Mississippi Code Title 27. Taxation and Finance § 27-19-15

(1) In addition to the privilege license tax otherwise levied for the operation of motor vehicles, there is hereby levied on each carrier of property for each motor vehicle, truck tractor or road tractor operated pursuant to the provisions of Section 63-5-47, Mississippi Code of 1972, an annual highway privilege tax of Eight Dollars and Fifty Cents ($8.50) per one thousand (1,000) pounds, or fractional part thereof, in excess of the maximum gross weight on which an annual highway privilege tax has been otherwise paid for said vehicle, said tax to be paid to the Mississippi Department of Transportation.

(2) Each and every vehicle subject to the tax levied hereby shall be issued a special permit by the Mississippi Department of Transportation, which permit, or a certified copy thereof, shall be carried by the operator of any such vehicle at all times.