Mo. Rev. Stat. » Chapter 143
Missouri Revised Statutes

Mo. Rev. Stat. § 143.431 (2026)

Missouri taxable income and tax

✓ current as of May 2026
Find cases: SyfertCases citing this section MO-REVrevisor.mo.gov Justiaon Justia CornellLII Search CasesGoogle Scholar

  143.431.  Missouri taxable income and tax. — 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 to 4 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.  There shall be added to or subtracted from federal taxable income the modifications to adjusted gross income provided in section 143.121, with the exception of subdivision (5) of subsection 2 of 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.  (1)  If an affiliated group of corporations files a consolidated income tax return for the taxable year for federal income tax purposes, 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.  All transactions between affiliated members of the affiliated group shall be eliminated on the Missouri consolidated income tax return.

  (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filed, an election made by an affiliated group of corporations to file a Missouri consolidated income tax return may be withdrawn or revoked only upon substantial change in the law or regulations adversely changing tax liability under this chapter, or with permission of the director of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)  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)  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)  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.

  4.  If a net operating loss deduction is allowed for the taxable year, there shall be added to federal taxable income the amount of the net operating loss modification for each loss year as to which a portion of the net operating loss deduction is attributable.  As used in this subsection, the following terms mean:

  (1)  "Loss year", the taxable year in which there occurs a federal net operating loss that is carried back or carried forward in whole or in part to another taxable year;

  (2)  "Net addition modification", for any taxable year, the amount by which the sum of all required additions to federal taxable income provided in this chapter, except for the net operating loss modification, exceeds the combined sum of the amount of all required subtractions from federal taxable income provided in this chapter;

  (3)  "Net operating loss deduction", a net operating loss deduction allowed for federal income tax purposes under Section 172 of the Internal Revenue Code of 1986, as amended, or a net operating loss deduction allowed for Missouri income tax purposes under paragraph (d)* of subsection 2 of section 143.121, but not including any net operating loss deduction that is allowed for federal income tax purposes but disallowed for Missouri income tax purposes under paragraph (d)* of subsection 2 of section 143.121;

  (4)  "Net operating loss modification", an amount equal to the lesser of the amount of the net operating loss deduction attributable to that loss year or the amount by which the total net operating loss in the loss year is less than the sum of:

  (a)  The net addition modification for that loss year; and

  (b)  The cumulative net operating loss deductions attributable to that loss year allowed for the taxable year and all prior taxable years.

  5.  For all tax years ending on or after July 1, 2002, federal taxable income may be a positive or negative amount.  Subsection 4 of this section shall be effective for all tax years with a net operating loss deduction attributable to a loss year ending on or after July 1, 2002, and the net operating loss modification shall only apply to loss years ending on or after July 1, 2002.

­­--------

(L. 1972 S.B. 549, A.L. 2004 S.B. 1394, A.L. 2007 H.B. 444, et al., A.L. 2018 S.B. 884)

*Paragraph (d) does not exist.  The language for this reference appears to be contained in subdivision (4) of subsection 2 of section 143.121.

(2002) Payments between corporate taxpayers and related companies resulting from exclusive licensing agreements and patents executed outside state did not constitute Missouri source income.  Acme Royalty Company v. Director of Revenue, 96 S.W.3d 72 (Mo.banc).

Notes of Decisions
Cited in 14 cases, 1981–2013 · leading case: Farmers' & Laborers' Co-Operative Ins. Ass'n v. Dir. of Revenue, 742 S.W.2d 141 (Mo. 1987).
Sort: Relevance Newest Treatment
Farmers' & Laborers' Co-Operative Ins. Ass'n v. Dir. of Revenue, 742 S.W.2d 141 (Mo. 1987). · cites it 19× “Section 143.431, RSMo 1978, 3 identifies Missouri taxable income as federal taxable income derived from sources within Missouri.”
Mid-Am. Television Co. v. State Tax Comm'n, 652 S.W.2d 674 (Mo. 1983). · cites it 19× “Appellants further contend respondent's method for determining the allowable federal income tax deduction and § 143.431 constitute a denial of equal protection and *680 violate that part of art.”
Brown Grp., Inc. v. Admin. Hearing Comm'n, 649 S.W.2d 874 (Mo. 1983). · cites it 12× “Petitioner raises four issues on appeal: (1) Whether federal taxable income under § 143.431, RSMo 1978 [1] may be less than zero; (2) whether additional assessments may be made by subordinates of the Director of Revenue; (3) whether royalties paid by a foreign corporation to…”
Dow Chem. Co. v. Dir. of Revenue, State, 834 S.W.2d 742 (Mo. 1992). · cites it 26× “The Director contends that the order of the Commission misconstrues § 143.431 and misapplies our decision in Dow I.”
Goldberg v. State Tax Comm'n, 639 S.W.2d 796 (Mo. 1982). · cites it 4× “451, RSMo 1978, apportionment is the "source of income," citing sections 143.431 and 143.451.1, RSMo 1978.”
Gott v. Dir. of Revenue, 5 S.W.3d 155 (Mo. 1999). · cites it 4× “These cases held that S-corporations are not subject to apportionment under section 143.431. 14 However, these cases do not address calculation of enterprise zone benefits for S-corporations.”
Lloyd v. Dir. of Revenue, 851 S.W.2d 519 (Mo. 1993). · cites it 6× “Section 143.431 provides the entire formula for calculating Missouri taxable income of a corporation.”
Eilian v. Dir. of Revenue, 402 S.W.3d 566 (Mo. 2013). · cites it 10× “Eilian’s second argument to avoid the holdings in Brown is that Brown was abrograted by a subsequent legislative amendment to section 143.431. Even if the holding in Brown extends to individuals (and section 143.”
King v. Procter & Gamble Distrib. Co., 671 S.W.2d 784 (Mo. 1984). · cites it 3× “Section 143.431, RSMo 1978, defines Missouri taxable income of a corporation as its federal taxable income modified by, inter alia, certain itemized deductions provided in § 143.”
Williams Companies, Inc. v. Dir. of Revenue, 799 S.W.2d 602 (Mo. 1990). · cites it 2× “§§ 1501, 1504 (1990), whereas a combined return is based on the unitary nature of the affiliated group. To the extent that these concepts differ, 2 appellants’ reading of § 32.”
All Star Amusement, Inc. v. Dir. of Revenue, 873 S.W.2d 843 (Mo. 1994). · cites it 2× “2d 1079 (1991), the Court held that “the Compact was not intended to authorize an alternative tax base” from that specified in § 143.431, RSMo 1986. Rejecting the appellants’ argument to the contrary, the Court stated: However, in Goldberg v.”
A. P. Green Refractories Co. v. State Comm'n of Missouri, 621 S.W.2d 340 (Mo. Ct. App. 1981). “040 [repealed 1972], and for year 1973 was governed by §§ 143.431 and 143.451 [effective 1973], .”
Show all 14 citing cases →
— Mo. Rev. Stat. § 143.431(1) — 2 cases
Mid-Am. Television Co. v. State Tax Comm'n, 652 S.W.2d 674 (Mo. 1983). “Appellants further contend respondent's method for determining the allowable federal income tax deduction and § 143.431 constitute a denial of equal protection and *680 violate that part of art.”
Brown Grp., Inc. v. Admin. Hearing Comm'n, 649 S.W.2d 874 (Mo. 1983). “Petitioner raises four issues on appeal: (1) Whether federal taxable income under § 143.431, RSMo 1978 [1] may be less than zero; (2) whether additional assessments may be made by subordinates of the Director of Revenue; (3) whether royalties paid by a foreign corporation to…”
— Mo. Rev. Stat. § 143.431(3)(1) — 1 case
Mid-Am. Television Co. v. State Tax Comm'n, 652 S.W.2d 674 (Mo. 1983). “Appellants further contend respondent's method for determining the allowable federal income tax deduction and § 143.431 constitute a denial of equal protection and *680 violate that part of art.”
— Mo. Rev. Stat. § 143.431(3)(4) — 1 case
Mid-Am. Television Co. v. State Tax Comm'n, 652 S.W.2d 674 (Mo. 1983). “Appellants further contend respondent's method for determining the allowable federal income tax deduction and § 143.431 constitute a denial of equal protection and *680 violate that part of art.”
Annotations are extracted automatically from the opinions in the Syfert caselaw corpus and ranked by authority, recency, and treatment. Dots show Syfertize treatment of the citing case itself.