Tax brackets and the marginal rate.
Moving into a higher bracket does NOT mean all your income gets taxed at the higher rate. Only the dollars above the bracket threshold do. The math behind one of the most-misunderstood ideas in personal finance.
A co-worker is offered a raise from $46,000 to $48,000. Instead of celebrating, she frets: "That's going to push me into the 22% bracket. I might actually end up with less take-home pay than before." It is one of the most widespread misconceptions in personal finance, repeated in family dinners and break-room conversations across the country — and it is mathematically wrong.
The U.S. federal income tax is a progressive tax. Each successive slice of income is taxed at its own rate: the first $11,600 at 10%, the next $35,550 at 12%, the next slice at 22%, and so on. Moving into the 22% bracket does not mean all your income gets taxed at 22%. It means only the dollars above the bracket's threshold do. A raise from $46,000 to $48,000 means only the new $2,000 (and only the portion of that above the 22% threshold) gets taxed at 22%; the rest of your income continues to be taxed exactly as before.
This lesson develops the bracket math precisely and introduces the two different rates that matter: the marginal rate (what the next dollar earned would be taxed at) and the effective rate (total tax divided by total income, always lower than the marginal rate in a progressive system).
Stair-step the tax, slice by slice.
10% on the first $11,600 · 12% from $11,600 to $47,150 · 22% from $47,150 to $100,525 · 24% from $100,525 to $191,950 · 32% from $191,950 to $243,725 · 35% from $243,725 to $609,350 · 37% above $609,350
To compute the total tax owed, you stair-step across the brackets: tax the first slice at its rate, the second slice at its rate, and so on, summing as you go. Two derived numbers fall out of the calculation. The marginal rate is the rate of the top bracket you reach — the rate at which the next dollar earned would be taxed. The effective rate is the total tax owed divided by the total taxable income, expressed as a percent. The effective rate is always less than the marginal rate (because the lower slices were taxed at lower rates).
A $60,000 income split across three brackets. The 10% bracket contributes $1,160; the 12% bracket contributes $4,266; the partial 22% bracket contributes $2,827. Total tax = $8,253. Marginal rate = 22%; effective rate ≈ 13.76%.
The marginal tax rate is the rate of the highest bracket the taxpayer's income reaches — the rate at which the next dollar earned would be taxed. The effective tax rate is total tax owed divided by total taxable income. In a progressive system, the effective rate is always less than the marginal rate.
Words you'll see in tax-prep software
- Progressive tax A tax in which higher slices of income are taxed at higher rates. The opposite is a flat tax, where every dollar is taxed at the same rate. Most developed economies use progressive income tax systems.
- Tax bracket An income range with a single tax rate applied to it. The 22% bracket for a single 2024 filer runs from $47,150 to $100,525; income inside that range is taxed at 22%.
- Taxable income Gross income minus the standard deduction (or itemized deductions) and any other adjustments. The brackets are applied to taxable income, not to gross. Lesson 3 develops this distinction in detail.
- Marginal rate The rate of the top bracket your taxable income reaches. Determines how much tax you'd owe on the next dollar earned (or save, by deferring it into a 401(k)).
- Effective rate Total tax owed divided by total taxable income, expressed as a percent. Always lower than the marginal rate in a progressive system. The effective rate is the "true" rate at which you're paying tax.
Computing tax on $60,000 taxable income.
"A single filer reports $60,000 in taxable income for the year. Using the 2024 brackets (10% to $11,600; 12% to $47,150; 22% to $100,525), compute the total federal income tax owed, the marginal rate, and the effective rate."
Identify which brackets are touched.
$60,000 is between $47,150 and $100,525, so the income reaches into the 22% bracket. All three lower-or-equal brackets are touched: 10%, 12%, and 22%.
→ top bracket = 22%Compute the tax on the 10% bracket.
The 10% bracket runs from $0 to $11,600, a slice of width $11,600:
Compute the tax on the 12% bracket.
The 12% bracket runs from $11,600 to $47,150, a slice of width 47,150 − 11,600 = 35,550:
Compute the tax on the partial 22% bracket.
The 22% bracket runs from $47,150 upward, but our income only reaches $60,000. So the relevant slice is 60,000 − 47,150 = 12,850 (partial bracket):
Sum the three pieces.
Read the marginal and effective rates.
Marginal rate = 22% (the top bracket the income reaches). Effective rate = total tax / total income:
The taxpayer's headline rate ("I'm in the 22% bracket") and their actual rate of taxation (13.76%) are very different numbers. The effective rate is what you actually paid; the marginal rate is what the next dollar would cost.
→ effective < marginal, alwaysThree incomes. Stair-step each.
A single filer reports $40,000 in taxable income. What is the total federal income tax owed? (Brackets: 10% to $11,600; 12% to $47,150.)
Using the brackets above (10% to $11,600; 12% to $47,150; 22% to $100,525), what is the marginal rate for a single filer with $75,000 in taxable income?
From the worked example: a single filer with $60,000 taxable income owes $8,253 in federal income tax. What is the effective rate, rounded to one decimal place?
Three fast questions before you move on.
Q1. True or false: if you get a raise that pushes you into a higher tax bracket, all of your income is taxed at the new higher rate.
Q2. Which statement about the marginal and effective rates in a progressive system is always true?
Q3. A single filer has $30,000 in taxable income. Using the brackets (10% to $11,600; 12% to $47,150), what is the total federal income tax owed?
Two rates, two questions.
The two rates — marginal and effective — answer different practical questions. The marginal rate is what matters when you're deciding whether to take a side gig, negotiate a raise, or contribute another dollar to a tax-deferred 401(k); it tells you how the next dollar will be taxed. The effective rate is what matters for understanding your overall tax burden — it tells you, on average, what fraction of every dollar of taxable income actually went to federal tax.
State income tax (in most states) layers on top of the federal calculation, often with its own progressive bracket structure. FICA (7.65% from Lesson 1) is flat up to the Social Security wage cap. Combining federal + state + FICA, the total marginal rate for a typical middle-class earner is often in the 25%-35% range — the cumulative tax cost of the next dollar earned.
Next: Lesson 3 closes the income-tax half of the topic by reconciling the year-end totals: total tax owed (from this lesson) versus total withholding (from Lesson 1), settling up on whether you owe more or get a refund.
Continue to Lesson 03Different angle? Need another rep? These are optional — tap any that look helpful.