Miss. Code § 21-29-221
The ad valorem tax provided for in Section 21-29-219 shall be stopped by the municipality whenever the interest from the relief fund shall be sufficient to pay all disabilities and relief which are a charge against said fund and future requirements as determined by the Board of Trustees of the Public Employees' Retirement System of Mississippi. However, when the board of trustees determines that interest from said fund is insufficient to meet the charges of disability or relief, then said municipality shall reinstate said tax for the purpose of building up the relief fund until such time as the fund is actuarially sound, as determined by the Board of Trustees.
The board of trustees, for each municipality with a disability and relief fund for firemen and policemen, shall have prepared an actuarial study of the fund at least every four (4) years and report the findings to the Legislature of the State of Mississippi. The first study shall be filed with the Legislature in January 1980.
Miss. Code § 21-29-221