IRS Audits: Odds, Triggers, and How to Respond (2025)

Audits are far rarer than people fear

The word “audit” causes outsized anxiety. In reality, the IRS audits well under 1% of individual returns in a typical year, and the large majority of those are simple correspondence letters, not in-person interrogations. The IRS — IRS Audits describes the process in plain terms.

The three kinds of audit

Most audits are correspondence audits handled entirely by mail, asking you to document one or two items. Less common are office audits at an IRS location and field audits at your home or business, which are reserved for more complex returns. Knowing which you face sets the right expectations.

What tends to draw attention

Common triggers include math errors, income that doesn't match the W-2s and 1099s the IRS already has, unusually large deductions relative to income, round-number estimates, claiming the home-office or vehicle deductions aggressively, and large charitable gifts without documentation. Most flags are automated comparisons, not personal suspicion.

How to respond the right way

If you receive a notice: read it carefully, note the deadline, and respond only to what is asked. Provide clear copies (never originals) of the specific records requested. Stay factual and unemotional. For anything beyond a simple letter, consider a CPA, enrolled agent, or tax attorney — and remember you have appeal rights if you disagree.

Stay audit-ready year-round

The best defense is boring recordkeeping: keep returns and supporting documents for at least three years (longer in some cases), log business mileage contemporaneously, and keep receipts for anything you deduct. If your return is accurate and documented, an audit is an inconvenience, not a catastrophe.