S.D. Codified Laws § 10-46-43
Each retailer required or authorized to collect taxes imposed by this chapter and each person using, storing or otherwise consuming in this state tangible personal property or any product transferred electronically purchased on or after July 1, 1939, shall keep such records, receipts, invoices, and other pertinent papers as the secretary of revenue shall require, in such form as the secretary of revenue shall require. The secretary of revenue and any of the secretary's duly authorized agents may examine the books, papers, records, and equipment of any person either selling tangible personal property or products transferred electronically or liable for the tax imposed by this chapter, and investigate the character of the business of any such person in order to verify the accuracy of any return made, or if the return was made by such person, to ascertain and determine the amount due under the provisions of this chapter. Any such books, papers, and records shall be made available within this state for such examination upon reasonable notice if the secretary of revenue deems it advisable and so orders.
SDCL 10-46-43