Mo. Rev. Stat. § 144.710
From every remittance made by a vendor as required by sections 144.600 to 144.745 to the director of revenue on or before the date when the remittance becomes due, the vendor may deduct and retain an amount equal to two percent thereof.
(L. 1959 H.B. 35 § 10, A.L. 1984 H.B. 1533, et al.)
*This section was repealed by S.B. 153 & 97, 2021. Due to a delayed effective date, both versions are printed here.