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.

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.