What Happens During an IRS Audit? Step-by-Step Guide

Introduction

Few things cause more anxiety than receiving an IRS audit notice in the mail. Your mind races with questions: What did I do wrong? Will I owe thousands more? Could I go to jail? Take a deep breath — understanding exactly what happens during an IRS audit can transform a terrifying experience into a manageable process.

The truth is, most IRS audits are far less dramatic than television and movies would have you believe. Many are handled entirely through the mail, never requiring a face-to-face meeting. And the vast majority of audited taxpayers don’t face criminal charges — audits are civil matters focused on verifying the accuracy of your tax return.

In this complete guide, we’ll walk you through every stage of the IRS audit process from start to finish. You’ll learn about the three types of audits, what triggers them, what the IRS is looking for, what documents you should bring or send, how long the process takes, and what your rights are at every step. Whether you’ve already received an audit notice or you want to be prepared just in case, this guide will arm you with the knowledge you need.

For information on what makes the IRS select certain returns, see our guide on IRS audit red flags. And if you want actionable strategies for getting through an audit successfully, check out our 10 expert tips for surviving an IRS audit.

The 3 Types of IRS Audits

Not all audits are created equal. The IRS conducts three types of examinations, each with a different scope, process, and level of intensity.

1. Correspondence Audit (Mail Audit)

What it is: The simplest and most common type of audit, conducted entirely through the mail. The IRS sends you a letter requesting documentation for specific items on your return.

What to expect: – A letter (usually Notice CP2000, CP2501, or a 566 letter) identifying the specific items being questioned – A request for supporting documents (receipts, statements, etc.) – A deadline to respond (usually 30 days) – No in-person meeting required

Common items reviewed: – Charitable contribution documentation – Itemized deduction verification – Income discrepancies (1099 matching) – Education credits – Filing status and dependency claims

Percentage of all audits: Approximately 75-80% of all IRS audits are correspondence audits.

2. Office Audit

What it is: A more in-depth examination conducted at an IRS office. You’ll be asked to visit your local IRS office and meet with a tax compliance officer (TCO) who will review specific items on your return.

What to expect: – An appointment letter (Letter 3572) specifying the date, time, and items under review – A meeting at an IRS office lasting 2-4 hours on average – The IRS agent will ask questions and review your documents – You can bring a representative (CPA, EA, or attorney) — and you should

Common items reviewed: – Schedule C business income and expenses – Rental income and expenses – Complex itemized deductions – Employee business expenses – Multiple tax issues on a single return

3. Field Audit

What it is: The most comprehensive and intensive type of audit, conducted by a Revenue Agent at your home, business, or accountant’s office. Field audits typically involve larger, more complex returns or significant suspected discrepancies.

What to expect: – A notification letter followed by a phone call from the Revenue Agent – The agent will want to visit your business or residence (you can request your accountant’s office instead) – Multiple meetings over days, weeks, or even months – In-depth review of records, books, bank statements, and financial documents – The agent may interview you, employees, or business associates

Who gets field audits: – High-income taxpayers ($1M+) – Business owners with complex operations – Taxpayers suspected of significant non-compliance – Returns with potential fraud indicators

Audit Type	Location	Duration	Complexity	% of All Audits
Correspondence	Your mailbox	1-6 months	Low	~75-80%
Office	IRS office	2-6 months	Medium	~15-20%
Field	Your home/office	3-12+ months	High	~5-10%

The IRS Audit Process: Step by Step

Step 1: You Receive the Audit Notice

The IRS always initiates contact by mail — never by phone, email, or text. Your audit notice will contain:

• The type of examination (correspondence, office, or field)
• The tax year(s) being examined
• The specific items or issues under review
• Deadlines for responding or appearing
• Your rights as a taxpayer (IRS Publication 1)
• Contact information for the assigned examiner

Important: If you receive a phone call from someone claiming to be the IRS demanding immediate payment, it’s a scam. The IRS always sends written notice first.

