How long do I have to claim a tax refund in California?

Federal refund claims must be filed within three years of the return or two years of the payment, whichever is later (26 U.S.C. § 6511). California allows four years from the return's due date, or one year from the overpayment (Revenue and Taxation Code section 19306). After the window closes, the refund is forfeited.

Refunds die quietly. The federal claim must be filed within three years of the original return or two years of the payment, whichever is later (26 U.S.C. § 6511), and a lookback rule caps recovery at amounts paid within that period; withholding is treated as paid on the April due date. California's window under Revenue and Taxation Code section 19306 is generally four years from the return's due date or one year from the date of overpayment, whichever is later. Non-filers face the harshest version: there is no penalty for filing late when a refund is due, but once the window passes the money is gone permanently. Federal law tolls the period for financial disability — a medically determinable impairment preventing the taxpayer from managing financial affairs (section 6511(h)). When an audit or litigation may change the answer later, a protective claim preserves the refund right. If a claim is denied, suit must follow within two years of the disallowance notice (26 U.S.C. § 6532).

Authority: 26 U.S.C. § 6511