Miss. Code § 27-51-23
Any person objecting to any portion or portions of the motor vehicle assessment schedule affecting him or her directly shall file a written objection and claim for adjustment, in triplicate, with either the board of supervisors of the county or the municipal board of the municipality or with both such boards, on a form to be designed and supplied by the tax commission. The motor vehicle owner shall set forth therein in detail the grounds for his objection and claim for adjustment, with a full and complete identifiable description of the subject motor vehicle.
If the board of supervisors or the municipal board, as the case may be, is of the opinion that the objection and claim for adjustment of the motor vehicle owner has sufficient merit, then the original and duplicate copies of the said objection and claim together with any recommendation made by either of the said governing boards shall be forwarded to the tax commission for approval or disapproval.
If the tax commission is of the opinion that the said objection contains sufficient merit, then the tax commission shall make whatever adjustment on such claim as in its judgment is fair and equitable; if, on the contrary, the tax commission is of the opinion that the said objection to the proposed assessment does not have sufficient merit then the tax commission shall disapprove the claim. In either case, the tax commission shall return the original copy of the objection and petition to the clerk of the board of supervisors or to the clerk of the municipal board, as the case may be, with its action duly stated thereon. The decision of the tax commission in disapproving such a claim shall be final as between the board of supervisors and/or the municipal board and the tax commission, and the clerk of the respective boards shall then notify the claimant that his adjustment claim has been disapproved by the tax commission.
A petition for adjustment originating in either the county or a municipality of the county, if approved by the tax commission, shall become effective, as approved, in both jurisdictions, and in cases where the county tax collector does not collect said taxes for the municipality, then it shall be the duty of the clerk of the jurisdiction in which the claim for adjustment originated to officially notify the tax collector of the other jurisdiction, by citing the minute record of such action and properly identifying the subject motor vehicle.
If the tax commission approves a claim for the reduction of a proposed assessed value of any specific motor vehicle, then upon receipt of such notice by the clerk of the board of supervisors of the county or by the clerk of the municipal board, as the case may be, a minute record shall be made and a certified copy of such action shall be furnished the tax collector, and in making his report, the tax collector shall cite on the ad valorem tax receipt and in his report the minute book and page as legal reason for such reduction in assessed value on any such motor vehicle. Under no circumstances shall a tax collector vary from the said adopted assessment schedule in calculating and collecting motor vehicle ad valorem taxes unless such petition for reduction has been approved by the tax commission, and the tax collector has filed in his custody written official authority therefor from the clerk of the respective board, and evidence of such action is cited as hereinabove provided. An adjustment of the proposed assessed value of one or more motor vehicles of a certain group or class, under this procedure, shall not affect the proposed assessed value of other motor vehicles of the same group or class.
Any taxpayer dissatisfied with any portion of the assessment schedule directly affecting him may pay the resulting tax under protest and sue for recovery of all or any portion of the tax paid, provided that he requests the tax collector to indicate on the tax receipt at the time the tax is paid that the said tax is being paid under protest. This recourse is available, however, only to the taxpayer who filed objection and adjustment claim to the proposed assessment during the time set for filing such objection, as provided hereinabove, excepting in cases where the cause for such protest originated subsequent to the time for filing such protest.
Miss. Code § 27-51-23