REG Tax Procedure · Updated November 2026
Tax Statute of Limitations: When Does the Clock Start?
Tax procedure questions become easier when you identify who wants to act and what event started the clock.
General assessment period
A standard assessment period applies after a return is filed under ordinary circumstances.
Longer periods
Different periods can apply for substantial omissions, specified foreign information issues, and other circumstances.
Fraud
Fraudulent returns can receive fundamentally different limitation treatment from ordinary returns.
Failure to file
If no return is filed, do not assume the ordinary filing-based statute simply expires.
Refund claims
The taxpayer's deadline for claiming a refund follows separate rules from the IRS assessment period.
The takeaway
There is no single statute-of-limitations number for every tax dispute.
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FAQ
Does fraud use the ordinary period?
Generally no.
Can refund and assessment deadlines differ?
Yes.
Should I use current tax procedure rules?
Yes.