IRS Audit Statute of Limitations Overview

Quick answer: For most individual income tax returns, the IRS generally has 3 years from the date you filed your return (or its due date, whichever is later) to assess additional tax. However, this period can be shortened, lengthened, or made indefinite depending on the situation.

Explanation

The standard rule, as described in IRS Publication 530, is that records that support an item of income, a deduction, or a credit appearing on a return should be kept until the period of limitations for the return runs out — a period of time after which no legal action can be brought — which for assessment of tax you owe is generally 3 years from the date you filed the return.¹ The same 3-year window applies to claims for refund: for filing a claim for credit or refund, this is generally 3 years from the date you filed the original return, or 2 years from the date you paid the tax, whichever is later, and returns filed before the due date are treated as filed on the due date.²

A few important variations appear in the documents:

• Shortening it (estates): A personal representative of an estate can request a faster assessment. The IRS ordinarily has 3 years from the date an income tax return is filed, or its due date, whichever is later, to charge any additional tax due, but a personal representative may request a prompt assessment of tax after the return has been filed, which reduces the time for making the assessment to 18 months from the date the written request was received.³

• Extended for underreported income or fraud (estates): If you or the decedent failed to report substantial amounts of gross income (more than 25% of the gross income reported on the return) or filed a false or fraudulent return, a request for prompt assessment won't shorten the period during which the IRS may assess the additional tax.⁴

• Employee Retention Credit claims: The IRS will have 6 years to review and audit claims for the ERC for accuracy — during this period it can disallow any or all of an ERC claim and charge penalties — whereas the statute of limitations is usually 3 years.⁵

• Special disability-related refund claims: For certain retroactive VA disability determinations, the general 3-years-from-filing/2-years-from-payment rule is extended by a 1-year period beginning on the date of the determination, applying to claims filed after June 17, 2008, but not to any tax year that began more than 5 years before the determination.⁶

What it depends on:

• Whether the return understated gross income substantially or involved fraud (no time limit, or a much longer one, may apply — though the specific "no limit" fraud rule isn't detailed in these excerpts)
• The type of return (individual, estate, ERC claim, etc.)
• Whether a special election (like prompt assessment) was made

Because the exact rules for unfiled returns, fraud, or substantial omissions of income can extend the audit window well beyond 3 years, and these documents don't fully spell out every exception, it's worth discussing your specific filing history with a CPA to confirm which limitations period applies to you.