Section 18.03.05.017 - REFUND FORMULAS01.Filing and Approval by the Director. Any refund formula that is at least as favorable to the insured debtor as the "sum of the digits" formula, or the "Rule of 78," for single premium decreasing or disability plans or pro-rata for other plans, will be deemed acceptable.02.Termination. In the event of termination, no charge for credit insurance may be made for the first fifteen (15) days of a loan month and a full month may be charged for sixteen (16) days or more of a loan month.03.Minimum Refund. No refund of five dollar ($5) or less need be made.Idaho Admin. Code r. 18.03.05.017