how the record being built today will perform if the case goes to Appeals or trial.

The result is an IDR response process that is calibrated not only to the immediate examination but to the full possible escalation path. Documents are produced in a format that defends the case at every subsequent stage. Privilege is asserted where appropriate and documented through a clean privilege log. Disclosures are deliberate. Communications are written in language that holds up under later review. And the second IDR — when it arrives — meets a defense that is already prepared for it.

For more on how Kugelman Law’s combination of capabilities shapes audit defense, see our article on why a former IRS revenue agent attorney changes audit defense. Representative outcomes from the firm’s audit defense practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

Frequently Asked Questions

What is Form 4564?

Form 4564 is the IRS form used to issue an Information Document Request during an examination. It identifies the documents and information the Revenue Agent is requesting, the deadline for response, and the agent’s contact information. Most IDRs are issued on Form 4564.

Do I have to respond to an IRS IDR?

The IDR itself is not legally enforceable in the way an administrative summons is, but failing to respond has practical consequences — including expanded examination scope, IRS summons authority, and assessments based on the unfavorable information the IRS already has. In nearly all circumstances, responding to the IDR (or negotiating its scope) is the right approach.

How long do I have to respond to an IRS IDR?

IDRs typically include a deadline of two to four weeks, but deadlines are negotiable in most circumstances. A request for an extension made in good faith, with a substantive update on the status of the response, is routinely granted. Communication with the agent about timing is almost always preferable to silence.

What if I cannot produce all the documents the IDR requests?

Missing documents are common in audits and are not necessarily fatal to the defense. The response should clearly identify what is being produced, what is unavailable and why, and what is being reconstructed. Where reconstruction is appropriate, it should be done honestly and clearly labeled as reconstruction. Hiding gaps is far more damaging than identifying them.

Should my CPA respond to the IDR?

Often a CPA can prepare the documents that go into an IDR response, but the strategic decisions about scope, privilege, disclosure, and presentation are legal decisions. For substantive examinations, the right structure is generally attorney-led representation with CPA support — sometimes through a Kovel arrangement that brings the CPA within the attorney’s privilege.

Speak With Kugelman Law

If you have received an IRS Information Document Request — or are anticipating one — schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

About the Author

Alex Kugelman is the founder and managing attorney of Kugelman Law, a boutique tax controversy and cryptocurrency tax firm serving California and clients nationwide. With nearly two decades of federal tax controversy experience — including litigation in the U.S. Tax Court and U.S. District Court — Alex represents individuals and businesses in their most consequential disputes with the IRS and the California Franchise Tax Board. He is a member of the State Bar of California (No. 255463), admitted to the Bar of the U.S. Supreme Court, and served as San Francisco Chair of the Federal Bar Association’s Tax Division in 2018. He is also a member of the Marin County Assessment Appeals Board and a nationally recognized cryptocurrency tax attorney featured on the Bitcoin.tax podcast and The Mark Milton Show. Read Alex’s full bio.

When an IRS Revenue Agent opens an examination, they are not approaching your return with an open mind looking for whatever happens to come up. They are approaching it with a defined set of issue categories they have been trained to develop, supported by analytical techniques the IRS teaches in formal examination training. Knowing what IRS auditors look for — and the specific techniques agents use to develop each issue — is the difference between a defense that anticipates the audit and a defense that scrambles to react to it.

This article walks through the five issue categories that drive the majority of substantive IRS examinations, with the insider perspective of Kugelman Law attorney Otto Bosch, who served as a Revenue Agent in the IRS Global High Wealth Group within the Large Business and International (LB&I) Division before joining the firm. For broader background on how Revenue Agents think and operate, see our companion articles on what an IRS Revenue Agent does and inside the IRS audit playbook.

1. Unreported Income

Unreported income is the single largest category of examination adjustments year after year, and it is the issue Revenue Agents are most rigorously trained to develop. The reason is simple — every dollar of unreported income flows directly through to additional tax, accuracy-related penalties, and (in serious cases) civil fraud penalties or criminal referral. The dollar leverage on this category is the highest of any audit issue.

Agents are trained to use multiple analytical techniques to identify unreported income:

• Third-party matching. W-2s, 1099s, K-1s, broker statements, gambling winnings, foreign account disclosures, cryptocurrency exchange reports, and a growing array of other information returns are matched against filed returns. Mismatches generate examinations.
• Bank deposit analysis. Total bank deposits across all accounts (personal and business) are compared to reported gross income. Significant gaps that cannot be explained by transfers, loans, gifts, or other non-taxable sources become potential unreported income.
• Net worth analysis. Increases in the taxpayer’s net worth across years, plus personal living expenses, are compared to reported income. The basic equation: if a taxpayer accumulated $300,000 in net worth in a year while reporting $100,000 in income and spending $80,000 on living expenses, the math does not work — and the agent will pursue the gap.
• Specific item examination. The agent identifies a specific potential income source — a side business, a property sale, a partnership distribution, gambling activity — and traces it to determine whether it was correctly reported.
• Lifestyle indicators. Significant gaps between what the return shows and what the taxpayer’s life suggests — homes, cars, travel, business interests visible on social media — are flags that lead agents to dig deeper.

A defense against unreported income claims requires the same level of rigor the agent is bringing — clean source-and-use schedules, full account reconciliations, and substantiated explanations for anything that would otherwise look like unreported income.

2. Inadequately Documented Deductions

Where unreported income is the largest category by dollars, inadequately documented deductions is the largest by frequency. Almost every business return audit includes scrutiny of major deductions, and the agent’s job is to test whether the deduction satisfies the substantiation requirements imposed by the Internal Revenue Code and the regulations.

Agents are trained on the specific substantiation requirements that apply to common deduction categories:

• Travel and entertainment (T&E). Section 274(d) imposes strict substantiation requirements. The taxpayer must document amount, time, place, and business purpose for each expense. Estimates are not allowed for expenses subject to Section 274(d). T&E logs that look like they were reconstructed in preparation for the audit are scrutinized — and frequently rejected.
• Vehicle expenses. Mileage logs, business-use percentages, and the substantiation of the business purpose for each trip are all developed. Agents are trained to identify reconstructed mileage logs and to challenge implausible business-use percentages.
• Home office deductions. Exclusive use, regular use, and the principal-place-of-business or client-meeting requirements are tested. Photos, square-footage measurements, and the agent’s general impression of whether the home office is genuinely used as represented all factor in.
• Charitable contributions. Substantiation requirements vary by amount and type — cash gifts, non-cash gifts, gifts of $250 or more, and gifts requiring qualified appraisals each have their own rules. Failures of substantiation can disallow otherwise valid deductions in full.
• Section 162 ordinary-and-necessary requirements. Beyond substantiation, the agent tests whether each deduction is genuinely ordinary and necessary for the business — and whether items claimed as business expenses are actually personal.

The defense against deduction challenges is documentation that exists at the time the audit opens, not documentation reconstructed during the audit. Agents are trained to spot reconstruction.

3. Related-Party Transactions

Related-party transactions are a category where agents apply heightened scrutiny because the parties to the transaction are not arms-length. Family members, controlled entities, partners and partnerships, shareholders and corporations — any of these relationships invites examination of whether the transaction was structured and priced as it would have been between unrelated parties.

Common related-party issues agents are trained to develop:

• Intercompany loans. Loans between related entities are tested for whether they are bona fide loans (with stated interest rates, repayment terms, and actual repayments) or disguised distributions, contributions, or compensation. A “loan” without the indicia of a real loan is recharacterized.
• Compensation to family members. Wages paid to spouses, children, or other family members are tested for whether the family member actually performed services and whether the compensation was reasonable for those services.
• Rents to controlled entities. Rent paid by a business to a controlled entity (or to the owner personally) is tested for fair-market rate and arms-length terms.
• Personal expenses paid by the business. Business deductions for items that benefit the owner personally — vehicles, travel, entertainment, residences — are scrutinized for whether they were properly characterized.
• Section 482 and transfer pricing in international contexts. For multinational structures, transfer pricing on cross-border related-party transactions is a major audit focus.

Adjustments in this category can have downstream consequences. Reclassifying a loan as a distribution affects basis and may trigger dividend treatment. Reclassifying compensation as a distribution affects employment tax liability. The agent is often developing not just the immediate adjustment but the consequential adjustments that flow from it.

4. Foreign Accounts and Offshore Activity

Foreign account activity is its own category — not because it generates the largest adjustments by frequency, but because the penalty regime is among the most severe in the tax law. FBAR penalties for willful non-filing can reach the greater of $100,000 (adjusted for inflation) or 50% of the account balance, per violation, per year. Form 8938 penalties stack on top. Information return failures under Sections 6038, 6038A, 6038B, 6038D, and others impose additional penalties.

Agents in this area are trained to identify and develop:

• Unreported foreign accounts. Failures to file FBAR (FinCEN Form 114) or Form 8938 — or both — are a primary focus. The IRS has access to substantial third-party data through FATCA and intergovernmental agreements that allows it to identify foreign accounts the taxpayer did not disclose.
• Unreported foreign income. Income earned in foreign accounts, foreign business interests, or foreign passive income arrangements (like PFIC investments) is examined for proper reporting.
• Foreign business interests. Form 5471 (controlled foreign corporations), Form 8865 (foreign partnerships), Form 3520 and 3520-A (foreign trusts and gifts), and similar information returns are examined for completeness and accuracy.
• Willfulness analysis. Where the foreign account or activity was unreported, the agent develops the willfulness analysis — whether the failure was willful (with the harshest penalties) or non-willful (with significantly reduced penalties under streamlined procedures).

Resolution typically involves streamlined offshore procedures, delinquent FBAR submissions, or delinquent foreign information return submissions, depending on the specific facts and the willfulness analysis. The choice of procedure is consequential — and it is a legal decision, not just an accounting one.

5. Cryptocurrency and Digital Asset Activity

Cryptocurrency is a relatively new audit category, but it has rapidly become one of the most active. The IRS has built out substantial enforcement infrastructure — including Operation Hidden Treasure, John Doe summonses against major exchanges, blockchain analytics partnerships, and expanded reporting under digital asset broker rules — and Revenue Agents working these cases now arrive with more data than most taxpayers expect.

