S.D. Codified Laws § 24-15A-8.1
Upon the recommendation of the supervising agent, the board may grant a partial early final discharge for a parolee or person serving a suspended sentence under supervision of the board if the board is satisfied that a partial early final discharge would be in the best interests of society and the inmate. A partial early final discharge is a reduction of the sentence term in an amount less than the amount to discharge the inmate from supervision. A partial early final discharge shall impact the inmate's sentence discharge date pursuant to §§ 24-15A-6 and 24-5-1. There is no entitlement to a partial early final discharge. Neither this section nor its application may be the basis for establishing a constitutionally protected liberty, property, or due process interest in any inmate.
SDCL 24-15A-8.1