Marginal Tax Rate Calculator: 2025 US Federal Tax Bracket
Your marginal tax rate is the rate that applies to your next dollar of income, and it is the most practically useful tax rate for financial decision-making. When you earn a bonus, take on freelance work, sell an investment, or consider a deduction, your marginal rate tells you the exact tax cost or saving on that additional income or deduction. This calculator looks up your marginal tax bracket under the 2025 US federal income tax schedule and shows you the bracket range, the effective rate (your average tax across all income), total tax owed, and after-tax income. Enter your taxable income (after deductions and exemptions, as it appears on your return) and your filing status, then see your marginal bracket and a full breakdown of how your bill is computed. The 2025 brackets were published by the IRS in Revenue Procedure 2024-40 and include inflation adjustments. If you are near a bracket boundary, the breakdown table shows exactly how much income falls in each bracket, helping you understand whether shifting income or taking an additional deduction would move you to a lower marginal rate.
Formulas
For each bracket: tax in bracket = min(income, bracket top) - bracket bottom (floored at 0) x rate
Total tax = sum of tax in each bracket
Marginal rate = rate of the highest bracket your income reaches
Effective rate = total tax / taxable income x 100
After-tax income = taxable income - total tax
Brackets: 2025 IRS figures (IRS Rev. Proc. 2024-40), inflation-adjusted.
2025 bracket thresholds (single): 10% up to $11,925; 12% up to $48,475; 22% up to $103,350; 24% up to $197,300; 32% up to $250,525; 35% up to $626,350; 37% above $626,350.
2025 standard deductions (not applied here; enter post-deduction taxable income): Single: $15,000. Married filing jointly: $30,000. Head of household: $22,500.
How to use this calculator
- Enter your taxable income after subtracting deductions from adjusted gross income. This matches the taxable income line on your Form 1040.
- Select your filing status.
- Read your marginal rate and the bracket range from the primary outputs.
- Use the effective rate to compare your overall tax burden with prior years or with others.
- Review the bracket table to see which slices of your income are taxed at each rate. If your income is near a bracket boundary, the table shows how close you are and what a deduction or additional income would cost or save.
Frequently asked questions
What does "marginal tax rate" mean?
The marginal tax rate is the rate applied to the last (marginal) dollar of your taxable income. In a progressive system, income is taxed in layers: the first portion at the lowest rate, the next portion at the next rate, and so on. Your marginal rate is the highest rate bracket your income reaches, applied only to the income within that bracket.
Why does knowing my marginal rate matter?
Your marginal rate tells you the tax cost of earning an additional dollar of income or the tax saving from an additional dollar of deduction. For example, if your marginal rate is 22%, a $1,000 deduction saves you $220 in federal tax. A raise of $1,000 costs $220 in federal tax. It is the rate relevant for financial decisions at the margin.
How is marginal rate different from effective rate?
The effective rate is total tax divided by total income. It is the average rate across all your income. The marginal rate applies only to the top layer. For example, someone with $75,000 of taxable income (single) is in the 22% marginal bracket but pays an effective rate of about 13%, because most of their income is taxed at 10% and 12%.
Do investment gains change my marginal rate?
Ordinary income and long-term capital gains are taxed separately. Long-term capital gains have their own rate schedule (0%, 15%, or 20% depending on income). However, capital gains are stacked on top of ordinary income to determine which ordinary income brackets apply. A large capital gain can push ordinary income into a higher bracket.
Can contributing to a 401k lower my marginal rate?
Yes, if the deduction is large enough to drop your taxable income below a bracket threshold. For example, if your taxable income before a 401k contribution puts you in the 22% bracket, and a pre-tax contribution reduces it below $48,475 (single), some of your income shifts from 22% to 12%, saving the difference.
Official sources
- IRS Revenue Procedure 2024-40 (2025 tax brackets): irs.gov/pub/irs-drop/rp-24-40.pdf.
- IRS: Tax Withholding Estimator: irs.gov/newsroom/tax-withholding-estimator.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.