South Dakota Self-Employment Tax Calculator (2026)
Federal self-employment tax, federal income tax and how much to set aside for each estimated payment on 1099 income earned in South Dakota, which has no personal income tax. Business, sales, local and entity-level taxes are outside the calculator and are described below.
Federal 2026 data checked against the official publications, last on 2026-09-05 Runs in your browser — nothing you type is sent anywhere, not even when you reload or share the link No sign-up Methodology and data status
- Total tax
- $14,803
- Effective rate
- 20.6%
- Set aside per quarter
- $3,701
- After-tax income
- $57,197
| Breakdown | |
|---|---|
| Net profit (income − expenses) | $72,000 |
| Self-employment tax | $10,173 |
| Social Security (12.4%) | $8,245 |
| Medicare (2.9%) | $1,928 |
| Federal income tax | $4,630 |
| Adjusted gross income | $66,913 |
| Standard deduction | −$16,100 |
| Qualified business income deduction (20%) | −$10,163 |
| Taxable income · marginal rate 12.0% | $40,651 |
| South Dakota income tax | None |
| Total federal + state | $14,803 |
Amounts to set aside, not bills: federal $3,701 for each Form 1040-ES installment (Apr 15, Jun 15, Sep 15, Jan 15). For the safe-harbor amount and payments you have already made, use the quarterly calculator with these inputs.
South Dakota and self-employment income
South Dakota has no personal or corporate income tax. Freelancers pay federal self-employment and income tax only.
South Dakota at a glance, for a one-person business
| Stands in for an income tax | Sales tax charged on services as broadly as on goods |
|---|---|
| Where it starts | The first dollar, for anyone with a physical presence in the state |
| Are freelance services taxable? | Yes — design, writing, consulting and photography are all taxable |
| State licence | Sales tax licence, free, but required before the first taxable sale |
| What a sole proprietor files | Sales tax returns on the schedule the department assigns, including nil returns |
None of this is income tax, so none of it is in the calculator above. The same five rows for all 9 states without an income tax sets South Dakota against the rest.
What a South Dakota freelancer may still owe
- South Dakota is one of the few states that taxes services as broadly as goods. Design, writing, consulting and photography sold to a South Dakota client are generally taxable at 4.2% state rate plus 1% to 2% municipal tax.
- If you have a physical presence in South Dakota you must hold a sales tax licence from the first dollar of taxable sales. The $100,000 threshold that gets quoted applies only to sellers with no presence in the state.
- The licence itself is free, but returns are due on the schedule the department assigns, even for a month with no sales.
- There is no state income tax to estimate, so the only quarterly payments are the federal ones.
South Dakota business obligations last read against the agency's own pages on 2026-09-09: South Dakota sales and use tax, Sales and use tax guide, Licence requirements. These are outside the calculator; it computes income tax only.
A copywriter in Sioux Falls
This is the case that surprises people. A copywriter with $90,000 of receipts pays the same federal tax as anywhere and no state income tax — and then South Dakota taxes the copywriting itself, at 4.2% state plus a municipal rate of up to 2%. On $90,000 that is roughly $5,580 at the combined 6.2%, more than the income tax would be in several states that levy one. The tax is on the sale, so it is normally added to the invoice rather than absorbed, but the licence, the returns and the liability are the freelancer's. The $100,000 figure often quoted as a threshold applies to sellers with no presence in the state; if you live there, it is the first dollar.
How the federal part is worked out
Net profit is 1099 income less business expenses (Schedule C). Self-employment tax is 15.3% of 92.35% of that profit — 12.4% Social Security up to $184,500 of combined wages and earnings, 2.9% Medicare on all of it. Half of that tax, the $16,100 standard deduction ($32,200 joint) and the 20% qualified business income deduction come off before the 2026 brackets are applied; the child tax credit and the earned income credit then reduce what is left, and the refundable parts can offset self-employment tax. The methodology page sets out the full sequence and every rule the calculator leaves out.
Quarterly estimated tax deadlines (2026)
If you expect to owe $1,000 or more of federal tax for the year, the IRS expects four estimated payments (Form 1040-ES). Because South Dakota has no income tax, there is no separate state estimate to make.
The 2026 dates are April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027. The federal amount is split into four equal Form 1040-ES installments after any withholding you entered; paying 100% of last year's tax instead (110% above $150,000 of prior-year AGI) also avoids the penalty. The quarterly calculator works that out and subtracts what you have already paid, and the guide to the due dates explains the rule.
Common questions
Do I pay self-employment tax if South Dakota has no income tax?
Yes. Self-employment tax is a federal tax that funds Social Security and Medicare. It applies in every state regardless of state income tax.
Is half of self-employment tax really deductible?
Yes, for federal tax. The employer-equivalent half is an adjustment to income on Schedule 1, which lowers your AGI and therefore your federal income tax. It does not reduce the self-employment tax itself.
Does an LLC change these numbers?
For federal income tax and self-employment tax, a single-member LLC taxed as a sole proprietorship follows exactly the calculation shown here. State and local obligations can still differ: an LLC may be a taxable entity for a state's franchise, gross-receipts or excise tax, and may owe registration or licence fees a sole proprietor does not — South Dakota's are listed above. Electing S-corporation status changes the federal arithmetic too (salary plus distributions) and is outside this tool's scope.
What if I moved to South Dakota during the year?
Income earned while you were a resident of another state is taxable there under that state's rules. This calculator assumes all income was earned as a South Dakota resident.
Data sources and status
Federal figures for 2026: verified · last verified 2026-09-05 · the revenue procedures and forms they were read from, with every other data set
South Dakota Department of Revenue · How figures are checked · Corrections log
Other states
Comparing the states that skip the income tax altogether? What the 9 states with no individual income tax charge instead puts the gross-receipts taxes, sales tax treatment of services and licence fees side by side.
Paying as you go? The quarterly estimated tax calculator applies the federal safe harbor and subtracts what you have already paid.