The short answer: in the marginal vs effective tax rate comparison, the marginal rate is the federal income tax rate on the last dollar of taxable income, meaning the rate of the highest bracket that income reaches. The effective rate is the total income tax divided by income, an average across every layer. Because US federal brackets are progressive and each rate applies only to the slice of income inside its bracket, the effective rate is almost always lower than the marginal rate. It also means moving into a higher bracket never raises the tax on the dollars already earned below it.
That last point is the bracket myth, and it is worth taking apart slowly, because it shapes real decisions about raises, overtime and retirement contributions. This article uses the Internal Revenue Service's own published brackets, walks through the arithmetic, and then covers the one place where the myth has a grain of truth.
Figures in this article were checked on September 25, 2026. Brackets and thresholds are adjusted every year, so the numbers below belong to the tax year named next to them.
How the brackets actually work
The IRS describes the system in two sentences on its federal income tax rates and brackets page (read September 25, 2026): income is taxed "in layers called tax brackets," and "when your income jumps to a higher tax bracket, you don't pay the higher rate on your entire income. You pay the higher rate only on the part that's in the new tax bracket."
Picture taxable income as water filling a stack of containers. The first container fills at 10%, the next at 12%, the next at 22%, and so on. Water that has already settled in a lower container stays taxed at that container's rate no matter how much more is poured on top.
These are the 2025 brackets for a single filer, which apply to income earned in 2025 and reported on returns filed in 2026, as published on that same IRS page:
| Rate | Taxable income, single filer, tax year 2025 |
|---|---|
| 10% | $0 to $11,925 |
| 12% | $11,926 to $48,475 |
| 22% | $48,476 to $103,350 |
| 24% | $103,351 to $197,300 |
| 32% | $197,301 to $250,525 |
| 35% | $250,526 to $626,350 |
| 37% | $626,351 and up |
Married couples filing jointly, heads of household and married people filing separately each have their own thresholds on the same page. The seven rates are shared; the dollar edges of each layer differ by filing status.
Two definitions follow from the table:
- Marginal rate: the rate in the highest row that the filer's taxable income reaches. It answers "what happens to the next dollar?"
- Effective rate: total federal income tax divided by income. It answers "what share of income went to federal income tax overall?"
Marginal vs effective tax rate: a worked example
The example below is an illustration with stated assumptions, not a projection for any reader. It assumes a single filer with $60,000 of taxable income in tax year 2025, no credits, and only ordinary income such as wages.
| Layer | Income in the layer | Rate | Tax on the layer |
|---|---|---|---|
| First layer | $11,925 | 10% | $1,192.50 |
| Second layer | $36,550 ($48,475 minus $11,925) | 12% | $4,386.00 |
| Third layer | $11,525 ($60,000 minus $48,475) | 22% | $2,535.50 |
| Total | $60,000 | $8,114.00 |
- Marginal rate: 22%. The last dollar sits in the 22% layer.
- Effective rate on taxable income: about 13.5%. $8,114 divided by $60,000.
Only $11,525 of the $60,000 was taxed at 22%. The other $48,475 was taxed at 10% or 12%, exactly as it would have been if the filer had stopped earning at $48,475.
Which income goes in the denominator?
"Effective rate" has no single official definition, and sources divide by different things. Dividing by taxable income gives one figure. Dividing by a larger number, such as total income before the standard deduction, gives a lower one.
Continuing the illustration: the IRS lists the 2025 standard deduction for a single filer as $15,750 on its Working Families Tax Cuts page for individuals and workers (read September 25, 2026). A single filer whose income was $75,750 before that deduction would land at the same $60,000 of taxable income and the same $8,114 of tax. Measured against $75,750, the effective rate is about 10.7%. Same return, three different percentages: 22% marginal, about 13.5% effective on taxable income, about 10.7% effective on total income. When comparing effective rates between people or articles, the first question is always which income sits underneath.
The figure on the actual return can differ by a few dollars
The IRS publishes a Tax Table in Publication 1040 that lists the tax for narrow bands of taxable income rather than for each exact dollar amount. A return filed using that table can therefore show a tax a few dollars away from the exact layer-by-layer result above. The mechanism is identical; the table just rounds it into bands.
The bracket myth, and why a raise does not shrink pay through brackets
The myth usually sounds like this: "If a raise pushes me into the next bracket, all my income gets taxed at the higher rate and I take home less." Under the federal bracket structure, that cannot happen.
Take the same single filer at $60,000 of taxable income and add $1,000. The extra $1,000 lands in the 22% layer, so federal income tax rises by $220. The earlier $60,000 is taxed exactly as before. Take-home pay from the raise goes up by the other $780 before any other taxes.
