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

The U.S. tax system uses tax brackets. Each bracket covers a range of income and has its own rate. As your income rises, you move into higher brackets. Your marginal tax rate is the rate that applies to your highest bracket — the one your next dollar of income will fall into.

This matters because many tax decisions turn on what you'll actually pay, not what you've already paid. When you decide whether to take a bonus, defer income to next year, or claim a deduction, you're really asking: what will this cost me at my marginal rate? The answer is almost never your overall tax rate.

For example, if you're single and earned $50,000 in 2024, your marginal rate is 22 percent. That doesn't mean you pay 22 percent on all $50,000. You pay 10 percent on the first portion, 12 percent on the next portion, and 22 percent only on the income above $47,150. Your overall rate — what accountants call your effective tax rate — is lower than 22 percent.

Key Takeaways

  • Your marginal rate is the tax rate on your next dollar of income, determined by which bracket your income falls into.
  • Your effective rate (total tax divided by total income) is always lower than your marginal rate because lower brackets explore to your first dollars earned.
  • Tax decisions like taking a bonus, harvesting losses, or bunching deductions should be evaluated at your marginal rate, not your effective rate.
  • Your marginal rate changes each year as tax brackets adjust for inflation, and it changes if your income crosses into a new bracket.
  • State and local taxes, Medicare taxes, and investment income can push your true marginal rate higher than the federal bracket rate alone.

How tax brackets create your marginal rate

The IRS publishes tax brackets each year. For 2024, the federal brackets for single filers are 10%, 12%, 22%, 24%, 32%, 35%, and 37%. Each bracket applies to a specific income range. The 22% bracket, for instance, covers income from $47,151 to $100,525 for single filers in 2024.

When you earn income, it fills up the brackets from the bottom. Your first dollars are taxed at 10%, the next batch at 12%, and so on, until all your income is assigned to a bracket. The bracket your last dollar lands in is your marginal bracket, and the rate for that bracket is your marginal rate.

If you're married filing jointly, the brackets are wider but the principle is identical. A couple earning $100,000 in 2024 has a marginal rate of 12%, because their income falls within the 12% bracket for joint filers (which runs from $23,201 to $94,300). A couple earning $150,000 has a marginal rate of 22%.

Why marginal rate matters more than effective rate for decisions

Suppose you're offered a $5,000 bonus and you're in the 24% bracket. You might think: "I'll pay 24% tax on that, so I'll net $3,800." That's correct. But if someone tells you "your tax rate is 18%," and you use that number, you'll overestimate what you keep. Your effective rate is what you've already paid on all your income so far — it's backward-looking. Your marginal rate is what you'll pay on new income — it's forward-looking.

The same logic applies to deductions. If you're considering whether to bunch charitable donations into one year to exceed the standard deduction, you need to know your marginal rate. A $10,000 deduction saves you $2,400 in tax if you're in the 24% bracket, but only $2,200 if you're in the 22% bracket. The difference is real money, and it depends on your marginal rate, not your effective rate.

Tax-loss harvesting — selling an investment at a loss to offset gains — is another example. The value of that loss depends on your marginal rate. If you're in the 32% bracket, a $5,000 loss saves you $1,600. In the 24% bracket, it saves you $1,200. Same loss, different value.

How to find your marginal rate

Start with your taxable income for the year. This is your total income minus the standard deduction (or itemized deductions, if you use those instead). Then find the tax bracket table for your filing status — single, married filing jointly, head of household, or married filing separately. The bracket your taxable income falls into is your marginal bracket.

The IRS publishes updated brackets each January on its website. Tax software and most tax preparation websites also display them. If you're in the middle of the year and trying to forecast, use your year-to-date income and estimate the rest, then find the bracket your projected total will fall into.

Remember that brackets shift each year for inflation. The 22% bracket in 2024 covers different income ranges than it did in 2023. If your income is stable, your marginal rate might stay the same year to year, or it might creep into a higher bracket as inflation pushes the brackets up.

Your true marginal rate includes state, local, and other taxes

The federal bracket is only part of the story. If you live in a state with income tax, that tax also has brackets and rates. New York, California, and Massachusetts have top state rates above 10%. Some cities, including New York City and Columbus, Ohio, also tax income.

When you're making a decision about income or deductions, your true marginal rate is the federal rate plus the state rate plus any local rate. If you're in the 24% federal bracket and the 6.5% New York state bracket, your marginal rate is 30.5%. That's the real cost of the next dollar you earn.

Self-employed people and high earners should also account for the 3.8% Net Investment Income Tax and the 0.9% Additional Medicare Tax, both of which phase in at higher income levels. These are not part of the bracket system, but they do increase your marginal rate on certain types of income.

How your marginal rate changes your tax strategy

Knowing your marginal rate lets you make smarter decisions about timing and bunching. If you're in the 22% bracket and you can defer $10,000 of income to next year, you save $2,200 in federal tax (plus state and local). If deferring would push you into the 24% bracket, the math changes — you'd save less in the year you defer and owe more in the year you receive it.

The same applies to deductions. If you're close to the edge of a bracket, a large deduction might pull you down into a lower bracket, increasing its value. If you're solidly in the middle of a bracket, the deduction is worth exactly your marginal rate, no more.

Retirement account contributions are another example. A $7,000 contribution to a traditional IRA reduces your taxable income by $7,000. At the 22% marginal rate, that saves you $1,540 in federal tax. At the 32% rate, it saves you $2,240. The higher your marginal rate, the more valuable the deduction.

When your marginal rate might surprise you

Some tax rules create phase-outs or cliffs that effectively raise your marginal rate above the bracket rate. The child tax credit, for example, phases out at higher incomes. As your income rises past the threshold, you lose $50 of the credit for every $1,000 of income. That's an effective 5% tax on that income, on top of your bracket rate.

Roth conversion income can trigger the Medicare Income-Related Monthly Adjustment Amount (IRMAA), which raises your Medicare premiums. That's an invisible tax on conversion income for people over 65. The true cost of a conversion might be much higher than the bracket rate suggests.

If you're subject to the Alternative Minimum Tax (AMT), your marginal rate is determined by the AMT brackets, not the regular brackets. This is rare for most people but common for high earners and those with large deductions.

Frequently Asked Questions

Is my marginal rate the same as my tax bracket?

Yes. Your tax bracket is the range of income you fall into; your marginal rate is the percentage rate for that bracket. If you're in the 24% bracket, your marginal rate is 24%.

Why do people say the U.S. has a progressive tax system?

Because higher earners pay a higher marginal rate on their income. Someone earning $500,000 is in the 37% bracket; someone earning $50,000 is in the 22% bracket. The system is progressive because the rate increases as income increases.

If I get a raise that pushes me into a higher bracket, do I pay the higher rate on all my income?

No. You pay the higher rate only on the income that falls into the higher bracket. If a raise pushes you from the 22% bracket into the 24% bracket, only the income above the bracket threshold is taxed at 24%.

How do I know what my marginal rate will be next year?

Estimate your income for next year, then find the bracket it falls into using the current-year brackets (which the IRS will update in January). Your estimate won't be exact, but it's close enough for planning decisions like Roth conversions or charitable bunching.

Does my marginal rate affect how much I should contribute to a 401(k)?

Yes. A 401(k) contribution reduces your taxable income by the contribution amount, saving you tax at your marginal rate. The higher your marginal rate, the more valuable the contribution. Someone in the 37% bracket saves $3,700 on a $10,000 contribution; someone in the 22% bracket saves $2,200.