Your marginal tax rate is the percentage of tax you pay on your last dollar of income, not on all your income

The United States uses a progressive tax system, which means your income is taxed in layers. As you earn more, each new dollar enters a higher tax bracket and gets taxed at a higher rate. Your marginal rate is what you pay on that highest layer — the money you earned most recently. It is not the average rate you pay on everything you make.

For example, if you are single and earned $50,000 in 2024, you do not pay the same tax rate on all $50,000. Instead, the first portion is taxed at 10%, the next portion at 12%, and so on, until the last dollars you earned are taxed at your marginal rate. This is different from your effective tax rate, which is the average rate across all your income.

Understanding your marginal rate matters because it tells you what happens to your money when you earn more. If you are offered a raise, a bonus, or a second job, your marginal rate shows you how much of that new income will go to federal taxes before you see it.

Key Takeaways

  • Your marginal rate is the tax percentage on your highest layer of income, not an average across all your earnings.
  • The U.S. tax system has seven federal brackets in 2024, ranging from 10% to 37%, and your marginal rate depends on your total income and filing status.
  • Your marginal rate changes as your income changes, so earning more money moves you into a higher bracket only on the additional income, not retroactively on what you already earned.
  • Knowing your marginal rate helps you understand how much of a raise, bonus, or side income will actually reach your bank account after federal taxes.

How tax brackets work in practice

The IRS divides income into brackets, and each bracket has its own tax rate. In 2024, the federal brackets for single filers are 10%, 12%, 22%, 24%, 32%, 35%, and 37%. The income ranges for each bracket change every year based on inflation.

Here is a concrete example. If you are single and your taxable income in 2024 is $50,000, the first $11,600 is taxed at 10%, the next $47,150 (up to $58,750) is taxed at 12%, and so on. Your marginal rate is 12% because that is the rate applied to your last dollar. But your effective rate — the total tax you owe divided by your total income — is lower, around 9.5%.

The brackets are different if you file as married filing jointly, head of household, or married filing separately. A married couple filing jointly has wider brackets, so they can earn more before hitting a higher marginal rate than a single filer with the same income would face.

Why your marginal rate matters when you earn more

When you get a raise or take on extra work, only the new income is taxed at your marginal rate. The income you already earned stays in its original brackets and is not re-taxed at a higher rate. This is a common misconception: people sometimes think a raise will push all their income into a higher bracket, but that is not how it works.

If you earn an extra $5,000 and your marginal rate is 22%, you will owe roughly $1,100 in federal income tax on that $5,000 (before accounting for other factors like deductions or credits). The other $3,900 goes to you. Knowing this helps you decide whether a job offer, side work, or overtime is worth your time.

Your marginal rate also affects decisions about deductions and retirement contributions. A $5,000 contribution to a traditional 401(k) or IRA reduces your taxable income by $5,000, which saves you money at your marginal rate — in this case, $1,100. The higher your marginal rate, the more you save by reducing your taxable income.

How to find your marginal tax bracket

To find your marginal rate, you need to know your taxable income and your filing status. Taxable income is your gross income minus deductions (either the standard deduction or itemized deductions). Once you have that number, you look it up in the IRS tax bracket table for your filing status.

The IRS publishes new bracket tables every year, usually in late 2023 for the following tax year. You can find them on IRS.gov or on the website of any major tax software company. The brackets change to account for inflation, so your marginal rate may shift from year to year even if your income stays the same.

If you use tax software or file with a tax preparer, they will calculate your marginal rate for you. But knowing how to find it yourself helps you understand your tax situation and plan for changes in income.

Marginal rate versus effective rate

Your effective tax rate is your total federal income tax divided by your total taxable income. It is always lower than your marginal rate because it averages the tax you paid across all your income, including the portions taxed at lower rates.

Using the earlier example: if you earned $50,000 and owed about $4,750 in federal income tax, your effective rate is roughly 9.5%. Your marginal rate is 12%. The difference matters because your effective rate shows what percentage of your total income went to taxes, while your marginal rate shows what percentage of your next dollar will go to taxes.

When people talk about "tax brackets," they often mean marginal brackets. When they talk about "how much tax I pay," they usually mean effective rate. Both numbers are useful, but they answer different questions.

State and local taxes have their own marginal rates

Federal income tax is not the only tax with brackets. Most states that have income tax also use a progressive system with their own brackets and marginal rates. Some states have a flat tax rate instead, which means everyone pays the same percentage regardless of income.

Your total marginal rate for income tax purposes includes both federal and state (if applicable). If your federal marginal rate is 22% and your state marginal rate is 5%, your combined marginal rate is 27%. This combined rate is what you should think about when deciding whether a raise is worth it or how much a deduction saves you.

A few states have no income tax at all, so residents in those states only have a federal marginal rate to consider. The state you live in can make a significant difference in your total tax burden.

Frequently Asked Questions

Does earning more money push all my income into a higher tax bracket?

No. Only the new income is taxed at the higher rate. The income you already earned stays in its original brackets. If you earn $50,000 and then get a $10,000 raise, the first $50,000 is taxed the same way it always was. Only the new $10,000 is taxed at your new marginal rate.

How do I know what my marginal tax rate is right now?

Look up your taxable income on the IRS tax bracket table for your filing status. Your taxable income is your gross income minus deductions. Find the bracket your income falls into, and that bracket's rate is your marginal rate. The IRS publishes new tables every year on IRS.gov.

Why do people care about marginal rate instead of just looking at their total tax bill?

Your marginal rate tells you what happens to money you earn in the future. If you are deciding whether to take a second job or negotiate a raise, your marginal rate shows you how much of that new income will go to federal taxes. Your total tax bill tells you what you owed last year, but it does not predict what a change in income will cost you.

Can my marginal rate change during the year?

Your marginal rate can change if your income changes significantly during the year. It can also change on January 1 when the IRS adjusts brackets for inflation. But for most people, their marginal rate stays the same throughout the year because their income is fairly stable.

Is my marginal rate the same as my tax rate?

No. Your marginal rate is the rate on your last dollar of income. Your effective rate is your total tax divided by your total income. Your marginal rate is always higher than your effective rate because it does not include the lower-taxed portions of your income.