What is the Marginal Tax Rate?
The marginal tax rate is the percentage of federal income tax you pay on the next dollar of income, the rate of your top bracket. In a progressive system, the marginal rate is always greater than or equal to the effective (average) tax rate because only the last slice of taxable income is taxed at the top rate, while earlier dollars are taxed at lower bracket rates.
Detailed definition
The marginal tax rate is the percentage of federal income tax owed on the next dollar of taxable income. It is the slope of the tax schedule at your current income level. The US uses a graduated marginal-bracket system: as taxable income rises, it crosses statutory thresholds and the rate paid on each successive slice climbs. The first bracket is 10 percent, the top bracket is 37 percent, and there are five rates in between (12, 22, 24, 32, 35 percent) for 2026.
The widespread misconception is that crossing into a higher bracket re-taxes every dollar. That is not how it works. If your taxable income is one dollar above the $48,475 single threshold for the 22 percent bracket in 2026, only that one extra dollar is taxed at 22 percent. The $11,925 below the 12 percent threshold is still taxed at 10 percent, and the $36,550 between the two is still taxed at 12 percent. Take-home pay after taxes always increases with every additional dollar earned in a marginal system.
Marginal rate is the correct input for any "next dollar" decision: whether to make a pre-tax 401(k) contribution (deductible at your marginal), whether to do a Roth conversion in a low-income year (taxed at your current marginal, withdrawn tax-free later), whether to harvest capital losses (worth more at a higher marginal), or whether to delay a year-end bonus into January. The effective (average) rate is the wrong number for those decisions; it is a backward-looking summary, not a marginal cost.
Formula
Marginal tax rate = rate of the bracket your last taxable dollar lands in Federal tax on bracket = (Income in bracket) x bracket rate Total federal tax = sum of (income in each bracket) x (each bracket rate) All-in marginal = Federal marginal + state marginal + 3.8% NIIT (if applicable) + 0.9% Add'l Medicare (if applicable)
- Taxable income = AGI minus standard or itemized deductions minus QBI deduction. The brackets apply to this number, not gross income.
- Bracket lookup = find the row in the 2026 IRS table that contains your taxable income; the rate in that row is your marginal rate.
- NIIT = 3.8 percent on investment income above $200,000 single / $250,000 MFJ MAGI.
- Additional Medicare = 0.9 percent on wages and self-employment income above $200,000 single / $250,000 MFJ.
2026 US marginal tax brackets
The IRS publishes these in Rev. Proc. 2025-32. They apply to taxable income for tax year 2026 (filed in early 2027).
| Rate | Single | Married filing jointly | Head of household |
|---|---|---|---|
| 10% | $0 to $11,925 | $0 to $23,850 | $0 to $17,000 |
| 12% | $11,925 to $48,475 | $23,850 to $96,950 | $17,000 to $64,850 |
| 22% | $48,475 to $103,350 | $96,950 to $206,700 | $64,850 to $103,350 |
| 24% | $103,350 to $197,300 | $206,700 to $394,600 | $103,350 to $197,300 |
| 32% | $197,300 to $250,525 | $394,600 to $501,050 | $197,300 to $250,500 |
| 35% | $250,525 to $626,350 | $501,050 to $751,600 | $250,500 to $626,350 |
| 37% | above $626,350 | above $751,600 | above $626,350 |
Worked example
A single filer in 2026 has $90,000 of taxable income (after the standard deduction). She is deciding whether to take a $5,000 year-end bonus now or defer it to 2027 when she plans to take an unpaid sabbatical.
- Find current bracket: $90,000 falls in the 22 percent bracket ($48,475 to $103,350 single).
- Marginal rate on the bonus: 22 percent. The $5,000 bonus would generate $1,100 in federal income tax.
- Project sabbatical year: $0 wages plus $5,000 bonus equals $5,000 taxable income (after deduction, likely $0 since the $15,000 standard deduction wipes it out).
- Marginal rate next year: effectively 0 percent if total income is under the standard deduction; otherwise 10 percent in the lowest bracket.
- Tax saving from deferral: $1,100 versus roughly $0 = $1,100 saved by delaying the bonus.
