S.D. Codified Laws § 3-12C-905
Deductions of member's primary social security from benefits
Seventy-five percent of a member's primary social security, without regard to any improvements, shall be deducted from the benefits provided in subdivisions 3-12C-901(1) and (2).
Source: SL 1974, ch 35, § 51; SL 1977, ch 28, § 10; SL 1986, ch 37, § 6; SL 1994, ch 35, § 1; SDCL § 3-12-96 ; SL 2019, ch 22, § 1.