Miss. Code § 27-59-311
The tax levied in this article shall become due and payable on or before the twentieth day of the month succeeding the month in which the tax accrues. Each person liable for the tax levied in this article shall file with the department a monthly report setting forth the quantity of natural gas and/or locomotive fuel used in this state and any other information as may be deemed reasonably necessary for the administration of this article and shall remit the full amount of the taxes shown to be due.
Reports and payments must be electronically filed by the due date in order to be considered timely filed, except when the due date falls on a weekend or holiday, in which case such reports and payments must be electronically filed by the first working day following the due date in order to be considered timely filed.
The monthly report shall be prepared and filed with the department on forms prescribed by the department or with the approval of the department, on machine-prepared schedules. Such monthly reports shall be signed by the permittee or his duly authorized agent and contain a declaration that the statements contained therein are true and are made under the penalty of perjury.
Miss. Code § 27-59-311