South Dakota Sales Tax Rate & Rules (2026)

South Dakota levies a 4.2% state sales and use tax. Most municipalities add up to 2% (Roslyn levies 3%), so combined rates run to about 6.2%, or 7.2% in Roslyn. South Dakota is the state behind the landmark Wayfair decision that established economic nexus nationwide.

To find the combined rate for a specific address, use our US sales tax calculator.

South Dakota economic nexus applies once your gross sales into the state exceed $100,000 in the current or prior calendar year. The 200-transaction threshold was removed effective 1 July 2023, so the dollar amount is the only economic trigger. Physical presence creates nexus immediately.

South Dakota requires a marketplace provider to obtain a sales tax licence and remit sales tax on facilitated sales into the state when it is itself a remote seller, facilitates sales for at least one qualifying marketplace seller, or its combined marketplace-seller sales exceed the threshold. That threshold is more than $100,000 in gross sales into South Dakota in the previous or current calendar year, the same gross-revenue test used for South Dakota's remote-seller criteria. A provider that meets the threshold is not required to register and begin remitting until the first day of the first month that begins at least 30 days after meeting it, a timing rule codified by 2025 Senate Bill 43. A separate statutory provision bars retroactive enforcement against a marketplace provider for sales made before 1 March 2019.[7]

South Dakota assigns monthly, quarterly, or annual filing based on tax volume. Returns are due the 20th of the month following the reporting period, regardless of filing frequency; electronic payments are due the 25th. For the portal, return, and step-by-step, see our guide to filing South Dakota sales tax online.

South Dakota taxes groceries at the full state and local rate — there is no grocery exemption. Prescription drugs are exempt. SaaS is taxable in South Dakota as a service or use of software.

South Dakota buyers give the seller a completed exemption certificate, including the multistate Streamlined Certificate of Exemption, to buy inventory for resale [4]. The certificate requires a tax ID number and stays valid while the information remains accurate [4].

For the official form, multistate certificate rules and expiry, see the South Dakota resale certificate guide.

Late filing or payment carries a penalty of 10% of the tax due (or $10, whichever is greater), plus interest from the due date. Our South Dakota filing guide lists late filing penalties, interest, and what to do if you missed a return.

You request a hearing by mailing a written request within 60 days of the date a Certificate of Assessment was mailed [5]. Miss the 60-day window and the assessment becomes final [5].

• [1] South Dakota DOR — 2023 Legislative Updates (4.2% rate, nexus)

• [2] South Dakota DOR — 2026 Sales and Use Tax Guide (groceries, clothing taxable)

• [3] South Dakota DOR — Products Transferred Electronically (SaaS and digital taxable)

• [4] South Dakota DOR — Exemption Certificate

• [5] South Dakota DOR — Audit and Appeals (60-day hearing request)

• [6] South Dakota DOR — Online Tax Licence Application

• [7] South Dakota Department of Revenue — Marketplace Provider Bulletin

Verified July 2026 against South Dakota Department of Revenue published guidance.

• Sales Tax on Digital Products South Dakota: What Businesses Need to Know
• Sales Tax Exemptions in South Dakota