MO Rev Stat § 66.600 (2021)
2021 Missouri Revised Statutes|Title VI - County, Township and Political Subdivision Government|Chapter 66 - Constitutional Charter Counties, Miscellaneous Provisions|Section 66.600 - County sales tax authorized, when — form of ballot — rate — use of brackets authorized (St. Louis County).

Effective - 28 Aug 1991   66.600. County sales tax authorized, when — form of ballot — rate — use of brackets authorized (St. Louis County). — 1. The governing body of any county of the first class having a charter form of government and having a population of nine hundred thousand or more may, by adopting an ordinance, impose a countywide sales tax for the benefit of both the incorporated and the unincorporated areas of the county; except that no ordinance enacted pursuant to the authority granted by the provisions of sections 66.600 to 66.630 shall be at variance with the provisions as set forth in sections 66.600 to 66.630; and no ordinance shall be effective unless the governing body of the county submits to the voters of the county, at a countywide general or primary election or at a special election called for that purpose, a proposal to authorize the governing body of the county to impose a tax under the provisions of sections 66.600 to 66.630. The ballot of submission shall contain, but not be limited to, the following language:     ☐  For the sales tax     ☐  Against the sales tax   ­­If a majority of the votes cast on the proposal by the qualified voters voting thereon are in favor of the proposal, then the ordinance shall be in effect. If a majority of the votes cast by the qualified voters voting are opposed to the proposal, then the governing body of the county shall have no power to impose the tax herein authorized unless and until the governing body of the county shall again have submitted another proposal to authorize the governing body of the county to impose the tax under the provisions of sections 66.600 to 66.630, and such proposal is approved by a majority of the qualified voters voting thereon. If a county sales tax is imposed by the governing body of a county, no city sales tax may be imposed by any city, town or village which is wholly or partially within the county, pursuant to the provisions of sections 94.500 to 94.550, so long as the county sales tax is in effect within the city, town or village, and any city sales tax which may have been enacted prior to the effective date of the county sales tax as set forth in sections 66.600 to 66.630 shall be void and of no effect for that part of the city, town or village that is located within the taxing county on and after the effective date of the county sales tax as set forth in sections 66.600 to 66.630, but shall again become effective without further action if the county sales tax is repealed or becomes otherwise inapplicable within such city, town or village.  2. The sales tax may be imposed at a rate of one percent on the receipts from the sale at retail of all tangible personal property or taxable services at retail within any county adopting the tax, if the property and services are subject to taxation by the state of Missouri under the provisions of sections 144.010 to 144.525. ­­-------- (L. 1977 S.B. 234 § 1, A.L. 1978 H.B. 1642, S.B. 490, A.L. 1991 H.B. 29 merged with S.B. 34)  (2019) Classification in section has a rational basis and thus is not a special law violative of the Missouri Constitution. City of Chesterfield v. State, 590 S.W.3d 840 (Mo. banc).