Marginal vs Effective Tax Rate Calculator United States
This marginal vs effective tax rate calculator applies the 2026 IRS brackets for your filing status and shows why your average rate is below your top bracket.
What it does
The Marginal vs Effective Tax Rate Calculator shows the difference between your marginal rate — the rate on your next dollar of taxable income — and your effective rate, your total federal income tax divided by taxable income, using the 2026 federal brackets for your filing status.
Data sources & parameters
The figures below drive this calculator. We keep them aligned with the latest official guidance, and each result recalculates automatically whenever a value changes.
| Parameter | Value | Source | Last updated |
|---|---|---|---|
| Federal brackets, single | Rate schedule | irs.gov | Effective 2026-01-01 |
| Federal brackets, married joint | Rate schedule | irs.gov | Effective 2026-01-01 |
| Federal brackets, married separate | Rate schedule | irs.gov | Effective 2026-01-01 |
| Federal brackets, head of household | Rate schedule | irs.gov | Effective 2026-01-0124%/32% boundary corrected from 201,775 (the single-filer figure) to 201,750 for head of household; other bands unchanged. Source: IRS Rev. Proc. 2025-32 sec. 3.01 Table 2. audit 2026-09-23 |
We always strive to use the latest data for every variable so our results and reports are as accurate as possible. Even so, errors are possible — you should not rely on this tool or its report alone, and we accept no liability for any decision made based on it.
The formula
Effective rate = total federal tax / taxable income × 100; marginal rate = the rate of the bracket your last dollar falls in
How it works
It runs your taxable income through the progressive federal brackets for your filing status, sums the tax owed, then reports both the top bracket you reach (marginal) and your overall average rate (effective).
Where it is used
- Seeing why your average tax rate is lower than your top bracket
- Understanding the true cost of one extra dollar of income
- Explaining progressive taxation without the myths
Worked example
On $100,000.00 of taxable income as a single filer, total federal tax is …. That is a marginal rate of … but an effective rate of only …, because only the income inside the top bracket is taxed at the top rate.
What a marginal vs effective tax rate calculator does
The calculator runs your taxable income and filing status through the current federal income tax brackets and reports two numbers that are often confused. The marginal rate is what you would pay on your next dollar of income. The effective rate is the share of your taxable income that goes to federal tax overall.
Side by side they show how progressive taxation works. A filer whose marginal rate sounds high often has a much lower effective rate, because only part of their income is taxed at the top rate.
How the marginal rate is calculated
Each federal bracket covers a band of income and taxes the income inside that band at a fixed rate. Your marginal rate is the rate of the highest bracket your taxable income reaches. If your last dollar falls in the 22% band, your marginal rate is 22%, even though much of your income was taxed at 10% and 12%.
Use the marginal rate for decisions about extra income, such as a bonus, overtime, a side job or a Roth conversion. Each extra dollar is taxed at the marginal rate, so it is the right figure for working out what additional income is worth after tax.
How the effective rate is calculated
The effective rate is your total federal tax divided by your taxable income. The lower brackets tax large parts of your income at 10% and 12%, so the average is always below your top rate. A single filer in the 24% bracket typically has an effective rate in the high teens.
The effective rate is the better number for budgeting and for comparing years, because it reflects the whole bill and not just the last dollar.
A worked example
Take a single filer with $100,000 of taxable income. The first band is taxed at 10%, the next at 12% and the part above the third threshold at 22%, for a total federal tax of about $16,700. The marginal rate is 22% because the last dollar falls in the 22% band, while the effective rate is about 17%.
Reaching the 22% bracket means paying 22% only on the income above the threshold and less on everything below it, which is why the two rates differ by about five points.
Assumptions and limitations
The calculator estimates federal income tax only. It does not include Social Security or Medicare payroll taxes, state or local income taxes, the Alternative Minimum Tax, the Net Investment Income Tax, or credits such as the Child Tax Credit. Credits can lower your actual bill well below what the brackets alone suggest.
It works from taxable income, after deductions. Entering gross income will overstate both rates. The IRS indexes the brackets each year, so revisit the estimate when a new tax year begins or your income changes, and confirm decisions involving real money with a tax professional.
This is general information only and not financial advice.
About This Marginal vs Effective Tax Rate Calculator
Use this marginal vs effective tax rate calculator to get an instant, accurate estimate. The figures follow official IRS guidance and every rate and threshold is kept up to date for 2026. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.
Tax year 2026
Frequently asked questions
What is the difference between a marginal and an effective tax rate?
Why is my effective rate lower than my marginal rate?
Does reaching a higher bracket cut my take-home pay?
Does this calculator include state tax or payroll tax?
Does it use taxable income or gross income?
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