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South Dakota Self-Employment Tax Calculator 2025 — Federal SE Tax, No State Income Tax

See your self-employment tax in South Dakota: federal 15.3% (Social Security + Medicare) on your profit — South Dakota has no state income tax. Instant, in your browser.

Free South Dakota self-employment tax calculator for 2025. South Dakota has no individual income tax, so a 1099 contractor or sole proprietor owes only the federal SE tax: 12.4% Social Security up to the $176,100 wage base + 2.9% Medicare on 92.35% of net profit (the 15.3% combined rate), plus the 0.9% Additional Medicare surtax above the threshold. Shows the deductible half and a QBI note. Runs entirely in your browser; no data sent to any server. It runs free in your browser on Gera Tools, with nothing uploaded.

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Does South Dakota have a state self-employment or income tax?

No. South Dakota has no individual income tax, so self-employment profit is taxed only by the federal SE tax. The only tax this calculator computes on your business profit is the federal self-employment tax (Social Security + Medicare). You may still owe federal income tax, which is calculated separately.

South Dakota Self-Employment Tax Calculator 2025

If you are a freelancer, 1099 contractor, gig worker, or sole proprietor in South Dakota, you pay self-employment (SE) tax — your share of Social Security and Medicare, reported on Schedule SE. Because South Dakota has no individual income tax, the SE tax is the only tax you owe on your business profit at the federal-plus-state level for this calculation (federal income tax is still separate). South Dakota has no individual income tax, so self-employment profit is taxed only by the federal SE tax.

Enter your net profit below. The calculator applies the IRS net-earnings factor and the 2025 rates, shows the half you can deduct, and adds a Qualified Business Income (QBI) note.

How the 2025 federal SE tax works

  1. Net earnings = net profit × 92.35% (the 0.9235 Schedule SE factor). No SE tax is due if this is under $400.
  2. Social Security = 12.4% on net earnings up to the $176,100 2025 wage base.
  3. Medicare = 2.9% on all net earnings — no cap.
  4. Additional Medicare = 0.9% on combined wages above $200,000 (single) / $250,000 (married filing jointly).
  5. The base 12.4% + 2.9% = 15.3% combined rate is the headline figure. You may deduct one-half of the SE tax as an above-the-line adjustment on your federal return.

Worked example (South Dakota, $80,000 net profit, 2025): net earnings $73,880.00 → Social Security $9,161.12 + Medicare $2,142.52 = $11,303.64 SE tax, with $5,651.82 deductible. South Dakota state income tax on that profit: $0.

QBI deduction (separate from SE tax)

You may also qualify for the Qualified Business Income (QBI / §199A) deduction — up to 20% of your business profit — but it reduces your income tax, not your self-employment tax. For 2025 the full 20% applies without wage/property limits when taxable income (before the deduction) is at or below $197,300 (single) or $394,600 (married filing jointly).

Sources: federal rates — IRS Self-Employment Tax & Schedule SE (2025); $176,100 wage base — SSA Contribution and Benefit Base (2025); QBI — IRS Instructions for Form 8995 (2025). No-state-income-tax status — Tax Foundation, States With No Income Tax (2025). Verify with the South Dakota Department of Revenue. Estimate only, not tax advice.