How Do Tax Brackets Work? US Federal Income Tax Explained

What Are Tax Brackets?

Tax brackets are income ranges, each taxed at its own rate. The United States uses a progressive income tax, which means the rate rises as income rises. But the higher rate applies only to the income that falls inside the higher bracket, never to the dollars below it.

Think of your taxable income as water filling a row of buckets. The first bucket fills at 10%, the next at 12%, and so on. Once a bucket is full, the rest spills into the next one, and only that spill is taxed at the next rate.

This is the single most misunderstood idea in personal finance. Many people believe that moving into a higher bracket means all of their income is suddenly taxed at the higher rate. It does not, and understanding why can change how you think about raises, overtime and side income.

The 2026 Federal Tax Brackets

The Internal Revenue Service (IRS) adjusts the brackets for inflation every year. For tax year 2026, the returns most people file in early 2027, the rates and thresholds below apply.¹² Each figure is the taxable income at which that rate starts.

Heads of household and married people filing separately have their own thresholds, listed in the IRS revenue procedure.² The IRS usually publishes the next year’s figures each fall. At the time of writing it had not yet published the 2027 brackets.⁴

How Tax Brackets Work, Step by Step

Working out your federal income tax takes four steps. The brackets only come in at step three, which is why they apply to taxable income rather than to your salary.

1. Add up your income. Wages, self-employment profit, interest and most other income count.
2. Subtract deductions. Most people take the standard deduction, which is $16,100 for single filers and $32,200 for married couples filing jointly in 2026.¹ What is left is your taxable income.
3. Apply the brackets. Tax each slice of taxable income at its own rate and add the slices together.
4. Subtract credits. Tax credits reduce the tax itself, dollar for dollar.

A Worked Example: A $75,000 Salary

Take a single filer earning $75,000 in wages in 2026, with no other income. This is an illustration to show the method, so it leaves out credits and other deductions.

First, subtract the $16,100 standard deduction. That leaves $58,900 of taxable income. Now fill the buckets in order.

The total federal income tax is $7,670. This person is “in the 22% bracket”, yet only $8,500 of their income is taxed at 22%. Their tax works out to about 13% of taxable income and about 10.2% of their whole salary.

The same method for a married couple

A married couple filing jointly with $150,000 of wages subtracts the $32,200 standard deduction, leaving $117,800 of taxable income. They pay 10% on the first $24,800 ($2,480), 12% on the next $76,000 ($9,120) and 22% on the last $17,000 ($3,740). That is $15,340 in total, again about 10.2% of their wages.

Marginal Tax Rate vs Effective Tax Rate

Your marginal rate is the rate on your next dollar; your effective rate is the average across all of them. Both numbers are useful, but for different decisions.

• Marginal tax rate. This is your top bracket. In the example above it is 22%. Use it to judge the tax on extra income, such as a bonus, or the saving from a deduction.
• Effective tax rate. This is your total income tax divided by your income. In the example it is about 10.2% of salary. Use it to understand how much of your pay really goes in federal income tax.

Mixing the two up leads to bad decisions. Someone who thinks they pay 22% on everything may turn down overtime or misjudge how much a retirement contribution saves. In reality, their overall rate is less than half of that.

Why a Raise Never Lowers Your Take-Home Pay

Crossing into a higher bracket only affects the dollars above the line. Suppose the single filer in our example gets a $1,000 raise. That extra $1,000 falls in the 22% bracket, so their federal income tax rises by $220.

They also pay payroll taxes on the raise, covered below, but they still keep most of the extra money. There is no point at which earning one more dollar makes you worse off because of the income tax brackets themselves. The fear of “moving into a higher bracket” is based on a misunderstanding.

There are a few real cliffs elsewhere in the tax system. Some credits and benefits shrink or disappear as income rises. Those are separate rules, not the brackets, and they are worth checking if your income is close to a benefit limit.

Deductions vs Credits: What Changes Your Bill

A deduction lowers your taxable income; a credit lowers your tax directly. That difference makes credits much more valuable, dollar for dollar.

A $1,000 deduction for someone in the 22% bracket saves $220, because it removes $1,000 from the top slice of their income. A $1,000 tax credit saves the full $1,000, whatever bracket they are in. When you hear about a new tax break, the first question to ask is which of the two it is.

Most filers take the standard deduction rather than listing individual deductions, known as itemizing. Itemizing only helps when your eligible expenses, such as mortgage interest or charitable gifts, add up to more than the standard deduction.

Filing Status Changes Your Brackets

The same income can be taxed differently depending on how you file. Your filing status sets both your brackets and your standard deduction.

The main statuses are single, married filing jointly, married filing separately and head of household. For most income levels, the joint brackets are about twice as wide as the single ones, so a married couple with one main earner often pays less than two single people with the same total income. Head of household, for unmarried people who support a qualifying dependent, has wider brackets and a larger standard deduction than single status: $24,150 in 2026.¹

Payroll Taxes Are Separate From the Brackets

Your paycheck also funds Social Security and Medicare, outside the income tax brackets. These payroll taxes apply to wages from the first dollar, with no standard deduction.

