Miss. Code Ann. § 27-31-29

Any single-family dwelling, including a condominium unit which was built, or caused to be built, to completion on or after January 1, 1983, and is and always has been owned by the person, or his or her donee, who built or caused such dwelling to be built, shall, upon presentation of an affidavit to the tax assessor certifying that such dwelling or any part thereof has never been leased, rented, sold or occupied, be exempt from ad valorem taxation until the time that such dwelling is first leased, rented, sold or occupied. Said affidavit shall be filed not later than April 1 of each year for which an exemption is claimed. In such cases ad valorem taxes shall be assessed and levied on the value of the unimproved property where such dwelling is situated.