IRS Audit Red Flags: What Triggers an Audit and How to Protect Yourself

The IRS audits less than 1% of individual returns — but certain patterns dramatically increase your odds. Here's what triggers audits and how to protect yourself.

The IRS uses statistical models to compare your deductions to others in your income range. Deductions that are significantly higher than average for your income level raise flags. This doesn't mean you shouldn't claim legitimate deductions — just make sure you can document them.

Very few people use a vehicle exclusively for business. Claiming 100% business use without a mileage log is a red flag. Keep detailed records.

Claiming a business loss year after year signals to the IRS that your "business" might be a hobby. The IRS has a "hobby loss" rule: if your business doesn't show a profit in at least 3 of 5 years, it may be reclassified as a hobby — and hobby losses aren't deductible.

The IRS receives copies of all 1099s and W-2s issued to you. If income reported on those forms doesn't match your return, you'll get a notice automatically.

Expenses reported in round numbers ($5,000, $10,000) look estimated rather than documented. Real expenses have specific amounts.

The home office deduction is legitimate — but it's also commonly abused. Make sure your workspace truly meets the "regular and exclusive use" test.

Restaurants, salons, and other cash-heavy businesses are scrutinized more closely because cash income is easier to underreport.

• Keep receipts and documentation for every deduction
• Maintain a mileage log if you deduct vehicle expenses
• Reconcile your books monthly
• Report all income — including cash and 1099 income
• Work with a qualified tax preparer who knows the rules

Don't panic. Most audits are correspondence audits — the IRS sends a letter asking for documentation of a specific item. Respond promptly with organized records. If you've kept good books and documentation, an audit is manageable.

The best audit protection is clean, accurate bookkeeping and a tax return prepared by a qualified professional.

• 10 Tax Deductions Every Small Business Owner Should Know
• The Home Office Deduction: How to Claim It Correctly
• Why Tax Planning Should Happen Year-Round
• 7 Bookkeeping Mistakes Small Business Owners Make
• Our Tax Preparation Services
• Our Bookkeeping Services
• Contact Us

Clean books and accurate tax returns are your best audit protection. The Gap ProAdvisors handles bookkeeping and tax preparation for small businesses nationwide. Contact us.