How marginal tax brackets work
The single biggest tax misconception is that moving into a higher bracket taxes your whole income at that rate. It doesn't. The U.S. federal system is marginal: each bracket applies only to the dollars inside it. If the 22% bracket starts at $47,150 (single, 2025), a taxpayer earning $50,000 pays 22% only on the $2,850 above that threshold — not on the whole $50,000. Everything below is taxed at 10% and 12%, in the appropriate slices.
Federal brackets — the actual numbers
| Bracket | Taxable income | Tax on lower boundary |
|---|---|---|
| 10% | $0 – $11,925 | $0 |
| 12% | $11,925 – $48,475 | $1,192.50 |
| 22% | $48,475 – $103,350 | $5,578.50 |
| 24% | $103,350 – $197,300 | $17,651.00 |
| 32% | $197,300 – $250,525 | $40,199.00 |
| 35% | $250,525 – $626,350 | $57,231.00 |
| 37% | $626,350+ | $188,769.75 |
Worked example: $75,000 single filer
Gross wages $75,000, standard deduction $15,000 → taxable income $60,000. Tax owed: 10% on first $11,925 = $1,192.50; 12% on next $36,550 ($11,925 → $48,475) = $4,386.00; 22% on next $11,525 ($48,475 → $60,000) = $2,535.50. Total federal income tax = $8,114. Effective rate = 8,114 / 75,000 = 10.8%. Marginal rate is 22%. Add FICA (7.65%) and this person's federal-plus-payroll bite is about 18.5% before any state tax.
Marginal vs. effective tax rate
The marginal rate is the tax on your next dollar earned — the top bracket you land in. The effective rate is total tax divided by total income — always lower than the marginal rate because the earlier brackets tax at lower percentages. When people say 'I don't want a raise, it'll push me into a higher bracket,' they're conflating the two. A raise only ever increases take-home pay; the higher rate applies only to the incremental dollars.
FICA and other payroll taxes
Federal income tax is not the whole federal picture. Every W-2 worker pays FICA: Social Security at 6.2% on wages up to $176,100 (2025 cap) and Medicare at 1.45% on all wages, plus 0.9% Additional Medicare Tax on wages above $200,000. Self-employed workers pay both the employee and employer halves — 15.3% — but can deduct half on their income tax return. Most take-home pay estimators bake FICA in; if yours doesn't, subtract 7.65% before comparing offers.
Deductions vs. credits — the difference matters
- A deduction lowers taxable income. A $1,000 deduction saves you $220 if you're in the 22% bracket.
- A credit lowers tax directly, dollar for dollar. A $1,000 credit saves $1,000 regardless of bracket.
- Refundable credits (EITC, portions of the Child Tax Credit) can generate a refund even if you owe no tax.
- Above-the-line deductions (401(k), HSA, traditional IRA) reduce AGI before the standard/itemized decision.
What about state income tax?
This calculator handles federal only. Nine states — Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming — have no state income tax. Others range from a flat 3% (Pennsylvania) up to 13.3% top marginal (California). Combined federal-plus-state marginal rates for high earners in California or New York can exceed 50%. For a full take-home number, pair this tool with a state calculator or your state department of revenue's estimator.
How to use this income tax calculator
- Enter your annual gross wages before any deductions.
- Select your filing status (single, married filing jointly, head of household, married filing separately).
- Enter above-the-line deductions like 401(k), traditional IRA, or HSA contributions.
- Choose the standard deduction or enter itemized deductions if higher.
- Read federal income tax owed, effective and marginal rates, and estimated take-home pay.
Related calculators
Combine this with the salary calculator to convert an hourly or annual offer into a taxable base, the retirement calculator to see how a pre-tax 401(k) contribution lowers taxable income, the investment calculator for after-tax growth on taxable accounts, and the inflation calculator to keep bracket thresholds in perspective across years.