Section 345.070 - Amendment of Contract(a) On request of the retail buyer, the holder of a retail installment contract may: (1) amend the contract to renew, restate, or reschedule the unpaid balance of the contract; and(2) collect an amount computed on the principal balance of the amended contract for the term of the amended contract at the applicable rate under Section 345.055, 345.056, 345.057, or 345.058.(b) The principal balance of the amended contract is computed by: (1) adding: (A) the amount of the unpaid balance on the date of the amendment;(B) the cost of insurance;(C) the amount of each additional necessary official fee; and(D) the amount of each accrued delinquency charge; and(2) subtracting from the total computed under Subdivision (1) an amount equal to the minimum refund credit that would be required under Section 345.075 or 345.076 for prepayment in full on the date of the amendment. Acts 1997, 75th Leg., ch. 1008, Sec. 1, eff. 9/1/1997.