IRS Audit Triggers

An IRS audit rarely starts at random. Most begin when something on a return conflicts with information the IRS already holds, or when a return scores unusually against comparable filers. Knowing what typically draws attention is the first step toward lowering your risk.

Audits fall into two broad categories: those flagged by a genuine pattern in the numbers, and those chosen through computer screening or research sampling. Neither one means wrongdoing occurred, but each tells an examiner where to look first. The most common triggers are:

• Repeated patterns across consecutive years, such as excessive deductions or donations claimed again and again, rather than a single unusual year
• Income that is unreported or missing, especially freelance or outside work that does not match records the IRS receives from banks, clients, or platforms like PayPal
• Income that changes drastically from one year to the next, for an individual filer or a business, such as a couple reporting $200,000 one year and $30,000 the next without a clear explanation
• Business losses claimed repeatedly, or in amounts that make the IRS question how the business stays open, especially in an industry that should otherwise be thriving
• Deductions that are excessive or disproportionate to reported income, including home office and equipment expenses that do not fit the business
• Charitable donations that are large relative to income
• Rounded numbers, since returns are expected to be accurate to the penny, and cryptocurrency transactions, which the IRS now tracks closely
• Random computer screening, which compares a return against statistical norms for similar filers regardless of any error

Each trigger points an examiner toward a different part of the return. The type of audit you receive, correspondence, office, or field, shapes how you should respond; see types of IRS audits for what to expect from each.

How to reduce your risk

There is no guaranteed way to avoid an audit, but a few habits meaningfully lower the odds. Tax returns are legal documents, and while a preparer can be held responsible for their own mistakes, every filer is ultimately responsible for the accuracy of the information reported on the return.

Many individuals and business owners prepare their own returns, with or without tax software, rather than working with a professional. That is not itself a risk factor, but it does mean the accuracy of every entry rests on the filer. A little extra care before filing is usually worth more than a fast one.

• Maintain thorough, organized records throughout the year
• Report every source of income, including freelance and outside work
• Recheck the return for math errors before filing
• Never make a false or inflated claim on a return
• Keep business and personal finances separate
• Double-check entries when using tax software or a preparer's draft
• Consult an attorney before filing if a deduction or a prior year's return raises questions

Most audits end with additional documentation confirming the return was accurate, not with a finding of fraud. If a notice has already arrived, see preparing for an audit for the practical steps, or return to our IRS audits overview for how the process works from notice to resolution.