S.D. Codified Laws § 10-46-66
All auction sales and consignment sales of tangible personal property, any product transferred electronically, and services are sales at retail. The auction clerk shall file the return and remit the tax imposed by this chapter on the gross receipts from each auction after applying the deductions provided by § 10-45-92. However, the auctioneer is responsible for the payment of the tax imposed by this chapter if the auction clerk is an employee of the auctioneer or if the auction clerk does not have a permit as required by this chapter. In addition to any other information required to be kept by this chapter, each auction clerk shall keep records that identify the owner of the property sold at auction and the auctioneer who conducts the sale of such property.
SDCL 10-46-66