Understanding the stages of an IRS crypto audit is the single most useful thing a taxpayer under examination can do. Each stage has its own rules, its own deadlines, and its own strategic opportunities.

Missing a deadline or misjudging a stage can cost you settlement leverage, appeal rights, or in the worst cases, the ability to challenge the IRS’s position in court at all.

Kugelman Law represents cryptocurrency investors, traders, and businesses in IRS examinations nationwide. This guide walks through the full procedural arc of a federal cryptocurrency audit — from the opening notice through potential U.S. Tax Court litigation — and identifies the decision points where experienced representation changes the outcome.

Why Crypto Audits Follow a Predictable Procedural Path

Federal tax audits, including cryptocurrency audits, are governed by the Internal Revenue Manual, the Internal Revenue Code, and decades of IRS procedural practice. The IRS does not improvise the structure of an audit. It follows a defined sequence of steps, and understanding that sequence gives a prepared taxpayer meaningful strategic advantages. The crypto-specific wrinkles — blockchain forensics, cost basis reconstruction, DeFi and NFT treatment, foreign exchange issues — layer on top of this standard procedural framework.

What follows is the typical sequence for a civil cryptocurrency audit. Criminal investigations follow a different (and far more serious) path and are outside the scope of this article.

Stage 1: The Opening Notice

The audit begins with a letter. For individual cryptocurrency taxpayers, this is typically either a CP2000 notice (for mismatch-driven correspondence audits), Letter 2205 (for office or field audits), or Letter 6173 / 6174 / 6174-A (the crypto-specific “soft letters” the IRS has used to prompt voluntary compliance). Business entities may receive Letter 2205-B.

The opening notice identifies the tax years under examination, the issues to be examined, the examiner assigned, and whether the audit is a correspondence audit (handled by mail), an office audit (conducted at an IRS office), or a field audit (conducted at the taxpayer’s business or representative’s office).

Strategic opportunity at this stage: The opening notice is the best time to engage tax counsel. A Form 2848 Power of Attorney filed promptly routes all communications through your attorney, establishes attorney-client privilege over your audit strategy, and signals to the examiner that the file will be handled professionally. Taxpayers who wait until the audit is already in motion give up meaningful leverage.

Stage 2: The Initial Interview and Scope Setting

In office and field audits, the examiner will typically request an initial interview, either in person or by telephone. For cryptocurrency cases, the examiner uses this interview to understand the taxpayer’s crypto activity at a high level — what exchanges they used, whether they self-custodied, whether they engaged in mining, staking, DeFi, or NFT transactions, and whether foreign exchanges or wallets are involved.

This interview shapes the scope of the entire audit. Answers given here are difficult to walk back later. In our experience, taxpayers who attempt to handle the initial interview on their own almost always volunteer information the examiner had no independent way to obtain — and that volunteered information often becomes the basis for expanded audit scope.

What a tax attorney does at this stage: We typically attend (or handle) the initial interview on the client’s behalf, limit the scope to what is strictly relevant to the stated audit issues, and establish a document production protocol with the examiner that protects privilege and controls the pace of the examination.

Stage 3: Information Document Requests (IDRs)

The IDR is the workhorse of any crypto audit. Issued on Form 4564, an Information Document Request lists specific records the examiner wants and sets a deadline (typically 15 to 30 days) for response. In a cryptocurrency audit, IDRs commonly demand wallet addresses, exchange statements, cost basis documentation, DeFi and NFT records, foreign exchange activity, and communications with tax preparers.

Crypto audits typically involve multiple rounds of IDRs. The examiner reviews the initial response, identifies follow-up questions, and issues additional IDRs. Each round is an opportunity to narrow scope, establish favorable facts, and frame the narrative — or, handled poorly, to compound the examiner’s concerns.

We’ve written a separate in-depth guide on IRS IDRs in crypto audits because this stage is consequential enough to warrant its own treatment. At a high level, the key is that IDR responses are not document dumps — they are strategic communications that become part of the administrative record for any subsequent appeal or litigation.

Stage 4: Proposed Adjustments and the Examination Report

Once the examiner has gathered the records they consider sufficient, they prepare an examination report (generally Form 4549 for individual income tax adjustments or Form 5701 for notices of proposed adjustment). This report lists each proposed change to the return and calculates the resulting tax, interest, and penalty exposure.

In crypto audits, the most common proposed adjustments include recharacterization of transactions as taxable events the taxpayer did not report, reassignment of cost basis (often to zero, absent defensible records), reclassification of ordinary versus capital gain treatment, and the assertion of accuracy-related penalties under IRC Section 6662. FBAR and foreign information return penalties may be layered on where offshore exchange activity is involved.

