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South Dakota Small Business Tax Guide
What South Dakota's Department of Revenue, its codified laws and the IRS say about sales, municipal and federal taxes, as reading material and not tax advice.
Disclaimer: This page is educational content only. Tax laws change, and your situation may differ. It is not legal, tax, or financial advice. Consult a qualified professional licensed in South Dakota before making filing or planning decisions.
Tax landscape for small businesses
Each South Dakota figure below comes word for word from the state Department of Revenue or South Dakota Codified Law, and each federal figure from the IRS, with its date beside it.
On income, the South Dakota Department of Revenue's individual taxes page (South Dakota, checked October 31, 2026) states that South Dakota "does not impose a state income tax", and its business taxes page (checked October 31, 2026) states "South Dakota does not impose a corporate income tax."
On sales, the Department of Revenue's sales and use tax page (South Dakota, checked October 31, 2026) states "The state sales and use tax rate is 4.2%." South Dakota Codified Law 10-45-2 (checked October 31, 2026) shows a version marked "Effective July 1, 2027" that reads "a tax of four and one-half percent upon the gross receipts of all sales of tangible personal property". Cities add their own tax: the Department of Revenue's municipal tax page (checked October 31, 2026) states "The rate of tax is generally between 1% to 2%."
On licensing, the sales and use tax page (South Dakota Department of Revenue, checked October 31, 2026) states "Any business with a physical presence in South Dakota is required to be licensed for sales tax collection." For sellers without one, it states "If the business does not have a physical presence but has more than $100,000 in gross sales into South Dakota in the previous or current calendar year, the business is required to license their business and remit applicable sales tax."
Worked example (sample figures; state rate from the Department of Revenue, South Dakota, checked October 31, 2026): $500.00 of taxable goods at 4.2% comes to $500.00 × 4.2% = $21.00 in state sales tax, for $521.00 in total. The municipal tax page states "The rate of tax is generally between 1% to 2%.", so add the city's rate where it applies.
Tax overview
Each row lists a tax area and its notes. Confirm current figures with your state's tax agency or the IRS.
| Tax type | Rate or basis | Notes |
|---|---|---|
| Individual income tax | "does not impose a state income tax" | The South Dakota Department of Revenue's individual taxes page (South Dakota, checked October 31, 2026). |
| Corporate income tax | "does not impose a corporate income tax" | The South Dakota Department of Revenue's business taxes page (South Dakota, checked October 31, 2026): "South Dakota does not impose a corporate income tax." |
| State sales and use tax | "4.2%" | The South Dakota Department of Revenue's sales and use tax page (South Dakota, checked October 31, 2026): "The state sales and use tax rate is 4.2%." |
| Municipal sales tax | "generally between 1% to 2%" | The South Dakota Department of Revenue's municipal tax page (South Dakota, checked October 31, 2026): "The 1% municipal gross receipts tax (MGRT) is in addition to the municipal sales tax." |
| Contractor's excise tax | "a rate of 2%" | The South Dakota Department of Revenue's contractor's excise tax page (South Dakota, checked October 31, 2026): "The excise tax imposed on the gross receipts for construction projects is at a rate of 2%." |
| Federal self-employment tax | "15.3%" | IRS, In the US (federal), self-employment tax page last reviewed or updated October 30, 2026: "The self-employment tax rate is 15.3%." |
Filing requirements
This list isn't a complete checklist for your business.
Sales tax license
The South Dakota Department of Revenue's sales and use tax page (South Dakota, checked October 31, 2026) states "Any business with a physical presence in South Dakota is required to be licensed for sales tax collection." For remote sellers, the threshold it lists is "Your business's gross revenue from sales into South Dakota exceeded $100,000".
Exempt sales and exemption certificates
The Department of Revenue's sales and use tax page (South Dakota, checked October 31, 2026) states "There are four reasons that products and services would be exempt from South Dakota sales tax." In short, they are an exempt buyer, an item the law exempts, a buyer's claim for exemption, and delivery to a point outside the state. On certificates, it states "A seller does not have to collect sales tax when a purchaser gives a seller a completed exemption certificate at the time of sale." The certificate can be used to claim exemption for "Products or services intended to be resold", among other uses.
Electronic returns and payments
The South Dakota Department of Revenue's business taxes page (South Dakota, checked October 31, 2026) states "Returns filed electronically need to be filed by the 20th of each month following the reporting period, regardless of the amount due. Payments are due on the 25th of each month."
Paper returns
The same South Dakota Department of Revenue page (South Dakota, checked October 31, 2026) states "Returns filed on a paper form must be filed and paid by the 20th of each month following the reporting period, regardless of the amount due."
Federal estimated tax
IRS, In the US (federal), estimated taxes page last reviewed or updated September 25, 2026: "Individuals, including sole proprietors, partners, and S corporation shareholders, generally have to make estimated tax payments if they expect to owe tax of $1,000 or more when their return is filed."
Deductions and write-offs
Confirm with your state how it treats each item.
- SE tax in adjusted gross income: IRS, In the US (federal), self-employment tax page last reviewed or updated October 30, 2026, states "You can deduct the employer-equivalent portion of your self-employment tax in figuring your adjusted gross income."
- Your record system: IRS, In the US (federal), recordkeeping page last reviewed or updated May 1, 2026, states "You may choose any recordkeeping system suited to your business that clearly shows your income and expenses."
- Ask a tax professional which federal deductions apply to your business.
Practical tips
- Check whether your city adds a municipal tax. The South Dakota Department of Revenue's municipal tax page (checked October 31, 2026) lists each municipality that imposes one.
- Note the monthly due date. The Department of Revenue's business taxes page (South Dakota, checked October 31, 2026) states returns filed electronically "need to be filed by the 20th of each month following the reporting period, regardless of the amount due".
- Put the sales tax line on every invoice. Billed's mobile app page (checked October 31, 2026) says you can "Add line items, your logo, and tax, then send by email or share a link before you leave the site."
- Export the year for your accountant. Billed's expense tracking page (checked October 31, 2026) says "Reports can be filtered by date range and exported for your accountant, bookkeeper or tax software."
- Before filing, set these figures beside the current pages of the Department of Revenue and the IRS; a tax professional can say how they apply to you.
Frequently asked questions
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At a glance
| Topic | Department of Revenue, Codified Law or IRS wording |
|---|---|
| Income tax | Department of Revenue: "does not impose a state income tax" (South Dakota, checked October 31, 2026) |
| State sales and use tax | Department of Revenue: "The state sales and use tax rate is 4.2%." (South Dakota, checked October 31, 2026) |
| Rate from July 1, 2027 | South Dakota Codified Law 10-45-2: "a tax of four and one-half percent upon the gross receipts of all sales of tangible personal property" (South Dakota, checked October 31, 2026) |
| Municipal tax | Department of Revenue: "The rate of tax is generally between 1% to 2%." (South Dakota, checked October 31, 2026) |
| Remote seller threshold | Department of Revenue: "more than $100,000 in gross sales into South Dakota in the previous or current calendar year" (South Dakota, checked October 31, 2026) |
| Federal SE tax | IRS: "The self-employment tax rate is 15.3%." (In the US (federal), last reviewed or updated October 30, 2026) |
When this isn't for you
Aimed at sole proprietors and small companies that sell in South Dakota. Bank franchise, tourism, motor fuel and property taxes aren't covered here; for those, contact a tax professional or the Department of Revenue.