Mo. Rev. Stat. § 301.050

All registration fees shall be payable to the director of revenue and shall accompany the application for registration. A penalty fee of five dollars shall be paid on all delinquent registrations. Any motor vehicle on which the annual registration fee falls due prior to September 1, 1984, and which is delinquent shall thereafter be registered by the department of revenue to renew that annual registration at the fee in effect when the annual registration was due plus the penalty provided in this section.