IRS Audit Red Flags: What Actually Draws Scrutiny

Overall audit rates are low, but they are not random. Certain positions and patterns reliably raise the odds of IRS scrutiny. Knowing them helps you prepare returns that are both correct and defensible.

Common triggers

• Large deductions relative to income — outsized charitable, business, or casualty deductions compared to peers.
• Schedule C losses, especially recurring losses that look like a hobby, and 100% business use of a vehicle.
• Cash-intensive businesses and unusually low reported income for the industry.
• Round numbers and estimates that suggest records were not kept.
• Unreported income — mismatches with W-2s, 1099s, and K-1s the IRS already has.
• Refundable credits such as the EITC, which carry preparer due-diligence requirements.
• Foreign accounts and digital assets — the return questions are there for a reason.

The best defense

Documentation. Contemporaneous logs, receipts, mileage records, and charitable acknowledgments turn a stressful audit into a paperwork exercise. Report all income that appears on information returns, use reasonable and supportable numbers, and disclose where the rules call for it.

For preparers

Meet your due-diligence obligations, keep your workpapers, and counsel clients that aggressive positions without substantiation are the ones that unravel. A well-documented return is the cheapest audit insurance there is.