Most paychecks are subject to federal income tax, but the amount withheld depends on your income level, filing status, and what you claim on Form W-4
Whether your paycheck gets taxed comes down to two things: whether you owe federal income tax at all, and whether your employer is required to withhold it. Most full-time workers do owe federal income tax and have it taken out of each paycheck. But some people — usually those with very low income — don't owe any federal income tax, and their paychecks won't be touched. The IRS publishes income thresholds each year that determine who falls into which category.
Your employer learns what to withhold from the Form W-4 you fill out when you're hired. This form tells your employer your filing status (single, married, head of household), how many dependents you claim, and whether you have other income. Your employer then uses IRS withholding tables to calculate how much federal tax to remove from each paycheck. If you don't fill out a W-4, your employer must withhold as if you're single with no dependents — which usually means more money comes out than necessary.
Key Takeaways
- Federal income tax withholding is based on your W-4 form, which you provide to your employer when hired or can update anytime.
- If your annual income falls below the IRS threshold for your filing status, you may not owe federal income tax and can request zero withholding.
- Changing your W-4 takes effect on your next paycheck, so you don't have to wait until next year to adjust how much is withheld.
- The amount withheld is an estimate; you settle the actual amount owed when you file your tax return, and you may get a refund or owe more.
Income thresholds that determine whether you owe federal income tax
The IRS sets a minimum income level — called the standard deduction — below which you don't owe federal income tax. This threshold changes each year and depends on your filing status. For 2024, a single person under 65 doesn't owe federal income tax if their income is below $14,600. A married couple filing jointly doesn't owe if their combined income is below $29,200. These numbers are higher if you're 65 or older, and they're different if you're head of household or married filing separately.
If your income falls below your threshold, you still may have federal tax withheld from your paychecks — but you don't actually owe it. When you file your tax return, you'll get that money back as a refund. To stop the withholding in the first place, you can fill out a new W-4 and claim exemption from withholding, though this only works if you truly expect to owe zero tax for the year.
Self-employed people and gig workers don't have an employer to withhold for them, so they need to make estimated tax payments directly to the IRS four times a year if they expect to owe more than $1,000 in federal income tax.
How your W-4 form controls what gets withheld
The Form W-4 is the document that tells your employer how much federal tax to remove from your paycheck. You fill it out when you start a job, and you can update it anytime — when you get married, have a child, take a second job, or if you simply want to change how much is withheld. The form asks for your name, address, filing status, number of dependents, and whether you have other income or jobs.
Each dependent you claim reduces the amount withheld, because dependents lower your taxable income. If you're married and both spouses work, you need to coordinate your W-4s so that together you're withholding the right amount — if you both claim "married" status without adjusting, you may under-withhold and owe money at tax time. The IRS provides a W-4 calculator on its website that walks you through the form and suggests how many dependents to claim based on your actual situation.
When you submit a new W-4 to your employer's payroll department, the change takes effect on your next paycheck. You don't have to wait until January or until the next tax year.
What happens if you withhold too much or too little
The amount withheld from your paychecks is an estimate, not your final tax bill. When you file your tax return — usually by April 15 of the following year — you report your actual income and calculate what you truly owe. The IRS then compares what you withheld to what you owe.
If you withheld more than you owe, you get a refund. If you withheld less, you owe the difference. Most people end up with a refund because they over-withhold, either by accident or on purpose (some people treat it as forced savings). If you consistently get a large refund, you can adjust your W-4 to withhold less and take home more money each paycheck instead.
If you under-withhold significantly and owe a large amount at tax time, you may also owe a penalty for under-withholding, though the IRS waives this if you had a good reason (like a major life change mid-year) or if you paid at least 90 percent of your current year's tax through withholding.
Special situations that affect withholding
If you have a second job or side income, your first employer's withholding may not account for the extra income, and you could end up owing money. The IRS allows you to claim additional withholding on your W-4 — you can tell your employer to take out extra money each paycheck to cover the second job. Alternatively, you can use the W-4 calculator and enter all your income sources to get an accurate withholding amount.
If you're married and both spouses work, each employer withholds based on the assumption that only one person in the household is earning income. This often results in under-withholding. You can fix this by having one spouse claim all the dependents on their W-4 and the other claim none, or by requesting additional withholding on one or both W-4s.
Certain types of income — like tips, bonuses, commissions, and gambling winnings — may be subject to different withholding rules. Tips are usually withheld at the same rate as regular wages, but bonuses and commissions sometimes have a flat 22 percent withheld (or 37 percent if the bonus is over $1 million). Gambling winnings have 24 percent withheld at the source.
How to request zero withholding or change your withholding
To stop federal income tax from being withheld, you fill out a new Form W-4 and claim exemption from withholding. You can only do this if you expect to owe zero federal income tax for the year — meaning your income will be below the standard deduction for your filing status. If you claim exemption but then earn more than expected, you'll owe the full amount at tax time with no withholding to cover it.
To increase or decrease withholding without claiming full exemption, you can claim a different number of dependents or request additional withholding. If you want to withhold less, claim more dependents (up to the number you actually have). If you want to withhold more, claim fewer dependents or request a specific dollar amount in additional withholding each paycheck.
Submit your new W-4 to your employer's human resources or payroll department. Keep a copy for your records. The change takes effect on your next paycheck, usually within one or two pay periods.
Frequently Asked Questions
Can I claim exemption from withholding if I'm a dependent on my parents' tax return?
No. If your parents claim you as a dependent, you cannot claim exemption from withholding, even if your own income is below the standard deduction. Your employer must withhold federal income tax from your paychecks. You'll get the money back when you file your tax return.
What if I don't fill out a W-4 when I start a job?
Your employer must withhold federal income tax as if you're single with no dependents and no other income. This usually results in more tax being withheld than necessary. Fill out a W-4 as soon as possible to adjust the withholding to match your actual situation.
Do I have to update my W-4 every year?
No, but you should update it when your life changes — marriage, divorce, new dependents, second job, or significant income change. The IRS also recommends reviewing your W-4 annually to make sure you're still withholding the right amount, especially if tax laws have changed.
Will I get a refund if I had too much withheld?
Yes. When you file your tax return, the IRS compares what you withheld to what you actually owe. If you withheld more, you'll receive a refund. Most refunds arrive within 21 days of the IRS processing your return, though it can take longer if you claim certain credits.
Are state income taxes withheld the same way as federal?
No. State income tax withholding is separate and depends on your state's rules. Some states don't have income tax at all. You fill out a state W-4 (or equivalent form) with your state employer, and the amount withheld is based on state tax rates and thresholds, not federal ones.