S.D. Codified Laws § 3-13-99 (2026)
An automatic enrollment unit other than the state may elect to automatically enroll the unit's permanent employees who are not contributing to the deferred compensation plan. The automatic enrollment unit may elect to commence automatic enrollment for the employees on the January or July immediately after the automatic enrollment unit's decision is delivered in writing to the system. The notice of the decision must be received no later than September fifteenth for a January start or March fifteenth for a July start.
Source: SL 2025, ch 27 , § 126.