Mo. Rev. Stat. § 136.160: Accounts and vouchers to be exhibited, when.

All officers and others bound by law to pay money directly to the director of revenue or the department of revenue shall exhibit their accounts and vouchers to the director of revenue on or before the thirty-first day of December, to be adjusted and settled, except the county collectors of revenue and collector-treasurers, who shall, immediately after their final settlement with the county commission on the first Monday in March in each year, exhibit their accounts and vouchers to the director of revenue for the amount due the state to be adjusted and settled.