How Tax Brackets Really Work

The story: Alex and the raise myth

Alex and Jade talk at a kitchen table about a raise, with a chart that splits income into slices taxed at different rates.

1. Narrator: Alex just got a raise at work. Then a friend said something that made Alex worry.
2. Jade: Careful! A raise can push you into a higher bracket, and then you take home less.
3. Alex: Wait, really? Should I turn the raise down?
4. Narrator: It’s a myth. Brackets are slices. Each rate taxes only the income inside its own slice.
5. Narrator: Made-up example: 10% on the first $12,000 of taxable income, 20% on the rest. Only the dollars in the 20% slice pay 20%.
6. Alex: So if my raise adds $600 in the 20% slice, I keep $480 of it. More pay is still more pay.
7. Narrator: A higher bracket only taxes the extra slice.

What you’ll learn

1. Taxable income

   Taxable income is income minus a deduction. Most people take the standard deduction, a set amount that isn’t taxed. For a single filer this year, it’s $16,100.

2. If someone can claim you

   A parent or someone else may be able to claim you as a dependent. Then your standard deduction is usually smaller and tied to what you earned. The rules are on the fact card, and a lesson on being a dependent is coming.

3. Each slice, its own rate

   Income is split into slices called tax brackets. Each rate applies only to the income inside its slice. Your marginal rate is the rate on your last slice, not on all your income.

   Example, made-up brackets: $18,000 taxable. $12,000 × 10% = $1,200. $6,000 × 20% = $1,200. Total tax: $2,400.

4. Busting the raise myth

   A raise into a higher bracket is taxed at the higher rate only on the extra dollars. So after income tax, more pay always means more take-home. The myth comes from thinking the new rate hits every dollar.

Key words

taxable income

income minus a deduction; the part the brackets apply to

standard deduction

a set amount of income that isn’t taxed

tax bracket

a slice of income taxed at its own rate

marginal rate

the rate on your last slice of income

Common questions

What is the effective rate?

It’s your total tax divided by your taxable income. It’s lower than your marginal rate when your lower slices are taxed at lower rates.

Remember this

A higher bracket only taxes the extra slice.

Try it: Bust the raise myth

1. Explain the raise myth to a friend or family member.
2. Or write it in 3 sentences, using the made-up brackets from this lesson.

Explain the raise myth to a friend or family member, or write it in 3 sentences.

Live facts

Numbers that change over time, with when they were last checked and where they come from.

• Standard deduction, single

  $16,100

  Income a single filer can earn before federal income tax starts

  As of 2026

  Source: IRS.gov(opens in a new tab)

• This year’s federal tax brackets

  Source: IRS.gov(opens in a new tab)

• Standard deduction for someone claimed as a dependent

  Source: IRS Publication 501(opens in a new tab)