1. 1. The Missouri taxable income of a corporation taxable under sections 143.011 to 143.996 shall be so much of its federal taxable income for the taxable year, with the modifications specified in subsections 2 and 3 of this section, as is derived from sources within Missouri as provided in section 143.451. The tax of a corporation shall be computed on its Missouri taxable income at the rates provided in section 143.071.
2. 2. There shall be added to or subtracted from federal taxable income, the modifications to adjusted gross income provided in section 143.121 and the applicable modifications to itemized deductions provided in section 143.141. There shall be subtracted the federal income tax deduction provided in section 143.171. There shall be subtracted, to the extent included in federal taxable income, corporate dividends from sources within Missouri.

3. 3.

   1. (1) If an affiliated group of corporations files a consolidated income tax return for the taxable year for federal income tax purposes and fifty percent or more of its income is derived from sources within this state as determined in accordance with section 143.451, then it may elect to file a Missouri consolidated income tax return. The federal consolidated taxable income of the electing affiliated group for the taxable year shall be its federal taxable income.
   2. (2) So long as a federal consolidated income tax return is filed, an election made by an affiliated group of corporations to file a Missouri consolidated income tax return may be withdrawn or revoked only upon substantial change in the law or regulations adversely changing tax liability under this chapter; or, with permission of the director of revenue upon the showing of good cause for such action. After such a withdrawal or revocation with respect to an affiliated group, it may not file a Missouri consolidated income tax return for five years thereafter, except with the approval of the director of revenue, and subject to such terms and conditions as he may prescribe.
   3. (3) No corporation which is part of an affiliated group of corporations filing a Missouri consolidated income tax return shall be required to file a separate Missouri corporate income tax return for the taxable year.
   4. (4) For each taxable year an affiliated group of corporations filing a federal consolidated income tax return does not file a Missouri consolidated income tax return, for purposes of computing the Missouri income tax, the federal taxable income of each member of the affiliated group shall be determined as if a separate federal income tax return had been filed by each such member.
   5. (5) The director of revenue may prescribe such regulations not inconsistent with the provisions of this chapter as he may deem necessary in order that the tax liability of any affiliated group of corporations making a Missouri consolidated income tax return, and of each corporation in the group, before, during, and after the period of affiliation, may be returned, determined, computed, assessed, collected, and adjusted, in such manner as clearly to reflect the Missouri taxable income derived from sources within this state and in order to prevent avoidance of such tax liability.

(L. 1972 S.B. 549)

Effective 1-1-73

(1998) Director may revoke affiliated group status only when the consolidated returns do not clearly reflect the Missouri taxable income derived from sources within this state. Suburban Newspapers of Greater St. Louis, Inc. v. Director of Revenue, 975 S.W.2d 107 (Mo.banc).

(1998) The fifty percent threshold requirement of subdivision (1) of subsection 3 of this section is unconstitutional because it discriminates against interstate commerce. General Motors Corp. v. Director of Revenue, 981 S.W.2d 561 (Mo.banc).