California Code, Public Resources Code - PRC § 42886.1

(a) The California Department of Tax and Fee Administration, if it deems it necessary in order to ensure payment to or facilitate the collection by the state of the amount of fees, may require returns and payment of the amount of fees for a yearly period.

(b) On or before the 15th day of the month following each designated yearly period, a return for the preceding designated yearly period shall be filed with the California Department of Tax and Fee Administration in the form as the California Department of Tax and Fee Administration may prescribe.