Mo. Rev. Stat. § 52.360
The county collector, in all counties of the first class not having a charter form of government and in all counties of the second class, shall deposit each day in the depositaries selected by the county for the deposit of county funds, all money received by him as county collector during the day previous, and make a daily report thereof to the county auditor, as provided in section 55.190. The interest on all money deposited by the county collector shall be computed upon the daily balances of the deposits, and all of the interest shall be paid and turned over to the county treasurer at the time and in the manner that the monthly settlement and payment are made by the collector, and the interest shall go to the general revenue fund of the county except as otherwise provided by law.
§ 52.360, RSMo