Agents in cryptocurrency examinations are trained to develop:

• Unreported dispositions. Sales, trades, and uses of cryptocurrency are taxable events. Crypto-to-crypto trades are taxable. Spending crypto is taxable. Many returns omit these.
• Basis and holding period reconstruction. Where dispositions were reported but basis was undocumented or implausible, the agent challenges the basis and may treat undocumented basis as zero — significantly increasing the gain.
• Mining, staking, airdrops, and hard forks. These produce ordinary income items that are routinely missed on returns.
• The Form 1040 digital asset question. A “no” answer on the digital asset question paired with known activity is a finding agents log and use — supporting penalty positions and, in serious cases, criminal referrals.
• Foreign exchange use. Cryptocurrency held on foreign-domiciled exchanges raises FBAR and Form 8938 issues that flow back into the foreign account category above.

We covered this category in detail in our article on inside an IRS cryptocurrency audit. For active crypto traders, NFT participants, and DeFi users, this is now one of the highest-probability examination categories.

What This Means for Audit Defense

The five categories above account for the substantial majority of meaningful IRS examination adjustments. A defense team that understands what agents are trained to look for — and the specific analytical techniques they apply — can prepare for the audit before it opens, anticipate the issues that will be developed, and shape the response strategy accordingly.

This is what an IRS-insider perspective on the defense team actually delivers. With Otto Bosch’s background as a former Revenue Agent in the IRS Global High Wealth Group and Alex Kugelman‘s nearly two decades of federal tax controversy experience, Kugelman Law approaches every audit defense matter with working knowledge of the playbook on the other side of the table. Our article on why a former IRS revenue agent attorney changes audit defense covers the team capability in depth.

Representative outcomes from the firm’s audit defense practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

Frequently Asked Questions

What is the most common issue in IRS audits?

Inadequately documented deductions appear in the largest number of business return examinations. Unreported income generates the largest aggregate adjustments by dollars. Most substantive examinations involve some combination of both, plus issues from the other categories above.

How does the IRS know about my foreign accounts?

The IRS receives substantial third-party data through FATCA, intergovernmental information exchange agreements, John Doe summonses against foreign banks and exchanges, and other sources. The assumption that foreign accounts are invisible to the IRS has not been accurate for years and continues to become less accurate.

Do IRS auditors actually do bank deposit analysis?

Yes — particularly in audits of self-employed taxpayers, cash-intensive businesses, and individuals where the agent has reason to suspect unreported income. Bank deposit analysis is a standard examination technique that compares total deposits across accounts against reported gross income to identify gaps.

What records do I need to substantiate business deductions?

Substantiation requirements vary by deduction type. Travel and entertainment expenses subject to Section 274(d) require documentation of amount, time, place, business purpose, and business relationship. Vehicle expenses require contemporaneous mileage logs. Charitable contributions of $250 or more require contemporaneous written acknowledgment. The general principle is that documentation should exist at the time of the expense — not be reconstructed during an audit.

Can the IRS audit cryptocurrency activity?

Yes, and it actively does. The IRS has built substantial enforcement infrastructure for digital asset matters, including blockchain analytics, exchange data obtained through John Doe summonses, expanded broker reporting, and dedicated training for Revenue Agents. Cryptocurrency audits are no longer rare.

Speak With Kugelman Law

If you are facing an IRS or FTB audit, controversy, or complex federal tax matter — or if you have unreported activity in any of the categories above and are weighing how to resolve it — schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

If you understand what an IRS Revenue Agent does on paper, you understand half of an examination. The other half — the half that determines outcomes — is how they think. The mental model an agent brings to a case shapes which issues get developed, which positions get pushed, which compromises get accepted, and ultimately whether your audit closes for $0, for the full proposed adjustment, or somewhere in between.

This is the IRS audit playbook from inside. Not the procedural manual published in the Internal Revenue Manual — that document is publicly available — but the working mental framework that experienced Revenue Agents actually use as they prioritize cases, identify issues, and make the dozens of small decisions that aggregate into an examination’s outcome.

This article is informed by Kugelman Law attorney Otto Bosch, who served as a Revenue Agent in the IRS Global High Wealth Group within the Large Business and International (LB&I) Division before joining the firm in February 2026. For an introduction to what Revenue Agents formally do and how examinations are structured, see our companion piece on what an IRS Revenue Agent does. The article below picks up where that one leaves off — focused not on the structure of an audit but on the thinking behind it.

How Returns Get on the Radar in the First Place

Most taxpayers imagine return selection as a uniform process. In practice, it is a triage. The IRS receives more than 150 million individual returns each year, and the examination function can pursue only a small fraction of them. Every return that reaches a Revenue Agent’s desk has survived multiple rounds of selection — which means by the time the examination opens, someone in the IRS has already decided this return is worth investing real resources in.

That triage happens through several mechanisms — DIF scoring, related-return pickups, information matching, project initiatives, and others — which we covered in detail in our prior article. What matters for understanding the playbook is the agent’s mindset when a case is assigned: the agent assumes there is something to find. The selection process is statistical, not certain — but it is good enough that experienced agents do not approach examinations as fishing expeditions. They approach them as recovery operations: the system has flagged something, and the agent’s job is to figure out what.

This default assumption matters defensively. Many taxpayer responses during an audit are calibrated to “look cooperative” or “explain things,” on the assumption that the agent is starting from neutral. The agent is not starting from neutral. The agent is starting from “the system thinks something is here.” Responses calibrated to that posture are different from responses calibrated to a neutral counterparty.

How a Revenue Agent Builds a Case from Suspicion to Adjustment

An audit, viewed from the agent’s seat, is not a single inquiry. It is a layered case-building exercise. Each layer corresponds to a different mental task.

Stage 1: Pre-Contact Intuition

Before the agent ever issues a notice, they have read the return, the notes from selection, prior-year filings, and any third-party data already in IRS systems. They have formed a working hypothesis about what the case is — and a working list of issues they expect to develop. Experienced agents are usually right about the rough shape of the case before the first IDR ever leaves their desk.

What the taxpayer sees as the “first contact” is, from the agent’s perspective, the third or fourth phase of the case. Defense strategies that treat the opening conference as the start of the audit are already a step behind.

Stage 2: Issue Identification Through Documents

The first Information Document Request (IDR) is the agent’s tool for confirming or refuting the pre-contact hypothesis. They are not asking for documents because they want to read receipts. They are asking because they want to see whether reality matches their hypothesis — and where reality does not match, they want to see where the gaps are.

Experienced agents read taxpayer responses for three signals: what was produced, what was conspicuously absent, and what the production reveals about how the taxpayer keeps records. A neat, well-organized response signals a sophisticated taxpayer (and probably a careful preparer). A messy, partial, or contradictory response signals issues that are likely to multiply as the audit goes deeper. Both responses tell the agent how aggressively to invest in the case.

Stage 3: Position Development

Once issues are identified, the agent shifts from finding things to building something. A “position” is the IRS’s articulated theory for why a particular adjustment should be made — and the case file the agent builds to support that position is what survives into Appeals, into Tax Court, and into any settlement discussion.

This is where mental discipline starts to differentiate experienced agents from inexperienced ones. Strong positions are built on documents, third-party records, and clean factual narratives. Weak positions rely on inference, taxpayer statements, or agent-developed math that the taxpayer can re-do. A good defense team can usually tell within the first few exchanges which kind of position the agent is building.

Stage 4: Workpaper Construction and Supervisory Sign-Off

Workpapers are not the agent’s notes. They are the IRS’s case file — the formal record that managers, IRS Counsel, Appeals officers, and (if it gets that far) the Tax Court will rely on. Every position the agent develops must eventually be expressed in workpapers that withstand internal review.

This creates a meaningful internal filter. Positions an agent personally believes in but cannot reduce to a clean workpaper get dropped. Positions a manager pushes back on get refined or abandoned. Positions IRS Counsel will not support get withdrawn. The defense team that understands this filter — that knows which positions are likely to survive review and which are not — can apply pressure exactly where it is most likely to produce results.

The Internal Pressures That Shape Every Audit Decision

A Revenue Agent does not have unlimited time, and the IRS does not have unlimited capacity. Every audit operates under three quiet but constant pressures that shape decisions taxpayers rarely see.

Cycle time. Agents have caseload expectations. An audit that drags is an audit that pulls the agent away from their other cases — and from their performance metrics. This is one of the reasons that responsive, well-organized taxpayer cooperation often produces better outcomes than passive resistance: the agent’s incentive is to close the case efficiently, and giving them a clean path to closure is sometimes worth more than fighting every issue.

Review risk. Every aggressive position the agent advances will be reviewed — by the manager, by IRS Counsel, sometimes by Appeals. An agent who advances positions that get overturned at review damages their internal credibility. This is why agents are often reluctant to push aggressive penalty positions, civil fraud allegations, or controversial legal theories unless the workpapers genuinely support them. Recognizing the threshold at which an agent will or will not commit to a position is one of the highest-leverage insights a defense team can have.

Specialty referrals. Complex examinations frequently involve specialists — international examiners, computer audit specialists, financial product specialists, valuation engineers. Bringing in a specialist takes time and case management. Agents weigh the value of escalation against its cost. A defense that signals a serious specialist would face credible counter-arguments may shift the case toward narrower issues that the agent can resolve without bringing in additional resources.

What Agents Look For That Taxpayers Don’t Recognize

Some of the most valuable inside-the-IRS knowledge is also the most counterintuitive. The signals below are things Revenue Agents are trained to read but that taxpayers and unprepared representatives often miss entirely.

• Lifestyle versus reported income. Significant gaps between what the return shows and what the taxpayer’s life suggests — homes, cars, travel, business interests visible on social media — are flags agents notice early. The IRS has access to public records and increasingly to other data streams that make these comparisons routine.
• Round numbers. Returns full of round numbers (exactly $5,000 in expenses, exactly $10,000 in donations) signal estimation rather than documentation. Agents notice this and adjust the audit accordingly.
• Inconsistencies across years. A line item that appeared in 2022 but vanished in 2023 — or a deduction that scaled non-linearly with income — invites questions. Agents do not always pursue these, but they note them, and they shape the case file.
• Related-party transactions without arms-length characteristics. Loans between entities with no documented terms, payments to family members for unspecified services, or rent to controlled entities at non-market rates draw immediate attention.
• Cash-intensive businesses with thin paper trails. Restaurants, salons, contractor businesses, and other cash-heavy operations get scrutinized differently. Agents are trained to test reported gross receipts against industry norms and against bank deposits.
• Crypto and digital asset patterns. Returns showing digital asset activity without corresponding income items, or returns answering “no” to the digital asset question while exchange data shows otherwise, are flagged. Our article on IRS cryptocurrency audits explores this pattern in detail.
• Suspiciously timed amendments and late filings. Returns amended after the IRS opened an audit, or returns filed unusually late after notices, draw heightened attention. Agents note timing.

