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5 IRS Audit TriggersIRS audit algorithms got smarter in 2026. The agency uses AI and the Discriminant Function System (DIF) to score every return against statistical norms. Here are the five behaviors most likely to land you in an audit - and how to avoid them. 1. High Income (Over $400K) Why it triggers: Higher audit rates kick in at $400K+ annually, especially if your income includes self-employment, capital gains, or cryptocurrency. How to avoid it: Document everything. Keep detailed records of all income sources, track large gains with related expenses and transaction histories, and for crypto, track every single trade. IRS matching programs compare what you report with what employers and brokerages report. Discrepancies = audit. 2. Excessive or Unusual Deductions Why it triggers: When deductions are disproportionately large compared to your income bracket, red flags go up. Large charitable donations, medical expenses, and business write-offs get scrutinized. Claiming 100% business use of a vehicle or home office without proper documentation is audit bait. How to avoid it: Benchmark your deductions against IRS averages for your income level. For charitable gifts over $500 (non-cash), include Form 8283. Keep logs for mileage, travel, and business use of home or car. If claiming a home office, document square footage, exclusive use, and related expenses. A taxpayer earning $75K claiming $30K in charitable donations is more likely to be flagged than someone earning $300K making the same donation. 3. Unreported Income (Including Side Hustles) Why it triggers: Many taxpayers forget income from side hustles or digital platforms like Etsy, Airbnb, or freelance work. Reporting rules changed significantly in 2025 and 2026. How to avoid it: The One Big Beautiful Bill Act (OBBBA) reversed the planned $600 threshold for third-party settlement organizations (Venmo, PayPal, Etsy). The threshold is back to $20,000 and 200 transactions for 2026. The 1099-NEC and 1099-MISC thres

5 IRS Audit TriggersIRS audit algorithms got smarter in 2026. The agency uses AI and the Discriminant Function System (DIF) to score every return against statistical norms. Here are the five behaviors most likely to land you in an audit - and how to avoid them. 1. High Income (Over $400K) Why it triggers: Higher audit rates kick in at $400K+ annually, especially if your income includes self-employment, capital gains, or cryptocurrency. How to avoid it: Document everything. Keep detailed records of all income sources, track large gains with related expenses and transaction histories, and for crypto, track every single trade. IRS matching programs compare what you report with what employers and brokerages report. Discrepancies = audit. 2. Excessive or Unusual Deductions Why it triggers: When deductions are disproportionately large compared to your income bracket, red flags go up. Large charitable donations, medical expenses, and business write-offs get scrutinized. Claiming 100% business use of a vehicle or home office without proper documentation is audit bait. How to avoid it: Benchmark your deductions against IRS averages for your income level. For charitable gifts over $500 (non-cash), include Form 8283. Keep logs for mileage, travel, and business use of home or car. If claiming a home office, document square footage, exclusive use, and related expenses. A taxpayer earning $75K claiming $30K in charitable donations is more likely to be flagged than someone earning $300K making the same donation. 3. Unreported Income (Including Side Hustles) Why it triggers: Many taxpayers forget income from side hustles or digital platforms like Etsy, Airbnb, or freelance work. Reporting rules changed significantly in 2025 and 2026. How to avoid it: The One Big Beautiful Bill Act (OBBBA) reversed the planned $600 threshold for third-party settlement organizations (Venmo, PayPal, Etsy). The threshold is back to $20,000 and 200 transactions for 2026. The 1099-NEC and 1099-MISC thres

High income, excessive deductions, unreported income, filing errors — what triggers IRS attention in 2026.

Emily Asher
March 29, 2026