31-1-241. Finance charge limitation. (1) Notwithstanding the provisions of any other law, the finance charge included in a retail installment contract shall be at a rate agreed upon by the retail seller and the buyer.
     (2) Notwithstanding the provisions of any other law, the finance charge included in a retail charge account agreement shall be at a rate agreed upon by the retail seller and the buyer.
     (a) Except as provided in subsection (2)(b), the finance charge shall be computed from month to month (which need not be a calendar month) or other regular billing cycle period by using the average daily balance of the account during the billing cycle without including in the computation the amount of purchases charged to the account during that billing cycle.
     (b) Nothing in this section prevents a retail seller and a buyer from agreeing to the computation of the finance charge by using the ending balance of the account as of the last day of the billing cycle period less the amount of purchases charged to the account during that billing cycle.
     (3) A seller may change the terms of a revolving charge account whether or not the change is authorized by prior agreement. The seller shall give the buyer written notice of any change in the two billing cycles prior to the effective date of the change.
     (4) If the retail seller increases his finance charge on a retail charge account agreement, then such increased rate may only be applied to the balance consisting of purchases on other charges incurred on or after the effective date of the increase.
     (5) For purposes of determining the balance to which the increased rate applies, all payments may be considered to be applied to the balance existing prior to the change in rate until that balance is paid in full.
     (6) If the finance charge determined pursuant to subsection (2) for a monthly period is less than 50 cents, a maximum finance charge not in excess of 50 cents may be charged and collected for such period.

     History: En. Sec. 8, Ch. 282, L. 1959; amd. Sec. 11-152, Ch. 264, L. 1963; amd. Sec. 2, Ch. 416, L. 1971; amd. Sec. 1, Ch. 252, L. 1975; amd. Sec. 1, Ch. 284, L. 1977; R.C.M. 1947, 74-608; amd. Sec. 2, Ch. 160, L. 1979; amd. Secs. 1, 2, Ch. 276, L. 1981; amd. Secs. 1, 3, Ch. 22, L. 1983; amd. Sec. 2, Ch. 297, L. 1987.