Mo. Rev. Stat. § 476.580
On September 1, 1976, the Missouri state employees' retirement system shall administer the retirement benefits of all judges provided for in this chapter and, unless otherwise provided by law, effective July 1, 1998, the commissioner of administration, the state treasurer and the executive director of the Missouri state employees' retirement system shall perform the same duties in regard to the retirement system established pursuant to the provisions of this chapter that are prescribed for such officers in sections 104.436 and 104.438, in regard to the Missouri state employees' retirement system. Funds so certified and transferred for the retirement system established pursuant to the provisions of this chapter shall be deposited in a separate account of the Missouri state employees' retirement system and shall be disbursed only for the purposes of the retirement system established pursuant to the provisions of this chapter. Until July 1, 1998, retirement benefits provided for in this chapter shall be paid monthly out of the general revenue of the state of Missouri. The system shall calculate the annuity provided to a judge, as defined in section 476.515, based on the law in effect at the time the judge's employment was terminated.
§ 476.580, RSMo