How Tax Brackets Actually Work (Marginal vs Effective Tax Rate)

Tax brackets are one of the most misunderstood parts of a paycheck. Almost everyone has heard that earning more can push you into a higher tax bracket, and it is easy to picture that as a switch: cross a line, and suddenly every dollar you make is taxed at the higher rate.

That is not how tax brackets work. The real mechanic is simpler than the myth, and once you see it, the two rates people mix up (marginal and effective) stop being confusing.

The short version: a bracket's rate applies only to the dollars inside that bracket, so moving up a bracket never re-taxes the dollars below it.

Your income is taxed in slices, not all at one rate

Federal income tax is progressive, which means your income is cut into slices and each slice is taxed at its own rate. The first slice is taxed at 10 percent. The next slice is taxed at 12 percent. The slice after that at 22 percent, and so on up the ladder.

So when someone says "I am in the 22 percent bracket", that describes only where the top of their income landed. Every dollar underneath is still taxed at the lower rate of the slice it fell into.

your tax = each slice of income, multiplied by that slice's own rate, all added up

The 2026 federal tax brackets

For tax year 2026, a single filer's taxable income falls into these seven bands, published by the IRS in Revenue Procedure 2025-32:

• 10 percent on the first 12,400 dollars
• 12 percent from 12,400 to 50,400 dollars
• 22 percent from 50,400 to 105,700 dollars
• 24 percent from 105,700 to 201,775 dollars
• 32 percent from 201,775 to 256,225 dollars
• 35 percent from 256,225 to 640,600 dollars
• 37 percent above 640,600 dollars

Two details change how that list is read. First, the bands apply to taxable income, which is what is left after subtracting the standard deduction (16,100 dollars for a single filer in 2026) or itemized deductions, not to your gross salary. Second, the dollar thresholds differ by filing status and are re-indexed for inflation every year, while the seven rates themselves were made permanent by the 2025 tax law (Public Law 119-21).

A worked example on a 75,000 dollar salary

Take a single filer earning 75,000 dollars who takes the standard deduction.

1. Subtract the standard deduction: 75,000 minus 16,100 leaves 58,900 dollars of taxable income.
2. The first 12,400 dollars is taxed at 10 percent, which is 1,240 dollars.
3. The next 38,000 dollars (from 12,400 up to 50,400) is taxed at 12 percent, which is 4,560 dollars.
4. The last 8,500 dollars (from 50,400 up to 58,900) is taxed at 22 percent, which is 1,870 dollars.

Add the three slices and the federal income tax is 7,670 dollars. Only 8,500 dollars of that salary was ever touched by the 22 percent rate.

Marginal vs effective tax rate

Those two numbers each have a name, and the difference between them is the whole point.

• Your marginal tax rate is the rate on your next dollar, which is the bracket your top slice sits in. In the example above, that is 22 percent.
• Your effective tax rate is your total tax divided by your income, which is what the tax works out to on average. In the example, 7,670 divided by 58,900 is about 13 percent of taxable income, and about 10 percent of the full 75,000 dollar salary.

effective tax rate = total tax divided by total income

In a progressive system the effective rate is always lower than the marginal rate, because the slices underneath were taxed at lower rates. The two only converge at very high incomes, where most of the income sits in the top band.

What a raise does to your tax

Because a higher rate only reaches the dollars above its threshold, crossing into a new bracket does not shrink take-home pay. On the 75,000 dollar salary above, a 2,000 dollar raise moves taxable income from 58,900 to 60,900 dollars. All 2,000 of those new dollars sit in the 22 percent band, so the extra federal income tax is 440 dollars and 1,560 dollars stays in the paycheck.

The same logic runs in the other direction: a deduction that reduces taxable income removes dollars from the top slice first, so it comes off at the marginal rate rather than the effective one.

One boundary on all of this: these numbers cover federal income tax only. Payroll taxes for Social Security and Medicare, state income tax where it applies, and income-tested benefits or credits each follow their own rules, and any of them can change what an extra dollar is worth.

Seeing it on your own timeline

Brackets are arithmetic, not opinion. Your own marginal and effective rates depend on your income, your filing status, and your deductions, and they move every year your income does. That also feeds other questions about when money is taxed, like how Traditional and Roth accounts are taxed, where the rate you pay now versus later is the deciding variable.

VividTimeline applies the current federal brackets to each year of your plan and shows the resulting tax alongside your balances, so the marginal and effective rates you would face are visible year by year instead of estimated once.