What Is the Statute of Limitations for State Tax Assessments on Former Residents Abroad?

States generally have 3 to 4 years from the date you file a return to assess additional tax or challenge your residency status. However, if you never filed a final part-year return when you left, most states treat the statute of limitations as open indefinitely, meaning they can come after you years or even decades later (California FTB: Your Tax Audit).

State-by-state statute of limitations:

Why the “no return filed” rule matters for expats:

• Many expats never file a final part-year return when they move abroad, especially if they believe they have no state-source income
• The state presumes continued residency, and the statute never starts running
• 10 or 15 years later, the state discovers the expat through information sharing (IRS data, W-2 reporting, property records) and issues a notice for all open years
• The resulting assessment covers worldwide income for every year the state claims you were a resident, plus interest and penalties

How to protect yourself:

• File the final part-year return even if you owe nothing. This starts the statute of limitations clock.
• Keep documentation for at least 7 years: departure evidence, new domicile proof, travel logs
• Respond to state notices promptly: Ignoring a notice results in a default assessment that is much harder to reverse
• Request abatement of penalties if you have reasonable cause for late filing (living abroad with no state-source income is often accepted)

Special rules:

• Fraud: no statute of limitations, ever
• 25% or more understatement: some states extend the period to 6 years
• Voluntary disclosure programs: Some states offer amnesty for former residents who come forward; California and New York have used these periodically

For more, see our State Taxes for Expats guide.