Common pitfalls
- Believing a raise can leave you worse off. Only the dollars above the new bracket threshold are taxed at the higher rate. Take-home always rises with gross.
- Quoting marginal when you should quote effective. "My tax rate is 22 percent" usually means the marginal bracket. Actual share of income paid in federal tax is far lower for most filers.
- Forgetting the standard deduction. The brackets apply to taxable income (gross minus the deduction), not to wages. A single filer earning $60,000 has $45,000 taxable, well inside the 12 percent bracket, not the 22 percent.
- Ignoring phase-outs. Effective marginal rates can briefly spike (sometimes above the statutory 37 percent) inside Saver's Credit, Child Tax Credit, IRA deduction, and ACA premium-tax-credit phase-out ranges.
- Treating cap gains as ordinary. Long-term capital gains and qualified dividends have their own 0/15/20 percent brackets that stack on top of ordinary income. They do not push ordinary income into a higher ordinary bracket.
- Forgetting state and FICA. A 24 percent federal marginal rate easily becomes 38 percent all-in once California state (9.3 to 13.3 percent) and 7.65 percent FICA are layered on.
Related terms
Related calculators on 3Tej
Find your exact marginal and effective rate for any income and filing status:
Frequently asked questions
What are the 2026 federal marginal tax brackets?
For tax year 2026 the single brackets are 10 percent up to $11,925, 12 percent up to $48,475, 22 percent up to $103,350, 24 percent up to $197,300, 32 percent up to $250,525, 35 percent up to $626,350, and 37 percent above. Married filing jointly thresholds are roughly double the single thresholds at every bracket, except the 35 percent and 37 percent brackets which compress. Per IRS Rev. Proc. 2025-32.
Will a raise push me into a higher bracket and cost me money?
No. Only the dollars above the next bracket threshold get taxed at the higher rate, not the entire income. A raise from $48,000 to $50,000 moves a small slice into the 22 percent bracket, but the first $11,925 is still taxed at 10 percent and the next slice at 12 percent. You always net more take-home pay after a raise. The myth that a raise can leave you worse off is mathematically false in a marginal-bracket system.
What is the highest US marginal tax rate?
The top statutory federal marginal rate is 37 percent for 2026, kicking in above $626,350 single or $751,600 married filing jointly. Stacking the 3.8 percent Net Investment Income Tax, the 0.9 percent Additional Medicare Tax, and a top state rate (13.3 percent California) can lift the all-in top marginal rate above 50 percent for a high earner in a high-tax state.
How is my marginal rate used in tax planning?
The marginal rate is the right input for decisions about the next dollar: traditional vs Roth 401(k) (deduct now at your marginal, withdraw later at a likely lower marginal), accelerating or deferring income across years, harvesting capital losses (worth more dollar-for-dollar at a high marginal), bunching charitable deductions in one tax year, and timing equity-comp exercises.
How does the marginal rate change between filing statuses?
Married filing jointly thresholds are double the single thresholds for the lower five brackets, then compress at 35 and 37 percent. Married filing separately uses half the MFJ thresholds, which is usually punitive. Head of household uses thresholds between single and MFJ. The right filing status can shift you down a bracket and save several thousand dollars.
Does my marginal rate include state tax?
Federal marginal rate is the 10 to 37 percent ladder. Add your state marginal rate (0 percent in TX/FL/WA/NV/TN/SD/WY/AK, up to 13.3 percent in California, 10.9 percent in New York City stacking state plus city) for an all-in marginal rate. A New Yorker in the 32 percent federal bracket actually faces roughly 43 percent on the next dollar after state and city.
Sources and further reading
- IRS Rev. Proc. 2025-32 (October 2025), the official 2026 inflation adjustments, including all marginal bracket thresholds quoted on this page.
- IRS (2024) Publication 17, Your Federal Income Tax, the consumer-facing IRS guide to bracket math.
- Tax Foundation (2025) 2026 Federal Income Tax Brackets and Standard Deduction, with side-by-side bracket tables.
- Tax Policy Center (2024) The Numbers: Briefing Book - Marginal and Average Tax Rates, why marginal and effective diverge.
- Congressional Research Service (2024) Statutory, Average, and Effective Marginal Tax Rates in the Federal Income Tax (R44787).