Cal. Rev. & Tax. Code § 7659.2

Except in the case of a person required to remit amounts due in accordance with Article 2.5 (commencing with Section 7659.9), for purposes of Section 7659.1, each prepayment shall be accompanied by a report of the amount of that prepayment in a form prescribed by the board and shall be filed with the board on or before the 15th day following each monthly period together with a remittance payable to the Controller of the amount due.