Cal. Gov't Code § 16302.1
(a) Whenever any person pays to any state agency pursuant to law an amount covering taxes, penalties, interest, license, or other fees, or any other payment, and it is subsequently determined by the state agency responsible for the collection thereof that this amount includes an overpayment of ten dollars ($10) or less of the amount due the state pursuant to the assessment, levy, or charge to which the payment is applicable, the amount of the overpayment may be disposed of in either of the following ways: