U.S. State Income Tax Analysis
How the U.S. state income tax landscape is structured, no-tax versus flat versus graduated systems, and how much your tax bill can swing from one state to the next at the same income.
Three ways states tax income
Across the 51 U.S. jurisdictions (the 50 states plus the District of Columbia), income tax falls into three structures:
- 9 no-income-tax jurisdictions (18% of the total) levy no broad-based tax on wage income: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming. Residents there typically pay more in sales or property taxes instead.
- 16 flat-rate jurisdictions (31% of the total) apply a single rate to all taxable income, regardless of how much you earn.
- 26 graduated jurisdictions (51% of the total) tax higher income at higher marginal rates, much like the federal system, topping out at California's 13.3% top rate.
State tax burden spread at $100K
At the same $100,000 single-filer salary, the state income tax owed varies sharply by location:
- Lowest: Alaska - $0 in state income tax
- Highest: Oregon - $8,180 in state income tax
- Spread: $8,180 between the two extremes
That spread is entirely the state layer. Federal income tax and FICA payroll tax (Social Security 6.2% up to the annual wage base, Medicare 1.45% with no cap) are the same in every state, so the difference above is the full extent of state-level discretion in income tax burden.
How federal and state stack up
The federal income tax has seven brackets for 2026-10%, 12%, 22%, 24%, 32%, 35%, and 37% - with the top 37% rate reaching only the highest slice of income (well into the six figures for a single filer). State rates sit on top of that. In a no-income-tax state, your total marginal tax on the top dollar is the federal rate alone; in a high-tax graduated state, the combined federal-plus-state marginal rate is meaningfully higher.
For a side-by-side comparison of all states at common income levels, see our effective tax burden by state at $100K and top states by income tax burden research pages, or run your own salary through the federal + state tax calculator.
Every figure on PlainSalary is computed directly from official IRS, state Department of Revenue, and SSA tax data, no number is typed in by an editor. This page draws directly on IRS and state Department of Revenue source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.