Mo. Rev. Stat. § 461.081: Nonprobate transfer laws to be effective when — prior transfers to be valid.

1. Sections 461.003 to 461.081 shall apply to beneficiary designations for nonprobate transfers made on and after August 28, 1989. Sections 461.003 to 461.081 shall apply to all nonprobate transfers occurring on and after January 1, 1990.

2. Any provision for a nonprobate transfer of money, benefits or property at death as now permitted in sections 461.003 to 461.081, purported to have been made before August 28, 1989, is validated notwithstanding that there was no specific statutory authority for making the nonprobate transfer in that manner at the time provision for the nonprobate transfer was made.