Mo. Rev. Stat. § 144.060
It shall be the duty of every person making any purchase or receiving any service upon which a tax is imposed by sections 144.010 to 144.510 to pay, to the extent possible under the provisions of section 144.285, the amount of such tax to the person making such sale or rendering such service. Any person who shall willfully and intentionally refuse to pay such tax shall be guilty of a misdemeanor. The provisions of this section shall not apply to any person making any purchase or sale of a motor vehicle subject to sales tax as provided by the Missouri sales tax law, unless such person making the sale is a motor vehicle dealer authorized to collect and remit sales tax pursuant to subsection 10* of section 144.070.
§ 144.060, RSMo
RSMo 1939 § 11412, A.L. 1941 p. 698, A.L. 1943 p. 1012, A.L. 1945 p. 1865, A.L. 1947 V. II p. 431, A.L. 1951 p. 854, A.L. 1965 p. 261, A.L. 2009 H.B. 683