Mississippi Code Title 37. Education § 37-59-35

Whenever there shall be on hand in any bond and interest fund an amount in excess of the amount which will be required for expenditure therefrom within the then next succeeding twelve (12) months, the school board may use such excess amount to purchase the outstanding bonds of such school district which are payable from such fund whenever, in the judgment of such school board, the best interest of the district would be served thereby. When such bonds are purchased, they shall be cancelled and retired and shall not thereafter be resold or reissued. Nothing contained in this section shall be construed to prevent the payment of a portion of the earnings derived from the investment of the amounts in the bond and interest fund to the federal government to the extent required by the federal laws applicable to such bonds or the interest income thereon in order to maintain their tax exempt status.