Federal tax is money the U.S. government collects from workers and businesses to pay for national programs

Federal tax is a percentage of your income that goes directly to the U.S. government. Unlike state or local taxes, which fund schools, roads, and police in your area, federal tax pays for programs that serve the entire country—Social Security, Medicare, national defense, the FBI, and hundreds of other federal agencies.

The federal government collects federal income tax from your paycheck, your business profits, and your investments. If you work a regular job, your employer takes federal tax out automatically before you see your pay. If you're self-employed, you send payments to the Internal Revenue Service (IRS) yourself, usually four times a year.

The amount you owe depends on how much you earned and which tax bracket you fall into. Tax brackets are income ranges, and each range has its own tax rate. The more you earn, the higher your bracket—but only the income in that bracket is taxed at the higher rate.

Key Takeaways

  • Federal tax is collected by the IRS and funds national programs like Social Security, Medicare, and defense, not local services.
  • Your federal tax rate depends on your income bracket, and only the income within each bracket is taxed at that rate.
  • If you work for an employer, federal tax is withheld from your paycheck automatically; if you're self-employed, you pay the IRS directly.
  • You file a federal tax return each year to report your income and either pay what you owe or receive a refund if too much was withheld.
  • Federal tax rates change each year and vary based on your filing status (single, married, head of household) and whether you have dependents.

How federal income tax brackets work

The U.S. uses a progressive tax system, which means tax rates increase as your income increases. The government divides income into brackets, and each bracket has its own rate. For example, in 2024, a single filer might pay 10% on the first $11,600 of income, then 12% on income between $11,601 and $47,150, and so on.

A common mistake is thinking that moving into a higher bracket means all your income is taxed at that higher rate. That's not how it works. Only the income that falls within each bracket is taxed at that bracket's rate. If you earn $50,000 as a single filer, you don't pay 22% on all $50,000—you pay 10% on the first portion, 12% on the next portion, and 22% only on the portion that falls in the third bracket.

Tax brackets change every year because the IRS adjusts them for inflation. The IRS publishes new brackets in the fall for the following year, so the rates you pay in 2024 will be different from the rates in 2025.

Federal tax withholding from your paycheck

If you work for an employer, your company withholds federal tax from each paycheck based on information you provide on Form W-4. This form asks about your income, dependents, and other situations that affect how much tax you owe. Your employer sends the withheld money to the IRS on your behalf throughout the year.

The goal of withholding is to collect roughly the right amount of tax over the year so you don't owe a large bill or receive a huge refund when you file your return. If you change jobs, get married, have a child, or your income changes significantly, you should update your W-4 so your withholding stays accurate.

If too much tax is withheld, you'll receive a refund when you file your return. If too little is withheld, you'll owe money. Neither outcome is ideal—a refund means you gave the government an interest-free loan, and owing money means you may owe penalties if you didn't pay enough throughout the year.

Self-employment and federal tax payments

If you're self-employed or own a business, you don't have an employer to withhold federal tax for you. Instead, you make estimated tax payments to the IRS four times a year, usually in April, June, September, and January. These payments are based on how much profit you expect to make.

Self-employed people also pay self-employment tax, which covers Social Security and Medicare. Employees split this cost with their employer, but self-employed people pay both the employee and employer portions—currently 15.3% of your net profit (12.4% for Social Security and 2.9% for Medicare).

If you underestimate your income and don't pay enough in estimated taxes, you may owe penalties and interest when you file your return. If you overestimate, you'll receive a refund. Many self-employed people work with an accountant to calculate the right amount to pay each quarter.

Filing your federal tax return

Every year, you file a federal tax return with the IRS to report your total income and calculate how much tax you actually owe. The important date is usually April 15, though the IRS sometimes extends it. You can file on paper or electronically, and many people use tax software or hire a tax professional to prepare their return.

When you file, you report income from all sources—wages, self-employment, investments, rental property, and anything else. You also claim deductions and credits that reduce the amount of tax you owe. A deduction lowers your taxable income, while a credit directly reduces the tax you owe.

After you file, the IRS compares what you paid throughout the year (through withholding or estimated payments) to what you actually owe. If you paid too much, you get a refund. If you paid too little, you owe the difference plus any applicable penalties and interest.

Deductions and credits that lower your federal tax

The federal tax code offers deductions and credits to reduce what you owe. You can either take the standard deduction, a flat amount set by the IRS each year, or itemize deductions if your specific expenses add up to more than the standard amount.

For 2024, the standard deduction is $14,600 for single filers and $29,200 for married couples filing jointly. Common itemized deductions include mortgage interest, state and local taxes, charitable donations, and medical expenses above a certain threshold. Most people benefit from taking the standard deduction because it's simpler and often larger than their itemized deductions.

Tax credits are even more valuable because they reduce your tax dollar-for-dollar. The Earned Income Tax Credit (EITC) helps lower-income workers, the Child Tax Credit provides money for each dependent child, and the American Opportunity Credit helps with college costs. Unlike deductions, which only lower your taxable income, credits directly cut the amount of tax you owe.

Who pays federal tax and who doesn't

Not everyone has to file a federal tax return. The IRS sets income thresholds based on your age, filing status, and type of income. For 2024, a single person under 65 doesn't have to file if their income is below $14,600. If you're 65 or older, the threshold is higher. Married couples have different thresholds depending on whether both spouses are over 65.

Even if you don't have to file, you may want to. If federal tax was withheld from your paycheck or you made estimated payments, filing a return is the only way to get a refund. If you're may have access to to the Earned Income Tax Credit or other refundable credits, you must file to claim them.

Some types of income, like certain government benefits and gifts, aren't taxed at all. Interest from municipal bonds is also exempt from federal tax. Your tax situation determines what you report and what you don't.

Frequently Asked Questions

What's the difference between federal tax and state tax?

Federal tax goes to the U.S. government and funds national programs. State tax goes to your state and funds state-level programs. Some states have no income tax at all, while others tax income at rates ranging from 1% to over 13%. You may owe both federal and state tax depending on where you live and work.

Can I change my W-4 if I'm withholding too much?

Yes. You can submit a new W-4 to your employer at any time. If you're getting a large refund each year, you're having too much withheld—updating your W-4 puts more money in your paycheck instead of giving it to the government interest-free. Your employer will use the new W-4 starting with your next paycheck.

What happens if I don't pay federal tax?

The IRS will contact you and demand payment. If you don't respond, they can place a lien on your property, garnish your wages, or seize your bank account. You may also owe penalties and interest on top of the original tax. If you can't pay in full, the IRS offers payment plans and other options—contacting them early is better than ignoring the debt.

Do I have to file if I'm retired?

It depends on your income. If your income is below the threshold for your age and filing status, you don't have to file. However, if you received federal tax withholding from a pension or other income source, filing a return may get you a refund. Check the IRS income thresholds for your specific situation.

What's the difference between a tax refund and a tax credit?

A tax credit reduces the amount of tax you owe. A refundable credit can result in a refund if it's larger than your tax bill. A non-refundable credit can only reduce your tax to zero—you don't get money back if the credit is larger. A refund is money returned to you because you overpaid throughout the year.