Mo. Rev. Stat. § 50.620
If at the termination of any fiscal year in counties of classes one and two the appropriations necessary for the support of the government for the ensuing year have not been made, the several amounts appropriated in the last annual appropriation order for the objects and purposes therein specified, so far as they relate to operation and maintenance expenses, are deemed to be reappropriated for the several objects and purposes specified in the appropriation order; and until the county commission acts, the accounting officer shall authorize expenditures and draw warrants in payment thereof, and the warrants shall be countersigned and paid for the support of the government on the basis of the appropriation for the preceding fiscal year.
§ 50.620, RSMo