What Are Payroll Exemptions and How Do They Work?

Payroll exemptions are the entries you make on IRS Form W-4 that tell your employer how much federal income tax to withhold from each paycheck. Set them well and your withholding lands close to what you actually owe at filing time, so you don’t get hit with a surprise bill in April or hand the government an interest-free loan all year. The W-4 only governs federal income tax; Social Security and Medicare come out at fixed rates no matter what you put on the form.

What the W-4 Controls

Form W-4, Employee’s Withholding Certificate, is the document you give your employer to set your federal income tax withholding.¹ Your employer feeds the numbers you provide into the withholding tables and formulas in IRS Publication 15-T to estimate your projected taxable income and apply the right marginal rate to each check.² Federal law under Internal Revenue Code Section 3402 requires employers to deduct and withhold income tax from wages using these prescribed methods.³

If you’ve been working for a while, you may remember claiming “allowances.” The IRS redesigned the W-4 starting in 2020, and the current form uses dollar amounts and specific inputs for dependents, other income, and deductions instead of a count of allowances.

One thing the W-4 does not change: FICA. The 6.2% Social Security tax and the 1.45% Medicare tax come out of every paycheck regardless of what you claim.⁴ You can’t exempt yourself from those through the W-4.

Filling Out the W-4

Most people complete Steps 1 and 5 (name, address, filing status, signature) and leave the rest blank. That default produces withholding based on the standard deduction for your filing status and nothing else. If your situation is more complicated than a single job with no dependents, you’ll want to use the middle steps.

Step 3: Dependents

Step 3 is where you claim credits for dependents, which directly reduce the tax withheld each pay period. For 2026, you enter $2,200 for each qualifying child under 17 and $500 for each other dependent.⁵ These numbers match the Child Tax Credit and the Credit for Other Dependents. The full amounts apply if your income is $200,000 or less, or $400,000 or less if you’re married filing jointly; above those thresholds the credits begin to phase out.⁶

Step 4: Other Adjustments

Step 4 covers three separate adjustments.

Step 4(a) is for non-wage income you expect during the year, such as interest, dividends, or retirement distributions. Entering it here raises your withholding so you don’t have to make separate estimated tax payments.
Step 4(b) is for deductions beyond the standard deduction. The 2026 standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for head of household. If you expect $40,000 in itemized deductions as a single filer, you’d enter $23,900 here ($40,000 minus $16,100).⁷
Step 4(c) is a flat dollar amount of extra withholding per paycheck. Useful if you consistently owe at filing time and want to close the gap.

Multiple Jobs or a Working Spouse

Step 2 is the one most people skip, and it’s the most common cause of under-withholding. If you hold more than one job at the same time, or you’re married filing jointly and your spouse also works, each employer by default withholds as though its wages are your only income. The combined paychecks push you into higher brackets than any one employer is accounting for.⁵

You have three ways to fix this:

The IRS Tax Withholding Estimator at irs.gov/W4App gives the most accurate result, especially if there’s self-employment income in the mix.
The Multiple Jobs Worksheet on page 3 of the W-4 produces an additional withholding amount you enter in Step 4(c).
If there are only two jobs between you and your spouse, both W-4s can check the Step 2(c) box. This splits the standard deduction and tax brackets in half for each job. It works well when the two jobs pay roughly the same, but can over-withhold when one pays significantly more than the other.

Whichever method you use, only fill out Steps 3 and 4 on the W-4 for the highest-paying job. Leave those steps blank on the others. Claiming the same dependents on two forms doubles the credit in your employer’s calculation and pulls your withholding too low.

Claiming Full Exemption From Withholding

If you expect to owe no federal income tax for the year, you can claim complete exemption from withholding. Your employer will withhold nothing for federal income tax, though FICA still comes out. To qualify, both of these must be true:⁵

You had no federal income tax liability in the prior year.
You expect no federal income tax liability in the current year.

To claim it on the 2026 W-4, write “Exempt” in the designated space and complete only Steps 1(a), 1(b), and 5. Skip everything else.⁵ This mostly applies to students and part-time workers whose earnings fall below the filing threshold.

