Mo. Rev. Stat. § 169.572: Dissolution of marriage, court not to divide retirement benefits or Social Security benefits.

1. No court shall divide or set aside any federal old-age, survivors or disability insurance benefit provided to any party pursuant to the federal Social Security Act, 42 U.S.C. Section 200 et seq., in any proceeding for dissolution of marriage.

2. Subsequent to August 28, 1991, a court of competent jurisdiction may divide the pension, annuity, benefits, rights, and retirement allowance provided pursuant to this chapter between the parties to any action for dissolution of marriage, to the same extent and in the same manner the court may divide any federal old-age, survivors or disability insurance benefit of the parties provided pursuant to the federal Social Security Act.