The pattern in all of these: agents are reading the return for signals about the taxpayer, not just about the numbers. Defense strategies that focus only on document production miss this dimension entirely.

How Agents Decide Whether to Push or Fold on an Issue

One of the most useful insights from inside the IRS is the recognition that agents do not push every issue to its limit. Many issues are noticed, considered, and quietly dropped — because the cost-benefit math does not work for the IRS.

The internal calculus on a given issue weighs:

• The dollar amount at stake
• The strength of the documentary support
• The likelihood the position survives Appeals or Tax Court
• The agent’s confidence in the legal theory
• The amount of additional development needed
• Whether the issue connects to other issues already being developed

Issues with strong documentary support, clear law, and meaningful dollars tend to be pushed. Issues with weak documentary support, ambiguous law, or trivial dollars tend to be dropped — even if the agent personally suspects the taxpayer’s position is wrong. The IRS does not pursue every theoretical adjustment. It pursues the ones that pencil out.

A sophisticated defense uses this. By making strong positions stronger and exposing weak positions early, the defense can shift the agent’s calculus on a case. Issues that were borderline tend to fall toward dropping. Issues that were marginal tend to settle on terms favorable to the taxpayer.

When the Audit Plays By Different Rules

Most of the playbook described above applies to standard examinations. There are categories of audits where the rules shift, and recognizing the shift is critical.

Eggshell audits — civil examinations with potential criminal implications — operate under an entirely different set of rules. The agent’s job is no longer to develop adjustments efficiently but to develop the record carefully, with an eye toward potential referral to IRS Criminal Investigation. Cooperation strategies that make sense in a routine audit can be catastrophic in an eggshell audit.

Global High Wealth and LB&I enterprise audits are also their own world. Cycle-time pressures are different, specialist resources are abundant, and the audit considers the entire web of related entities and transactions rather than the individual return. The mental model a Global High Wealth team brings to a case is integrated and patient in ways most taxpayers do not expect.

Project-driven examinations — audits opened as part of a focused enforcement initiative — also play differently. The agent has trained on the project’s target issue, has examined other taxpayers in the same project, and has internal guidance on what positions to develop. A defense that does not recognize the project’s contours will misread the agent’s posture entirely.

In each of these scenarios, defending without inside-the-IRS perspective is defending blind.

What This Means for Defense Strategy

The aggregate of everything above has a single practical implication for taxpayers under audit: the most consequential decisions in your audit are not the visible ones. They are the unseen ones — the agent’s pre-contact hypothesis, the position-building decisions in the workpaper file, the internal review pressures, the issue-by-issue cost-benefit calculations, and the specific signals the agent is reading from your responses that you do not realize you are sending.

This is what an IRS-insider perspective on the defense team actually changes. With Otto Bosch’s experience inside the IRS Global High Wealth Group and Alex Kugelman‘s nearly two decades of federal tax controversy litigation, Kugelman Law approaches every audit defense matter with a working understanding of the playbook on the other side of the table — and a credible litigation backstop if the case cannot be resolved administratively. We covered the full team capability in our article on why a former IRS revenue agent attorney changes audit defense.

Representative outcomes from the firm’s audit defense practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

If you would like to discuss your IRS or FTB matter and how the firm’s combination of inside-the-IRS perspective and federal tax litigation experience can shape your defense, see our tax help resources or contact the firm directly.

Frequently Asked Questions

How do IRS auditors decide which issues to focus on?

Revenue Agents prioritize issues based on a combination of dollar magnitude, strength of documentary support, clarity of the legal theory, and the cost in agent time required to develop the position. Issues that are well-supported, technically clean, and material to the case tend to be pushed. Issues that are weak, ambiguous, or trivial tend to be quietly dropped — even when the agent personally suspects the taxpayer’s position is incorrect.

What red flags do IRS auditors look for?

Common signals include lifestyle inconsistent with reported income, returns full of round numbers, year-over-year inconsistencies in reported items, related-party transactions without arms-length characteristics, cash-intensive businesses with thin documentation, digital asset activity that does not align with reported income, and suspiciously timed amended or late-filed returns.

Can an IRS auditor decide to drop an issue mid-audit?

Yes. Issues that look promising in pre-contact analysis frequently get dropped during fieldwork as documents and explanations come in. Conversely, issues that were not initially identified can emerge from the development process. Audit scope is not fixed at the opening conference — it evolves as the case develops.

What does it mean when an IRS audit closes “no change”?

A no-change closing means the agent did not develop adjustments and the return is accepted as filed. This outcome is more common than many taxpayers assume. It occurs when the issues identified at selection do not survive document review, when the taxpayer’s documentation is strong, or when the cost-benefit math on the available positions does not justify pursuing them.

How do I know if my IRS audit is becoming an eggshell audit?

There are signals — agent questions that focus on knowledge, intent, and willfulness rather than documentation; involvement of specialized fraud or referral-related personnel; specific timing patterns in document requests; and sudden agent reluctance to discuss the case. Recognizing these signals reliably requires controversy experience. If you have any reason to suspect criminal exposure, attorney representation is essential and should be retained before any further communication with the IRS.

Speak With Kugelman Law

If you are facing an IRS audit, controversy, or complex federal tax matter — or if you suspect the IRS is preparing to open one — schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

When the IRS opens an examination of your return, the first practical question is who you should hire to defend it. Most taxpayers default to their CPA — and for many routine examinations, that is the right call. Some hire a tax attorney. A few hire an Enrolled Agent. And a small number ask the more sophisticated question: should my defense team include someone who has actually worked as an IRS Revenue Agent?

This article walks through the differences honestly. Tax attorney vs CPA for IRS audit defense is not always the right framing. For some matters, a CPA is exactly what is needed. For others, only a tax attorney can do what the situation requires. And for the most consequential cases, the right answer is a defense team that combines both legal authority and the inside-the-IRS perspective of a former Revenue Agent.

This is how Kugelman Law structures its audit defense practice, and the rest of this article explains why.

The Three Professionals Who Can Represent You Before the IRS

Federal regulations recognize three categories of professionals authorized to represent taxpayers before the IRS:

Tax Attorney

A licensed lawyer admitted to one or more state bars who practices in tax. The defining attributes are legal training, attorney-client privilege, the ability to litigate in court — including U.S. Tax Court, U.S. District Court, and the Court of Federal Claims — and the authority to provide legal advice. Within tax law, attorneys vary widely in specialization. Some focus on planning and transactions; others focus on controversy and litigation. For audit defense, the relevant subspecialty is tax controversy.

Certified Public Accountant (CPA)

A licensed accountant who has passed the Uniform CPA Examination and met state licensing requirements. CPAs are tax preparation, accounting, and auditing professionals. They can represent clients before the IRS in many circumstances. The defining attributes are accounting depth, fluency in financial statements and tax returns, and — for many CPAs — a long-running client relationship built around return preparation.

Enrolled Agent (EA)

A federal credential granted by the IRS itself. Enrolled Agents have either passed the Special Enrollment Examination (a three-part exam covering individual taxation, business taxation, and representation) or qualified through prior IRS employment. EAs have unlimited practice rights before the IRS. Their defining attributes are tax-specific expertise and a federal credential focused entirely on tax matters.

A practitioner can hold more than one of these credentials. Many tax attorneys are also CPAs. Some, like Kugelman Law’s Otto Bosch, are both attorneys and Enrolled Agents — and bring direct prior experience as IRS Revenue Agents.

What Each Professional Can and Cannot Do

The differences become consequential when you look at the specific things each professional can and cannot do during an audit.

All three can represent you before the IRS in audits, appeals, and collections matters. All three can communicate with examiners on your behalf, respond to Information Document Requests, attend conferences, and negotiate settlements. For many routine examinations, this scope of authority is sufficient.

Only attorneys can:

• Provide formal legal advice, including opinions on legal questions
• Litigate cases in federal court — including U.S. Tax Court, U.S. District Court, and the Court of Federal Claims (CPAs and EAs may litigate in U.S. Tax Court only after passing the Tax Court Examination, and even then their authority is limited to that single court)
• Maintain full attorney-client privilege over communications about your case
• Apply privilege protection to work product developed in anticipation of litigation
• Handle matters with parallel criminal exposure within the privileged framework needed to protect the client

That last point — privilege — is the single most consequential difference, and it deserves its own discussion.

The Critical Difference: Attorney-Client Privilege

Communications with a tax attorney are protected by attorney-client privilege when they meet the conditions privilege requires. That means the IRS cannot compel the attorney to disclose what the client told them, and in most circumstances cannot compel the attorney’s notes, analyses, or work product developed in anticipation of litigation.

Communications with a CPA or EA do not have the same protection. The Internal Revenue Code provides a limited “tax practitioner privilege” under Section 7525 — but it is significantly narrower than attorney-client privilege. Section 7525 privilege does not apply to criminal matters. It does not apply to written tax shelter advice. It does not apply in state proceedings. And courts have generally read it more narrowly than many taxpayers expect.

The practical implication is this: if there is any meaningful chance that an examination has criminal implications — which is true in eggshell audits, in cases involving large unreported income, in cases with foreign account issues, and in cases involving cryptocurrency where the digital asset question was answered incorrectly — communications with a CPA or EA are not safely privileged. Communications with an attorney are.

This is why sophisticated tax controversy practice often involves a “Kovel arrangement” — a structure in which a CPA is engaged by the attorney rather than directly by the client, so that the CPA’s work falls within the attorney’s privilege. That structure is appropriate in many controversy matters. It is also a structure that requires an attorney at the center of the engagement.

