S.D. Codified Laws § 3-13-56.9 (2026)
A political subdivision may not maintain a deferred compensation plan as its principal retirement plan unless the deferred compensation plan was established prior to 1974. A deferred compensation plan established pursuant to chapter 3-13 may only be supplemental or secondary to the political subdivision's primary plan.
Source: SL 2025, ch 27 , § 85.