S.D. Codified Laws § 55-15-12
This chapter shall be construed as pertaining to the administration of a trust and shall be available to any trust that is administered in South Dakota under South Dakota law unless (i) the governing instrument reflects an intention that the current beneficiary or beneficiaries are to receive an amount other than a reasonable current return from the trust, ii) the trust is a trust described in I.R.C. section 170(f)(2)(B), 6664(d), 1361(d), 2702(a)(3), or 2702(b), (iii) one or more persons to whom the trustee could distribute income have a power of withdrawal over the trust that is not subject to an ascertainable standard under I.R.C. section 2041 or 2514 or that can be exercised to discharge a duty of support he or she possesses, or (iv) the governing instrument expressly prohibits use of this chapter by specific reference to the chapter. A provision in the governing instrument that "The provisions of this chapter, or any corresponding provision of future law, may not be used in the administration of this trust" or similar words reflecting such intent are sufficient to preclude use of this chapter.
SDCL 55-15-12