Cal. Ins. Code § 15055

Notwithstanding Section 15054, the commissioner may establish license periods and renewal dates for all licenses issued pursuant to this chapter so as to distribute the renewal work to permit the most efficient and economic use of personnel and equipment. In such cases, to the extent practical, provisions shall be made for the proration or other adjustment of fees so that no person shall be required to pay more than that which he or she would have been required to pay and no change in license period or renewal date shall be made.