Step 2: Review and Prepare

Once you receive the notice, take these immediate steps:

• 1. Read the entire notice carefully— Understand exactly what’s being questioned
• 2. Note all deadlines— Missing a deadline can result in automatic, unfavorable adjustments
• 3. Gather relevant documents— Pull together everything related to the items under review
• 4. Contact a tax professional— Even for correspondence audits, professional guidance can prevent mistakes. Reach out to Global Gate Tax Relief for a free consultation.
• 5. Don’t panic, and don’t call the IRS immediately— Take time to prepare your response rather than reacting emotionally

Step 3: Organize Your Documentation

The foundation of a successful audit is documentation. For each item under review, gather:

Income verification: – W-2s, 1099s, K-1s – Bank statements showing deposits – Business records, invoices, and receipts – Brokerage statements

Deduction/credit support: – Receipts and invoices – Canceled checks or bank/credit card statements – Mileage logs – Home office measurements and photos – Charitable donation acknowledgment letters – Medical bills and insurance EOBs – Mortgage interest statements (Form 1098) – Education expense records (Form 1098-T)

General records: – Prior year tax returns – Amended returns filed – Correspondence with the IRS – Professional tax advice received

Step 4: Respond to the IRS

For correspondence audits: – Mail your response with copies (never originals) of supporting documents – Send via certified mail with return receipt – Keep a complete copy of everything you send – Respond within the deadline — request an extension if needed

For office audits: – Attend the appointment at the scheduled time (or have your representative attend on your behalf using Form 2848 Power of Attorney) – Bring organized documentation — use folders or binders with tabs – Only bring documents that are requested — don’t volunteer additional information

For field audits: – Your representative should handle most interactions – Request that the audit take place at your representative’s office (not your home or business) – Provide only what is requested — nothing more

Step 5: The Examination

During the actual examination:

The auditor will: – Review your documents for each item in question – Ask clarifying questions – Request additional documentation if needed – Take notes and make copies of relevant records – Compare your records to your tax return

You should: – Answer questions truthfully but concisely — don’t volunteer extra information – Say “I’ll need to look into that” rather than guessing or speculating – Take notes on what the auditor asks for and says – Remain calm, polite, and professional – Let your representative do the talking when possible

Step 6: Receive the Audit Results

After the examination, the IRS will issue one of three outcomes:

• 1. No Change— The audit found that your return was accurate. Congratulations — you’ll receive a letter confirming no adjustments. This is more common than most people think.
• 2. Agreed— The IRS proposes changes, and you agree with them. You’ll sign an agreement form and either pay the additional tax (plus interest and any penalties) or receive a refund if the audit worked in your favor.
• 3. Disagreed— The IRS proposes changes, but you disagree with some or all of them. This triggers the appeals process (see Step 7).

Step 7: Appeal (If You Disagree)

If you disagree with the audit results, you have robust appeal rights:

• 1. Request a meeting with the auditor’s supervisor— Sometimes issues can be resolved informally
• 2. File a protest with IRS Appeals— The Independent Office of Appeals provides a fresh, independent review of your case. Appeals officers have broad authority to settle cases.
• 3. Petition the U.S. Tax Court— If you receive a Notice of Deficiency (90-day letter), you can petition the Tax Court without paying the proposed tax first
• 4. Pay and sue for refund— Alternatively, pay the assessed amount and file a refund claim, then sue in U.S. District Court or the Court of Federal Claims

Deadline alert: You have 30 days to file a protest after receiving the examination report, and 90 days to petition Tax Court after receiving a Notice of Deficiency. Missing these deadlines can permanently waive your appeal rights.

IRS Audit Timeline: How Long Does It Take?

Audit Phase	Typical Duration
IRS notice to first response	30 days
Correspondence audit (total)	3-6 months
Office audit (total)	3-9 months
Field audit (total)	6-18 months
IRS Appeals process	6-12 months
Tax Court petition to resolution	12-24+ months

The IRS generally has 3 years from the date you filed (or the due date, whichever is later) to audit your return under the standard statute of limitations. This means most audits begin within 1-2 years of filing.

Important: If you’re running close to the 3-year statute of limitations, the IRS may ask you to sign Form 872 (Consent to Extend Time). You have the right to refuse, but refusing may cause the IRS to quickly issue a deficiency notice based on incomplete information — often resulting in a worse outcome.

Your Rights During an IRS Audit

The Taxpayer Bill of Rights (IRC § 7803(a)(3)) guarantees you fundamental protections:

• 1. The right to be informed— You must be told what the IRS needs and how the process works
• 2. The right to quality service— You can expect professional, courteous treatment
• 3. The right to pay no more than the correct amount of tax
• 4. The right to challenge the IRS’s position and be heard
• 5. The right to appeal— In an independent forum
• 6. The right to finality— To know the maximum time for audits and collections
• 7. The right to privacy— IRS actions must be no more intrusive than necessary
• 8. The right to confidentiality— Your tax information is protected
• 9. The right to retain representation— You can hire a CPA, EA, or attorney to represent you
• 10. The right to a fair and just tax system— Including consideration of hardship

If you believe the IRS has violated your rights, you can contact the Taxpayer Advocate Service (TAS) at 1-877-777-4778.

