How South Dakota Income Tax Works
South Dakota has no state income tax on wages. Your only income tax obligation is federal — there's no South Dakota return required for wage income, and your taxable income at the state level is effectively zero.
For most South Dakota residents, the 2026 federal standard deduction ($16,100 single, $32,200 married filing jointly) is applied first; only income above that gets taxed at federal rates of 10% to 37%. Use the calculator above to see how your specific salary maps to brackets.
South Dakota has no income tax, no corporate income tax, and no estate tax — making it a popular state for high-net-worth trust planning.
Finance (Sioux Falls is a major credit-card processing hub), agriculture, and tourism.
What South Dakota taxes instead
South Dakota combines a modest sales tax with a financial-services industry that other states effectively subsidise.
- Sales tax. A statewide sales tax plus municipal add-ons is the primary revenue source. South Dakota taxes groceries, which many states exempt, broadening the base rather than raising the rate.
- Financial services. South Dakota removed its interest-rate cap in 1980, prompting major credit-card operations to relocate there. Bank franchise taxes on that industry contribute revenue that residents of other states generate through their card balances.
- No corporate income tax. South Dakota levies neither a personal nor a corporate income tax, which is a deliberate draw for business relocation and part of why the overall tax burden ranks among the lowest nationally.
In practical terms, South Dakota's average combined state and local sales tax runs about 6.11% — see the South Dakota sales tax calculator for city-level rates. The useful comparison when weighing a move is total burden across income, sales, and property tax, not income tax alone.
How South Dakota Income Tax Compares to Neighboring States
Total income tax (federal + state) on a $100,000 annual salary in 2026, single filer using the standard deduction:
| State | State Tax | Total Income Tax | vs. South Dakota |
|---|---|---|---|
| South Dakota (here) | $0 | $13,170 | — |
| North Dakota | $712 | $13,882 | +$712 |
| Minnesota | $5,311 | $18,481 | +$5,311 |
| Iowa | $3,800 | $16,970 | +$3,800 |
| Nebraska | $3,846 | $17,016 | +$3,846 |
| Wyoming | $0 | $13,170 | $0 |
A negative "vs." figure means that state collects less total income tax than South Dakota. Federal portion is identical across states; only state tax varies.
Frequently Asked Questions
What is the South Dakota state income tax rate for 2026?
South Dakota has no state income tax on wages — the rate is 0% across all income levels. Only federal income tax applies, with brackets ranging from 10% to 37% depending on your taxable income.
How much income tax will I pay in South Dakota on a $100,000 salary?
For a single filer earning $100,000 in South Dakota in 2026, expect approximately $13,170 in federal income tax — for a total income tax of about $13,170, an effective rate of 13.2%. This excludes FICA (Social Security and Medicare), which adds roughly 7.65% on top.
What is the difference between effective and marginal tax rate?
Your marginal rate is the rate applied to your last dollar of taxable income — the bracket your top dollar lands in. Your effective rate is your total income tax divided by your total income — the average rate across everything you earned. Effective is always lower than marginal, because the lower brackets cover the first portions of your income at lower rates.
Does South Dakota tax retirement income, Social Security, or capital gains?
Federal rules: long-term capital gains use preferential rates (0%, 15%, 20%), and Social Security is taxable federally if your combined income exceeds certain thresholds. South Dakota has no state income tax, so retirement income, Social Security, and capital gains are not taxed at the state level either.
How is this South Dakota income tax estimate calculated?
We apply the 2026 federal IRS tax tables (10%–37% across seven brackets) to your taxable income (gross income minus the standard deduction). The calculator handles wages, self-employment income (with SE tax and the deductible half), and other income; you can also switch to itemized deductions. Tax credits, AMT, and preferential capital gains rates are not modeled — this is an estimate of ordinary income tax only.
For the preferential federal rates on long-term gains, see the Capital Gains Tax Calculator. For the federal brackets, standard deduction, and Social Security wage base that sit underneath this state calculation, see 2026 Tax Calculators.