S.D. Codified Laws § 21-42-10
Any defendant to an action may make redemption of the lands from tax sales by paying the total amount of delinquent taxes, penalties and interest thereon at the Category D rate of interest as established in § 54-3-16, which shall have been paid by the plaintiff or which is due the county, if the county is plaintiff, together with costs of the action. Upon payment, a certificate of redemption shall be issued by the county treasurer of the county to the defendant and the action shall be dismissed. If a defendant desires to redeem from a tax sale and pay all subsequent taxes and costs upon any lot, piece, or parcel of real estate, the county treasurer shall permit redemption and payment in all cases where tax deeds have not been issued prior to July 1, 1941. If the real estate has been assessed together with other real estate, then the county treasurer shall compute and apportion the tax that should have been assessed against the real estate sought to be redeemed as if the property had been separately assessed. In cases which have undivided interests in real property so assessed as shown of record, the county treasurer shall compute and apportion the tax according to the interests sought to be redeemed. Any personal property taxes which are a lien upon the real estate shall be computed and apportioned on the same percentage basis as the tax assessed against the real estate is apportioned.
SDCL 21-42-10