Cal. Rev. & Tax. Code § 43155.01
(a) A person who fails to pay any generation and handling fee or installment, except amounts of determinations made by the California Department of Tax and Fee Administration under Article 2 (commencing with Section 43201), within the time required shall pay a penalty, plus interest at the modified adjusted rate per month, or fraction of a month, established pursuant to Section 6591.5, from the date on which the fee or the amount of fee required to be collected became due and payable to the state until the date of payment, as follows:
(b) For any person who fails to file a generation and handling fee return with the California Department of Tax and Fee Administration in accordance with this part within the time prescribed for the filing of a generation and handling fee return, a penalty shall be added on account of the delinquency, as follows: