Miss. Code § 27-35-525
It shall be the duty of all railroads operating in the State of Mississippi to furnish to the Mississippi state tax commission, on blanks to be furnished by the said commission to the railroad companies operating in the State of Mississippi, a true and accurate record of the car mileage made by the cars of the said companies, as defined above, over their rails within the State of Mississippi during the preceding calendar year. Said reports shall be duly attested by the proper officers of said railroad companies and shall be filed in the office of the Mississippi Tax Commission on or before the first day of May of each calendar year, or as soon thereafter as they can practically be compiled. Said reports shall become delinquent on and after the first day of June of the year in which they are due, and the officers of any railroad company failing to make the reports hereinbefore provided shall be deemed guilty of a misdemeanor, and on conviction thereof shall be fined not exceeding one hundred dollars, or in default of payment thereof imprisoned not exceeding thirty days.
Miss. Code § 27-35-525