Mo. Rev. Stat. § 67.070
If at the beginning of any fiscal year any political subdivision has not approved or adopted and filed the budget and the expenditure orders, motions, resolutions, or ordinances required herein for the current fiscal year, and except as otherwise provided by law or charter the several amounts authorized in the expenditure orders, motions, resolutions, or ordinances for the next preceding fiscal year for the objects and purposes specified therein, so far as the same shall relate to operation and maintenance expenses, shall be deemed to be reappropriated for the several objects and purposes specified in said expenditure orders, motions, resolutions, or ordinances, until such time as the budget and the expenditure orders, motions, resolutions, or ordinances for the current fiscal year are approved or adopted and filed as required herein.
§ 67.070, RSMo