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Income Tax Brackets, Explained

After reading this you will be able to compute US federal income tax slice by slice, tell your marginal rate from your effective rate, and check both against a worked example you can reproduce with one click.

What a tax bracket actually does

A tax bracket taxes a slice of income, not your whole income. This is the single most misunderstood idea in personal tax. Many people believe that crossing into a higher bracket raises the rate on every dollar they earn. It does not. Only the dollars inside that bracket pay the higher rate.

Here is the hook. Suppose you are single in the United States in 2025 and a raise pushes your taxable income from $48,000 to $48,500. The 22% bracket for a single filer begins at $48,475. So only $25 of your new income sits in the 22% bracket. That slice costs 0.22 \times 25 = 5.50 dollars. The rest of the raise is still taxed at 12%. Nobody takes home less money by earning more.

The tool covers two systems. The US uses graduated brackets on top of a standard deduction. Hungary uses a flat 15% personal income tax with no bracket structure at all, which makes it a clean contrast case.

When this calculator helps, and when it does not

Use it to answer questions like: what is my rough federal tax on a given salary, how much of my next raise goes to tax, and how does my effective rate change as income rises. It is a teaching estimate.

Do not treat the output as your filing number. It ignores state and local income tax, tax credits (such as the Child Tax Credit), itemized deductions above the standard deduction, retirement contributions that lower taxable income, capital gains treated at separate rates, and payroll taxes for Social Security and Medicare. A real return can differ by thousands of dollars.

If you want the number that hits your bank account after all deductions, this is the wrong tool. Federal income tax is only one line. Use the Take-Home Pay Calculator for a fuller gross-to-net picture.

The formula and the intuition

Two steps. First, subtract the standard deduction to get taxable income. Second, walk up the brackets and tax each slice at its own rate.

T = \max(0,\ G - D)

Here G is gross income, D is the standard deduction, and T is taxable income. For 2025 the standard deduction is $15,000 for a single filer and $30,000 for married filing jointly.

\text{Tax} = \sum_{i} r_i \times \big(\min(T, u_i) - \ell_i\big)^{+}

Each bracket i has a rate r_i, a lower edge \ell_i, and an upper edge u_i. The notation (x)^{+} means "take x if positive, otherwise 0", so a bracket you have not reached contributes nothing. You pay r_i only on the part of T that falls between \ell_i and u_i.

The 2025 single-filer brackets are:

US federal brackets, single filer, tax year 2025
RateLower edgeUpper edge
10%$0$11,925
12%$11,925$48,475
22%$48,475$103,350
24%$103,350$197,300
32%$197,300$250,525
35%$250,525$626,350
37%$626,350and up

Your marginal rate is r_i for the top bracket you reach. Your effective rate is total tax divided by gross income. Because the lower slices are taxed at lower rates, the effective rate is always below the marginal rate once you are past the first bracket.

Worked example: $75,000, single

These are the tool's demo defaults, so pressing Calculate reproduces every number below.

  1. Taxable income: 75000 - 15000 = 60000 dollars.
  2. 10% slice: from $0 to $11,925, that is 0.10 \times 11925 = 1192.50.
  3. 12% slice: from $11,925 to $48,475, a width of $36,550, so 0.12 \times 36550 = 4386.00.
  4. 22% slice: from $48,475 up to $60,000, a width of $11,525, so 0.22 \times 11525 = 2535.50.
  5. Total tax: 1192.50 + 4386.00 + 2535.50 = 8114.00 dollars.

Marginal rate: 22%, because the last dollar of taxable income sits in the 22% bracket. Effective rate on gross income: 8114 / 75000 = 0.1082, or 10.82%. Notice how far the effective rate (10.82%) sits below the marginal rate (22%). That gap is the whole point of a graduated system.

Watch the slices fill up

The chart below shows the same $75,000 single filer. Each bar is the tax paid inside one bracket. The 12% bracket is the widest, so it contributes the most dollars even though it is not the top rate.

