S.D. Codified Laws § 55-16-11
A qualified disposition that is made by means of a disposition by a transferor who is a trustee is deemed to have been made as of the time, whether before, on, or after July 1, 2005, the property that is the subject of the qualified disposition was originally transferred to the transferor, or any predecessor trustee, making the qualified disposition in a form that meets the requirements of subdivisions 55-16-2(2) and (3). Further, the provisions of this section apply to determine the date the transfer is deemed to have been made, notwithstanding that the original transfer was to a trust originally within or outside of the jurisdiction of South Dakota.
If property transferred to a spendthrift trust is conveyed to the settlor or to a beneficiary for the purpose of obtaining a loan secured by a mortgage or deed of trust on the property and then reconveyed to the trust within one hundred eighty days of recording the mortgage or deed of trust, for purposes of subdivision 55-16-10(1), the transfer is disregarded and the reconveyance relates back to the date the property was originally transferred to the trust. The mortgage or deed of trust on the property is enforceable against the trust.
SDCL 55-16-11