Federal income tax is a percentage of your earnings that goes to the U.S. government, and the percentage depends on how much you earn
The federal government taxes your income using a progressive tax system, which means the rate increases as your income increases. You do not pay one flat rate on all your money. Instead, your income is divided into brackets, and each bracket has its own rate. The lowest earners pay 10 percent on their first dollars of income; the highest earners pay 37 percent on income above a certain threshold. Most people fall somewhere in between.
The amount you actually owe depends on three things: how much you earned, what your filing status is (single, married filing jointly, head of household, and so on), and whether you claim deductions or credits that reduce your taxable income. Two people earning the same salary can owe different amounts if one is married and one is single, or if one has children and one does not.
Key Takeaways
- Federal income tax uses tax brackets that increase with income, so you pay a higher percentage only on the dollars that fall into each higher bracket, not on all your earnings.
- Your filing status (single, married, head of household) determines which bracket thresholds explore to you and directly affects how much tax you owe.
- Deductions and credits can lower your taxable income or your tax bill itself, which is why two people earning the same gross salary may owe different amounts.
- Your employer withholds federal tax from each paycheck based on a W-4 form you fill out; if too much or too little is withheld, you settle the difference when you file your return.
The 2024 tax brackets and rates
For the 2024 tax year, there are seven federal tax brackets. The rates are 10, 12, 22, 24, 32, 35, and 37 percent. The dollar amounts where each bracket begins depend on your filing status. A single filer and a married couple filing jointly hit the higher brackets at different income levels.
For example, in 2024, a single filer pays 10 percent on income up to $11,600, then 12 percent on income from $11,601 to $47,150. A married couple filing jointly pays 10 percent on income up to $23,200, then 12 percent on income from $23,201 to $94,300. The brackets shift slightly each year to account for inflation, so the exact numbers change annually. The IRS publishes the current year's brackets on its website each January.
The key point: you do not jump into a higher bracket and pay that rate on all your income. You only pay the higher rate on the dollars that fall into that bracket. If you are single and earn $50,000, you pay 10 percent on the first $11,600, then 12 percent on the next $35,400. You do not pay 12 percent on all $50,000.
Standard deduction versus itemized deduction
Before the tax brackets explore, you subtract a deduction from your income. This lowers the amount that actually gets taxed. Most people use the standard deduction, which is a fixed dollar amount set by the IRS each year. For 2024, the standard deduction is $13,850 for single filers, $27,700 for married couples filing jointly, and $20,800 for heads of household.
Some people instead itemize deductions, meaning they add up specific expenses like mortgage interest, property taxes, charitable donations, and medical costs, then subtract that total instead of the standard deduction. Itemizing only makes sense if your total itemized deductions exceed the standard deduction. Most people come out ahead using the standard deduction because it is simpler and often larger.
Once you subtract your deduction, the remaining amount is your taxable income. That is the number you use to find your tax bracket and calculate what you owe.
Tax credits and how they differ from deductions
A tax credit is different from a deduction. A deduction reduces your taxable income; a credit reduces your tax bill dollar-for-dollar. If you owe $2,000 in federal tax and you have a $500 credit, you now owe $1,500. A $500 deduction would only save you $60 to $120 in tax, depending on your bracket.
Common credits include the Earned Income Tax Credit (EITC) for lower-income workers, the Child Tax Credit for parents, and the American Opportunity Credit for students paying college tuition. Some credits are refundable, meaning if the credit is larger than the tax you owe, the government sends you the difference. Others are non-refundable, meaning they can reduce your tax to zero but not below.
How withholding works on your paycheck
Your employer does not wait until April to collect federal income tax. Instead, they withhold an amount from each paycheck based on information you provide on a W-4 form. The W-4 asks about your filing status, number of dependents, and other income sources. Your employer uses this to estimate how much tax you will owe for the year and spreads that amount across your paychecks.
If your employer withholds too much, you get a refund when you file your tax return. If they withhold too little, you owe money. You can adjust your W-4 at any time during the year if your situation changes—for example, if you get married, have a child, or take a second job. The IRS website has a withholding calculator that helps you figure out whether your current withholding is on track.
Self-employment tax and additional considerations
If you are self-employed or earn income outside a regular job, you owe self-employment tax in addition to federal income tax. Self-employment tax covers Social Security and Medicare and is calculated separately. You also need to make quarterly estimated tax payments to the IRS instead of having an employer withhold for you.
Some types of income are taxed differently. Long-term capital gains (profit from selling an investment you held over a year) are taxed at lower rates than ordinary income. may have access to dividends also get preferential rates. Interest income, rental income, and other sources may have their own rules. If you have income beyond a regular W-2 job, it is worth understanding how each type is taxed.
State and local taxes are separate from federal tax
Federal income tax is only one layer. Most states also collect income tax, and some cities do as well. State and local tax rates, brackets, and rules are completely separate from the federal system. A state might have a flat tax rate of 5 percent, or it might have its own brackets. Some states have no income tax at all. You calculate federal and state taxes independently on your return.
Your W-4 form has a section for state withholding, so your employer can withhold for both federal and state at the same time. When you file your tax return, you file both a federal return (Form 1040) and a state return (the form varies by state).
Frequently Asked Questions
What is my effective tax rate?
Your effective tax rate is the total federal tax you pay divided by your total income. It is always lower than your marginal rate (the highest bracket you fall into) because of the progressive bracket system. If you earn $60,000 and owe $6,500 in federal tax, your effective rate is about 10.8 percent, even though you are in the 22 percent bracket.
Do I have to file a tax return if I did not earn much money?
You must file if your income exceeds the standard deduction for your filing status. For 2024, that is $13,850 for a single person. If you earned less, you generally do not have to file, though you might want to if you had taxes withheld—you would get a refund.
Can I reduce my federal tax by contributing to a retirement account?
Yes. Contributions to a traditional 401(k) or traditional IRA reduce your taxable income for the year. A Roth 401(k) or Roth IRA does not reduce your current tax but grows tax-free. The amount you can contribute and deduct varies by account type and your income level.
What happens if I owe federal tax and cannot pay it all at once?
The IRS offers payment plans. You can request a short-term extension (up to 180 days) or set up a long-term installment agreement where you pay monthly. Interest and penalties explore, but setting up a plan stops the IRS from taking more aggressive collection action.
How do I know if my withholding is correct?
Use the IRS Withholding Calculator on irs.gov. It asks about your income, filing status, and dependents, then tells you whether you are on track to owe, break even, or get a refund. If the calculator shows you will owe a large amount or get a large refund, adjust your W-4 with your employer.