A graduated income tax charges higher rates on higher slices of your income, so not every dollar you earn is taxed the same way. The federal system uses seven rates for 2026, running from 10% on the lowest portion of taxable income up to 37% on income above $640,600 for single filers.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The idea is that people who earn more can afford to contribute a larger share, so the tax code layers increasingly higher percentages onto increasingly higher chunks of earnings.
How the Layered Math Works
The most common misunderstanding is that moving into a higher bracket means your entire income gets taxed at that rate. It doesn’t. Each bracket only applies to the dollars that fall inside it. The technical term is a marginal rate, meaning the rate on the next dollar earned, not on every dollar earned.
Take a single filer with $80,000 in gross income for 2026. After subtracting the $16,100 standard deduction, taxable income drops to $63,900. The first $12,400 is taxed at 10%, producing $1,240. The next $38,000 (from $12,401 to $50,400) is taxed at 12%, producing $4,560. The final $13,500 (from $50,401 to $63,900) is taxed at 22%, producing $2,970. Total federal tax: $8,770.2Internal Revenue Service. Rev. Proc. 2025-32
That $8,770 works out to roughly 11% of the original $80,000. The filer’s marginal rate is 22%, but their real burden is far less. This layered math is why a small raise never leaves you worse off after taxes. Earning one more dollar might push that dollar into a higher bracket, but it can’t retroactively increase the rate on the dollars below it.
Marginal Rate vs. Effective Rate
Your marginal rate is the bracket your last dollar of income falls into. Your effective rate is the actual percentage of your total income that goes to taxes after all brackets are applied. The single filer above has a 22% marginal rate and an effective rate near 11%.
Both numbers are useful, but for different questions. The marginal rate matters when you’re deciding whether to take on extra income, because each additional dollar earned is taxed at that rate. The effective rate matters for budgeting, because it tells you what the government actually took from your total earnings. You can calculate your own effective rate by dividing total tax on your return (Form 1040, line 24) by taxable income (line 15).
Deductions Come Before the Brackets
Before your income enters the bracket system, you subtract either the standard deduction or your total itemized deductions, whichever is larger. Most filers take the standard deduction because it requires no receipts or record-keeping. For 2026, the amounts are $16,100 for single filers and those married filing separately, $32,200 for married couples filing jointly, and $24,150 for head of household.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
Subtracting the deduction reduces the amount of income subject to tax, which effectively wipes out the lowest bracket for many filers and pushes the remaining income into lower brackets than it would otherwise occupy.3Internal Revenue Service. Topic No. 551, Standard Deduction A married couple filing jointly with $60,000 in income, for example, subtracts $32,200 and only runs $27,800 through the brackets. That entire $27,800 stays inside the first two brackets and never touches the 22% rate.
2026 Federal Income Tax Brackets
The federal government imposes graduated rates under 26 U.S.C. § 1, which establishes separate rate tables for each filing status.4Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed The IRS publishes updated thresholds each year through a revenue procedure. The 2026 figures reflect inflation adjustments and amendments from the One, Big, Beautiful Bill Act, signed into law on July 4, 2025.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
Single Filers
- 10% up to $12,400
- 12% from $12,401 to $50,400
- 22% from $50,401 to $105,700
- 24% from $105,701 to $201,775
- 32% from $201,776 to $256,225
- 35% from $256,226 to $640,600
- 37% over $640,600
Married Filing Jointly
- 10% up to $24,800
- 12% from $24,801 to $100,800
- 22% from $100,801 to $211,400
- 24% from $211,401 to $403,550
- 32% from $403,551 to $512,450
- 35% from $512,451 to $768,700
- 37% over $768,700
Head of Household and Married Filing Separately have their own thresholds. Head of Household brackets start at $17,700 for the 10% rate and top out above $640,600 at 37%. Married Filing Separately brackets mirror the single filer thresholds in the lower tiers but diverge at the top, with the 37% rate kicking in above $384,350.2Internal Revenue Service. Rev. Proc. 2025-32
How Filing Status Shifts the Math
Your filing status decides which bracket table applies to your taxable income. The four statuses are Single, Married Filing Jointly, Married Filing Separately, and Head of Household.5Internal Revenue Service. Federal Income Tax Rates and Brackets The brackets for married couples filing jointly are roughly double the single brackets through the 32% tier, so two people with similar incomes often pay about the same total tax whether they file jointly or as two singles.