An exempt W-4 expires at the end of the calendar year. To keep the exemption going, you must file a new W-4 claiming exempt status by February 15. Miss the deadline and your employer must begin withholding as if you were single with no adjustments, which produces the highest withholding rate. Filing a late W-4 after February 15 only affects future paychecks; your employer won’t refund what was already withheld.⁸

Claiming exempt when you don’t qualify carries a $500 civil penalty under federal law, on top of the taxes and interest you’ll owe at filing.⁹ A large shortfall can also trigger an underpayment penalty.

Bonuses and Other Supplemental Pay

Your W-4 settings primarily govern regular wages. Bonuses, commissions, overtime, severance, and similar payments are classified as supplemental wages and often get taxed differently. If your employer pays them separately from regular wages, it can withhold a flat 22% rather than running them through the W-4 formula. The 22% rate applies as long as your total supplemental wages for the year stay under $1 million; anything above that is withheld at 37%.¹⁰ The 22% flat rate can under- or over-withhold compared to your actual marginal rate, and you’ll reconcile the difference on your return.

Avoiding an Underpayment Penalty

If your W-4 under-withholds enough, you’ll owe an underpayment penalty on top of the tax itself. The IRS charges interest on the shortfall at a rate that moves quarterly: 7% for the first quarter of 2026, dropping to 6% for the second.¹¹

You avoid the penalty if any one of these is true:¹²

Your return shows you owe less than $1,000 after subtracting withholding and credits.
Your total withholding and estimated payments cover at least 90% of what you owe for the current year.
Your total payments equal or exceed 100% of the tax shown on last year’s return. If your adjusted gross income exceeded $150,000, or $75,000 for married filing separately, that threshold rises to 110%.

The prior-year safe harbor is the easiest to rely on because last year’s tax number is already fixed. If your income jumps, aiming withholding at 110% of last year’s tax keeps you penalty-free even if you end up owing a large balance.

When the IRS Overrides Your W-4

If the IRS decides your withholding is too low, it can override your W-4 with a “lock-in letter” sent to your employer. The letter specifies the withholding arrangement your employer must use and takes effect no sooner than 60 days after the letter date.¹³

Once a lock-in is in place, your employer cannot withhold less than the IRS-set level even if you submit a new W-4 asking for less. Your employer must disregard any W-4 that would reduce withholding and must block you from using an online W-4 system to lower it.¹⁴ You can still submit a W-4 that increases withholding above the lock-in level. To get the lock-in lifted, you have to work directly with the IRS.

When to Submit a New W-4

You’re not stuck with the W-4 you filled out on your first day. File a new one whenever your situation shifts in a meaningful way: getting married or divorced, having a child, a spouse starting or stopping work, taking a second job, a significant raise, or a large change in non-wage income. There’s no penalty for updating frequently, and the change takes effect as soon as your employer processes it.

The IRS Tax Withholding Estimator at irs.gov/W4App walks you through your current numbers and tells you exactly what to enter on a fresh form. Running through it once a year, especially after any life change, is the easiest way to stay on target.

State Withholding Is Separate

Federal withholding is only half the picture. Most states with an income tax require their own withholding form, and many still use the old-style “allowances” or “exemptions” system that the federal W-4 dropped in 2020. Only a handful of states accept the federal W-4 for state purposes. Nine states have no income tax at all: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.

Qualifying as exempt on your federal W-4 does not automatically exempt you from state withholding. If your state has one, check for its own exemption rules and file the right state form separately. If you live in one state and work in another, reciprocity agreements between some states let you pay income tax only to your state of residence, usually by filing a form with your employer to stop work-state withholding. Not every bordering pair has reciprocity, so confirm before you assume.

1
Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate
2
Internal Revenue Service. Publication 15-T, Federal Income Tax Withholding Methods
3
Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source
4
Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
5
Internal Revenue Service. Form W-4, Employee’s Withholding Certificate
6
Internal Revenue Service. Child Tax Credit
7
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
8
Internal Revenue Service. Topic No. 753, Form W-4, Employees Withholding Certificate
9
Office of the Law Revision Counsel. 26 USC 6682 – False Information With Respect to Withholding
10
Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
11
Internal Revenue Service. Quarterly Interest Rates
12
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
13
Internal Revenue Service. Withholding Compliance Questions and Answers
14
Internal Revenue Service. Understanding Your Letter 2800C