Taxation
Marginal vs. Effective Tax Rate
Your marginal rate is the tax on your next dollar of income. Your effective rate is the tax on all of it, blended together.
Definition
The marginal tax rate is the rate applied to the next dollar you earn — the rate charged on the top slice of your income.
The effective tax rate is the rate you actually pay overall: total tax owed divided by total income. Because income is taxed in slices rather than all at one rate (more on why below), the effective rate is always lower than the marginal rate whenever more than one slice of your income is involved.
Why this exists
Imagine if earning one more dollar bumped your entire income into a higher tax rate. A raise could then leave you with less take-home pay than before, once your whole paycheck got taxed at the new, higher rate — earning more would sometimes make you worse off. That would punish people for earning more and discourage anyone from taking a raise, a bonus, or a better job — a bad incentive to build into a tax system.
Most income tax systems avoid this by taxing income in slices instead of all at once. Income is divided into brackets (ranges of income, sometimes also called bands), and each bracket has its own rate. Only the portion of your income that falls inside a given bracket is taxed at that bracket's rate — the rest is still taxed at the lower rates for the brackets beneath it. This design is called a progressivetax system, and it's why earning more can never actually shrink your take-home pay.
The distinction between marginal and effective rates matters because brackets are usually described by their top rate ("the 32% bracket"), which makes it easy to assume your whole income gets taxed at that rate. It doesn't — the effective rate, which blends every bracket you touched, is what tells you the real, overall cost.
Formula, mechanics & worked example
United States brackets (illustrative)
Illustrative federal brackets for a single filer (someone filing taxes individually rather than jointly with a spouse) — not current figures from the IRS, the U.S. tax authority.
| Income range | Marginal rate |
|---|---|
| $0 – $11,000 | 10.0% |
| $11,001 – $44,725 | 12.0% |
| $44,726 – $95,375 | 22.0% |
| $95,376 – $182,100 | 24.0% |
| $182,101 – $231,250 | 32.0% |
| $231,251 – $578,125 | 35.0% |
| $578,126 – and above | 37.0% |
Worked example: $90,000 income
Try it yourself
Total tax owed
$15,108
Marginal rate
22.0%
Effective rate
16.8%
How the math works
Illustrative federal brackets for a single filer (someone filing taxes individually rather than jointly with a spouse) — not current figures from the IRS, the U.S. tax authority. Illustrative only — not current official figures.
10.0% on $11,000 = $1,100 12.0% on $33,725 = $4,047 22.0% on $45,275 = $9,961
Your marginal rate (22.0%) is the rate on your top slice of income only. Your effective rate (16.8%) blends every bracket you passed through — which is always the lower, more accurate picture of your real overall tax burden.
Common misconceptions
“Earning more can put you in a higher bracket and shrink your take-home pay.”
Because only the income above each threshold is taxed at the higher rate, earning one more dollar can never reduce your after-tax income in a standard progressive system — your take-home pay still rises, just by slightly less per dollar in the new bracket.
“Your marginal rate is the rate you pay on all your income.”
Your marginal rate only applies to the top slice of income. The rest is taxed at the lower rates for the brackets beneath it, which is exactly why the effective rate — the blended average — is always lower than the marginal rate whenever more than one bracket applies.
“Two countries with the same top marginal rate tax people the same amount.”
Effective rates depend on the entire bracket structure — where the thresholds between brackets sit, how many brackets there are, and whether any income is taxed at 0% — so two systems with an identical top rate can produce very different effective rates for the same income.
Also in the Glossary: Effective Tax Rate, Marginal Tax Rate, Tax Bracket