Mo. Rev. Stat. § 321.240

To levy and collect taxes as herein provided, the board shall in each year determine the amount of money necessary to be raised by taxation, and shall fix a rate of levy which, when levied upon every dollar of the taxable tangible property within the district as shown by the last completed assessment, and with other revenues, will raise the amount required by the district annually to supply funds for paying the expenses of organization and operation and the costs of acquiring, supplying and maintaining the property, works and equipment of the district, and maintain the necessary personnel, which rate of levy shall not exceed thirty cents on the one hundred dollars valuation; may fix an additional rate, not to exceed ten cents on the hundred dollars valuation, the revenues from which shall be deposited in a special fund and used only for the pension program of the district, by submitting the following question to the voters: