MO Rev Stat § 143.391 (2021)
2021 Missouri Revised Statutes|Title X - Taxation and Revenue|Chapter 143 - Income Tax|Section 143.391 - Share of nonresident estate, trust, or beneficiary in income from Missouri sources.

Effective - 01 Jan 1973   143.391. Share of nonresident estate, trust, or beneficiary in income from Missouri sources. — 1. The share of a nonresident estate or trust under subdivision (1) of subsection 1 of section 143.381 and the share of a nonresident beneficiary of any estate or trust under subsection 1 of section 143.181 in estate or trust income, gain, loss, and deduction, from sources within Missouri shall be determined as follows:  (1) There shall be determined the items of income, gain, loss, deduction, and credit derived from sources within Missouri which enter into the definition of federal distributable net income of the estate or trust for the taxable year (including such items from another estate or trust of which the first estate or trust is a beneficiary). Such determination of source shall be made under regulations prescribed by the director of revenue in accordance with the applicable rules of section 143.181 as in the case of a nonresident individual.  (2) There shall be added or subtracted, as the case may be, the modifications described in sections 143.121 and 143.141, and there shall be subtracted the federal income tax deduction provided in section 143.171. These additions and subtractions shall only apply to the extent relating to items of income, gain, loss, and deduction derived from sources within Missouri, which enter into the definition of federal distributable net income (including such items from another estate or trust of which the first estate or trust is a beneficiary). No modification shall be made under this subdivision (2) which has the effect of duplicating an item already reflected in federal distributable net income.  (3) (a) The sum of the amounts determined under subdivisions (1) and (2) of subsection 1 of this section shall be allocated among the estate or trust and its beneficiaries (including, solely for the purpose of this allocation, resident and charitable beneficiaries) in proportion to their respective shares of the sum of federal distributable net income of the estate or trust and the amount paid or required to be paid to a charitable organization to the extent such amount is attributable to income for the current year.  (b) The amounts so allocated shall have the same character under this section as for federal income tax purposes. Where an item entering into the computation of such amounts is not characterized for federal income tax purposes, it shall have the same character as if realized directly from the source from which realized by the estate or trust, or incurred in the same manner as incurred by the estate or trust.  2. (1) If the estate or trust has no federal distributable net income for the taxable year, the share of each beneficiary (including, solely for the purpose of this allocation, resident beneficiaries) in the net amount, determined under subdivisions (1) and (2) of subsection 1 of this section, shall be in proportion to his share of the estate or trust income for such year, under the applicable law or the governing instrument, which is required to be distributed currently and any other amounts of such income distributed in such year. Any balance of such net amount shall be allocated to the estate or trust.  (2) The director of revenue may, by regulation, establish such other method or methods of determining the respective shares of the beneficiaries and of the estate or trust in its income derived from sources within Missouri and in the modifications related thereto as may be appropriate and equitable. Such method may be used by the fiduciary in his discretion whenever the allocation of such respective shares under subsection 1 or subdivision (1) of subsection 2 of this section would result in an inequity which is substantial both in amount and in relation to the total amount of the amount of the modifications referred to in subdivision (2) of subsection 1 of this section. ­­-------- (L. 1972 S.B. 549)  Effective 1-1-73