California Code, Financial Code - FIN § 18626

(a) Two percent per month on that part of the unpaid principal balance of any loan up to, including, but not in excess of, one thousand dollars ($1,000).

(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.

(c) As an alternative to the charges authorized by subdivisions (a) and (b), a premium finance agency may contract for and receive charges at a rate not exceeding 1.6 percent per month on the unpaid principal balance.