S.D. Codified Laws § 38-33-10

Within ninety days following the assessment, any seller subject to the assessment provided in §§ 38-33-1 to 38-33-12, inclusive, may apply to the commission for a refund of the assessment. The refund application shall be accompanied by a copy of the record of the assessment on the sale. The commission shall refund the amount of the assessment collected within sixty days of receiving a valid refund application.