S.D. Codified Laws § 24-15A-6
The department must establish the sentence discharge date for each inmate based on the total sentence length, minus court ordered jail time credit. The total sentence length is the sum of imprisonment time and any suspended time. In the case of an entirely suspended state incarceration sentence under the supervision of the Department of Corrections and the Board of Pardons and Paroles pursuant to §§ 22-6-11, 23A-27-18.4, and 23A-27-19, the total sentence length is the term of imprisonment that has been suspended. Each inmate is under the jurisdiction of the department, either incarcerated or under parole release or a combination, for the entire term of the inmate's total sentence length unless the board grants an early final discharge pursuant to § 24-15A-8, a partial early final discharge pursuant to § 24-15A-8.1, the court modifies the sentence, the inmate receives earned discharge credits pursuant to § 24-15A-50 or 24-15A-50.1, the inmate receives a compliant discharge pursuant to § 16-22-29, or the sentence is commuted.
SDCL 24-15A-6