How US Federal Tax Brackets Work

Every conversation about US income tax eventually hits the same sentence: "if I earn one more dollar I get bumped into the next bracket and take home less." It is wrong, and unpicking it takes about ninety seconds.

Figures here are for tax year 2026, single filer, from the IRS inflation adjustments¹. The structure has not changed in years; only the thresholds move.

The 2026 brackets

These apply to taxable income, which is what is left after the standard deduction. For 2026 that deduction is 16,100 for a single filer and 32,200 for a married couple filing jointly¹, so a single person earning 76,100 has roughly 60,000 of taxable income.

Rate	Single	Married filing jointly
10%	up to 12,400	up to 24,800
12%	to 50,400	to 100,800
22%	to 105,700	to 211,400
24%	to 201,775	to 403,550
32%	to 256,225	to 512,450
35%	to 640,600	to 768,700
37%	above that	above that

Our Tax Bracket Calculator holds these figures along with 2025, 2024 and 2023, so you can compare years without looking anything up.

Marginal is the word doing all the work

Each rate applies only to the slice of income inside its band. Crossing a threshold does not re-tax anything below it.

On 60,000 of taxable income the naive reading is "22 percent of 60,000, so 13,200". The actual calculation:

• First 12,400 at 10 percent: 1,240
• Next 38,000 at 12 percent: 4,560
• Last 9,600 at 22 percent: 2,112

Total 7,912, which is 13.2 percent of the income.

Twenty-two percent was the marginal rate, what one more dollar would cost. Thirteen point two was the effective rate, what the whole thing cost. Almost every planning decision uses the first number and almost every conversation means the second.

The raise myth, with the arithmetic

Add a 1,000 raise to that 60,000.

• Everything up to 50,400 is unchanged: 5,800
• The remaining 10,600 at 22 percent: 2,332
• New total: 8,132

You paid 220 more federal tax on 1,000 of new income and kept 780. There is no income, in any bracket, where an extra dollar leaves you worse off.

The real cliffs exist elsewhere. Credits and benefits that phase out at income thresholds can genuinely take back more than you gained, and the Earned Income Tax Credit and various education credits work that way. Those are phase-outs, not brackets, and each has its own table worth checking.

Where the two rates diverge

At 300,000 of taxable income the marginal rate is 35 percent and the effective rate is 24.6 percent. The gap widens as income rises, because more of the income sits in bands below the top one.

Two sanity checks that catch most errors:

1. Effective should always be below marginal, unless the whole income fits in the bottom bracket.
2. Marginal should only change at a threshold. If a tool shows it climbing smoothly, it is mixing in phase-outs.

Pre-tax contributions buy the marginal rate

This is the practical payoff. Each pre-tax dollar into a traditional 401(k), traditional IRA or HSA reduces taxable income by a dollar, and that dollar comes off the top, so it dodges the marginal rate.

At 100,000 of 2026 taxable income, contributing 10,000 pre-tax:

• Tax on 100,000: 16,712
• Tax on 90,000: 14,512
• Saved this year: 2,200, exactly 22 percent of the contribution

The money is taxed later instead, at whatever bracket you are in then. Someone retiring onto 50,000 of taxable income pays 12 percent on that withdrawal rather than today's 22, and that gap is most of the argument for pre-tax accounts. Pair it with the Investment Return Calculator to see what the deferred amount does in the meantime.

What the brackets do not cover

Federal income tax is one line on the payslip. Also there:

• Social Security, 6.2 percent up to an annually adjusted wage ceiling². A flat rate, not a bracket, and it stops entirely above the cap.
• Medicare, 1.45 percent on all wages with an additional 0.9 percent for high earners, and no ceiling.
• State income tax, which has its own brackets in most states and none at all in a handful including Texas and Florida.
• Local income tax, in New York City, Philadelphia and a few other places.

When someone says "I'm taxed 30 percent", they are usually adding all of these together, which is a fair description of the payslip and not a statement about the federal bracket.

Do not add marginal rates from different layers and treat the sum as an effective rate. State taxable income is computed differently from federal, and the two systems have different deductions, so they have to be worked separately and then added in dollars. The percentage calculator handles the state side once you have its rates.

Bracket creep, and why nothing happens

The thresholds move every year with inflation, which is why the same real income drifts very slightly down the effective-rate scale rather than up it. The 2026 adjustments were around 2.7 percent on average¹.

That indexing is the reason bracket creep stopped being a live political issue. Before automatic indexing, inflation alone pushed people into higher brackets every year without anyone earning more in real terms, which is a tax rise nobody has to vote for.

The shape of it

You are not optimising against one rate. You are managing slices of income, each taxed at its own rate, with a deduction taken off the bottom before any of it starts.

Once that picture is in place the rest of personal tax arithmetic is careful percentages applied in the right order, which is what the Tax Bracket Calculator is for.