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What Is a Tax Audit? Triggers, Process, and How to Prepare
An IRS audit examines your tax return for accuracy. Here's what triggers audits, the different types, your rights, and how to handle one if it happens.
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An IRS audit examines your tax return for accuracy. Here's what triggers audits, the different types, your rights, and how to handle one if it happens.
This guide is designed for first-pass understanding. Start with core terms, then apply the framework in your own account workflow.
The word "audit" strikes fear into most taxpayers, but the reality is less dramatic than you think. Most audits are handled by mail, the overall audit rate is historically low, and being prepared makes the process manageable. That said, understanding what triggers an audit and how to respond is essential for every taxpayer.
A tax audit is an IRS examination of your tax return to verify that your reported income, deductions, and credits are accurate. It does not necessarily mean you did something wrong — returns can be selected randomly or flagged by computer matching. The overall audit rate is below 0.5% for most income levels, and the majority of audits are simple correspondence audits resolved by mail.
The IRS uses a combination of computer scoring (the Discriminant Information Function, or DIF score), information matching (comparing your return to 1099s and W-2s), and targeted campaigns to select returns for audit.
| Audit Type | How It Works | Frequency | Severity |
|---|---|---|---|
| Correspondence audit | IRS mails letter requesting documentation | Most common (~75% of audits) | Low — usually resolved by mail |
| Office audit | In-person at local IRS office | Less common | Moderate — focused on specific items |
| Field audit | IRS agent visits home or business | Rare — mostly business/high income | High — comprehensive examination |
The overall audit rate for individual returns has been below 0.5% in recent years. But the rate varies dramatically by income level:
Common triggers include: income discrepancies between your return and 1099s/W-2s, unusually large deductions relative to income, claiming the home office deduction, large charitable donations, reporting losses year after year, and random selection. The overall audit rate is about 0.4%, but higher-income returns are audited more frequently.
Correspondence audit (most common): the IRS mails you asking for documentation on specific items. Office audit: you visit a local IRS office with your records. Field audit (rarest): an agent visits your home or business. Most audits are correspondence audits that can be resolved by mailing supporting documents.
The IRS has 3 years to audit a return from the filing date, so keep records at least 3 years. If you underreported income by more than 25%, they have 6 years. For unfiled returns or fraud, there's no time limit. Keep records for 7 years to be safe, and keep investment cost basis records forever.
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The IRS has received substantial new funding to hire more agents and increase audits on high-income earners, large partnerships, and corporations. If your income is above $400,000, expect scrutiny to increase in coming years.
While some audits are random, certain patterns make your return more likely to be selected:
Don't panic. Here's how to handle an audit:
The IRS doesn't have unlimited time to audit you. The standard rules are:
| Situation | Time Limit |
|---|---|
| Standard audit window | 3 years from filing date (or due date, whichever is later) |
| Underreported income by 25%+ | 6 years |
| Fraud or failure to file | No limit |
This is why tax professionals recommend keeping records for at least seven years; it covers the six-year window plus a buffer. Keep investment cost basis records indefinitely.
An audit can end in three ways:
The Taxpayer Bill of Rights guarantees you several important protections during an audit:
Let's clear up some common misconceptions:
Three types of professionals can represent you before the IRS:
For a simple correspondence audit, you probably don't need professional help. For an office or field audit, the cost of representation typically pays for itself through better outcomes.
The best audit strategy is prevention through organized record-keeping throughout the year. Clarity automatically tracks and categorizes your income and expenses across all connected accounts, creating a clear paper trail that's invaluable if the IRS ever comes knocking. When every transaction is categorized and searchable, producing documentation for a specific deduction takes minutes rather than hours of digging through shoeboxes.
Report all income, even amounts without a 1099. Keep documentation for every deduction. Avoid round numbers; report actual amounts. And if something on your return seems aggressive, be prepared to defend it with documentation.
Review your most recent tax return with fresh eyes. Are your deductions proportionate to your income? Did you report all income from every 1099 and W-2? Could you substantiate every deduction with documentation if asked?
Set up a system to organize tax documents throughout the year rather than scrambling in April. Connect your accounts to Clarity to maintain a continuous, categorized record of your financial activity. If you ever receive an audit notice, you'll be able to pull up supporting documentation in minutes rather than digging through shoeboxes.
This article is for educational purposes and does not constitute tax advice. Consult a CPA or tax advisor for guidance specific to your situation.
Should you itemize or take the standard deduction? Compare 2024, 2025, and 2026 amounts, learn the SALT cap impact, and use our step-by-step process to.