Individuals most commonly draw IRS scrutiny when reported information does not align with third-party records or when returns show patterns that historically correlate with underreporting. Discrepancies between wage statements, bank interest, brokerage reports, Form 1099s, and what is claimed on a tax return are frequent triggers because the Internal Revenue Service receives matching data directly from employers and financial institutions. An audit does not necessarily imply fraud; many are routine reconciliations.
Reporting mismatches and data-driven selection
The IRS relies heavily on third-party reporting to identify returns for review. The agency compares income and deduction items reported by taxpayers with copies of Forms W-2 and 1099 filed by payers. The Government Accountability Office has documented how decreased enforcement resources have changed audit selection and how reliance on automated matching can lead to examinations when records diverge. Research by Joel Slemrod University of Michigan has long shown that the visibility of income through third-party reporting raises the likelihood a return will be examined and also increases voluntary compliance.
High-risk deductions, business income, and emerging issues
Certain return characteristics historically raise the probability of an audit. Large or unusual itemized deductions relative to reported income, repeated business losses, and Schedule C sole proprietor filings attract attention because they offer more opportunities to misstate income or claim nonbusiness expenses. The Internal Revenue Service has also signaled heightened focus on income from complex sources such as cryptocurrency and gig-economy payments where reporting can be incomplete. The Taxpayer Advocate Service National Taxpayer Advocate Erin M. Collins has highlighted the need for clear guidance to taxpayers in areas where rules, reporting, and enforcement priorities intersect.
Consequences for individuals can range from a simple request for documentation to a formal examination that results in additional tax assessments, interest, and civil penalties. Most audits are resolved without criminal referral. The selection mechanism matters: returns chosen by random statistical models, returns with obvious mismatches, and those flagged by informants or referrals each lead to different procedures and burdens for taxpayers.
Relevance and human context
For taxpayers, the practical implication is that accurate reporting and robust recordkeeping are the most effective defenses against audit friction. Cultural and occupational contexts also matter. Self-employed individuals and small business owners from communities with large informal economies may face disproportionate scrutiny because of higher reliance on cash transactions and less third-party documentation. Environmental or territorial factors, such as living in an area with concentrated industries that generate certain types of income, can also shape the IRS’s patterns of examination.
Both policy analyses and IRS publications point to resource limitations as a structural cause shaping who gets audited and why. Understanding these drivers helps taxpayers prioritize documentation and seek professional advice when handling complex income streams or atypical deductions.