When You Need a Tax Attorney (and When You Don’t)

Not every IRS audit requires an attorney. A correspondence audit on a missing 1099 or an arithmetic error generally does not. A modest Schedule C examination focused on documentation of business expenses generally does not. For these matters, a CPA or EA — particularly one familiar with the client and the return — is often the right professional to handle the response.

A tax attorney becomes the appropriate choice when one or more of the following is true:

• The dollar amounts are significant. Audits with potential exposure in the high five figures and above generally justify the additional cost of attorney representation.
• The technical issues are complex. Partnership and S-corporation audits, related-party transactions, basis disputes, and characterization questions benefit from legal analysis as well as accounting analysis.
• There is parallel criminal exposure. Eggshell and reverse-eggshell audits require attorney representation for privilege reasons alone.
• Foreign accounts are involved. FBAR penalties, Form 8938 issues, and the willfulness analyses that drive offshore disclosure outcomes are legal questions with severe penalty consequences.
• Cryptocurrency is involved. IRS cryptocurrency audits frequently combine unreported income, foreign exchange use, and digital asset question issues that benefit from legal analysis.
• The case is likely to escalate. Matters that may proceed to Appeals or to U.S. Tax Court litigation need an attorney engaged from the start, because the record built during the examination is what the case is ultimately decided on.
• You disagree fundamentally with the IRS. Where the dispute is not about documenting items but about legal positions the IRS is asserting, attorney involvement is generally appropriate.
• Penalties are aggressive. Civil fraud, substantial understatement, and other significant penalties often require legal defense beyond accounting fluency.

The Often-Overlooked Question: Has Anyone on Your Team Worked Inside the IRS?

Most discussions of tax attorney versus CPA stop at the comparison above. There is a further layer that tends to be invisible from outside the controversy field: the value of having someone on the defense team who has actually worked as an IRS Revenue Agent.

A former Revenue Agent attorney brings something neither a tax attorney nor a CPA can bring on their own — direct, internal experience with how the IRS actually conducts examinations. This includes:

• Knowing what an agent’s first IDR will likely ask for and what the second and third will probably address
• Recognizing when an agent is genuinely committed to a position versus when the agent is fishing
• Understanding the internal review architecture — supervisor review, IRS Counsel coordination, fraud referral pathways — that filters every meaningful decision an agent makes
• Reading the difference between a routine audit and an eggshell audit early enough to adjust strategy
• Building a defense record that anticipates what the IRS will need at Appeals or in Tax Court

This is the perspective Otto Bosch brings to Kugelman Law. Before joining the firm in February 2026, Otto served as a Revenue Agent in the IRS Global High Wealth Group within LB&I — the unit that audits the most complex returns of the wealthiest U.S. taxpayers. He is also an Enrolled Agent and holds an LL.M. in Taxation. We covered this layered advantage in detail in our article on why a former IRS revenue agent attorney changes audit defense, which complements our broader explanation of what IRS Revenue Agents actually do inside an examination.

For taxpayers facing significant IRS examinations, this third dimension — beyond “attorney versus CPA” — is often the deciding factor in case outcomes.

How Kugelman Law’s Team Combines These Capabilities

Kugelman Law is structured deliberately around the capabilities a serious controversy matter actually requires.

Founder Alex Kugelman brings nearly two decades of federal tax controversy experience, including litigation in U.S. Tax Court and U.S. District Court. He is a member of the State Bar of California, served as San Francisco Chair of the Federal Bar Association’s Tax Division in 2018, and is a nationally recognized cryptocurrency tax attorney featured on the Bitcoin.tax podcast and The Mark Milton Show. The litigation capability matters because the credible threat of taking a case to court is what gives administrative resolution its leverage.

Otto Bosch brings the inside-the-IRS perspective from his time as a Revenue Agent in the Global High Wealth Group, plus additional technical depth from his prior role at KPMG’s Washington National Tax practice. He holds an LL.M. in Taxation with a focus on Partnership Tax and is an Enrolled Agent.

The combination — attorney + IRS-insider + crypto fluency + federal litigation capability — is what most controversy practices simply cannot offer. CPAs and EAs working alone cannot provide privilege or court access. Tax attorneys without IRS experience operate without the insider perspective. Firms with neither litigation experience nor inside-the-IRS background are missing both ends of the controversy spectrum.

Representative outcomes from the firm’s audit defense practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

A Practical Decision Framework

For taxpayers trying to decide who should handle their IRS audit, a practical framework:

1. For routine correspondence audits and simple documentation matters — your existing CPA or EA is often the right choice. The cost-benefit analysis favors them.
2. For substantive examinations involving real money or complex issues — engage a tax controversy attorney. The privilege protection alone justifies the choice in many cases.
3. For high-stakes examinations — Global High Wealth, LB&I, multi-year non-filing, foreign accounts, cryptocurrency, or parallel criminal exposure — engage a tax controversy firm whose team includes both senior litigation experience and former IRS-insider perspective.

The decision is not always either/or. Many engagements involve attorney-led representation with a CPA performing supporting accounting work under the attorney’s privilege through a Kovel arrangement. The point is that the highest-stakes cases benefit from legal authority, privilege protection, litigation capability, and inside-the-IRS perspective — and the question is whether your defense team has them.

Frequently Asked Questions

Can a CPA represent me in an IRS audit?

Yes. CPAs have authority to represent taxpayers before the IRS in audits, appeals, and collections matters. For many routine examinations, CPA representation is appropriate. The limitations of CPA representation become significant in cases with criminal exposure, in matters likely to require litigation, and in matters where attorney-client privilege protection is needed.

Do I have attorney-client privilege with a CPA?

Not in the same way you do with an attorney. The Internal Revenue Code provides a limited “tax practitioner privilege” under Section 7525, but it is substantially narrower than attorney-client privilege. It does not apply in criminal matters, in tax shelter advice, or in many state proceedings. For matters where privilege is important, attorney representation is generally needed.

Is a tax attorney more expensive than a CPA?

Generally yes — hourly rates for tax controversy attorneys are higher than CPA rates. Whether the higher cost is justified depends on the matter. For complex, high-stakes, or potentially adversarial cases, attorney involvement frequently produces better outcomes that more than offset the cost difference. For routine matters, a CPA may be the more efficient choice.

What is an Enrolled Agent and how do they fit in?

An Enrolled Agent is a federal credential granted by the IRS. EAs have unlimited practice rights before the IRS and focus exclusively on tax matters. They can represent taxpayers in audits, appeals, and collections. They do not have legal training or attorney-client privilege, and their authority to litigate is limited. Some practitioners — like Kugelman Law’s Otto Bosch — are both attorneys and Enrolled Agents.

Should I keep my CPA involved if I hire a tax attorney?

Often, yes. Many controversy engagements work best when the attorney leads representation and the CPA contributes specialized accounting work — particularly on complex returns, basis reconstructions, and ongoing compliance. The CPA’s work can be performed under the attorney’s privilege through a Kovel arrangement when appropriate. Coordinated team representation is frequently the optimal structure.

Speak With Kugelman Law

If you are facing an IRS audit, controversy, or complex tax matter and want to understand how the right combination of legal authority, IRS-insider perspective, and federal litigation capability can shape your defense, schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

An IRS cryptocurrency audit is no longer a theoretical concern for active traders, NFT participants, DeFi users, or anyone who has held digital assets through one of the bull cycles of the past decade. It is an active risk. And the agents conducting these examinations are increasingly trained, equipped, and supported by the agency’s data resources to develop adjustments that can carry into six and seven figures of assessed tax, penalties, and interest.

This article explains what an IRS cryptocurrency audit actually looks like from the inside — how returns are selected, what agents are trained to examine, what data the IRS already has, and where defense actually matters. The perspective is informed by Kugelman Law attorney Otto Bosch, a former Revenue Agent in the IRS Global High Wealth Group within the Large Business and International (LB&I) Division, paired with founder Alex Kugelman‘s nearly two decades of federal tax controversy experience and one of the country’s earliest dedicated cryptocurrency tax practices.

How the IRS Is Building Its Crypto Enforcement Capability

Understanding an IRS cryptocurrency audit starts with understanding what the IRS now knows — and how it knows it.

Exchange data through John Doe summonses. The IRS has used John Doe summonses to compel major U.S. cryptocurrency exchanges to produce account holder data, including identification information and transaction histories. The summonses served on Coinbase, Kraken, Circle, and others have produced datasets covering significant numbers of U.S. taxpayers. That data sits in IRS systems and is matched against filed returns.

Form 1099 reporting and digital asset broker rules. Expanded broker reporting rules require digital asset platforms to report transaction information directly to the IRS on information returns. The result is a steadily improving stream of third-party data that the IRS uses to identify reporting gaps, in much the same way W-2s and traditional 1099s are used.

The Form 1040 digital asset question. Every Form 1040 filed since 2019 has required the taxpayer to answer a yes-or-no question about digital asset activity. Answering that question incorrectly — particularly answering “no” when the taxpayer had reportable activity — is a fact the IRS pays attention to. It can support penalty positions, including in some circumstances civil fraud.

Blockchain analytics partnerships. The IRS works with blockchain analytics firms — Chainalysis among them — to trace transactions across the public blockchain, link wallet addresses to identified taxpayers, and reconstruct activity that occurred outside reporting exchanges. The blockchain is public; identifying who controls a particular address is the harder part, and the analytics tools the IRS has access to are increasingly capable of doing it.

Operation Hidden Treasure and successor initiatives. Beginning with Operation Hidden Treasure, the IRS has run dedicated training and enforcement programs focused on cryptocurrency. Revenue Agents working these cases receive specialized training. Specialized criminal investigation resources within IRS-CI focus on digital assets. And large-case examinations within LB&I increasingly include cryptocurrency-specific issue identification.

The cumulative effect is that an IRS cryptocurrency audit in 2026 is not the same examination it was five years ago. Agents arrive with significantly more information than taxpayers tend to assume.

