How the US Federal Tax Brackets Work

July 29, 2026 · updated September 1, 2026

Last reviewed September 2026 · general information, not tax advice

The single most common misunderstanding about US income tax is the belief that a raise which pushes you “into the next bracket” could leave you with less money overall. It cannot. Understanding why also clears up decisions about overtime, bonuses, and retirement contributions.

Brackets are marginal

The US federal income tax is a progressive marginal system. Each bracket’s rate applies only to the portion of your taxable income that falls inside that bracket, not to your entire income.

Using 2026 single-filer figures (IRS Rev. Proc. 2025-32):

Married-filing-jointly brackets are roughly double the single amounts through the 32% bracket (10% to $24,800, 37% above $768,700); head-of-household sits in between.

A worked example

Suppose your taxable income is $60,000 (single). You pay:

• 10% on the first $12,400 = $1,240.00
• 12% on the next $38,000 ($12,400 → $50,400) = $4,560.00
• 22% on the last $9,600 ($50,400 → $60,000) = $2,112.00
• Total federal income tax: $7,912 — an effective rate of about 13.2%, even though your marginal rate (the rate on your next dollar) is 22%.

Now a $5,000 raise takes taxable income to $65,000. The whole raise falls in the 22% bracket, so you owe $1,100 more and keep $3,900 of the $5,000. Your existing $60,000 is taxed exactly as before. There is no cliff for “crossing into” the bracket — only the new dollars are taxed at the new rate.

Marginal vs effective rate

• Marginal rate — the rate on your next (or last) dollar. Use it for decisions: “if I work this overtime / take this bonus / contribute $1,000 pre-tax, what changes?” In the example, an extra $1,000 earned keeps $780; $1,000 into a traditional 401(k) saves $220 in federal tax.
• Effective rate — total tax ÷ total income. It describes your overall burden and is always lower than your marginal rate (unless every dollar sits in the bottom bracket).

Taxable income is not gross income

Brackets apply to taxable income:

gross pay − pre-tax deductions (401k, HSA, health premiums) − the standard deduction (or itemised deductions)

In 2026 the standard deduction is $16,100 (single) and $32,200 (married filing jointly). So a single person earning $75,000 gross with a 6% traditional 401(k) contribution ($4,500) has taxable income of about $75,000 − $4,500 − $16,100 = $54,400 — putting only about $4,000 of their income into the 22% bracket. See pre-tax vs post-tax deductions.

Where credits fit

Deductions reduce the income the brackets are applied to. Credits reduce the tax itself, dollar for dollar, after the bracket math. The Child Tax Credit ($2,000 per qualifying child, partially refundable) and the $500 credit for other dependents are the common ones for wage earners. A $2,000 credit is worth $2,000 regardless of bracket; a $2,000 deduction is worth $2,000 × your marginal rate.

Bonuses are withheld, not taxed, differently

A bonus is often withheld at a flat 22% federal supplemental rate (37% on the portion of supplemental wages over $1 million). That is a withholding convention, not a special tax rate — at year end the bonus is just ordinary income taxed at your normal brackets, and you get the difference back as a refund (or owe more if 22% was too low for you). If bonuses are a big part of your pay and 22% is wrong for your bracket, adjust line 4(c) on your W-4.

Capital gains and qualified dividends are separate

Long-term capital gains (assets held over a year) and qualified dividends are taxed on their own schedule — 0%, 15%, or 20% depending on your total taxable income — not the ordinary brackets above. Short-term gains (held a year or less) are taxed as ordinary income. The paycheck calculator here covers wage income only.

Bracket creep and inflation

The IRS adjusts the bracket thresholds and the standard deduction for inflation every year, which largely (not perfectly) offsets “bracket creep” — inflation pushing you into higher brackets on the same real income.

A married-filing-jointly example

Say a couple has $150,000 of taxable income in 2026 (after the $32,200 standard deduction and any pre-tax deductions). Using the MFJ brackets:

• 10% on the first $24,800 = $2,480
• 12% on the next $51,150 ($24,800 → $75,950) = $6,138
• 22% on the next $75,850 ($75,950 → $150,000) = $16,687 (they do not fill this bracket, which runs to about $206,700)
• Total: about $25,305, an effective rate of roughly 16.9%, with a marginal rate of 22%.

If one spouse takes a $10,000 raise, all of it is taxed at 22% (they are well inside that bracket), so they keep $7,800 of it. The “marriage” question — whether filing jointly helps or hurts — usually helps when incomes are uneven and is roughly neutral when both earn similarly.

Phase-outs and the extra layers high earners hit

The headline brackets are not the whole story once income climbs:

• The 0.9% Additional Medicare Tax and the 3.8% Net Investment Income Tax kick in above $200,000 single / $250,000 MFJ.
• Itemised-deduction and credit phase-outs — the Child Tax Credit, education credits, IRA deductibility, and others shrink or disappear over defined income ranges, which raises the effective marginal rate inside those ranges above the stated bracket.
• The Alternative Minimum Tax (AMT) is a parallel calculation with its own exemption and 26%/28% rates; you pay the higher of the two. Far fewer households hit it since the exemption was raised, but large state-tax or incentive-stock-option situations can trigger it.

None of these change the core rule — more income never means less take-home — but they mean your true marginal rate in certain bands is higher than the bracket table alone suggests.

Common misconceptions

• “A raise can leave me worse off.” No. Only the new dollars are taxed at the higher rate.
• “My bonus was taxed at 40%.” That was withholding; the actual tax is your bracket rate, reconciled on your return.
• “I’m in the 22% bracket, so I pay 22% of everything.” You pay ~13% of everything in the $60k example; 22% is only the top slice.

The bottom line

A raise, a bonus, or overtime always increases your take-home pay. Track your marginal rate for decisions and your effective rate for the big picture. The paycheck calculator reports both on your own numbers, using the verified 2026 federal brackets and standard deduction.