Federal income tax in the United States is progressive: rates rise in steps as your income climbs, moving through seven brackets that run from 10% to 37% for 2026. State income tax is a different story. Some states copy the federal graduated approach, fifteen use a single flat rate for everyone, and nine states don’t tax wage and salary income at all. So the honest answer to whether income tax is flat or progressive is both, depending on which tax and which state you’re asking about.
How the Federal Progressive System Works
The federal schedule is set by 26 U.S. Code ยง 1, which stacks rates in layers rather than picking one rate for your whole income.1Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed Your first dollars of taxable income are taxed at 10% no matter how much you earn overall. Only the income that spills into the next layer gets taxed at the next rate, and so on up the ladder.
This is the source of the most common misunderstanding about brackets. Moving into a higher bracket does not raise the rate on your existing income. If a raise pushes one dollar of your taxable income into the 22% bracket, that one dollar is taxed at 22%. Every dollar below the threshold stays at 10% or 12%. A raise never leaves you with less take-home pay.
Because of that layering, your effective rate (the share of your total income that actually goes to the IRS) is always lower than your top marginal bracket. IRS data for tax year 2022 shows the gap. Taxpayers in the bottom half of earners paid an average effective federal rate of about 3.7%. The top 25% to 10% paid roughly 10.7%. Even the top 1%, whose top dollars hit the 37% bracket, paid about 26.1% on their total income.
2026 Federal Tax Brackets
The IRS set the 2026 brackets under Revenue Procedure 2025-32.2Internal Revenue Service. Revenue Procedure 2025-32 For single filers:
- 10% on taxable income up to $12,400
- 12% on $12,401 to $50,400
- 22% on $50,401 to $105,700
- 24% on $105,701 to $201,775
- 32% on $201,776 to $256,225
- 35% on $256,226 to $640,600
- 37% on income above $640,600
Married couples filing jointly get roughly doubled thresholds. Their 10% bracket covers the first $24,800, the 12% bracket runs to $100,800, and the top 37% rate doesn’t apply until income passes $768,701.2Internal Revenue Service. Revenue Procedure 2025-32 Thresholds are adjusted annually for inflation.3Internal Revenue Service. Federal Income Tax Rates and Brackets For 2026, the One Big Beautiful Bill Act delivered a 4% inflation adjustment for the bottom two brackets and 2.3% for the higher ones.
One more piece matters before the bracket math starts: the standard deduction. Brackets apply to taxable income, not gross income. For 2026 the standard deduction is $16,100 for single filers, $32,200 for married filing jointly, and $24,150 for head of household.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments from the One, Big, Beautiful Bill A single filer with $65,000 in gross income subtracts the $16,100 deduction and lands at $48,900 of taxable income, most of which falls into the 12% bracket.
State Income Taxes: Three Different Answers
States design their own income tax systems, and they’ve landed in very different places. About 26 states and the District of Columbia use graduated brackets modeled on the federal approach, with top marginal rates ranging from around 2.5% to over 13%. Fifteen states use a flat rate that applies the same percentage to every resident’s taxable income. Nine states impose no personal income tax on wages and salaries at all, though one of those nine still taxes certain investment income above a high threshold.
Flat-tax states trade progressivity for simplicity. Your taxable income gets multiplied by a single number and you’re done, with no marginal-versus-effective distinction to work through. Critics of flat rates argue they place a disproportionate share of the burden on lower-income households, since the same percentage takes a bigger bite when more of your income goes to necessities. Supporters point to the simplicity and to the fact that taxpayers at every income level pay the same rate on every dollar.
States without an income tax cover their budgets through sales taxes, property taxes, and fees on natural resource extraction. Moving to one of these states does not automatically mean paying less overall. Some make up the difference with higher sales or property taxes that can reach or exceed what a middle-income resident would have paid in income tax elsewhere. The actual comparison depends on your income, spending, and whether you own property.
There’s a third layer sitting on top of state tax in about 16 states: local income taxes charged by cities, counties, or school districts. More than 5,000 individual jurisdictions levy them. Rates are usually modest, but in some metro areas the combined state and local rate lands well above the headline state number, which matters when you’re comparing take-home pay across cities.
The Flat Federal Taxes on Your Paycheck
Federal income tax is progressive, but it isn’t the only federal tax coming out of your wages, and the others don’t behave the same way. Social Security tax is 6.2% on wages up to $184,500 in 2026, with your employer matching that amount.5Social Security Administration. Contribution and Benefit Base Every dollar above the cap is exempt. Medicare tax runs 1.45% on all wages with no cap, plus an extra 0.9% on earnings above $200,000 for individuals.
The Social Security piece is actually regressive in practice. A worker earning $80,000 pays 6.2% on every dollar of wages. Someone earning $500,000 pays 6.2% on the first $184,500 and nothing on the rest, which drops the effective Social Security rate below 2.3%. Combined with the progressive income tax, payroll taxes are big enough to be the largest federal tax bill many middle-income households actually pay. A worker earning $50,000 might owe around $2,500 in federal income tax after deductions but $3,825 in payroll taxes on the employee side alone.
Capital Gains Runs on Its Own Progressive Schedule
Not every kind of income flows through the seven ordinary brackets. Profits from selling investments held longer than a year are taxed under a separate schedule with three tiers and lower rates. For 2026, single filers pay 0% on long-term capital gains if taxable income stays below $49,450, 15% on gains between $49,451 and $545,500, and 20% above that.2Internal Revenue Service. Revenue Procedure 2025-32 Married couples filing jointly get roughly doubled thresholds, with the 15% rate starting at $98,901 and the 20% rate at $613,701.
The structure is technically progressive because it has tiers, but the rates sit far below the ordinary income brackets at every level. Someone earning $200,000 in salary hits a 24% marginal rate on top dollars, while someone realizing $200,000 in long-term capital gains could pay 15%. Short-term gains on investments held a year or less don’t get this treatment and flow through the ordinary brackets. High earners may also owe an additional 3.8% net investment income tax on top of the capital gains rate.
What This Means for Your Return
If you want a shorthand answer: your federal income tax bill is calculated progressively, most of your state tax bill either is or isn’t depending on where you live, and the payroll taxes on your paycheck are effectively flat up to the Social Security wage cap and regressive above it. The rate on your last dollar earned is almost never the rate you actually pay on your income overall, and the difference is the point of a progressive system.