S.D. Codified Laws § 10-46B-1.6
Any person who holds a license issued pursuant to this chapter or who is a person whose receipts are subject to the tax imposed by this chapter shall, except as otherwise provided in this section, file a return, and pay any tax due, to the Department of Revenue on or before the twentieth day of the month following each monthly period. The return shall be filed on forms prescribed and furnished by the department.
If the person remits the tax by electronic transfer to the state, the person shall file the return by electronic means on or before the twentieth day of the month following each period and remit the tax on or before the twenty-fifth day of the month following each period.
The secretary may require or allow a person to file a return, and pay any tax due, on a basis other than monthly. The return and remittance is due the twentieth day of the month following the reporting period or at a time otherwise determined by the secretary.
The secretary may grant an extension of not more than five days for filing a return and remittance.
Unless an extension is granted, penalty or interest under § 10-59-6 shall be paid if a return or remittance is not made on time.
SDCL 10-46B-1.6