The taxpayer has an opportunity to respond to the proposed adjustments before the report is finalized. This is not a token exercise. A well-crafted response, supported by reconstructed records and legal authority, frequently causes examiners to drop or reduce proposed adjustments before they ever leave the examination desk.

Stage 5: The 30-Day Letter and Protest to IRS Appeals

If the taxpayer and examiner cannot reach agreement at the examination level, the IRS issues a 30-day letter. This letter transmits the examination report and offers the taxpayer 30 days to file a written protest requesting review by the IRS Independent Office of Appeals.

IRS Appeals is procedurally and functionally independent from examination. Appeals officers have broader settlement authority than examiners and are instructed to weigh the “hazards of litigation” — meaning the likelihood that the IRS would lose all or part of its position in court. For crypto audits, where the law is still developing and where reasonable minds disagree on treatment of many transactions, the hazards-of-litigation standard often produces meaningful settlement movement.

A well-drafted protest is a consequential document. It states the facts, identifies the disputed adjustments, sets out the taxpayer’s legal position with authority, and presents the matter in a way that makes settlement attractive to the Appeals officer. This is an area where nearly two decades of federal tax controversy experience produces visibly different results than generic audit representation.

Important deadline: The 30-day response period is firm. Missing it forfeits the administrative appeal and typically accelerates the case toward a statutory notice of deficiency.

Stage 6: IRS Appeals Conference

If a protest is timely filed, the case is assigned to an Appeals officer who will schedule a conference. These conferences are generally informal and can be held by telephone, video, or in person. The Appeals officer reviews the administrative file, considers the protest and any supplemental submissions, and engages with the taxpayer’s representative to explore settlement.

In our experience, Appeals is often where crypto audits resolve. The Appeals officer’s independence, combined with broader settlement authority and the hazards-of-litigation framework, creates meaningful room to negotiate outcomes that examination would not offer. Matters that seem frozen at the examination level frequently move significantly at Appeals.

Settlement at Appeals is typically memorialized in a Form 870-AD (Offer of Waiver of Restrictions on Assessment and Collection of Deficiency in Tax and of Acceptance of Overassessment) or a closing agreement. Once signed, the matter is resolved and the tax is assessed according to the agreement.

Stage 7: The 90-Day Letter (Statutory Notice of Deficiency)

If Appeals does not resolve the case — or if the taxpayer did not protest to Appeals at the 30-day letter stage — the IRS issues a statutory notice of deficiency, commonly called a 90-day letter. This is a formal determination that triggers one of the most important deadlines in federal tax practice.

The taxpayer has 90 days from the date of the notice (150 days if the notice is addressed to a person outside the United States) to file a petition in U.S. Tax Court. If no petition is filed within the statutory period, the deficiency becomes final, the tax is assessed, and the taxpayer loses the right to contest the liability in Tax Court. At that point, the only remaining forum is to pay the tax and sue for refund in U.S. District Court or the Court of Federal Claims — a much more expensive and procedurally cumbersome path.

The 90-day deadline is jurisdictional. No extensions. No exceptions. A petition filed on day 91 is dismissed for lack of jurisdiction, full stop. If you have received a statutory notice of deficiency from a crypto audit, engage qualified tax counsel immediately — not next week.

Stage 8: U.S. Tax Court Petition and Litigation

Filing a timely Tax Court petition preserves the taxpayer’s right to challenge the IRS’s determination without first paying the tax. Tax Court is a specialized federal court with judges who exclusively hear tax cases. Cases can be designated as “small tax cases” (for deficiencies under $50,000 per year, with simplified procedures) or as regular Tax Court cases.

Filing a petition does not commit the case to trial. In practice, the majority of Tax Court cases settle before trial, often through IRS Counsel or a second trip to Appeals. The filing itself, however, preserves the taxpayer’s position and creates new settlement dynamics.

If the case proceeds to trial, the taxpayer presents evidence, calls witnesses, and argues the law before a Tax Court judge. For cryptocurrency cases, this may involve expert testimony on blockchain forensics, cost basis methodology, and technical characterization of DeFi or staking transactions.

Alex Kugelman is admitted to practice before the U.S. Tax Court and the U.S. Supreme Court, and has represented clients in U.S. Tax Court and U.S. District Court tax litigation. Our firm handles crypto audit matters through every stage, including trial, on a nationwide basis.

Stage 9: Assessment and Collection

Once the audit is fully resolved — by settlement, decision, or default — the IRS assesses the tax and begins collection. If the liability is not paid, the matter transitions from the examination side of the IRS to the collection side, and a different set of procedural rules governs. Options at that point include installment agreements, offers in compromise, currently not collectible status, and challenges through the Collection Due Process (CDP) procedure.

