IRS Audit Red Flags Every Owner Should Understand

Deductions out of proportion to income

The scoring system compares your deductions to peers at similar income in similar industries. Legitimate outliers exist, a launch year, a build-out, a bad year, but outliers without documentation are indefensible. Take every deduction you're entitled to; keep every record that proves it.

The perennial categories

Vehicle use claimed at 100% business, meals and travel without logs, and home office claims without a genuinely exclusive space draw disproportionate attention because they are disproportionately abused. Contemporaneous records, mileage logs, receipts annotated with business purpose, turn these from vulnerabilities into non-events.

Cash-intensive operations

Restaurants, salons, retail, and trades face structural skepticism because cash income is easy to underreport. Lifestyle-versus-reported-income analysis is a standard examination technique. Rigorous daily recording is both the compliance answer and, notably, the valuation answer, unreported cash suppresses what your business is worth on exit.

Recurring losses

Multiple consecutive loss years trigger hobby-loss scrutiny, which examines whether you operate with genuine profit motive: business plans, separate accounts, professional records, adaptation over time. The documentation of intent matters as much as the numbers.

Payroll and contractor classification

Worker misclassification, treating employees as contractors, is a persistent enforcement priority with back-tax and penalty exposure. The tests concern control and independence, not what the contract page says.