IRS Exam Process: Types, Timeline, and Appeals

If the IRS has selected your return for examination, the process will begin with a letter in the mail, run through one of three formats depending on the complexity of the issues, and end in one of three outcomes: no change, an agreement to proposed adjustments, or a dispute you can push into IRS Appeals and, if necessary, the U.S. Tax Court. The IRS audit process is narrower and more procedural than most people expect, and knowing the sequence and your decision points at each stage is the real advantage. The overall audit rate for individual returns has hovered around 0.44% in recent years, though taxpayers reporting more than $10 million in income face examination rates above 8%.¹ Selection does not mean the IRS suspects fraud or even an error.

How the IRS Will Contact You

The IRS initiates an examination by letter sent through the U.S. Postal Service.² That letter identifies the tax year under review, the specific items the IRS wants to examine, the documents you need to provide, and a deadline to respond. This is always the first step. The IRS does not initiate audits by phone, email, or text.

Scam calls impersonating the IRS are common. The real IRS will not demand immediate payment over the phone, threaten arrest, or ask for payment by gift card or cryptocurrency. If a call or letter looks suspicious, verify it through IRS.gov or by calling the number listed there, not any number provided in the questionable contact.²

After a revenue agent is assigned to an office or field audit, the agent may follow up by phone to schedule meetings. But the first contact always comes by mail. If you’ve moved and haven’t updated your address with the IRS, you can miss the notice entirely and the IRS will proceed without you.

The Three Types of Audits

The format the IRS assigns tells you a lot about how much of your return is actually at issue.

Correspondence audit. Handled entirely by mail through an IRS service center. These focus on one or two line items, such as a claimed education credit or a particular deduction. You mail copies of the requested documents and an examiner reviews them without any in-person meeting.
Office audit. You or your representative attend a scheduled meeting at a local IRS office. A Tax Compliance Officer reviews multiple issues and typically wants more documentation than a correspondence audit requires.
Field audit. A Revenue Agent visits your home, business, or your representative’s office. Field audits are the most comprehensive and are usually reserved for complex returns, business owners, high-net-worth individuals, and situations involving multiple entities or tax years.³

If you receive a field audit notice for what seems like a single straightforward issue, a representative can sometimes negotiate with the agent to narrow the scope or convert the examination to an office setting.

How Far Back the IRS Can Reach

The IRS generally has three years from the date you filed your return to assess additional tax. This is the standard statute of limitations and covers most examinations.⁴ Returns filed before the due date are treated as filed on the due date for purposes of starting the clock.

That window extends to six years if you omitted more than 25% of your gross income from the return.⁵ If you filed a fraudulent return with intent to evade tax, there is no time limit. And if you never filed a return for a particular year, the clock never starts.⁴

Hold supporting documents at least three years after filing, six years if there’s any chance of an income omission issue, and seven years if you claimed a loss from worthless securities or bad debts. Keep records indefinitely for any year you didn’t file.⁶

Getting Ready to Respond

Read the examination letter carefully and gather exactly the documents it lists. Organize records by category with a clear index showing what was requested and what you’re providing. The goal is to make the examiner’s job easy on the specific issues under review and nothing else.

If you want a tax professional to handle the examination for you, authorize them by filing Form 2848, Power of Attorney and Declaration of Representative.⁷ You can submit it online through your IRS account, by fax, or by mail.⁸ Once processed, the IRS routes communication to your representative, who can speak, negotiate, and sign documents on your behalf.

Provide only what’s requested. Volunteering extra records to show good faith often backfires. An examiner who sees unrelated documentation with something unusual in it has reason to expand the scope. Keep the conversation narrow and the documentation targeted.

What Happens Once the Review Begins

In a correspondence audit, you mail in copies of your documentation, the examiner reviews them, and you get a response either accepting the return as filed or proposing changes. Some resolve in a single exchange; others require additional rounds.

Office and field audits involve face-to-face interaction. Your representative presents the records and explains the tax treatment of the transactions under review. If you attend personally, answer questions directly and honestly, but only after conferring with your representative. The examiner’s job is to verify whether each item on the return is supported by documentation and correctly applied under the tax code.

Examiners sometimes discover inconsistencies or new issues while reviewing records, and when that happens the scope can expand. An unrepresented taxpayer may casually mention something that opens an entirely new line of inquiry. If the examiner proposes adjustments, they must explain what’s changing and why, including the specific legal basis for the adjustment.

Your Rights During the Audit

The Taxpayer Bill of Rights guarantees professional and courteous treatment from IRS employees and the right to retain a representative of your choice.⁹ If you can’t afford representation, a Low Income Taxpayer Clinic can help.

