S.D. Codified Laws § 10-47B-34

Any supplier, out-of-state supplier, ethanol producer, or ethanol broker who properly remits tax under this chapter shall be allowed to retain an amount not to exceed two and one-fourth percent of the tax required to be paid on each gallon of fuel to this state. The amount to be retained is to help off-set the administrative expenses of timely reporting and payment of tax.