Common IRS Audit Triggers and How to Avoid Them

Published: March 15, 2026 | Author: Editorial Team | Last Updated: March 15, 2026

Published on ataxman.com | March 15, 2026

An IRS audit is a formal examination of your tax return. The overall audit rate is quite low — less than 0.5% of all individual returns — but certain return characteristics significantly increase the probability of selection. Understanding what draws IRS attention helps you file accurately while maintaining proper documentation for any claims that might be scrutinized.

How the IRS Selects Returns

The IRS uses the Discriminant Information Function (DIF), a computerized scoring system that compares your return to statistical norms for your income level and industry. High DIF scores indicate entries significantly outside the norm. Returns can also be selected through related audits (if your business partner is audited, you may be too), through information return matching (comparing your reported income to W-2s and 1099s filed by payers), and through specific compliance campaigns targeting known problem areas.

High-Income Returns

The IRS allocates audit resources where they can collect the most revenue. Returns with adjusted gross income over $1 million are audited at approximately 2.5% to 3% in recent years. Even returns over $200,000 face elevated scrutiny. This is not an argument to under-report income but context for understanding that more complex, higher-income returns attract proportionally more IRS attention.

Large Deductions and Schedule C Losses

The DIF system compares your deductions to statistical averages for your income level. Charitable contributions, home office deductions, business meals, and business losses significantly above average will increase your DIF score. If you report losses from a business activity for multiple consecutive years, the IRS may question whether it is a legitimate business or a hobby loss. The general presumption is that a business that shows a profit in at least 3 of 5 consecutive years is operated for profit.

Important note: The goal is not to avoid legitimate deductions out of fear of audit. If you have proper documentation and the deduction is legally valid, you are entitled to claim it. The goal is to understand where extra documentation is most important.

Incomplete or Mismatched Information Returns

The IRS receives copies of all W-2s and 1099s filed by employers and payers and automatically matches these against your return. Failing to report a 1099 you received — even a small one — will be caught and trigger an IRS notice. Always ensure all income reported to you is reflected on your return. If a 1099 is wrong, contact the issuer to correct it rather than simply omitting it.

If You Are Audited

Most audits are correspondence audits — IRS letters requesting documentation for a specific item. Respond promptly, provide the requested documentation, and consider whether professional representation is warranted. For field or office audits, having a qualified CPA or EA represent you is strongly advisable. Do not provide more information than specifically requested.

Read more about tax compliance on our tax resource blog, or schedule a consultation to review your return before filing.

Disclaimer: Audit selection rates and specific triggers change based on IRS enforcement priorities. This article is for general educational purposes and is not legal or tax advice. Consult a qualified CPA, enrolled agent, or tax attorney for guidance specific to your situation.