Mo. Rev. Stat. § 143.123
143.123 Taxes on annuities, pensions and retirement allowances, subtraction per ...
143.123. Taxes on annuities, pensions and retirement allowances, subtraction per taxpayer, maximums per year or six-month period. — Any six thousand dollar subtraction provided by law for annuities, pensions, and retirement allowances in total per taxpayer, as hereafter provided by subsequent law, shall be implemented in a maximum amount of six thousand dollars per year, or three thousand dollars for a six-month period.
(L. 1989 H.B. 610 § 1) Effective 6-14-89