Who Gets Selected for an IRS Cryptocurrency Audit

Crypto returns reach Revenue Agents through several paths, and the path tells the defense team something about the IRS’s interest in the case. As a general matter — and consistent with how returns are selected for examination across the IRS, which is covered in more depth in our guide to what IRS Revenue Agents do — crypto cases tend to be selected through:

• Information matching mismatches. When exchange-reported data shows reportable activity that does not appear on the taxpayer’s return, the gap is flagged for review. This is one of the most common entry points for crypto examinations.
• The Form 1040 digital asset question. Returns answering “no” while exchange data shows otherwise are high priority. So are returns answering “yes” with implausibly small reported activity relative to known holdings.
• John Doe summons follow-up. Account data produced through John Doe summonses is reviewed against filed returns; significant unreported activity surfaces examination candidates.
• Project initiatives. The IRS has run and continues to run focused enforcement projects on specific crypto issues — high-volume traders, NFT activity, DeFi transactions, and offshore exchange usage among them.
• Related-return pickups. When one taxpayer’s audit surfaces crypto activity involving counterparties — peer-to-peer transactions, partnership distributions of digital assets, business payments in crypto — the related taxpayer’s return can be opened for examination.
• Whistleblower referrals. The IRS Whistleblower Program receives, and acts on, referrals involving crypto activity.

The path matters because it shapes the examination. A mismatch-driven case usually starts narrow and follows the data. A project-driven case is concentrated on the project’s target issue. A John Doe summons follow-up may already include significant data the agent has reviewed before contacting the taxpayer.

What Revenue Agents Are Trained to Look For in a Cryptocurrency Audit

An IRS cryptocurrency audit covers a defined set of issues that Revenue Agents are trained to develop. Knowing what those issues are — before the first Information Document Request lands — is one of the most important advantages a defense team can bring to the table.

Unreported Disposition Income

The most common issue is straightforward: dispositions that should have been reported as taxable events were not. Every sale, trade, and use of cryptocurrency to purchase goods or services is generally a taxable event, and the gain or loss is calculated against the asset’s basis. Crypto-to-crypto trades are taxable. Spending Bitcoin on a meal is taxable. Swapping ETH for an NFT is taxable. Many taxpayers — and even some preparers — have historically missed these dispositions, and reconstructing them is the heart of most crypto examinations.

Basis and Holding Period Reconstruction

Once dispositions are identified, the next question is basis. What did the taxpayer pay for the asset, when, and how is the cost allocated across multiple acquisitions? Crypto basis is uniquely difficult because it spans years, exchanges, wallets, and methods of acquisition. Agents trained on these cases know that taxpayer-prepared crypto records are often incomplete, that exchange CSV exports do not always reconcile cleanly, and that an undocumented basis position will be challenged. Holding periods — long-term versus short-term — drive significant differences in tax rate and are scrutinized.

Income From Mining, Staking, Airdrops, and Hard Forks

Income items that arise outside of dispositions are a separate audit category. Mining and staking rewards are generally taxable as ordinary income at fair market value when received, and they create a basis carried into any later disposition. Airdrops and hard forks have IRS guidance — including Revenue Ruling 2019-24 — that agents apply. These items are routinely under-reported, and they are routinely raised in cryptocurrency examinations.

NFT-Specific Issues

Non-fungible tokens introduce their own audit issues: characterization questions (collectible versus capital asset versus inventory), royalty income, gas fees, the treatment of mints, and platform-specific reporting peculiarities. Revenue Agents working NFT tax compliance matters are trained on the issues that NFT activity tends to produce — and they tend to produce a lot of them.

DeFi Activity and Wrapped Tokens

DeFi protocols — lending, liquidity provision, yield farming, wrapping and unwrapping tokens — generate transactions that may or may not be taxable events depending on facts and characterization, and the area is technically nuanced. Agents look for the obvious — unreported income from yield farming and lending — and increasingly for the more sophisticated — characterization of liquidity pool entries and exits, and the tax consequences of wrapping transactions.

Foreign Exchange Use and FBAR Exposure

Use of foreign-domiciled cryptocurrency exchanges raises issues that go beyond the tax return itself. Foreign accounts holding cryptocurrency may trigger FBAR (FinCEN Form 114) and Form 8938 reporting obligations, and the IRS’s position on these obligations has evolved. Penalties for non-filing of FBARs and information returns can be severe and are independent of any income tax owed. Resolution typically involves streamlined offshore procedures, delinquent FBAR submissions, or other voluntary disclosure pathways depending on the facts.

The Form 1040 Digital Asset Question

Agents are specifically trained to examine the digital asset question on Form 1040. A “no” answer in a year of significant activity is a finding agents log and use — supporting accuracy-related penalties, in appropriate cases supporting fraud penalties, and in the most serious cases supporting referrals to IRS Criminal Investigation.

Pig Butchering and Investment Scam Losses

A growing area of crypto audit activity involves taxpayers who lost significant funds to pig butchering and similar crypto investment scams. The tax treatment of these losses is technical, the documentation challenges are significant, and the available deductions are narrower than many taxpayers and preparers assume. Audits in this area frequently turn on whether the taxpayer can substantiate the loss and characterize it correctly.

The Anatomy of an IRS Cryptocurrency Audit

Once an examination opens, a cryptocurrency audit follows the general arc of any IRS examination — but with crypto-specific document requests and analytical steps layered in. The early stages are often the most consequential.

The opening Information Document Request typically asks for, among other things: a complete list of every exchange and wallet ever used; CSV exports or transaction histories from each exchange; lists of self-custody wallet addresses and their public keys or transaction logs; mining and staking records; any tax software output (such as files from CoinTracker, Koinly, ZenLedger, or similar) used to prepare the return; and any third-party reports received. The first IDR is broad by design. It is the agent’s tool for understanding the universe of activity before drilling into specific issues.

How that first IDR is responded to often determines how the audit proceeds. Volunteering wallets the IRS does not appear to know about, providing reconciliations that reveal previously undisclosed activity, or producing records that contradict the return are decisions that should never be made without strategic review. They cannot be unmade later.

From there, the agent reconciles taxpayer-produced data against exchange records the IRS has received independently, runs blockchain analytics where appropriate, and develops issues. Specialists may be brought in for technical questions. The case proceeds through the same internal review and managerial sign-off architecture that governs any IRS examination, and closes with either a no-change, an agreed adjustment, or a Revenue Agent’s Report and 30-day letter setting up Appeals.

Why Crypto Audits Are Especially High-Stakes

An IRS cryptocurrency audit can quickly produce assessment exposure that surprises taxpayers. Several factors compound:

• Multi-year scope. Crypto audits frequently look at multiple years simultaneously. The statute of limitations is generally three years, but it extends to six years for substantial omissions and is unlimited for fraud or non-filed returns.
• Penalty stacking. Accuracy-related penalties (typically 20%) can be combined with FBAR penalties (which can reach the greater of $10,000 or 50% of account value per willful violation), Form 8938 penalties, and in serious cases civil fraud penalties (75%).
• Basis disputes that move large numbers. An undocumented basis position can convert what the taxpayer considered a modest gain into a much larger one. Where the taxpayer assumed $100,000 in basis and cannot prove it, the agent may treat basis as $0 — and the assessment moves accordingly.
• Foreign account exposure. Use of offshore exchanges or foreign-held wallets can trigger reporting obligations entirely separate from the income tax — with their own penalty regimes that can dwarf the underlying tax.
• Eggshell and reverse-eggshell concerns. Where significant activity was unreported and the digital asset question was answered “no,” civil examinations carry the possibility of referral to IRS-CI. Reading that risk correctly is critical.

This combination of factors is why a former IRS revenue agent attorney on the defense team is particularly valuable in cryptocurrency examinations. The technical issues are unfamiliar to most general tax practitioners. The risks compound quickly. And the IRS’s training, tooling, and posture in this space continue to evolve in ways most taxpayers cannot see from the outside.

How Kugelman Law Defends IRS Cryptocurrency Audits

Kugelman Law has defended cryptocurrency tax matters since the practice area existed. Alex Kugelman has been featured nationally on the Bitcoin.tax podcast and The Mark Milton Show discussing IRS digital asset enforcement, and he has built one of the country’s earliest dedicated cryptocurrency accounting and IRS crypto audit defense practices. Otto Bosch brings the inside-the-IRS perspective developed during his time as a Revenue Agent in the Global High Wealth Group within LB&I.

The combination matters in a crypto audit. Crypto fluency without IRS-insider perspective leaves the defense reading blind on the agent’s posture and the agency’s internal calculus. IRS-insider perspective without crypto fluency leaves the defense unable to engage the technical issues that drive the case. Both are necessary. Few firms offer both under one roof.

Representative outcomes from the firm’s controversy practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

Frequently Asked Questions

Can the IRS see my crypto wallet?

The blockchain is public. Anyone can see transactions associated with a wallet address. What is not always public is who controls a particular address. The IRS uses blockchain analytics tools, exchange data obtained through John Doe summonses, expanded information reporting, and other techniques to associate addresses with identified taxpayers. Self-custody wallets are not invisible to the IRS — and the assumption that they are has produced significant exposure for taxpayers who relied on it.

What triggers an IRS cryptocurrency audit?

Common triggers include mismatches between exchange-reported data and the filed return, a “no” answer to the Form 1040 digital asset question paired with known activity, John Doe summons data, project-based enforcement initiatives, related-return pickups from another taxpayer’s audit, and whistleblower referrals. Selection paths shape the scope of the resulting examination.

Do I have to report crypto-to-crypto trades?

Yes. Under current IRS guidance, exchanges of one cryptocurrency for another are taxable events that produce gain or loss measured against the disposed asset’s basis. This is true even when no fiat currency is involved. Failure to report crypto-to-crypto trades is one of the most common issues identified in IRS cryptocurrency audits.

What if I used a foreign cryptocurrency exchange?

Use of foreign-domiciled exchanges can trigger FBAR and Form 8938 reporting obligations separate from the income tax return. Penalties for non-filing of these information returns can be severe. Resolution typically involves streamlined offshore procedures, delinquent FBAR submissions, or other voluntary disclosure programs depending on the specific facts and the willfulness analysis.

Can I just amend my returns to fix unreported crypto?

Sometimes — but the answer depends heavily on the facts. Amending returns can be the right approach in some cases and exactly the wrong approach in others, particularly where there is potential criminal exposure or where the taxpayer is already under examination. Decisions about amending, voluntarily disclosing, or simply waiting should be made with experienced controversy counsel — not unilaterally by the taxpayer or a preparer without controversy expertise.

