Mo. Rev. Stat. § 474.564
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)