Cal. Fin. Code § 18626
A premium finance agency may, in a premium finance agreement, contract for, charge, receive, and collect a finance charge which shall not exceed in the aggregate:
(b) One percent per month on any remainder of such unpaid principal balance in excess of one thousand dollars ($1,000).
As used in this article “consumer insurance premium finance loan” shall mean an insurance premium finance loan where the insurance policies which are security for the loan are for personal, family or household use.