That symmetry breaks down at higher incomes. When one spouse earns significantly more than the other, the couple often benefits from a marriage bonus because the higher earner’s income spreads across the joint return’s wider brackets. When both spouses earn roughly the same high income, the combined total can push more dollars into higher brackets than each person would hit individually, creating a marriage penalty. The effect is baked into the bracket math and is worth modeling before choosing Married Filing Separately over a joint return.
Head of Household status is available only to unmarried filers who pay more than half the cost of keeping up a home for a qualifying dependent. Its brackets fall between single and joint thresholds, offering wider low-rate tiers than single but narrower ones than joint.2Internal Revenue Service. Rev. Proc. 2025-32
What Income Runs Through the Brackets
Federal law defines gross income broadly: compensation for services, business income, interest, rents, royalties, dividends, pensions, and annuities all count.6Office of the Law Revision Counsel. 26 USC 61 – Gross Income Defined In practice, the income types most people encounter fall into a few groups.
Wages, salaries, tips, and commissions are the most familiar. Your employer withholds estimated taxes from each paycheck based on what you put on Form W-4, which is why your take-home pay already reflects a rough approximation of your graduated tax burden. Interest from bank accounts and ordinary dividends from stock holdings also flow through the graduated brackets and are taxed at the same rates as your paycheck.
Withdrawals from traditional retirement accounts like 401(k)s and traditional IRAs are another major category. Because contributions were tax-deferred going in, the money is taxed as ordinary income when it comes out. Every distribution lands in your graduated brackets alongside your other income. Required minimum distributions after age 73 work the same way, and a large enough distribution can push you into a higher bracket for that year.
Long-term capital gains and qualified dividends are the notable exception. They face their own separate rate structure with three tiers: 0%, 15%, and 20%. The thresholds are tied to your taxable income, but the rates themselves are lower than the ordinary brackets. For 2026, a single filer pays 0% on long-term capital gains up to $49,450 in taxable income and doesn’t reach the 20% rate until income exceeds $545,500. Short-term capital gains on assets held a year or less get no special treatment and are taxed at ordinary graduated rates.
Inflation Adjustments and Bracket Creep
Congress recognized that inflation could quietly push people into higher brackets without any real gain in purchasing power. If the thresholds stayed frozen while wages rose with inflation, everyone would drift into higher rates over time. This is called bracket creep.
To prevent it, 26 U.S.C. § 1(f) requires the IRS to adjust bracket thresholds annually using the Chained Consumer Price Index for All Urban Consumers, known as the C-CPI-U.4Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed The chained index accounts for consumers substituting cheaper goods when prices rise, which grows slightly slower than the traditional CPI. Each fall, the IRS publishes the following year’s adjusted thresholds through a revenue procedure. The standard deduction, AMT exemption amounts, and certain other provisions receive the same annual inflation treatment.
State Income Taxes Sit on Top
The federal government isn’t the only entity using this system. Many states impose their own graduated income taxes with separate rate structures. A handful use a flat income tax instead, charging one rate regardless of income. Eight states impose no individual income tax at all: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, and Wyoming. Washington taxes capital gains for high earners but otherwise has no personal income tax.7The White House. The Economic Impact of State Income Tax Elimination
If you live in a state with graduated income taxes, you’re navigating two separate bracket systems on the same income. A dollar that hits the 22% federal bracket and a 5% state bracket costs you 27 cents in combined income tax. State thresholds and rates vary widely, and some states adjust for inflation while others don’t, making bracket creep a larger risk at the state level.
When the AMT Overrides the Regular Brackets
The Alternative Minimum Tax exists as a backstop to the graduated system. It ensures that high-income taxpayers who use certain deductions and exclusions still pay a minimum amount of tax. The AMT recalculates your bill by starting with a broader definition of income, removing some deductions allowed under the regular rules, and applying a separate set of rates. If the AMT calculation produces a higher figure than your regular tax, you owe the difference.8Internal Revenue Service. Topic No. 556, Alternative Minimum Tax
For 2026, the AMT exemption protects the first $90,100 of alternative minimum taxable income for single filers and $140,200 for married couples filing jointly. Above those amounts, a flat 26% or 28% AMT rate applies. Most moderate-income taxpayers never trigger the AMT, but it’s worth checking if you claim large deductions for state and local taxes or exercise incentive stock options.