Surviving an IRS Audit
Audit triggers, types of audits, how to respond, and what documents to gather if you're selected.
TL;DR
- 01Expect most audits to arrive by mail, not in person.
- 02Watch for triggers like large charitable deductions and Schedule C losses.
- 03Let a CPA or attorney handle audit communications for you.
Tips
- 01Stick strictly to the documents the IRS requests, since volunteering unrelated information can open new lines of inquiry.
- 02File electronically to cut math and transcription errors, the most common triggers behind automated IRS notices.
- 03Respond to every audit notice before its deadline, since silence often leads to an automatic assessment of the proposed amount.
Warnings
- 01Unreported crypto transactions are easy for the IRS to spot, since exchanges already report your activity to the IRS on Form 1099.
- 02Phone calls or emails claiming to be the IRS about an audit are always a scam, since real notices arrive only by mail.
- 03Reconstructing a mileage log after the fact carries little weight with auditors, who trust contemporaneous records far more than memory.
Types of IRS Audits
Not all audits are equal in scope or severity. The IRS uses three primary audit formats, each with different implications.
| Audit Type | How It's Conducted | Scope | Frequency |
|---|---|---|---|
| Correspondence Audit | By mail only | Narrow — one or two issues | Most common (~75% of audits) |
| Office Audit | In-person at IRS office | Broader — several line items | Less common |
| Field Audit | IRS agent visits your home or business | Comprehensive | Rare; often for businesses |
| TCMP / Research Audit | Randomly selected; fully verified | Every line of the return | Very rare |
A correspondence audit is the least alarming — the IRS simply asks for documentation to support a specific item (e.g., charitable contribution receipts or proof of a business expense). Responding promptly and completely usually resolves these within a few months.
Common Audit Triggers
The IRS uses a Discriminant Information Function (DIF) scoring system to rank returns for audit potential. Returns with scores that deviate significantly from the statistical norm for that income level are more likely to be selected. Common triggers include:
- Large charitable deductions relative to income — particularly non-cash donations over $500 (requiring Form 8283).
- Schedule C losses — especially recurring losses that look like a hobby rather than a business, or unusually high expense ratios.
- Home office deduction — must be exclusively and regularly used for business; a room that doubles as a guest bedroom doesn't qualify.
- Income mismatches — if a 1099 or W-2 received by the IRS doesn't match what you reported on your return.
- High income — audit rates for returns with income above $1 million are meaningfully higher than average.
- Math errors or missing forms — these trigger automatic notices, not full audits.
Your Rights During an Audit
The IRS Taxpayer Bill of Rights guarantees specific protections throughout the audit process. Understanding these rights helps you respond appropriately without over-disclosing.
- Right to representation: You may have a CPA, enrolled agent, or attorney represent you. You are not required to speak directly with an IRS agent.
- Right to know why: The IRS must explain why it is auditing you and what documentation it needs.
- Right to appeal: If you disagree with the audit findings, you can appeal to the IRS Independent Office of Appeals — a separate, impartial body.
- Right to finality: The IRS generally cannot audit the same tax year twice after it has been closed.
- Right to privacy: The IRS can only request information relevant to the specific items under examination.
Responding to an Audit Notice
All IRS audit notices arrive by U.S. mail — the IRS does not initiate audits by phone, email, or social media. If you receive a phone call claiming to be the IRS, it is a scam.
Steps to take upon receiving a notice:
- Read it carefully and identify the exact tax year and items in question.
- Note the response deadline — typically 30 to 60 days. Missing it can result in automatic assessment of the amount the IRS proposes.
- Gather all supporting documents for the items questioned: bank statements, receipts, mileage logs, and third-party letters.
- Consider hiring a CPA or enrolled agent before responding, especially for office or field audits.
| IRS Notice | What It Means |
|---|---|
| CP2000 | Income mismatch — IRS proposes additional tax based on third-party data |
| Letter 2205 | Notification that your return was selected for examination |
| Letter 525 | Proposed changes after correspondence audit |
| Letter 531 | Notice of deficiency — you have 90 days to petition Tax Court |
How to Prepare and Prevent Future Audits
Good recordkeeping is the best audit defense. The IRS generally has 3 years to audit a return from the filing date, extended to 6 years if income was understated by 25% or more, and indefinitely if fraud is involved.
- Keep all tax-related documents for at least 7 years to be safe — W-2s, 1099s, receipts, mileage logs, and brokerage statements.
- For business use of vehicles, maintain a contemporaneous mileage log with date, destination, purpose, and miles — reconstructed logs are less credible.
- Ensure all income reported on 1099s, K-1s, and W-2s is fully accounted for on your return.
- For charitable contributions over $250, obtain a written acknowledgment from the organization.
FAQ
The IRS scores returns with a Discriminant Information Function (DIF) system that flags deviations from statistical norms for a given income level. Common triggers include large charitable deductions relative to income, recurring Schedule C losses, and income that doesn't match third-party 1099 or W-2 forms. Math errors usually trigger an automatic notice rather than a full audit.
The IRS generally has 3 years from the filing date to audit a return. That window extends to 6 years if you understated income by 25% or more, and there's no time limit at all if fraud is involved. Keeping records for at least 7 years covers you in nearly every case.
No. The Taxpayer Bill of Rights guarantees your right to representation, so a CPA, enrolled agent, or attorney can handle all communications on your behalf. You also have the right to know exactly why you're being audited and what documents the IRS needs.
A correspondence audit happens entirely by mail and targets one or two specific items, such as a charitable deduction or business expense; it accounts for roughly 75% of all audits. A field audit is far more comprehensive, with an IRS agent visiting your home or business, and is reserved mostly for businesses.