• Social Security: employees pay 6.2% of wages up to $184,500 in 2026.³ Earnings above that limit are not taxed for Social Security.
• Medicare: employees pay 1.45% of all wages, with no upper limit.³

Employers pay a matching share, and self-employed people pay both halves. For most workers, payroll taxes add 7.65% on top of federal income tax. That is why a $1,000 raise in the 22% bracket typically costs about $296.50 in federal taxes, not $220.

Why Brackets Rise Every Year

The thresholds are adjusted for inflation so that rising prices alone do not push people into higher brackets. Without this, a raise that only keeps up with the cost of living would be taxed at higher rates, even though you are no better off. That effect is known as bracket creep.

Each fall the IRS publishes the new thresholds, the standard deduction and dozens of other figures for the coming tax year.²⁴ If you budget for taxes, check the new numbers once they are out. Our explainer on inflation covers why prices rise in the first place.

State and Local Income Taxes

The brackets in this article are federal only. Most states also tax income, some with a single flat rate and others with their own set of brackets. A few states have no tax on wages at all, and some cities add a local income tax.

The same principle applies wherever brackets are used: each rate applies only to the income inside its range. Check your state revenue department for the current figures where you live.

Common Myths About Tax Brackets

Most confusion about tax brackets comes from a handful of persistent myths.

• “A raise could cost me money.” Not because of the brackets. Only the extra income is taxed at the higher rate.
• “I pay my bracket rate on everything.” No. Your effective rate is always lower than your top rate.
• “A refund means I paid less tax.” A refund means too much was withheld during the year. Your actual tax is the same either way.
• “Deductions and credits are the same.” A credit cuts your tax dollar for dollar; a deduction only cuts the income that is taxed.

How to Use Tax Brackets in Everyday Decisions

Knowing your marginal rate turns tax questions into simple arithmetic. Multiply any change in taxable income by your marginal rate to estimate the change in federal income tax.

• Retirement contributions. Money you put into a traditional 401(k) generally lowers your taxable income now, so in the 22% bracket each $1,000 contributed cuts this year’s federal income tax by about $220.
• Side income. Set aside your marginal rate plus self-employment tax from freelance earnings, so a tax bill does not surprise you.
• Bonuses. Bonuses are taxed as ordinary income, even if withholding on them looks high. Any over-withholding comes back when you file.

For bigger decisions, especially near a bracket boundary or a benefit limit, a tax professional or the IRS’s own guidance is worth checking. To see how money you save could grow over time, read about compound interest and index funds.

How Withholding Connects to Your Brackets

Your employer takes tax from each paycheck based on an estimate of your yearly bill. That estimate comes from the Form W-4 you fill in when you start a job. It uses the same brackets, spread across the pay periods in the year.

When you file your return, the actual tax is worked out on your real income for the whole year. If more was withheld than you owe, you get a refund. If less was withheld, you pay the difference.

Withholding can drift away from your real bill when your life changes. A second job, a working spouse, a large bonus or freelance income can all leave you under-withheld. Updating your W-4 after a big change helps avoid a surprise in April.

Investment Income Has Its Own Rules

Not every dollar of income runs through the ordinary brackets in the same way. Interest from a savings account is generally taxed as ordinary income, so it is stacked on top of your wages and taxed at your marginal rate.

Qualified dividends and long-term capital gains, from investments held for more than a year, use a separate and usually lower set of rates. Those rates still depend on your taxable income, so your wages affect how your investment income is taxed. Money held in retirement accounts such as a 401(k) or an IRA follows yet another set of rules.

The practical lesson is that where you hold an investment can matter as much as what you hold. Our explainer on index funds covers low-cost investing basics.

Planning Around Bracket Boundaries

Because the brackets are progressive, timing income and deductions can make a modest difference. The idea is simple: try to receive income in years when your marginal rate is lower, and claim deductions in years when it is higher.

For example, someone expecting a much lower income next year, perhaps because they are retiring or taking time off, may save tax by delaying a bonus or freelance invoice into that year, if their employer or client agrees. Someone close to the top of a bracket can see exactly how much room is left before the next rate starts. Our worked example shows the method: subtract the standard deduction, then compare your taxable income with the thresholds in the table above.

These are small adjustments rather than tricks, and they only help when your income really does change between years. They never make earning more a bad idea.

Key Terms Explained

• Taxable income: income after deductions, the amount the brackets apply to.
• Standard deduction: a fixed amount you can subtract instead of itemizing; $16,100 for single filers in 2026.
• Marginal tax rate: the rate on your next dollar of taxable income, equal to your top bracket.
• Effective tax rate: total income tax divided by income.
• Tax credit: an amount subtracted directly from your tax bill.
• Bracket creep: being pushed into higher brackets by inflation alone, which annual adjustments are designed to prevent.

The Bottom Line

Tax brackets tax your income in slices, and each slice keeps its own rate. Moving into a higher bracket only affects the dollars above the threshold, so earning more always leaves you with more. Know your marginal rate for decisions about extra income, and your effective rate for understanding what you really pay. For more on managing money, browse our money explainers.

Your tax bracket also shapes retirement choices. Our explainer on Roth IRAs covers paying tax now to withdraw tax-free later.

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