S.D. Codified Laws § 25-2-10
Current with legislation signed by the governor on or before 3/6/2024
Either husband or wife may enter into any engagement or transaction with the other, or with any other person, respecting property, which either might, if unmarried, subject, in transactions between themselves, to the general rules which control the actions of persons occupying confidential relations with each other, as prescribed by law.
SDCL 25-2-10