Miss. Code § 63-19-47
Notwithstanding the provisions of any retail installment contract to the contrary, any buyer may pay in full at any time before maturity the debt of any retail installment contract and in so paying such debt shall receive a refund credit thereon for such anticipation of payments provided such contract shall have a precomputed finance charge. The amount of such refund shall be calculated on the rule of the sum of the digits, commonly known as the "Rule of 78ths," after deducting from such refund an acquisition cost of Ten Dollars ($10.00). Where the amount of credit is less than One Dollar ($1.00), no refund need be made. In the event the finance charge on a contract evidencing the sale of a commercial vehicle is not precomputed, any buyer may pay in full at any time before maturity the then remaining unpaid principal balance of the contract and shall pay a penalty for such prepayment as may have been agreed to by the buyer and the seller in the contract, not to exceed Fifty Dollars ($50.00).
The provisions of this section shall apply in the event the vehicle is repossessed by the finance company or the dealer, and the dealer is required to pay the balance of indebtedness due the holder thereof.
Miss. Code § 63-19-47