Speak With Kugelman Law

If you are facing an IRS cryptocurrency audit, have received an IRS notice involving digital assets, or have unreported crypto activity you are trying to resolve correctly, schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

The article addresses the IRS Large Business and International (LB&I) Division’s 2024 audit campaign targeting deferred legal fee structures — arrangements in which law firms representing clients on contingency defer recognition of fee income through third-party structures. The campaign followed the IRS’s 2022 generic legal advice memorandum (AM 2022-007), which concluded that fees deferred through certain third-party arrangements must be included in the law firm’s gross income in the year the funds are transferred to the third party. Attorneys interviewed for the Tax Notes article reported that despite the campaign announcement, they have not yet seen active audit activity in the area.

Otto Bosch — a former IRS Revenue Agent from the LB&I Global High Wealth Group who joined Kugelman Law in February 2026 — explained why that gap is normal.

“It is generally normal for an LB&I audit campaign — or any IRS enforcement initiative — to be announced before field agents receive formal training and before training materials are finalized,” Bosch told Tax Notes.

Otto identified the structural reasons for the lag — including required reviews of the Internal Revenue Manual and relevant court decisions — and noted that IRS University, the agency unit responsible for developing and delivering training across the IRS, has been affected by recent changes at the agency.

The Tax Notes piece reports that more than 200 LB&I agents recently received two days of training on the deferred legal fee topic, according to two sources familiar with the matter. That development confirms what Otto and other former IRS practitioners have been telling clients for months: active enforcement is moving from “announced” to “trained” — and the audit window is opening.

Why This Matters for Tax Practitioners and Law Firms Right Now

The announce-then-train gap is structurally normal, as Otto explained. What is not normal is the size of the window the gap creates for practitioners and their clients — and the cost of not using it well.

Three things are true about the current posture of the deferred legal fee campaign:

1. The framework that defines compliance is clearer than the rhetoric suggests. The IRS is not targeting all deferred attorney fee structures. As George A. Luecke and Patrick J. Hindert observed in a June 2025 Tax Notes piece cited in the May 2026 article, the campaign does not appear to target structures that are compliant with the framework laid out in Childs v. Commissioner, 103 T.C. 634 (1994). The IRS’s concern is with arrangements that “materially deviate from Childs” — particularly those involving “aggressive promoters, attorney-taxpayer loans, or other structural elements that, while not technically loans, produce similar economic effects for attorney-taxpayers.”
2. The promoter investigation tells you where the IRS is going. The Tax Notes reporting confirms that the IRS issued information document requests to Brook-Hollow Capital LLC and Brook-Hollow Financial LLC in August 2023 as part of a Section 6700 investigation into whether the companies organized or promoted abusive tax shelters. The IRS’s understanding of the Brook-Hollow structure — a fee paid to one entity and a loan of up to 97% of the deferred legal fees from a related entity — is the kind of structure most at risk.
3. Criminal Investigation is starting to ask questions. The Tax Notes article reports that an IRS special agent asked about deferred legal fee arrangements during a client meeting several months ago, suggesting that IRS-CI is at least exploring the topic. While LB&I has historically been reluctant to make criminal referrals (as former IRS fraud enforcement adviser Michael Welu noted in the article), the involvement of criminal investigators changes the risk calculus for any practitioner whose structures sit outside the Childs safe harbor.

What the IRS-Insider Perspective Adds

One of the reasons Otto was sought as a source for the Tax Notes piece is that the procedural realities of IRS examination — how campaigns are launched, how field agents are trained, how the Internal Revenue Manual is updated, how cases get selected and developed — are not transparent from outside the agency. Practitioners and taxpayers tend to react to enforcement headlines without a clear sense of where the campaign actually is in its operational cycle.

That cycle matters because the right defensive posture depends on the campaign’s stage:

• In the early stages, before active examinations, the priority is positioning — reviewing existing structures against the Childs framework, identifying structural features that materially deviate from it, and considering whether modifications, unwinds, or other proactive steps are warranted.
• As field agents complete training and examinations begin, the priority shifts toward defense readiness — understanding what an LB&I examination of these structures will actually look like, what Information Document Requests the agency is likely to issue, and how the audit will be developed against the framework set out in AM 2022-007 and applied through the lens of Childs.
• Once examinations are active, the priority is execution — defending the specific structure on the specific facts, with the case file built from day one for what comes next at Appeals or in U.S. Tax Court.

The May 2026 Tax Notes reporting suggests the campaign is moving out of stage one and into stage two. For practitioners and law firms with deferred legal fee structures in place — or contemplating them — that transition is the moment when proactive review is most valuable.

How Kugelman Law Approaches These Matters

Kugelman Law advises tax practitioners, law firms, and high-net-worth taxpayers on the full lifecycle of federal tax controversy matters — from pre-controversy structural review through IRS examination defense and, where necessary, U.S. Tax Court litigation. The firm’s combination of capabilities is structured deliberately for matters like this one.

Founder Alex Kugelman brings nearly two decades of federal tax controversy experience, including litigation in U.S. Tax Court and U.S. District Court. Otto Bosch brings the inside-the-IRS perspective from his time as a Revenue Agent in the LB&I Global High Wealth Group — the specialized unit that examines the most complex returns of the wealthiest U.S. taxpayers. We covered the strategic value of this combination in detail in our article on why a former IRS revenue agent attorney changes audit defense, and the underlying examination dynamics in our pieces on what IRS Revenue Agents do and inside the IRS audit playbook.

For practitioners with deferred legal fee structures, the practical question is whether the structure sits comfortably inside Childs, whether any structural elements would be characterized by an LB&I examiner as materially deviating from Childs, and what — if anything — should be done before active examinations begin.

Speak With Kugelman Law

If you advise on or use deferred legal fee structures, or if you have any other complex federal tax controversy matter you would like to discuss, schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

Read the full Tax Notes article: “More Scrutiny of Deferred Legal Fee Structures Could Be Coming” by Lauren Loricchio (Tax Notes, May 26, 2026). Subscription required.

About the Author

Alex Kugelman is the founder and managing attorney of Kugelman Law, a boutique tax controversy and cryptocurrency tax firm serving California and clients nationwide. With nearly two decades of federal tax controversy experience — including litigation in the U.S. Tax Court and U.S. District Court — Alex represents individuals and businesses in their most consequential disputes with the IRS and the California Franchise Tax Board. He is a member of the State Bar of California (No. 255463), admitted to the Bar of the U.S. Supreme Court, and served as San Francisco Chair of the Federal Bar Association’s Tax Division in 2018. He is also a member of the Marin County Assessment Appeals Board and a nationally recognized cryptocurrency tax attorney featured on the Bitcoin.tax podcast and The Mark Milton Show. Read Alex’s full bio.

If you have received an IRS audit notice — or you are worried one might be coming — one of the first questions worth answering is who, exactly, will be examining your return. The answer matters more than most taxpayers realize. The IRS is not a single, undifferentiated organization. Examinations are conducted by specific employees with specific titles, training, and authority — and the most consequential examinations are handled by a particular kind of IRS employee called a Revenue Agent.

So what does an IRS revenue agent do? In short: a Revenue Agent is the IRS employee assigned to conduct in-depth examinations of complex tax returns, develop adjustments, and build the case file the agency relies on at every stage of dispute resolution. A Revenue Agent’s findings become the basis for proposed assessments, penalties, and — if the case escalates — the record that follows the matter into Appeals or U.S. Tax Court.

This article walks through the role of an IRS Revenue Agent from the inside: how cases are selected, what an examination actually looks like step by step, how internal IRS review works, and what taxpayers should understand before responding to the first contact letter. The perspective is informed by Kugelman Law attorney Otto Bosch, who served as a Revenue Agent in the IRS Global High Wealth Group within the Large Business and International (LB&I) Division before joining the firm in February 2026.

What Is an IRS Revenue Agent?

A Revenue Agent is a credentialed IRS employee whose job is to conduct examinations of tax returns. Most Revenue Agents have backgrounds in accounting and have completed extensive in-house IRS training in tax law, examination procedure, and case development. They are professionals, not paper-pushers, and the cases they handle are generally the cases the IRS has decided are worth investing real examination resources in.

Revenue Agents work civilly. That is, they are not criminal investigators (those are Special Agents within IRS Criminal Investigation, or IRS-CI). But Revenue Agents do conduct what the IRS calls eggshell and reverse-eggshell audits — civil examinations that may have parallel or downstream criminal implications — and they are trained to recognize the badges of fraud and to coordinate with IRS-CI when appropriate.

The Revenue Agent’s authority during an examination is significant. They can issue Information Document Requests (IDRs), conduct interviews, summon third-party records under appropriate procedures, propose adjustments, and recommend penalties. What they cannot do alone is impose a final tax liability — that comes through the formal notice procedures and, if contested, through Appeals or the courts.

How IRS Revenue Agents Are Different from Other IRS Personnel

One of the most common sources of confusion for taxpayers is conflating different IRS roles. Three roles in particular are routinely mistaken for one another:

• Revenue Agents conduct civil audits of tax returns. They are accountants who develop adjustments to taxes owed.
• Revenue Officers collect taxes that have already been assessed. They handle levies, liens, wage garnishments, and the negotiation of installment agreements and offers in compromise.
• Special Agents are criminal investigators within IRS-CI. They build criminal tax fraud, money laundering, and related cases for prosecution.

Each role uses different procedures, requires different defensive strategies, and presents different risks. Knowing which IRS employee you are dealing with is the first step in any tax controversy. If a Revenue Officer is on your matter, the assessment phase is over and the focus has shifted to collections defense. If a Special Agent shows up, civil strategy is no longer the right framework. If a Revenue Agent is conducting your audit, the case is in the development phase — and how that development is managed will define the outcome.

How a Return Lands on a Revenue Agent’s Desk

Returns reach Revenue Agents through several distinct paths, and the path matters because it tells the agent — and an experienced defense team — something about the IRS’s interest in the case.

DIF scoring. The Discriminant Function (DIF) system is a statistical model the IRS uses to score returns for audit potential. High-DIF returns are flagged for review and routed for selection. Most ordinary audits begin this way.

