S.D. Codified Laws § 55-17-3 (2026)
Spouses may classify all or any of their property as special spousal property by transferring property to a South Dakota special spousal trust established pursuant to this chapter, and by expressly declaring in the trust that the property is community property. Unless there is a specific provision in the governing instrument stating otherwise, each spouse's respective interest in the special spousal property is fifty percent.
Source: SL 2016, ch 231 , § 31; SL 2018, ch 275 , § 29.