Mo. Rev. Stat. § 474.564
Applicability of act, when.
474.564. Applicability of act, when. — The provisions of sections 474.540 to 474.564 shall apply to any will of a decedent who dies on or after August 28, 2025, and to each written estate planning document, as that term is defined in section 474.560 , signed or remotely witnessed on or after August 28, 2025.
(L. 2025 H.B. 754)