Miss. Code § 27-55-19
There shall not be included in the measure of the tax levied hereunder any gasoline:
Except as provided in paragraphs (b) and (c) above, evidence of exempt transactions provided in this section and subsections thereof, satisfactory to the department, shall be submitted by the distributor desiring an allowance of said exemptions to the department with the payment of the excise tax on the gasoline on which the exemption is claimed. If the department decides that the distributor is entitled to the exemption and allowance claimed, it shall notify said distributor in writing of such allowance. The distributor shall then be allowed to deduct from the payments made in his next monthly report, after said allowance, the amount of tax which he paid on this exempted gasoline which amount shall be arrived at by taking the amount of exempted gasoline minus two percent (2%) allowed for evaporation, shrinkage and other losses on gasoline, and multiplying the remainder by the amount of excise tax per gallon. In cases where the amount of such tax cannot be absorbed on the estimated tax liability of the person making such payments during the next six (6) months, the amount shall be refunded to the taxpayer. Such amount shall be certified to the State Auditor of Public Accounts by the department. The said Auditor is hereby authorized to make such investigation and audit of the claim as he finds necessary. If he finds that the department is correct in its determination, the Auditor may issue his warrant to the State Treasurer in favor of the taxpayer for the amount of tax erroneously paid, such refunds to be made from current gasoline, or special fuel tax collections.
Except as otherwise provided in this section, in order to claim exemptions provided for under this article, the distributor of gasoline must file claims therefor within three (3) years from the date of sale or delivery; otherwise, claims for such exemptions shall be disallowed.
In case gasoline and special fuel on which the tax has been previously paid are accidentally mixed, the distributor of gasoline or other person owning such mixture may ship the mixture out of the State of Mississippi, or to a Mississippi refinery, and may claim credit for the gasoline and/or special fuel tax on the gasoline and special fuel so mixed. The distributor of gasoline or other person may also ship the mixture to a barge or pipeline storage terminal within the State of Mississippi to be brought up to gasoline specifications, or lowered to special fuel specifications, as the case might be, under the supervision of a representative of the department. It shall be the duty of the distributor of gasoline or other person to whom the mixed product belongs to notify the department immediately after knowledge that the mixture has occurred.
In case the distributor of gasoline or other person elects to ship the mixture to a barge or pipeline terminal for storage within this state, the department shall supervise the unloading of the mixture.
In order to perfect a claim for credit for the tax on the gasoline and special fuel constituting any such mixture, the distributor of gasoline or other person making the claim shall do so in writing and shall furnish proof satisfactory to the department that the mixture was either shipped out of this state or to a refinery or other approved place of storage within this state. The department shall notify the claimant, in writing, whether or not his claim is approved, and, if approved, the claimant may deduct the amount of the claim from his next tax report. No such claim shall be allowed unless filed within three (3) years after the date of such accidental mixture. Bonded distributors of gasoline having no gasoline tax liability with the department may assign such tax credit to a bonded distributor of gasoline having such tax liability.
No tax liability shall accrue against the operator of a refinery when shipments of gasoline are made from such refinery, either by common carrier or by tank trucks owned and operated by the operator of said refinery, to a tax-exempt account within this state or to another refinery within this state.
Provided, however, that when gasoline is withdrawn from the storage tank of a refiner or processor on which the tax is paid on such gasoline and it or any part thereof cannot be delivered to a purchaser, said refiner or processor may deduct the tax on all or that portion of such gasoline not delivered to a purchaser from its next gasoline distributor's tax report; provided that such refiner or processor submits with such tax report:
The United States government, the State of Mississippi, counties, municipalities, school districts and all other political subdivisions of the state, and entities described in Section 27-55-12(3) shall be exempt from Five and Four-tenths Cents (5.4¢) of the portion of the gasoline excise tax rate which exceeds Nine Cents (9¢) per gallon. Any exemption provided in this paragraph may be deducted without the prior approval of the department.
Miss. Code § 27-55-19