Related-return pickups. When a Revenue Agent is examining one return and finds issues that connect to another taxpayer’s return — a partnership and a partner, a corporation and a shareholder, related entities under common ownership — the related return can be opened for examination as well. This is one reason a single audit can quickly grow into multiple coordinated examinations.

Information matching. The IRS receives extensive third-party information — W-2s, 1099s, K-1s, foreign account reports, broker reports, cryptocurrency exchange disclosures — and matches that data against filed returns. Material mismatches generate notices, and significant mismatches can escalate into a full examination.

Compliance projects and initiatives. The IRS regularly runs enforcement initiatives focused on specific issues — syndicated conservation easements, microcaptive insurance arrangements, cryptocurrency reporting, foreign account compliance, and employee retention credit claims, among others. Returns within the scope of an active initiative are far more likely to be selected.

Whistleblower and informant referrals. The IRS Whistleblower Program pays awards for actionable information about tax noncompliance, and substantiated referrals can result in examination.

Global High Wealth and LB&I selection. For the most complex high-net-worth and corporate examinations, returns are selected through specialized risk-based processes within LB&I, including the enterprise-level approach used by the Global High Wealth Group.

The path of selection often shapes the contour of the examination. A DIF-selected return is usually examined for the issues that drove the score. A related-return pickup tends to focus on the connecting transactions. A project-driven examination is concentrated on the specific issue the project is targeting. Recognizing which is which is one of the things a former IRS revenue agent attorney brings to a defense team from day one.

The Anatomy of an IRS Audit from a Revenue Agent’s Perspective

When a Revenue Agent is assigned a case, the examination unfolds along a fairly predictable arc. Understanding that arc — and the agent’s internal incentives at each stage — is essential to responding effectively.

Pre-Contact and Initial Review

Before the agent ever contacts the taxpayer, the case goes through pre-contact analysis. The agent reviews the return, analyst notes, prior-year returns, and any third-party data already on file. They develop a preliminary issue list — the things they expect to examine — and identify the documents they will need. By the time the audit notice arrives in the mail, the agent has already formed initial views about the case. Sophisticated taxpayers (and sophisticated defense counsel) plan around that reality.

The Opening Conference and First Information Document Request

The first formal contact is generally a notice of examination followed by an opening conference (in person, by telephone, or virtually). At or shortly after the opening conference, the agent issues an initial Information Document Request — the IDR — listing documents and information needed to proceed.

The first IDR is one of the most important documents in the entire examination. It defines the initial scope, signals what the agent considers most important, and frames every subsequent issue. Responses to the first IDR generate the second IDR, which is often where the audit’s actual depth becomes visible. Taxpayers who treat the first IDR as routine paperwork frequently regret it.

Issue Development and Fieldwork

This is the heart of the examination. The agent reviews documents, conducts interviews, examines books and records, and develops each issue toward a recommended adjustment. Within LB&I, this stage often involves multiple specialists — international examiners, computer audit specialists, engineers, financial product experts — coordinating on technical questions. Within the Global High Wealth Group, the entire enterprise of related entities and transactions is considered together rather than examined return by return.

During fieldwork, the agent is not only developing issues but also building the workpapers — the internal documentation that will support each adjustment through supervisor review, Appeals, and any subsequent litigation. That workpaper file is the case. Whatever is in it is what the IRS will rely on later. Whatever is not in it is what the taxpayer can challenge.

Internal Review, Supervisor Sign-Off, and Counsel Coordination

Revenue Agents do not act alone. Throughout an examination, supervisors review the agent’s work, push back on weak positions, and approve significant decisions. For complex issues, IRS Counsel may be involved to provide legal advice on questions the examination cannot resolve internally. Aggressive penalties, fraud referrals, summons enforcement, and other escalations all run through layered approval processes.

This internal architecture creates leverage points for the defense. A position the agent personally favors but the manager is reluctant to defend is a different position than one with full institutional backing. Recognizing the difference — and knowing where to apply pressure — is the kind of insight that comes from having been on the inside.

Closing the Case

Examinations close in one of three general ways. A “no-change” closing means the agent did not find adjustments and the return is accepted as filed. An “agreed” closing means the taxpayer accepts the proposed adjustments (typically by signing Form 870 or similar), the deficiency is assessed, and collections begin if amounts are owed. An “unagreed” closing means the taxpayer contests the proposed adjustments, the agent issues a Revenue Agent’s Report and a 30-day letter, and the case proceeds to Appeals — and ultimately, if necessary, to U.S. Tax Court following a statutory notice of deficiency.

How a case closes is heavily influenced by how it was developed during fieldwork. Cases that are positioned correctly during the examination tend to close cleanly. Cases that are mishandled tend to close badly — with assessments larger than they needed to be, penalties that should not have applied, or records that handicap any subsequent appeal.

Where IRS Revenue Agents Work: SB/SE, LB&I, and Global High Wealth

Not all Revenue Agents are equivalent. The IRS organizes its examination function into divisions, and the division handling a particular case tells you a great deal about the agency’s interest and approach.

Small Business / Self-Employed (SB/SE). This is the largest examination division by case volume. SB/SE Revenue Agents handle most individual and small-business audits — Schedule C examinations, smaller partnership audits, closely held business reviews, and a wide range of personal income tax matters.

Large Business and International (LB&I). LB&I handles the more complex side of corporate, partnership, and high-net-worth examinations. LB&I cases tend to involve higher stakes, more specialists, longer timelines, and significantly more sophistication in issue development.

Global High Wealth Group. Within LB&I, the Global High Wealth Group is the most specialized of all — the team that examines the most complex returns of the wealthiest U.S. taxpayers. Global High Wealth uses an enterprise audit approach, looking at the full web of related entities, trusts, partnerships, and personal returns as an integrated whole. Adjustments developed under that approach can surface issues that would be invisible in a return-by-return examination.

For taxpayers facing a Global High Wealth or LB&I examination, the importance of insider perspective is at its highest. The procedures, specialists, internal review processes, and risk calculus inside that group are not visible from the outside. This is precisely the perspective Otto Bosch brings to every Kugelman Law audit defense matter.

What This Means for You as a Taxpayer Under Audit

Two practical implications follow from understanding how Revenue Agents actually work.

First, the early stages of an examination are the most consequential. By the time the case reaches Appeals or court, much of the record is already fixed. Decisions made in responding to the first IDR, in handling the opening conference, in giving (or not giving) interviews, and in producing (or not producing) documents shape the case in ways that cannot be undone later. Audit defense begins with the first contact letter, not with the 30-day letter.

Second, who is on the other side of the table matters. A Revenue Agent in SB/SE conducting a routine Schedule C audit operates very differently than a Global High Wealth team conducting a coordinated enterprise examination. Defense strategy should match the examination — and that match starts with correctly identifying who is examining you and why.

These are the considerations that drive how Kugelman Law approaches every audit defense matter. With founder Alex Kugelman‘s nearly two decades of federal tax controversy and U.S. Tax Court litigation experience and Otto Bosch‘s direct background as a former Revenue Agent in the IRS Global High Wealth Group, the firm pairs federal litigation capability with inside-the-IRS examination experience — a combination most controversy practices simply cannot offer.

Representative outcomes from the firm’s controversy practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

Frequently Asked Questions

What is the difference between an IRS Revenue Agent and an IRS auditor?

“IRS auditor” is a colloquial term that taxpayers use to describe anyone at the IRS conducting an examination. Inside the agency, the more precise terms are Tax Compliance Officer (TCO) — who handles less complex office and correspondence audits — and Revenue Agent, who handles more complex field examinations. Revenue Agents are the personnel who handle the substantive cases.

How long does an IRS Revenue Agent audit take?

Audit length varies dramatically depending on complexity. A focused single-issue examination may close in a few months. A complex partnership or high-net-worth examination, particularly one conducted through the Global High Wealth Group, can take a year or more. Length is also affected by responsiveness, the number of specialists involved, and whether the case is escalated to Appeals.

Do IRS Revenue Agents have authority to assess penalties?

Yes. Revenue Agents can propose accuracy-related penalties, late-filing and late-payment penalties, and in appropriate cases, civil fraud penalties. Penalty assessments generally require supervisory approval and are subject to challenge through Appeals and the courts. Penalty defense is a meaningful component of any sophisticated audit defense.

Can I refuse to meet with an IRS Revenue Agent?

You can decline to be personally interviewed and have your representative communicate with the agent on your behalf in most circumstances. There is rarely a strategic reason for an unrepresented taxpayer to sit for an unprepared interview with a Revenue Agent. The right approach is to retain a tax controversy attorney before any interview takes place.

What happens if I disagree with the Revenue Agent’s findings?

If the examination ends in proposed adjustments you disagree with, you can request a conference with the agent’s manager, file a formal protest with the IRS Independent Office of Appeals, and ultimately litigate the deficiency in U.S. Tax Court (after a statutory notice of deficiency) or in U.S. District Court or the Court of Federal Claims (after paying the deficiency and filing a refund claim). The path that fits your situation depends on the specific facts.

Speak With Kugelman Law

If a Revenue Agent has opened an examination of your return — or you have reason to believe one is coming — schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.

Most taxpayers who receive an IRS audit notice make the same first call: their CPA. A few call a tax attorney. Almost none think to ask a more useful question — does the firm I’m hiring have anyone on the team who has actually sat on the other side of the audit table?

A former IRS revenue agent attorney is one of the rarest and most strategically valuable assets a tax controversy firm can put on a client matter. When the IRS examination team across the table is trained, equipped, and incentivized to develop adjustments against you, the single most important advantage you can secure is a defense team that includes someone who was trained inside that same playbook.

At Kugelman Law, that advantage is now part of every audit defense the firm handles, in the form of attorney Otto Bosch — a former Revenue Agent from the IRS Global High Wealth Group.

This article explains exactly what a Revenue Agent does, why an inside-the-IRS perspective changes the outcome of an audit defense, and how clients of Kugelman Law benefit from a team built around that distinction.

What an IRS Revenue Agent Actually Does

“IRS auditor” is a generic term most taxpayers use, but inside the agency, examination roles are highly specialized. A Revenue Agent is the IRS employee assigned to conduct in-depth examinations of tax returns — particularly the complex ones. Revenue Agents are not call-center employees, and they are not the people who issue automated correspondence notices about a missing 1099. They are accountants, often with advanced training and credentials, whose job is to dig into a return, identify issues, and develop adjustments the IRS can defend at every escalation point.

