An annual tax for each taxable year, computed in the manner and at the rates hereinafter provided, is hereby imposed upon the taxable income for such year of the following classes of taxpayers:
Minn. Stat. § 290.03
(2394-3) 1933 c 405 s 3; Ex1937 c 49 s 3; 1941 c 550 s 1; 1945 c 410 s 1; Ex1957 c 1 art 3; 1963 c 587 s 1; 1967 c 577 s 1; 1971 c 769 s 2; 1973 c 711 s 3; 1975 c 349 s 29; 1977 c 376 s 13; 1980 c 419 s 2; 1982 c 523 art 1 s 5; 1987 c 268 art 1 s 25