How Federal Tax Brackets and Rates Work

You’ve probably heard of terms like "tax bracket," "marginal tax rate" and "effective tax rate" — but what do they actually mean, and why do they matter? Below, we’ll break down how each concept works. Understanding the difference can help you better estimate what you’ll owe (and understand how to owe less in the future).

First, what is taxable income?

When it comes to determining your bill, the IRS uses your taxable income as the starting point for its calculations. Simply put, it's your gross income minus certain adjustments and deductions.

Gross income includes money you earn from all sources — that can mean your salary, freelance income, interest from a high-yield savings account and even capital gains you make from selling investments.

From there, you subtract any adjustments and deductions you're eligible for. These can include pretax contributions to a 401(k) or an IRA, as well as either the standard deduction or itemized deductions. The amount left over is your taxable income.

What are income tax brackets?

The federal government calculates your tax bill by first dividing your income into different taxable chunks called brackets. The income in each chunk is taxed at a different rate, ranging from 10% to 37%.

The beauty of tax brackets is that no matter which bracket(s) you’re in, you generally won’t pay a single tax rate on your entire income. The first portion of your income is always taxed at the lowest rate, and as your income increases, more of your money starts to spill over into higher-tiered tax brackets to be taxed at higher rates. This type of system is known as progressive taxation.

For example, if you had $50,000 of taxable income in 2025 as a single filer, you'll pay a 10% tax on that first $11,925 and a 12% tax on the chunk of income between $11,926 and $48,475. Then, you'll pay a 22% tax on the rest because some of your $50,000 of taxable income falls into the 22% tax bracket.

What is a marginal tax rate?

You may sometimes hear someone say that they are "in the 22% tax bracket." That doesn't mean that they pay a 22% tax on their entire income but rather that 22% is the highest tax rate they pay on the last dollar of their taxable income. It typically equates to their highest tax bracket.

In the example above, this single filer's marginal tax rate is 22%. If their taxable income went up by $1, they would pay 22% on that extra dollar, too. Knowing your marginal tax rate can be helpful because it can help with tax planning, whether that's determining the impact of a bonus or the tax effects of locking in a capital gain.

What is an effective tax rate?

Your effective tax rate is the percentage of your taxable income that you actually pay in taxes — in other words, it's your average tax rate. Knowing your effective tax rate is helpful because it can give you a clearer picture of how much of your income goes toward federal income taxes overall.

To determine your effective tax rate, grab your tax return and then divide your total tax owed (line 24) on Form 1040 by your total taxable income (line 15).

In the example above, the single filer's total tax bill is roughly $5,914, or about 12% of their income. This makes their effective tax rate 12%.

» Want to see your marginal and effective tax rates? Use our free tax calculator

How do state tax brackets and rates work?

Now that you have a grasp on federal taxes, you might be wondering how your state handles taxing income. The answer? It depends.

Each state approaches it differently — for example, some have a progressive system similar to the federal government, where people pay different rates on different portions of their income; other states might use what's known as a flat tax, where everyone pays the same rate on the entirety of their income, regardless of whether they made $500 or $500,000. There are also a small handful of states, such as Wyoming, that don't have a state income tax at all.

» Dive deeper: See state-by-state income tax rates and brackets

How often do tax brackets change?

After an annual performance review at your job, you might receive a cost-of-living raise. This helps to ensure that your salary (in other words, your purchasing power) is keeping up with the current cost of living.

Tax brackets work in a similar way. Each year, the IRS updates income thresholds through a process known as inflation adjustments. These small tweaks can help to prevent “bracket creep,” which can happen when rising wages push someone into a higher tax bracket even though their purchasing power hasn’t increased. Inflation adjustments can also reduce taxes for people whose pay hasn’t kept pace with inflation.

How to lower your tax bill

Since taxes are paid as you earn money, ideally, you are withholding enough tax throughout the year via your W-4 or estimated tax payments to cover what you owe. An overpayment in tax throughout the year will result in a refund, while an underpayment may result in a bill.

Still, two common ways of reducing your tax bill are credits and deductions.

• Tax credits can reduce your tax bill on a dollar-for-dollar basis; they don't affect what bracket you're in.

• Tax deductions, on the other hand, reduce how much of your income is subject to taxes. Generally, deductions lower your taxable income by your highest federal tax rate. So, if you fall into the 22% tax bracket, a $1,000 deduction could save you $220.

In other words, take all the tax deductions you can claim. Deductions can reduce your taxable income and could kick you to a lower bracket, which means you pay a lower tax rate.

Tax planning can also help you strategize how to owe less next year. One of the easiest ways to lower your tax bill is by contributing to a 401(k) if you have one. Contributions are subtracted from your taxable income, reducing the taxes you owe now while helping you save for retirement.

Some employers also offer tax-advantaged programs like flexible spending accounts and dependent care accounts. These let you use pretax dollars to pay for qualifying expenses while further lowering your taxable income and potentially reducing your tax bill.

» Dive deeper: 7 tax strategies for 2026