Cal. INS § 1735.5

A property broker-agent, casualty broker-agent, or surplus line broker, hereinafter the “licensee,” may offset funds due an insured for return premiums on any policy against amounts due the licensee from the same insured for unpaid premiums on the same or any other policy. Any insurer may pay return premiums to any property broker-agent or any casualty broker-agent for that purpose. This section shall not invalidate an assignment of return premium made concurrently with policy issuance as security for financing that premium, nor the right of the assignee, or the assignee’s assign, to enforce the assignment as a prior claim.