South Dakota Income Tax Calculator

South Dakota Income Tax: Why Zero Has Been the Answer Since 1889

South Dakota has never levied a state individual income tax. Not for a year, not for an emergency, not as a temporary measure — not once since the territorial period or the 40th state’s founding in 1889. This is different from states like New Hampshire, which eliminated its last income tax in 2025 after 102 years, or Tennessee, which phased out its Hall Tax in 2021. South Dakota’s zero is original. The state built its fiscal model around property taxes, sales taxes, excise taxes, and gaming revenues from the beginning, and has never deviated from that model despite periodic political debates. The practical result for residents is straightforward: your wages, your retirement distributions, your investment income, your capital gains, and your Social Security benefits are all free of state income tax. The only income-based taxes you pay are federal.

The Constitutional Lock: Why South Dakota’s Income Tax Can’t Come Back Without Your Vote

What makes South Dakota uniquely different from other no-income-tax states is not just the absence of the tax — it is the structural protection around that absence. In 1996, South Dakota voters approved an amendment to the state constitution (Article XI, §14) that requires either a two-thirds supermajority vote of both chambers of the legislature or approval by voters through a public initiative before any new state tax can be created or any existing tax rate increased. This is not a simple legislative statute that can be repealed by a future majority — it is a constitutional provision that itself would require a supermajority or voter approval to change. When residents and businesses evaluate South Dakota’s long-term tax environment, this constitutional protection is the most important factor. A future governor or legislative majority cannot simply decide to add an income tax the way a regular bill passes. The threshold for change is deliberately high, and the 1996 voter adoption of that threshold was itself a clear signal of where South Dakota’s political consensus on taxation sits.

The 1981 Citibank Move — How South Dakota Became America’s Credit Card Capital

The decision that shaped South Dakota’s modern economy was made not by a tax authority but by a New York banker. In 1980, Citibank was losing money on its credit card operations because New York’s usury laws capped the interest rates it could charge — and with the Federal Reserve’s benchmark rate exceeding 20% in 1980, lending money at capped rates meant lending at a loss. Governor Bill Janklow, looking for a way to pull South Dakota out of an agricultural recession, reached out to Citibank directly. The deal was straightforward: South Dakota would remove its usury interest rate caps, and Citibank would relocate its credit card operations to Sioux Falls. The state legislature passed the change in 1981. Citibank moved. Within a few years, Wells Fargo, First Premier Bank, Capital One, and dozens of other financial institutions established major South Dakota operations. Today, Sioux Falls processes a significant share of the nation’s credit card transactions, and financial services represent one of South Dakota’s largest economic sectors — all built on a 1981 decision to remove a rate cap that no longer exists under federal preemption. The no-corporate-income-tax environment that made South Dakota attractive to banks in 1981 remains fully intact today.

$500 Billion in Trust Assets: South Dakota’s Other Financial Revolution

The credit card industry was South Dakota’s first financial services success story. The trust industry is its second — and arguably its more lasting legacy. South Dakota has built, over four decades of deliberate legislation, what many estate planning attorneys consider the most favorable trust jurisdiction in the United States, and one of the most favorable in the world. The key features: no rule against perpetuities (South Dakota trusts can last in perpetuity — effectively forever), no state income tax on trust income, no capital gains tax on trust assets, comprehensive privacy protections (trusts need not be registered with courts), and strong asset-protection provisions that make South Dakota trusts highly resistant to creditor claims. As a result, more than $500 billion in trust assets are estimated to be held in South Dakota — assets belonging not just to Americans but to wealthy families from Europe, Asia, and Latin America who have domiciled trusts in the Rushmore State for tax efficiency and legal protection. This trust industry has generated thousands of jobs in trust administration, banking, and legal services, and generates substantial revenue from bank franchise taxes that help South Dakota maintain its zero income tax approach for residents.

The Tradeoff: Sales Tax, Property Tax, and the Grocery Debate

South Dakota’s fiscal model requires revenue from somewhere, and the primary sources are sales tax and property tax. The state sales tax rate was 4.5% for many years; Governor Kristi Noem signed House Bill 1137 in 2023 reducing it to 4.2% effective July 1, 2023 — but that reduction carries a sunset clause that returns the rate to 4.5% on July 1, 2027, unless the legislature acts to extend it. Local municipalities add typically 1–2% in additional sales tax, bringing combined rates in Sioux Falls, Rapid City, and Aberdeen to approximately 6.2%. A distinctive and frequently debated feature of South Dakota’s sales tax is that it applies to groceries — unlike 37 other states that exempt food from sales tax. A 2022 ballot measure to remove the grocery tax failed, maintaining a provision that creates a meaningful burden for lower-income households who spend a larger share of income on food. Property taxes in South Dakota average approximately 1.02% effective rate — above the national average of 0.89%, and meaningfully higher than some neighboring states. For homeowners in Sioux Falls or Rapid City, where median home values have appreciated substantially since 2020, the property tax bill can be $3,000–$5,000 annually on a typical home. These two taxes — sales and property — are the deliberate revenue replacement for the income tax South Dakota never adopted. For high-income earners, the math strongly favors South Dakota regardless: the savings from zero income tax on a $200,000 salary versus neighboring Minnesota’s progressive rate (up to 9.85%) can exceed $15,000 annually, far outweighing the higher property and sales tax costs.

South Dakota for Remote Workers and Retirees: The 2025 Calculus

The rise of remote work has made South Dakota increasingly attractive to professionals who no longer need to live near their employer. A software engineer earning $150,000 from a San Francisco or Minneapolis company who relocates to Sioux Falls owes South Dakota $0 in state income tax — compared to Minnesota’s effective state rate of roughly 7–9% at that income level, a savings of $10,000–$13,500 per year. For retirees, the calculation is equally compelling: every dollar of Social Security, IRA distribution, pension income, dividend, and capital gain is free from South Dakota state income tax, with no thresholds, no phase-outs, and no forms to file. The only taxes retirees face in South Dakota are federal income tax (under standard IRS rules), property tax on their home (approximately 1% effective rate), and the 4.2% state sales tax on purchases. South Dakota also has no estate tax and no inheritance tax — meaning the transfer of accumulated wealth to heirs faces only federal estate tax, with no additional state levy. For families engaged in multi-generational wealth planning, this combination of zero income tax, zero estate tax, and premier trust laws makes South Dakota one of the most comprehensive tax-planning jurisdictions in the country.