Collection defense is a distinct practice area. For resources on that phase, see our tax collections page.

Typical Timeframes and Realistic Expectations

Most federal cryptocurrency audits take 12 to 24 months from opening notice to resolution at the examination or Appeals level. Complex matters involving multiple years, DeFi or NFT activity, or foreign exchanges can run longer. Cases that proceed to Tax Court typically add another 12 to 24 months, though many settle before trial.

In matters we have handled, a $365,000 proposed tax debt was reduced to a zero-dollar liability, a multi-year audit and non-filing matter was resolved with minimal payment, and ten years of unfiled returns were resolved with a successful outcome. Results depend on specific facts. Past results do not guarantee future outcomes.

Why the Early Stages Matter Most

If there is one takeaway from this procedural walkthrough, it is this: the earlier in the audit you engage experienced tax counsel, the more options you preserve. Scope set at Stage 2 constrains the examination. Records produced at Stage 3 shape the administrative record for every subsequent stage. A protest filed at Stage 5 determines whether Appeals will even hear the case. A petition filed at Stage 7 determines whether Tax Court has jurisdiction.

By the time a taxpayer reaches Stage 8, many of the most favorable strategic decisions are already behind them. The best time to engage counsel is at Stage 1.

Nationwide Representation for Every Stage of a Crypto Audit

Federal cryptocurrency audits are federal matters, and Kugelman Law represents clients throughout the United States. Alex Kugelman is admitted to the U.S. Supreme Court and has nearly two decades of federal tax controversy experience, including U.S. Tax Court and U.S. District Court litigation. Our cryptocurrency specialization has been featured on the Bitcoin.tax podcast and The Mark Milton Show. Wherever you are located, if you are facing an IRS crypto audit, we can represent you at every stage.

Frequently Asked Questions About the Stages of a Crypto Audit

How long does an IRS cryptocurrency audit take?

Most crypto audits take between 12 and 24 months from opening notice to resolution, though complex matters involving multiple years, DeFi activity, or foreign exchanges can take longer. Matters that proceed to IRS Appeals or U.S. Tax Court extend further.

What is the difference between a 30-day letter and a 90-day letter?

A 30-day letter proposes adjustments at the close of examination and invites a protest to IRS Appeals. A 90-day letter, or statutory notice of deficiency, is a formal determination that gives the taxpayer 90 days to petition U.S. Tax Court or the deficiency becomes final and assessable.

Can I settle a crypto audit without going to court?

Most crypto audits are resolved at the examination or Appeals stage without litigation. IRS Appeals offers an independent review and broader settlement authority than examination. Litigation in U.S. Tax Court is always an option if Appeals does not reach a reasonable result.

When should I hire a tax attorney in a crypto audit?

Earlier is almost always better. Engaging counsel at the opening notice or first Information Document Request stage preserves strategic options, establishes attorney-client privilege, and often changes the trajectory of the entire audit.

Does the IRS audit cryptocurrency investors nationwide?

Yes. The IRS audits cryptocurrency taxpayers throughout the United States. The examination division uses blockchain analytics, exchange reporting, and John Doe summons data to identify audit candidates regardless of geography.

Under Audit? Engage Counsel at the Right Stage.

The earlier you engage experienced tax counsel, the more strategic options remain open. Kugelman Law offers paid, privileged consultations with founder Alex Kugelman — fully protected by attorney-client privilege — at any stage of a cryptocurrency audit, from opening notice through U.S. Tax Court.

Call (415) 968-1780 or contact Kugelman Law to schedule your consultation.

About the Author

Alex Kugelman is the Founder and Managing Attorney of Kugelman Law, a boutique tax controversy and cryptocurrency tax law firm representing clients nationwide. He is admitted to the California Bar (2008, No. 255463) and the U.S. Supreme Court, and is a member of the American Bar Association, the California State Bar, and the Federal Bar Association, where he served as San Francisco Chair of the FBA Tax Division in 2018. Alex also serves on the Marin County Assessment Appeals Board. He holds a J.D. from Chapman University Fowler School of Law (2007) and a B.A. in English Literature from the University of Colorado at Boulder (2001).

With nearly two decades of federal tax controversy experience — including U.S. Tax Court and U.S. District Court litigation — Alex is nationally recognized for his cryptocurrency tax specialization and has been featured on the Bitcoin.tax podcast and The Mark Milton Show.

Related Kugelman Law Resources

• Cryptocurrency Accounting & Audits
• Tax Audits
• U.S. Tax Court Litigation
• Tax Collections
• Tax Help

This article is for general informational purposes only and does not constitute legal advice. Reading this article does not create an attorney-client relationship with Kugelman Law. Results depend on specific facts. Past results do not guarantee future outcomes.