SDCL § 55-17-3: Classification of property--Interest of each spouse.

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.