Cal. Code Regs. tit. 10, § 2232.38
The insurer may cancel this policy at any time by written notice delivered to the employer, or mailed to the employer's last address as shown on the records of the insurer, stating when, not less than 31 days thereafter, such cancellation shall be effective; and after the policy has been continued beyond its original term the employer may cancel this policy at any time by written notice delivered or mailed to the insurer, effective on receipt or on such later date as may be specified in the notice. In the event of such cancellation by either the insurer or the employer, the insurer shall promptly return on a prorata basis the unearned premium paid, if any, and the employer shall promptly pay on prorata basis the earned premium which has not been paid. (In computing the prorata premium to be returned by the insurer or to be paid by the insurer or to be paid by the employer, any discounts in premium or premium rate actually allowed to the employer because of the longer periods for which premiums, at the time of the cancellation, had been paid or agreed to be paid shall be disregarded, and the prorata return or payment of premium will be computed upon the basis of the insurer's regular and customary premium or premium rate for the coverage of this policy.) Such cancellation shall be without prejudice to any claim originating prior to the effective date of such cancellation.
Instructions
1. Change without regulatory effect amending section filed 7-14-2021 pursuant to section 100, title 1, California Code of Regulations (Register 2021, No. 29). Filing deadline specified in Government Code section 11349.3(a) extended 60 calendar days pursuant to Executive Order N-40-20.