South Dakota has no individual or corporate income tax, so there are no income-tax returns to file. The CPA focus is the sales and use tax, a contractor’s excise tax, and — for financial institutions only — a bank franchise tax that functions like an income tax.
South Dakota Tax Deadlines at a Glance (2026)
Filing | Applies To | Due Date |
|---|---|---|
Sales & Use Tax | Sellers | 20th of the following month |
Contractor’s Excise Tax | Construction contractors | 20th of the following month |
Bank Franchise Tax | Financial institutions | ~15 days after federal income-tax return |
Individual / Corporate income tax | N/A | None |
South Dakota’s sales and use tax rate is 4.2% (in effect through 2027), with municipal taxes of up to 2% on top. Filing frequency is assigned by the Department of Revenue — monthly, quarterly, or annually — and returns are due the 20th of the month following the reporting period (electronic payments by the 25th). A separate 2% contractor’s excise tax applies to construction work.
The Bank Franchise Tax
The one income-like tax in South Dakota is the bank franchise tax on financial institutions: 6% of net income, with a $200 minimum per location. The return is due within 15 days after the institution’s federal income-tax return is due. Because South Dakota has no general income tax, there is no pass-through entity tax.
CPA Action Steps
File sales and use tax by the 20th (4.2% state + up to 2% municipal)
Track the 2% contractor’s excise tax for construction clients
File the bank franchise tax (6% of net income) only for financial institutions
There is no income tax and no PTE tax
Verify current rates and dates against the South Dakota Department of Revenue (dor.sd.gov) before filing.