Mo. Rev. Stat. § 50.340
All county officers, excepting public administrators and notaries public, in all counties of class one shall be compensated for their services by salaries only. It shall be the duty of any such county officer in any such county to charge on behalf of the county every fee that accrues in or to his office and to receive the same and all fees, fines, costs, commissions, penalties and charges that may be taxed in his office. All such fees, fines, costs, commissions, penalties and charges imposed by law and collected by such officer shall be paid into the county treasury and become the property of the county. The county commission of such counties shall determine by a proper order when such fees, fines, costs, commissions, penalties or charges so collected by any of the officers of said county shall be paid and turned over to the county treasury and how they shall be accounted for. The county commission shall require a sworn or affirmed statement by each county officer, showing such items collected in detail, their source, character and the aggregate amount thereof, and shall require a copy of such sworn or affirmed statement to be filed in the office of the county clerk in said county. Nothing herein contained shall be construed to include the performance by the sheriff of his duties as trustee in any deed of trust or mortgage with power of sale, within the term "services" used herein.
§ 50.340, RSMo