SDCL § 10-23-27: Unpaid and subsequent taxes to be paid before assignment of tax certificate purchased by county.

All taxes subsequently accruing against the real property, or that were unpaid at the time of the tax certificate sale and a lien on the real property but not included in the bid, is considered as a subsequent tax. Before the county can make an assignment of the interest in and rights to the real property, or before an assignment of the tax certificate of the sale is made, all taxes shall be paid in full, including the amount for which the tax certificate was bid off.