The IRS audit process starts with a letter in the mail identifying the tax year and the specific items under review, moves through either a mail exchange or an in-person meeting where you provide documentation for those items, and closes with one of three results: no change to your return, agreement with proposed adjustments, or a formal disagreement you can carry to the IRS Independent Office of Appeals and, if needed, the U.S. Tax Court. Being selected doesn’t mean the IRS suspects fraud. 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%.1Internal Revenue Service. IRS Data Book 2024 Knowing what each step requires, and where the decision points are, keeps the examination focused and gets you to a resolution faster.
How the IRS Contacts You
The IRS opens every examination with a letter sent through the U.S. Postal Service.2Internal Revenue Service. How to Know Its the IRS That letter identifies the tax year under review, the specific items being examined, the documents you need to provide, and the deadline to respond. First contact is always by mail. The IRS does not open 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 you get a suspicious call or letter, verify it through IRS.gov or by calling the number listed there rather than any number the suspicious contact gives you.2Internal Revenue Service. How to Know Its the IRS
After a revenue agent is assigned to an office or field examination, the agent may follow up by phone to schedule meetings. But that first contact always arrives by mail. If you’ve moved and haven’t updated your address with the IRS, you can miss the notice and the IRS will proceed without you.
The Three Types of Audits
The type of examination determines where the review takes place and how much of your return is at issue.
A correspondence audit is handled entirely by mail through an IRS service center. It focuses on one or two specific line items, such as a claimed education credit or a particular deduction. You send in copies of the requested documents, and the examiner reviews them without an in-person meeting.
An office audit requires you or your representative to attend a scheduled meeting at a local IRS office. A Tax Compliance Officer reviews multiple issues on the return, and the documentation is heavier than in a correspondence exam.
A field audit sends a Revenue Agent to 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.3Internal Revenue Service. Publication 556, Examination of Returns, Appeal Rights, and Claims for Refund
The format isn’t random. Simpler issues with a clear paper trail get routed to correspondence. Returns needing explanation and judgment go to office or field. If you receive a field audit notice for what looks like a single narrow issue, a representative can sometimes negotiate with the agent to tighten the scope or convert the examination to an office setting.
How Far Back the IRS Can Look
The IRS generally has three years from the date you filed your return to assess additional tax. That’s the standard statute of limitations and it covers most examinations.4Office of the Law Revision Counsel. 26 US Code 6501 – Limitations on Assessment and Collection Returns filed before the due date are treated as filed on the due date for purposes of starting the clock.
The window stretches to six years if you omitted more than 25% of your gross income.5Internal Revenue Service. Time IRS Can Assess Tax It stays open indefinitely for two situations: a return the IRS can prove was fraudulent with intent to evade tax, and a year for which you never filed at all.4Office of the Law Revision Counsel. 26 US Code 6501 – Limitations on Assessment and Collection
Preparing for the Audit
Read the examination letter carefully and gather exactly the documents it lists. Organize the 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.6Internal Revenue Service. About Form 2848, Power of Attorney and Declaration of Representative You can submit it online through your IRS account, by fax, or by mail.7Internal Revenue Service. Power of Attorney and Other Authorizations Once processed, the IRS routes communication to your representative, who can speak, negotiate, and sign documents on your behalf.
Provide only what’s asked. Volunteering extra records to show good faith often backfires. An examiner who sees unrelated documentation with something unusual in it has reason to widen the audit. Keep the documentation targeted and let your representative handle the substantive exchanges.
What Happens During the Examination
In a correspondence audit, the process is straightforward. You mail copies of your documentation, the examiner reviews them, and you receive a response either accepting your return as filed or proposing changes. Some resolve in a single exchange; others take 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 that each item on the return is supported by documentation and correctly applied under the tax code.
Examiners sometimes find inconsistencies or new issues while reviewing your records, and when that happens the scope can expand. This is where unrepresented taxpayers often lose ground, because a casual mention can open a new line of inquiry. A representative who has been through the process knows how to answer the examiner’s concerns without creating new ones.
If the examiner proposes adjustments that increase your tax, they must explain what’s changing and why, including the specific legal basis. That explanation gives you the information needed to agree, push back with more evidence, or identify the strongest arguments to raise later.
Your Rights in an Audit
Federal law provides several protections. The Taxpayer Bill of Rights guarantees professional and courteous treatment from IRS employees and the right to retain a representative of your choice.8Internal Revenue Service. Taxpayer Bill of Rights If you can’t afford representation, a Low Income Taxpayer Clinic may be able to 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. You must request it in writing at least 10 days before the interview.9Office of the Law Revision Counsel. 26 USC 7521 – Procedures Involving Taxpayer Interviews The IRS can also record interviews, but must give you 10 days’ notice, and you’re entitled to a copy.3Internal Revenue Service. Publication 556, Examination of Returns, Appeal Rights, and Claims for Refund
If you were audited for the same issue in a recent prior year and the IRS found no change, you may be able to invoke the repetitive audit policy. Contact the examiner or the number on your notice, provide a copy of your prior no-change letter, and the IRS will typically review the situation and 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 closes. Keep that letter. If the same issue comes up in a future year, it’s the evidence you’ll need for the repetitive audit policy.