You have the right to make an audio recording of any in-person examination interview, at your own expense and with your own equipment, by requesting it in writing at least 10 days before the interview.¹⁰ The IRS can also record interviews with 10 days’ notice, and you’re entitled to a copy.³

If you’ve been audited for the same issue in a recent prior year and the IRS found no change, you may be able to invoke the IRS’s repetitive audit policy. Contact the examiner or the number on your notice and provide a copy of your prior no-change letter. The IRS may discontinue the new examination if the facts are substantially the same.

How the Audit Ends

Every examination reaches one of three outcomes.

No Change

If the examiner finds everything on your return is correct, you receive a no-change letter and the case is closed. Keep that letter. It becomes valuable evidence under the repetitive audit policy if the same issue comes up in a future year.

Agreement

If the examiner proposes changes and you agree, you sign Form 870, a waiver of restrictions on assessment and collection.¹¹ Signing consents to immediate assessment. As a practical matter, the IRS won’t issue a statutory notice of deficiency after you sign, so you won’t have an opportunity to petition the Tax Court. The IRS then bills you for the additional tax, plus interest and any applicable penalties.

Disagreement and the 30-Day Letter

If you disagree, the examiner issues a report with the findings and a 30-day letter. This gives you roughly 30 days to accept the changes or request a conference with the IRS Independent Office of Appeals.¹² You can also try to resolve the dispute directly with the examiner’s supervisor before going to Appeals.

Appeals, Fast Track, and Tax Court

The IRS Independent Office of Appeals exists specifically to settle tax disputes without litigation. Appeals officers have authority examiners don’t: they can weigh the chances the IRS would lose in court and settle cases based on that risk, something called “hazards of litigation.” Appeals can split the difference on genuinely uncertain issues in ways the examination division cannot.

For disputes where the total amount at issue for any tax period is $25,000 or less, you can make a small case request instead of preparing a formal written protest.³ Larger cases require a formal protest detailing each adjustment you’re contesting, the supporting facts, and the legal authority you’re relying on.

Fast Track Settlement

The Fast Track Settlement program brings an Appeals officer into the process while the case is still with the examination division, rather than after it closes. The goal is resolution within about 120 days. FTS is voluntary for both the taxpayer and the IRS, and either side can withdraw at any time. Cases involving issues designated for litigation, challenges to the constitutionality of tax law, or situations where the taxpayer is unwilling to explore compromise are excluded.¹³

The 90-Day Letter and Tax Court

If you don’t respond to the 30-day letter or can’t reach an agreement through Appeals, the IRS issues a Statutory Notice of Deficiency, commonly called the 90-day letter. This is a formal legal document sent by certified or registered mail establishing what the IRS believes you owe.¹⁴ From the mailing date, you have exactly 90 days to file a petition with the U.S. Tax Court (150 days if the notice is addressed to you outside the United States). Missing this deadline forfeits your right to challenge the tax in Tax Court before paying it.

The Tax Court is the only court where you can dispute a tax deficiency without paying it first. For cases involving $50,000 or less per tax year, the Tax Court offers a simplified small case procedure with less formal rules of evidence.³ Small case decisions are final and cannot be appealed by either side. If you miss the 90-day window entirely, you can still pay the assessed tax and sue for a refund in U.S. District Court or the U.S. Court of Federal Claims, but you’ll be out of pocket while the case is pending.

Penalties and Interest

Audit adjustments don’t just raise the tax you owe. They also trigger interest and potentially penalties that can add substantially to the bill.

Interest

Interest on an underpayment runs from the original due date of the return, not from the date the audit concludes.¹⁵ If the IRS audits your 2022 return in 2026 and finds an additional $10,000 owed, interest has been accumulating since April 2023. The rate is the federal short-term rate plus three percentage points, compounded daily, and it adjusts quarterly. For the first quarter of 2026, the underpayment rate for individuals is 7%.¹⁶ Interest cannot be waived.

Accuracy-Related Penalty

The most common audit penalty is the accuracy-related penalty under 26 USC §6662, which adds 20% to the portion of the underpayment caused by negligence, disregard of rules, or a substantial understatement of income tax.¹⁷ A “substantial understatement” for individuals means the understatement exceeds the greater of 10% of the correct tax or $5,000. For taxpayers claiming the qualified business income deduction, that 10% threshold drops to 5%.

Civil Fraud Penalty

Where the IRS establishes that any part of an underpayment is due to fraud, a 75% penalty applies to the fraudulent portion.¹⁸ The burden of proof falls on the IRS. Once any portion is established as fraudulent, the entire underpayment is treated as fraud unless you can prove otherwise. The civil fraud penalty and the accuracy-related penalty cannot both apply to the same dollars.

Penalty Relief

Penalties, though not interest, can be reduced or eliminated if you can show reasonable cause. The IRS evaluates this case-by-case, looking at whether you exercised ordinary care and prudence. Factors that support relief include fires or natural disasters that destroyed records, serious illness, and reliance on a competent tax advisor to whom you provided complete information.¹⁹ Lack of knowledge of the tax law, simple mistakes, and lack of funds generally don’t qualify. For accuracy-related penalties, the IRS also considers the complexity of the issue, your education and experience, and the steps you took to determine the correct tax treatment.

Paying What You Owe

If an examination results in additional tax you can’t pay in full immediately, the IRS offers several arrangements.

Short-term payment plan. If you can pay in full within 180 days, you can set up a short-term plan with no setup fee. Interest continues to accrue until the balance is paid.
Streamlined installment agreement. For individual balances of $50,000 or less (including penalties and interest), you can set up monthly payments over up to 72 months without submitting detailed financial statements. Setup fees range from $22 (online, direct debit) to $178 (phone or mail, standard payment), with reduced fees or full waivers for low-income taxpayers.²⁰
Non-streamlined installment agreement. For individual balances above $50,000 and up to $250,000, the IRS requires detailed financial information. A federal tax lien is likely at this level.

Interest and the failure-to-pay penalty continue to accrue on any unpaid balance during an installment agreement, so paying down faster saves real money.

If you believe the audit result itself is wrong and the assessed tax doesn’t reflect what you actually owe, an Offer in Compromise based on doubt as to liability may be an option. You submit Form 656-L with a written explanation of why the tax is incorrect and any supporting evidence. No application fee or deposit is required for this type of offer.²¹ The IRS won’t consider it if the debt has been established by a final court decision, if you’re in open bankruptcy, or if the same matter is in litigation.

Reopening a Closed Audit

If an examination closed with changes you didn’t agree to, perhaps because you missed the deadline to respond or didn’t have the right records at the time, you may be able to request audit reconsideration. This is not an appeal; it’s a request for the IRS to reopen a closed case and look at new information you weren’t able to provide the first time.²²

To qualify, the assessment must still be unpaid in whole or part, you must identify which specific adjustments you’re disputing, and you must provide new documentation that wasn’t available during the original examination. You can submit your request in writing with supporting documents, or use Form 12661. Reconsideration is not available if the assessment resulted from a closing agreement, an accepted offer in compromise, or a final court decision.

This process is particularly useful if you received a default assessment because you never responded to the original examination notice. You’ll still owe interest on any amount that remains due after reconsideration.

1
Internal Revenue Service. IRS Data Book 2024
2
Internal Revenue Service. How to Know Its the IRS
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Internal Revenue Service. Publication 556, Examination of Returns, Appeal Rights, and Claims for Refund
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Office of the Law Revision Counsel. 26 US Code 6501 – Limitations on Assessment and Collection
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Internal Revenue Service. Time IRS Can Assess Tax
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Internal Revenue Service. How Long Should I Keep Records
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Internal Revenue Service. About Form 2848, Power of Attorney and Declaration of Representative
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Internal Revenue Service. Power of Attorney and Other Authorizations
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Internal Revenue Service. Taxpayer Bill of Rights
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Office of the Law Revision Counsel. 26 USC 7521 – Procedures Involving Taxpayer Interviews
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Internal Revenue Service. Form 870 – Waiver of Restrictions on Assessment and Collection of Deficiency in Tax
12
Taxpayer Advocate Service. Examination Report Transmittal Audit Report Letter Giving Taxpayer 30 Days to Respond
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Internal Revenue Service. LBI Appeals Fast Track Settlement Program FTS
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Office of the Law Revision Counsel. 26 USC 6213 – Restrictions Applicable to Deficiencies Petition to Tax Court
15
Office of the Law Revision Counsel. 26 USC 6601 – Interest on Underpayment Nonpayment or Extensions of Time for Payment of Tax
16
Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026
17
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy Related Penalty on Underpayments
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Office of the Law Revision Counsel. 26 USC 6663 – Imposition of Fraud Penalty
19
Internal Revenue Service. Penalty Relief for Reasonable Cause
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Internal Revenue Service. Payment Plans Installment Agreements
21
Internal Revenue Service. Form 656-L Offer in Compromise Doubt as to Liability
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Internal Revenue Service. Examination Audit Reconsideration Process