S.D. Codified Laws § 3-12C-1110
Reduction age defined for foundation members
For any foundation member, the term, reduction age, means the age at which the sum of the foundation member's age and credited service equals a number as follows:
(1) For Class A credited service, an age not less than fifty-five and at which the sum of the foundation member's age and credited service equals eighty-five;
(2) For Class B credited service as a justice, judge, or magistrate judge, an age not less than fifty-five and at which the sum of the foundation member's age and credited service equals eighty; and
(3) For Class B credited service other than as a justice, judge, or magistrate judge, an age not less than forty-five and at which the sum of the foundation member's age and credited service equals seventy-five.
Source: SL 2016, ch 32, § 29; SDCL § 3-12-89.7 ; SL 2019, ch 22, § 1.