What Triggers an Audit to Expand?

Sometimes an audit that starts with one issue can expand to cover additional items or years. This happens when:

• The auditor discovers unreported incomeduring the examination
• Your records reveal inconsistencieswith other tax years
• The auditor identifies potential fraud indicators
• Information from your audit leads to questions about related taxpayers(business partners, employers)

This is one reason why it’s critical to only provide documentation that’s specifically requested and to have professional representation that can manage the scope of the examination. A skilled tax professional knows how to keep audits focused and prevent unnecessary expansion.

Common Audit Outcomes and Adjustments

The most frequent audit adjustments include:

• Disallowed deductionsdue to lack of documentation
• Unreported incomeidentified through 1099 matching
• Changed filing status(e.g., Head of Household to Single)
• Disallowed credits(EITC, education credits, child tax credit)
• Reclassified expenses(personal expenses claimed as business)
• Recalculated depreciationon business or rental property

If the audit results in additional tax owed, you’ll also owe interest (from the original due date) and potentially accuracy-related penalties under IRC § 6662. If you can’t pay the full amount, you may qualify for an installment agreement or Offer in Compromise.

Frequently Asked Questions

Can I represent myself during an IRS audit?

Yes, you have the right to represent yourself in any IRS audit. For simple correspondence audits involving straightforward documentation (like verifying a charitable donation receipt), self-representation is often fine. However, for office and field audits, professional representation is strongly recommended. Taxpayers who represent themselves often inadvertently provide too much information, make damaging admissions, or agree to unfavorable adjustments. An Enrolled Agent or Tax Resolution Specialist can attend the audit on your behalf using Form 2848 (Power of Attorney), meaning you don’t even have to be present.

Will I owe penalties after an audit?

Not necessarily. If the audit results in no change or a small adjustment, penalties may not apply. However, if the IRS finds a substantial understatement of income (exceeding the greater of 10% of the correct tax or $5,000), you may face the 20% accuracy-related penalty under IRC § 6662. If the IRS determines fraud, the penalty jumps to 75%. You can defend against these penalties by showing reasonable cause and good faith — another reason professional representation is valuable. All penalties from an audit are eligible for challenge through the appeals process.

Can the IRS audit me for multiple years at once?

Yes. While most audits focus on a single tax year, the IRS can expand the examination to additional years if it finds issues that suggest a pattern. For example, if an audit of your 2023 return reveals unreported income, the IRS may open examinations for 2022 and 2024 as well. Typically, the IRS examines up to 3 years at a time, though more years can be added in cases of substantial omissions or fraud. Your representative can negotiate the scope of the examination and push back against unnecessary expansion.

What if I don’t have the documents the IRS is asking for?

If you’ve lost records, there are several ways to reconstruct documentation. Request copies of financial records from your bank, brokerage, or credit card company. Obtain duplicate receipts from vendors. Request your IRS account transcript (Form 4506-T) to see what information returns the IRS has on file. For charitable donations, contact the organizations for duplicate acknowledgment letters. For expenses like mileage, you may be able to use secondary evidence like calendar entries, appointment books, or phone GPS data. While reconstructed records aren’t as strong as contemporaneous records, they’re far better than no documentation at all.

Can an IRS audit result in a refund?

Yes — it happens more often than you’d think. If the auditor discovers that you overpaid your taxes, underreported your deductions, or didn’t claim credits you were entitled to, the audit can result in a refund. However, the auditor’s job is to verify what’s on your return, not to prepare your return for you. A tax professional representing you in the audit is more likely to identify refund opportunities and advocate for favorable positions. About 10-15% of audits result in a refund or no change to the return.

How will I know when the audit is over?

The IRS will send you a formal closing letter. For no change audits, you’ll receive Letter 3401-C confirming no adjustments. For agreed audits, you’ll sign Form 870 (Waiver of Restrictions on Assessment), and the IRS will issue an adjustment notice. For unagreed audits, you’ll receive a 30-day letter proposing the changes and explaining your appeal rights, followed by a 90-day letter (Notice of Deficiency) if you don’t respond or reach an agreement. Keep all closing letters for your records — they’re important documentation if the IRS ever attempts to reopen the same tax year.

Facing an IRS Audit? Get Expert Representation

An IRS audit doesn’t have to be a nightmare. With proper preparation, professional representation, and a clear understanding of the process, most audits end with manageable results. Our team has successfully represented thousands of taxpayers through IRS examinations of all types.

Need help? Call Global Gate Tax Relief at 1-877-800-8180 for a free consultation. Our team of tax professionals has helped thousands of Americans resolve their IRS problems.