The IRS doesn't audit randomly. Their selection process is driven by statistical models, third-party reporting mismatches, and specific red flags that signal potential non-compliance. Understanding what triggers audits is the first step to avoiding them.
For restaurant owners, the most common triggers are: cash-intensive business with unusually low reported income, large discrepancies between Form 1099-K figures and reported revenue, high meal and entertainment deductions relative to revenue, and inconsistent year-over-year income patterns.
For high-income individuals, the triggers shift: Schedule C losses that offset W-2 income for multiple years, large charitable deductions (especially non-cash), home office deductions, and foreign accounts or income.
The DIF score — Discriminant Information Function — is the IRS's primary selection tool. It scores each return against statistical norms for your income level and business type. Returns that score significantly above average are flagged for review.
The good news: most of these triggers can be managed. Large deductions need documentation. Income needs to reconcile with third-party reporting. Unusual items need a clear narrative. The goal isn't to avoid legitimate deductions — it's to make your return defensible if it's ever examined.
If you're uncertain about your exposure, a pre-audit review with a tax resolution specialist can identify potential issues before the IRS does — and that proactive positioning makes all the difference.
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