Three slices add to $8,114. The middle slice is largest because the 12% bracket is the widest band of income.

Reading and interpreting the two rates

Keep the two rates separate in your head, because they answer different questions.

Marginal rate
The rate on your next dollar. Use it for decisions: how much a raise, a bonus, or an extra freelance invoice keeps after federal tax. At $75,000 single, an extra $1,000 costs 0.22 \times 1000 = 220 in federal tax, leaving $780.
Effective rate
The rate on your whole income. Use it to compare years or to describe your overall burden. At $75,000 single it is 10.82%.

As income climbs, the effective rate rises toward the marginal rate but never reaches it (until you are entirely inside the top bracket, which requires income far above the bracket edges). The curve below traces the effective rate for a single filer from $20,000 to $300,000. The marker sits at the $75,000 demo point.

The effective rate rises smoothly and stays well below the top marginal rate at every income shown.

Without JavaScript: raise income and the tax splits across more bracket slices. At $40,000 taxable, tax is $1,192.50 (10%) plus $3,369 (12%) = $4,561.50. At $60,000 taxable it adds a 22% slice of $2,535.50 for $8,114 total. The marginal rate jumps in steps (10, 12, 22, 24 percent) while the effective rate climbs as a smooth curve below it.

Common mistakes

Mistake 1: fearing a raise. Crossing into a higher bracket never lowers take-home pay. Only the slice above the edge pays the higher rate. Model your raise with the Pay Raise Calculator and apply your marginal rate to the increase.

Mistake 2: taxing gross instead of taxable income. The brackets apply after the standard deduction. Forgetting the deduction on a $75,000 single income overstates tax by taxing an extra $15,000. That extra sits mostly in the 22% band, so the error is roughly 0.22 \times 15000 = 3300 dollars.

Mistake 3: confusing marginal with effective. Saying "I am in the 22% bracket so I pay 22%" is wrong. The demo filer pays 10.82% overall.

Mistake 4: expecting this to match your paycheck. Withholding, payroll tax, state tax, and credits all move the real number. This estimate is federal income tax only.

For a quick sanity check, remember the demo anchor: $75,000 single gives $8,114 federal tax, a 22% marginal rate, and a 10.82% effective rate. If your own numbers land near that scale for a similar income, your arithmetic is on track.

Related tools

Tax is one piece of what your work pays you. These tools cover the neighbors:

Two more for the cost side of work: the Commute Cost Calculator and the Meeting Cost Calculator.

Frequently asked questions

Does moving into a higher tax bracket reduce my take-home pay?

No. Only income above the bracket edge is taxed at the higher rate. If a raise puts $25 into the 22% bracket, that $25 costs $5.50, and every dollar below the edge keeps its old, lower rate.

What is the difference between marginal and effective tax rate?

Marginal is the rate on your next dollar (the top bracket you reach). Effective is total tax divided by gross income. For $75,000 single in 2025, marginal is 22% and effective is 10.82%.

Why does Hungary show a single flat rate?

Hungary's personal income tax is a flat 15% with no bracket structure, so marginal and effective rates are both 15% (before any allowances the tool does not model). On $75,000 equivalent income that is 0.15 \times 75000 = 11250.

Why is my real tax bill different from this estimate?

This tool covers only federal income tax with the standard deduction. It ignores state tax, payroll tax, tax credits, itemized deductions, and retirement contributions, each of which can move the number by hundreds or thousands of dollars.

Does married filing jointly just double everything?

Roughly, for lower brackets. The 2025 standard deduction doubles to $30,000, and the bracket edges through the 35% band are twice the single edges. The top 37% threshold is not exactly double, so very high incomes differ.

Every figure here uses 2025 federal brackets and standard deductions and is an educational estimate, not financial advice. Talk to a qualified adviser before making money decisions.

Try it yourself in the tool

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