Mo. Rev. Stat. § 148.050
148.050 Returns, when filed.
148.050. Returns, when filed. — Every taxpayer shall file a return with the director on or before the fifteenth day of April in each taxable year.
(L. 1945 p. 1921 § 4, A. 1949 S.B. 1031, A.L. 1969 3d Ex. Sess. H.B. 25, A.L. 1982 H.B. 1351, et al., A.L. 1986 H.B. 1195) Effective 5-15-86