A Revenue Agent’s day-to-day work includes:

• Reviewing returns flagged by the IRS’s Discriminant Function (DIF) scoring system or selected through specific enforcement initiatives
• Issuing Information Document Requests (IDRs) and analyzing what taxpayers and representatives produce in response
• Conducting interviews with taxpayers, representatives, and third parties
• Building case files and workpapers that support each proposed adjustment
• Coordinating with IRS Counsel and supervisory managers on technical and procedural questions
• Issuing Notices of Proposed Adjustment and, ultimately, the formal Revenue Agent’s Report

Inside the IRS, agents are organized by division. The Small Business / Self-Employed (SB/SE) division handles most individual and small-business audits. The Large Business and International (LB&I) division handles corporate, partnership, and high-net-worth examinations. Within LB&I, the Global High Wealth Group is the most specialized of all — the team that audits the country’s wealthiest taxpayers using a coordinated, enterprise-level approach to complex pass-through structures, related-party transactions, and high-value individual portfolios.

That is the team Otto Bosch served on before joining Kugelman Law.

Why a Former IRS Revenue Agent Attorney Changes Audit Defense

There is a meaningful difference between knowing the tax code and knowing how the IRS uses it. Most tax attorneys learn the IRS from the outside — through court opinions, published guidance, and accumulated experience reading agency notices. A former IRS revenue agent attorney learns it from the inside, through formal IRS training, supervised casework, and the institutional knowledge of how examinations are actually run.

That insider perspective shifts audit defense in three concrete ways.

Anticipating What the IRS Will Do Next

A standard audit defense is reactive. The IRS asks; the taxpayer responds. The agent develops the next issue; the attorney scrambles to address it. A defense informed by inside-the-IRS experience is anticipatory. Former Revenue Agents know which issues an examination team is trained to develop, which questions on an early IDR are setting up future adjustments, and which client statements during interviews tend to escalate cases rather than close them. That foresight allows the defense to prepare positions, marshal documentation, and structure responses before the IRS asks — not after.

Reading the IRS’s Internal Risk Calculus

Revenue Agents are not free agents. They work within strict supervisory review processes, technical advice channels, and internal pressure to close cases efficiently. Every decision an agent makes — whether to escalate an issue, whether to push for a fraud penalty, whether to settle or take a position to Appeals — is filtered through that institutional risk calculus. A former Revenue Agent attorney can read those signals. They know when an agent is genuinely committed to a position versus when the agent is fishing for support, when a manager is likely to overrule an aggressive line of inquiry, and when to push for resolution at the examination level versus when to position the case for Appeals or U.S. Tax Court.

Recognizing the Difference Between a Routine Audit and an Eggshell Audit

Some audits are administrative exercises. Others are the early stages of a fraud investigation. The line between them is not always obvious to taxpayers, or even to attorneys without controversy experience — but it is recognizable to a former Revenue Agent. The badges of fraud, the pattern of questioning, the involvement of certain specialists, the timing of certain document requests — these all carry meaning from the inside. Misreading that line is one of the most expensive mistakes a taxpayer can make. Volunteering information to “look cooperative” in what turns out to be an eggshell audit can convert civil exposure into a criminal referral. Insider perspective is what prevents that mistake.

The Specific Advantages an IRS Insider Brings to Your Case

Distilled to a working list, here is what changes when a former IRS revenue agent attorney is part of a client’s defense team:

• Predicting the audit scope. Knowing what an agent’s first IDR will likely contain, and what the second and third will probably address, allows the defense to prepare on the right timeline rather than catching up after the fact.
• Managing IDR responses strategically. IDRs are not innocent paperwork. The information provided in response — and the information not provided — frames every subsequent issue. Insider experience shapes responses that satisfy the request without volunteering exposure.
• Identifying weak IRS positions early. Not every adjustment an agent proposes is a strong adjustment. Knowing which positions are routinely overturned at Appeals, and which positions managers are reluctant to defend, allows the defense to push back where pushing back actually works.
• Avoiding self-inflicted escalation. Many of the worst audit outcomes are caused by missteps the taxpayer or unprepared representative made early — improvised statements during an interview, careless document production, or unnecessary disclosures. A former Revenue Agent recognizes those traps before they spring.
• Speaking the agent’s language. Audits are negotiations as much as they are technical exercises. An attorney who can speak fluently about IRS workpapers, internal review timelines, and statutory procedural requirements from the agent’s own perspective tends to find a more reasonable counterparty on the other side of the table.
• Building a clean record for what comes next. If a case advances to Appeals or to U.S. Tax Court litigation, the record built during the examination is what the case is ultimately decided on. Insider experience shapes that record from day one for what comes after.

Meet Otto Bosch — Kugelman Law’s Former IRS Global High Wealth Agent

The advantages above are not abstract for Kugelman Law clients. They are embodied in the firm’s attorney Otto Bosch, who joined the firm in February 2026 after serving as a Revenue Agent in the IRS Global High Wealth Group within the Large Business and International (LB&I) Division.

The Global High Wealth Group is the IRS’s specialized unit for examining the most complex returns of the wealthiest U.S. taxpayers. Within that group, Otto worked Information Document Requests, Notices of Proposed Adjustment, partnership compliance issues, related-party transactions, hobby loss disputes, and the layered portfolio-level adjustments that define high-net-worth examinations. He led issue meetings with taxpayers and audit teams, served as the intermediary with IRS Counsel, and developed and resolved more than a dozen high-value adjustments using the enterprise audit approach unique to that group.

He also brings experience from KPMG’s Washington National Tax practice — the elite technical group at one of the Big Four — where he advised national and multinational clients on complex partnership and S-corporation transactions. He holds an LL.M. in Taxation with a focus on Partnership Tax, is an IRS Enrolled Agent, and is fluent in Spanish.

For Kugelman Law clients, Otto’s role is to bring that combined background to the defense of every audit, controversy, and high-stakes federal tax matter the firm handles.

When the IRS Insider Advantage Matters Most

Not every tax matter requires a former Revenue Agent. A simple correspondence audit on a missing 1099 generally does not. But the insider advantage becomes decisive in cases where the IRS is investing real examination resources, the technical issues are complex, or the financial stakes are significant. That includes:

• High-net-worth examinations, particularly those conducted under the Global High Wealth enterprise approach
• Partnership and S-corporation audits, where pass-through complexity, related-party transactions, and basis questions create high-leverage positions for either side
• Cryptocurrency tax audits, where the IRS is rapidly building enforcement infrastructure and where insider perspective on how agents are being trained to approach digital assets is invaluable
• Eggshell audits and audits with potential fraud exposure, where misreading the IRS’s posture can transform civil exposure into criminal risk
• Multi-year non-filing matters and offshore disclosure cases, where the order in which issues are surfaced and resolved meaningfully affects the outcome
• Aggressive collections matters, where understanding the IRS’s collections playbook from the inside changes how levies, liens, and resolution alternatives are negotiated

In each of these scenarios, the difference between a competent defense and a strategic defense is often the difference between paying a six-figure assessment and paying nothing.

How Kugelman Law Pairs IRS Insider Experience With Federal Tax Litigation

Otto Bosch’s background is the newest layer of the firm’s audit defense capability — but it sits on top of nearly two decades of federal tax controversy experience under founder Alex Kugelman, who has litigated in U.S. Tax Court and U.S. District Court and built one of the country’s earliest dedicated cryptocurrency tax practices.

That pairing matters. A former IRS Revenue Agent on the team gives clients the insider’s view of how a case is being built. A senior tax controversy litigator gives clients the credible threat of taking the case to court if it cannot be resolved administratively. Most firms can offer one or the other. Few offer both. The result, for Kugelman Law clients, is an audit defense posture that is informed at the examination level by IRS-insider experience and backstopped at every escalation point by federal court litigation capability.

Representative outcomes from the firm’s controversy practice include a $365,000 tax debt reduced to a zero-dollar liability, a multi-year audit and non-filing matter resolved with minimal payment, and ten years of unfiled returns brought into compliance with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

Frequently Asked Questions

What is a former IRS revenue agent attorney?

A former IRS revenue agent attorney is a licensed lawyer who previously worked as a Revenue Agent for the Internal Revenue Service before entering private practice. Their value lies in combining legal credentials with direct, inside-the-IRS experience conducting examinations — knowledge that informs how they defend audits, controversies, and tax court matters in private practice.

Is hiring a former IRS Revenue Agent legal and ethical?

Yes. Former IRS employees can enter private practice in tax, subject to well-defined post-employment restrictions that prohibit working on specific matters they were personally and substantially involved in while at the agency. Those rules are routinely complied with by former agents in private practice and do not limit their ability to defend the great majority of audits, controversies, and litigation matters.

How is a former IRS Revenue Agent different from a CPA in audit defense?

A CPA can represent taxpayers before the IRS, but does not have the same legal training, attorney-client privilege protection, or litigation authority as an attorney. A former IRS Revenue Agent who is also a licensed attorney combines all three: technical accounting depth, inside-the-IRS examination experience, and full legal authority including privilege and the ability to litigate in U.S. Tax Court and federal district court.

Does Kugelman Law represent clients outside of California?

Yes. Federal tax controversy work — including IRS audits, U.S. Tax Court litigation, and offshore disclosure matters — is handled for clients nationwide. The firm is based in Marin County with offices in San Francisco and Irvine, and all representation is provided remotely.

What does a paid privileged consultation include?

A paid privileged consultation is a confidential, attorney-client privileged conversation with Kugelman Law about the specifics of a tax matter. Unlike free consultations offered by many firms, the paid model allows for substantive legal advice during the consultation itself — including a candid assessment of the matter, the firm’s recommended strategy, and a clear scope of representation if the client decides to engage.

Speak With Kugelman Law

If you are facing an IRS or FTB audit, a tax controversy, or a complex federal tax matter where insider perspective on the IRS would change your defense, schedule a paid privileged consultation with Kugelman Law. Call (415) 968-1780 or visit our contact page. All consultations are fully protected by attorney-client privilege.