Oregon Revised Statutes Insurance § 746.485

(1) A premium finance company shall not charge, contract for, receive, or collect a service charge other than as permitted by ORS 746.405 to 746.530.

(2) The service charge is to be computed on the balance of the premiums due (after subtracting the down payment made by the insured in accordance with the premium finance agreement) from the effective date of the insurance coverage, for which the premiums are being advanced, to and including the date when the final payment of the premium finance agreement is payable.

(3) The service charge shall not exceed interest at a rate authorized under this subsection plus an additional charge of 10 percent of the amount financed or $50, whichever amount is less, per premium finance agreement. The additional charge need not be refunded upon cancellation or prepayment. The rate of interest charged by a premium finance company on the amount of financed premium shall not exceed the nominal annual rate of five percentage points in excess of the discount rate, and any surcharge thereon, on 90-day commercial paper in effect at the Federal Reserve Bank in the Federal Reserve District which includes Oregon on the effective date of the insurance coverage or 18 percent, whichever is greater.

(4) Any insured may prepay the premium finance agreement in full at any time before the due date of the final payment. In such event the unearned interest shall be refunded. The amount of any such refund shall be the total amount of interest due on the agreement less the interest earned to the installment date nearest the date of payment, computed by applying the actuarial method based on the annual percentage rate set forth on the premium finance agreement.