IRS reviews, or audits, are primarily triggered by discrepancies in reported income, high-ratio deductions, and automated screenings that flag anomalies. Key triggers include mismatched W-2/1099 forms, unreported freelance income, excessive charitable donations, business losses on Schedule C, and high-income levels.
That being said, it's important to be aware of “triggers” for IRS audits, below is a list of some of the more egregious items.
The IRS uses a combination of automated and human processes to select which tax returns to audit. Not reporting all of your income is an easy-to-avoid red flag that can lead to an audit. Taking excessive business tax deductions and mixing business and personal expenses can lead to an audit.
District offices select returns randomly sometimes for special research programs, but generally the returns are selected because they have good audit potential. The potential is discovered by a computerized system called the Discriminant Function System (DIF). In most cases, the decisionmaker is not the auditor.
If the IRS is reviewing your return, it may have questions about your wages and withholding, or credits or expenses shown on your tax return. The review process could take anywhere from 45 to 180 days, depending on the number and types of issues the IRS is reviewing.
As your family's income and assets increase, so does the likelihood of drawing attention from tax authorities. And with the IRS now using data analytics to help flag returns with certain markers, it's important to understand the most common audit triggers and ways to manage this risk.
The IRS reviews some federal tax returns to determine if income, expenses, and credits are reported accurately. The IRS selects returns for review using various methods; including random sampling, computerized screening, and comparison of information received by the IRS such as Forms W-2 and 1099.
Remember, you will be contacted initially by mail. The IRS will provide all contact information and instructions in the letter you receive. If we conduct your audit by mail, our letter will request additional information about certain items shown on the tax return such as income, expenses, and itemized deductions.
If the deductions, losses, or credits on your return are disproportionately large compared with your income, the IRS may want to take a second look at your return. Taking a big loss from the sale of rental property or other investments can also spike the IRS's curiosity.
Here's a list of seven symptoms that call for attention.
You know the IRS might be investigating you through official mail (first contact), phone calls (often with automated messages to IRS.gov), or in-person visits, but signs of a criminal probe include contact with IRS Criminal Investigation (CI) agents, subpoenas to you or your bank, questions to your accountant/bank, unusual account activity (freezing/refusing transactions), or agents suddenly going silent after an audit. Key indicators are official IRS letters, contact from CI special agents, third-party inquiries, and formal summonses for records, signaling serious scrutiny beyond a simple audit.
The IRS does not check every tax return. It does not check the majority of them, but the IRS implements methods that track certain factors that would result in a further examination or audit by them.
What happens during an audit? Internal audit conducts assurance audits through a five-phase process which includes selection, planning, conducting fieldwork, reporting results, and following up on corrective action plans.
Who Is Audited More Often? Oddly, people who make less than $25,000 have a higher audit rate. This higher rate is because many of these taxpayers claim the earned income tax credit, and the IRS conducts many audits to ensure that the credit isn't being claimed fraudulently.
However, the IRS is unfortunately not bound by this law. This means that they can choose how much to garnish from your wages each month, depending on how much you owe and how much you earn. The limit is typically between 25-50% of your disposable earnings after deductions are made.
At a glance: The gift giver pays any gift tax owed, not the receiver. You don't have to report gifts to the IRS unless the amount exceeds $19,000 in 2025. Any gifts exceeding $19,000 in a year must be reported and contribute to your lifetime exclusion amount.
Common IRS audit triggers
See our Held or Stopped Refund page or the TAS video for more information. If the IRS is reviewing your return, the review process could take anywhere from 45 to 180 days, depending on the number and types of issues the IRS is reviewing. Follow these steps if you know you made a mistake, before the IRS contacts you.
What should I do? Request an expedited refund by calling the IRS at 800-829-1040 (TTY/TDD 800-829-4059). Request a manual refund expedited to you.
Owning a small business such as auto dealership, a restaurant, a beauty salon, a car service or cannabis dispensary is an IRS red flag, as they typically have many cash transactions. Red flags are also raised on outliers – businesses with margins that are too low or too high.
A tax audit doesn't automatically mean you're in trouble. While it's true that the IRS can audit people suspected of doing something wrong, that's not always the case. As part of the audit process, the IRS audits a random portion of the taxpaying public every year.