Agreement
If the examiner proposes changes and you agree, you sign Form 870, a waiver of restrictions on assessment and collection.10Internal Revenue Service. Form 870 – Waiver of Restrictions on Assessment and Collection of Deficiency in Tax Signing consents to immediate assessment of the additional tax. As a practical matter, the IRS won’t issue a statutory notice of deficiency once you’ve signed, so you won’t have an opportunity to petition the Tax Court on those adjustments. Signing Form 870 closes the door on further dispute of the items covered. The IRS then bills you for the additional tax, interest, and any applicable penalties.
Disagreement and the 30-Day Letter
If you disagree, the examiner issues a report detailing the findings along with a 30-day letter. That letter gives you roughly 30 days to accept the changes or request a conference with the IRS Independent Office of Appeals.11Taxpayer Advocate Service. Examination Report Transmittal Audit Report Letter Giving Taxpayer 30 Days to Respond You can also try to resolve the dispute directly with the examiner’s supervisor before going to Appeals.
Appeals and Tax Court
The IRS Independent Office of Appeals exists to settle tax disputes without litigation. Appeals officers have authority examiners don’t: they can weigh the chances that the IRS would lose in court and settle based on that risk, something known as “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.3Internal Revenue Service. Publication 556, Examination of Returns, Appeal Rights, and Claims for Refund Larger cases require a formal protest detailing each adjustment you’re contesting, the facts supporting your position, and the legal authority you’re relying on.
Fast Track Settlement
If you’d prefer a faster route, 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 target is resolution within about 120 days. FTS is voluntary for both sides, and either 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.12Internal Revenue Service. LBI Appeals Fast Track Settlement Program FTS
The 90-Day Letter and Tax Court
If you don’t respond to the 30-day letter or can’t reach 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.13Office of the Law Revision Counsel. 26 USC 6213 – Restrictions Applicable to Deficiencies Petition to Tax Court 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). Miss the deadline and you forfeit 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.3Internal Revenue Service. Publication 556, Examination of Returns, Appeal Rights, and Claims for Refund Small case decisions are final and cannot be appealed by either side. If you miss the 90-day window, you can still pay the assessed tax and then 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 on the Bill
Audit adjustments don’t just raise the tax you owe. They trigger interest and potentially penalties that can add substantially to the total.
Interest
Interest on an underpayment runs from the original due date of the return, not from the date the audit concludes.14Office of the Law Revision Counsel. 26 USC 6601 – Interest on Underpayment Nonpayment or Extensions of Time for Payment of Tax 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%.15Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026 Interest cannot be waived or abated regardless of circumstances.
Accuracy-Related Penalty
The most common audit penalty is the accuracy-related penalty under 26 USC ยง6662, which adds 20% to the portion of the underpayment caused by negligence, disregard of rules, or a substantial understatement of income tax.16Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy Related Penalty on Underpayments 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.17Office of the Law Revision Counsel. 26 USC 6663 – Imposition of Fraud Penalty The burden of proof is on the IRS to show fraud, but 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 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.18Internal Revenue Service. Penalty Relief for Reasonable Cause Factors that generally don’t qualify include lack of knowledge of the tax law, simple mistakes, and lack of funds. 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 produces a balance you can’t pay in full, several arrangements are available.
A short-term payment plan lets you pay in full within 180 days with no setup fee. Interest keeps accruing until the balance is paid.
A streamlined installment agreement covers individual balances of $50,000 or less, including penalties and interest, and lets you pay monthly 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.19Internal Revenue Service. Payment Plans Installment Agreements
A non-streamlined installment agreement handles individual balances above $50,000 and up to $250,000. The IRS requires detailed financial information at this level, and a federal tax lien is likely.
Interest and the failure-to-pay penalty keep accruing on any unpaid balance during an installment agreement, so paying down the balance faster saves real money.
If you genuinely believe the audit result 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. 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.20Internal Revenue Service. Form 656-L Offer in Compromise Doubt as to Liability 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 originally.21Internal Revenue Service. Examination Audit Reconsideration Process
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 came from a closing agreement, an accepted offer in compromise, or a final court decision.
The route is particularly useful if you received a default assessment because you never responded to the original examination notice. It gives you a second chance to present your case, though you’ll still owe interest on any amount that remains due.