Now take a filer sitting right at the top of the 12% layer, at $48,475. A $1,000 raise crosses into the 22% bracket. The whole $1,000 is taxed at 22%, again $220, and the $48,475 underneath is untouched. Crossing a bracket line changes the rate on the dollars above the line and nothing else.
The same logic runs in reverse. A deduction that lowers taxable income removes dollars from the top layer first, so its value is measured at the marginal rate, not the effective rate. That is why the marginal rate matters when weighing a pre-tax contribution, a subject covered in how the traditional vs Roth decision turns on where the tax hits.
Where the myth has a grain of truth: phaseouts and cliffs
The brackets themselves never punish a raise. Other parts of the return sometimes do, and that is where the myth likely comes from.
Many credits and deductions shrink as income rises. The IRS notes on its Topic 551 page on the standard deduction (read September 25, 2026) that the enhanced deduction for seniors age 65 and older is "subject to an adjusted gross income limitation." When a benefit phases out, each extra dollar of income both adds tax at the bracket rate and removes part of the benefit. The combined effect, sometimes called the effective marginal tax rate, can be higher than the bracket rate alone for the income range where the phaseout happens.
A few distinctions keep this straight:
- A phaseout reduces a benefit gradually over a range of income. Extra income still leaves the filer ahead, just by less than the bracket rate alone would suggest.
- A cliff removes a benefit entirely at a single income line. This is the only situation in which a small raise can leave a household with less in hand, and it comes from the benefit rule, not from the brackets.
- Other taxes sit outside the brackets. Social Security and Medicare payroll taxes, capital gains rates and state income taxes follow their own rules and are not part of the seven federal rates shown above.
Whether a particular household sits in a phaseout range depends on its full return, which is a question for a CPA or enrolled agent with the return in hand.
What each rate is useful for
| Question being asked | Rate that answers it |
|---|---|
| How much federal income tax does the next $1,000 of wages add? | Marginal |
| How much does a $1,000 deduction save? | Marginal (if the full $1,000 sits inside one bracket) |
| What share of this year's income went to federal income tax? | Effective |
| How does this year's burden compare with last year's? | Effective, using the same denominator both years |
| How much does a $1,000 credit save? | Neither. A credit reduces tax dollar for dollar |
The last row matters because deductions and credits are often confused. A deduction is worth the deduction amount times the marginal rate. A credit is subtracted directly from the tax. Retirement accounts are the common place where this plays out, since several of them change taxable income now or later; the overview of the main types of retirement accounts sets out which ones do what. The same arithmetic explains why an HSA contribution is often described in terms of the contributor's bracket, as covered in how an HSA's tax layers work.
The 2026 brackets moved, and the rates did not
For tax year 2026, the IRS kept the same seven rates, 10% through 37%, and raised the income thresholds for inflation. In its tax year 2026 inflation adjustment release (IR-2025-103, dated October 9, 2025, read September 25, 2026), the 22% rate for a single filer applies above $50,400, compared with above $48,475 for 2025. Those 2026 figures apply to income earned in 2026 and returns filed in 2027.
Because thresholds shift every year, the same salary can produce a slightly different effective rate from one year to the next even when nothing else changes. The dependable habit is to match the bracket table to the tax year on the return being examined, taken directly from IRS.gov rather than from a secondhand chart.
What this article cannot tell any one reader
This is general information about how the federal arithmetic works, not tax advice. A household's real marginal rate depends on its filing status, the mix of wages and investment income, which credits it claims, and whether any phaseout range applies. The people who can answer that for a specific return are a tax professional such as a CPA or enrolled agent, or an IRS-certified volunteer preparer. What they need is the prior-year return, the current year's W-2s and 1099s, and a list of expected changes in income.
Frequently asked questions
Is the effective tax rate always lower than the marginal rate?
For federal income tax on ordinary income, the effective rate is lower than the marginal rate for almost every filer above the first bracket, because the lower layers are taxed at lower rates. A filer whose entire taxable income falls in the 10% layer has a marginal rate and effective rate that are close to equal.
Can moving into a higher tax bracket reduce take-home pay?
Not through the brackets. The higher rate applies only to the income above the bracket line, as the IRS states on its brackets page. A net loss from a raise can only come from a benefit that ends at a set income level, which is a separate rule.
How is the effective tax rate calculated?
Divide total federal income tax by income. Sources differ on which income to use, taxable income or total income, so the same return can show more than one effective rate. The key is naming the denominator.
Which tax rate matters for a deduction?
A deduction lowers taxable income from the top layer down, so its value is generally the deduction amount times the marginal rate. A credit is different: it lowers the tax itself, dollar for dollar.
Where are the official brackets for each year published?
On IRS.gov. The federal income tax rates and brackets page lists the current filing year's tables, and each year's inflation adjustment release announces the next year's thresholds.
