How federal tax brackets actually work, with the math

A federal tax bracket is a rate applied to one slice of your taxable income, not to all of it. A single filer earning $120,000 in 2026 has $103,900 of taxable income after the $16,100 standard deduction, sits in the 22% bracket, and owes $17,570 in federal income tax: an effective rate of 14.6%. Moving into a higher bracket only changes the tax on the dollars above the line, so the brackets alone can never make a raise cost you money.

That misunderstanding talks people out of overtime, bonuses and raises. Below is the arithmetic on the official 2026 figures from IRS Revenue Procedure 2025-32, plus the 2026 phase-outs that do push some people's real rate above their bracket.

The 2026 federal tax brackets

The seven rates (10%, 12%, 22%, 24%, 32%, 35%, 37%) are now permanent: Public Law 119-21, enacted July 4, 2025, removed their scheduled expiry after 2025, as section 2.01 of Rev. Proc. 2025-32 explains. The dollar thresholds move with inflation each year.

These are taxable-income figures. The 2026 standard deduction comes off first: $16,100 single, $32,200 married filing jointly, $24,150 head of household.

Marginal rate versus effective rate

• Marginal rate: the rate on your next dollar of taxable income. This is your "tax bracket".
• Effective rate: total income tax divided by total income. This is what you pay on average.

At $250,000 the bracket is 32% but the effective rate is 20.5%. The gap is the whole point: the first $16,100 is not taxed, and the next slices are taxed at 10%, 12%, 22% and 24% before any dollar reaches 32%.

One calculation, all the way through

A single filer earning $120,000 in 2026, taking the standard deduction.

Step 1. Subtract the standard deduction: $120,000 minus $16,100 leaves $103,900 of taxable income.

Step 2. Tax each slice at its own rate.

Step 3. Divide by gross income. $17,570 divided by $120,000 is an effective rate of 14.6%. The marginal rate is 22%, and this filer has $1,800 of room before any income hits 24%, because that band starts at $105,700.

You can check the result against the IRS shortcut in Rev. Proc. 2025-32: for taxable income between $50,400 and $105,700 the tax is $5,800 plus 22% of the excess over $50,400. That is $5,800 plus $11,770, or $17,570.

The raise myth, in dollars

Take a single filer whose salary rises from $100,000 to $110,000 in 2026.

The extra $10,000 costs $2,200 in federal income tax, all at 22%. Social Security (6.2%) and Medicare (1.45%) take another $765, per IRS Topic 751. That leaves $7,035 before state tax: less than $10,000, and always more than zero.

Married filing jointly changes the arithmetic

Joint thresholds are exactly double the single ones up to where the 37% band starts, and the joint standard deduction is double too. So one earner filing single on $120,000 and a married couple with $120,000 of combined income pay very different amounts.

The joint return has $87,800 of taxable income, all of it in the 10% and 12% bands, for $10,040 of tax. The only threshold that is not doubled is the start of the 37% band: $768,700 joint against $640,600 single.

Your real marginal rate can be higher than your bracket

Your bracket is the federal income tax rate on the next dollar. What you actually lose on that dollar adds payroll tax, and in some income ranges a deduction that shrinks as income rises. Several 2026 deductions from the 2025 law do that:

• The senior deduction of $6,000 per person 65 or older falls by 6% of modified AGI above $75,000 ($150,000 joint), under 26 U.S.C. section 151(d)(5)(C).
• The overtime and tips deductions fall by $100 for each $1,000 of modified AGI above $150,000 ($300,000 joint), under section 225(b) and section 224(b).
• The SALT cap of $40,400 falls by 30% of modified AGI above $505,000 until it reaches $10,000, under section 164(b)(7).

The SALT range runs from $505,000 to about $606,333 of modified AGI, where the cap bottoms out at $10,000. Inside it, an itemizer in the 35% bracket pays 45.5 cents of federal income tax on each extra dollar. Every one of these rates is still below 100%, so earning more still leaves you with more.

How to compute your own

1. Start with gross income and subtract pre-tax items such as 401(k) contributions to get adjusted gross income.
2. Subtract the standard deduction or your itemized total, whichever is larger, plus any deductions you can take either way, such as the senior deduction.
3. Run what is left through the bands above, one slice at a time.
4. Subtract credits, then divide by gross income for your effective rate.

The tax bracket headroom tool shows how many dollars you can add before the next band starts. Thresholds change each year with inflation; see the projected 2027 brackets for how the next set is computed.

Four things that are not your tax bracket

• Payroll tax is separate and starts at the first dollar of wages: 7.65% up to the 2026 Social Security wage base of $184,500, then 1.45%.
• State income tax runs on its own schedule.
• Long-term capital gains and qualified dividends have their own 0%, 15% and 20% schedule, stacked on top of ordinary income. In 2026 the 0% rate covers taxable income up to $49,450 single or $98,900 joint.
• Withholding is an estimate your employer makes, not your tax. A refund means you prepaid too much. See how your W-4 controls withholding.

Why the myth survives

"Moving into a higher bracket" sounds like the whole income gets repriced. And people sometimes do take home less after a raise, but the cause is usually on the payslip: a bigger 401(k) contribution set as a percentage, a health plan change, or a bonus withheld at the flat 22% supplemental rate in IRS Publication 15, which settles when you file. If your take-home fell after a raise, read the deduction lines on the payslip before blaming the bracket.

Frequently asked questions

Sources

1. Revenue Procedure 2025-32 (2026 tax rate tables and standard deduction), Internal Revenue Service. Checked October 2026.
2. Topic no. 751, Social Security and Medicare withholding rates, Internal Revenue Service. Checked October 2026.
3. Topic no. 560, Additional Medicare Tax, Internal Revenue Service. Checked October 2026.
4. 26 U.S. Code section 151 (senior deduction), Legal Information Institute, Cornell Law School. Checked October 2026.
5. 26 U.S. Code section 225 (qualified overtime compensation), Legal Information Institute, Cornell Law School. Checked October 2026.
6. 26 U.S. Code section 164 (SALT limitation), Legal Information Institute, Cornell Law School. Checked October 2026.
7. Publication 15 (2026), Employer's Tax Guide (supplemental wage withholding), Internal Revenue Service. Checked October 2026.
8. One, Big, Beautiful Bill Act: tax deductions for working Americans and seniors, Internal Revenue Service. Checked October 2026.