Cal. Fin. Code § 8035

If any domestic association proposes to acquire the assets of any federal association or any state or national bank by transfer, conversion, or otherwise, the initial assessment provided for by this article shall be computed on the same basis as if the federal association or state or national bank had been an association and assessed on or before the 20th day of June in the fiscal year preceding the initial assessment, except that the initial assessment shall be based on the assets of the federal association or of the state or national bank, as shown by the institution’s report to the Office of Thrift Supervision, the commissioner, or the Comptroller of the Currency, respectively, next preceding the 20th day of June in the fiscal year preceding the initial assessment and the assessment shall be reduced, if the certificate of authority is not issued in July, by one-twelfth for each full month of the fiscal year which has expired at the time of the issuance of the certificate of authority and shall be payable in full on the date of issuance.