It depends on your state and the type of tax. Three years is a common state audit period, but it is not universal: Minnesota, for example, generally allows 3½ years for individual income tax returns. The clock may start from the later of the return’s due date or filing date, and exceptions can extend the period or remove the usual limit altogether.
How to find the deadline for your return
Start with the state and tax type shown on the return or audit notice. Then check the current rule from that state’s revenue agency and identify the return’s due date, filing date, and any event that could change the deadline. A period described for individual income tax may not apply to sales, business, or other state taxes.
The examples below show why a general three-year rule is only a starting point. They are not a 50-state survey, and the rules cited are specific to the state and tax context described.
How state audit periods differ
| State and tax context | Ordinary period and measurement | Important qualifications |
|---|---|---|
| Minnesota individual income tax | 3½ years after the return is due or filed, whichever is later, according to the Minnesota Department of Revenue’s page last updated December 12, 2025. | No time limit if no return was filed; the agency says it may extend the period in certain situations. Minnesota Department of Revenue |
| Utah individual income tax | Generally, three years from the later of the due date or filing date. | The assessment period does not start until a return is filed. Exceptions include substantial error, certain federal return changes not reflected on the state return, and fraud. Utah State Tax Commission |
| Georgia state tax liabilities | Normally, three years to assess additional tax. | Six years for omission of more than 25% of gross income; no limit for fraud or failure to file. Certain qualifying refund claims filed near the period’s end extend the assessment period by six months. Georgia Department of Revenue |
| Massachusetts returns | Generally, three years from the due date or actual filing date, whichever is later. The Massachusetts Department of Revenue stated this in AP 609, dated January 30, 2026. | If no return or a fraudulent return was filed, the agency says it may assess at any time. Massachusetts Department of Revenue |
| Mississippi audits | Generally, an audit covers three years, but the 36-month rule’s measurement depends on the tax type and due or filing date. | No limitations period applies to periods for which no return was filed. Mississippi Department of Revenue |
| Virginia tax assessments | The Virginia Tax ruling describes a general three-year period. | It describes a six-year period for specified fraudulent or false-return and failure-to-file circumstances. The rule cited is Virginia-specific. Virginia Tax, ruling 20-151 |
| Maine audits | Generally, three years after filing or the due date, whichever is later. | The agency FAQ says some circumstances allow up to six years or no time limit, and that a taxpayer may be asked to sign an extension agreement. Verify the applicable statute and circumstances. Maine Revenue Services |
What date starts the clock?
In several of these examples, the period is measured from whichever is later: the return’s due date or the date it was filed. That means filing early does not necessarily make the audit window expire earlier than the due-date-based calculation. A late-filed return can also have a later starting point. The exact trigger depends on the state’s rule and the tax involved.
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Keep the filed return and proof of filing so you can establish the relevant date. If you received an extension to file, check the state’s instructions for how that affects the due date used in the calculation; do not assume the federal and state calculations match.
When the usual period may not protect you
States may provide a longer period—or no usual time limit—for particular circumstances. The examples above include unfiled returns, fraud, and substantial income omissions. The thresholds and consequences are not interchangeable: Georgia’s more-than-25% omission rule, for example, is a Georgia rule, not a nationwide standard.
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Other events can also affect timing. Minnesota says the limit may be extended in certain situations. Georgia describes a six-month extension after a qualifying refund claim filed near the end of its assessment period. Maine says the taxpayer may be asked to agree to an extension. Read any proposed agreement carefully; signing can change the time available to assess tax.
A state audit deadline is not the IRS deadline
The IRS usually has three years to assess federal tax, measured from the return’s due date (including extensions) or, for a late-filed return, the date it received the return, whichever is later. Federal exceptions include failure to file, an agreement extending the time, certain large income omissions, and fraud. That federal rule does not determine when a state may audit or assess state tax. IRS: Time you can claim a credit or refund
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If you have received a state audit notice
Do not rely on the audit-period calculation as your response deadline. A notice may set a separate deadline to provide records, respond to proposed changes, or appeal an assessment. Follow the dates and instructions on the notice, and verify the applicable state rule with the revenue agency. If the amount is significant or you dispute the state’s position, consider consulting a qualified tax professional familiar with that state.
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