W-4 Withholding Explained 2026
Form W-4 tells your employer how much federal income tax to withhold from each paycheck. Fill it correctly and you avoid a large tax bill (or a large refund) at filing time. The form was redesigned in 2020 and no longer uses allowances; it now works directly from dollar amounts tied to the standard deduction.
What the W-4 actually does
Your employer uses the information on your W-4, together with IRS Publication 15-T Percentage Method Tables, to calculate how much to withhold per pay period. The withholding is a prepayment of your annual income tax liability. At the end of the year you file Form 1040, calculate your actual tax, and reconcile: if you withheld too much you get a refund; too little and you owe the difference.
The W-4 does not affect FICA (Social Security at 6.2% and Medicare at 1.45%). Those are fixed rates applied to every paycheck regardless of your W-4 elections.
Step 1: Personal information and filing status
Step 1 is required. Filing status controls which withholding table and standard deduction your employer applies:
| Filing status | 2026 standard deduction | Withholding note |
|---|---|---|
| Single or Married Filing Separately | $16,100 | Highest withholding rate |
| Married Filing Jointly | $32,200 | Lower withholding, assumes two incomes merge |
| Head of Household | $24,150 | Between Single and MFJ |
Married filers who both work should be aware that the MFJ setting assumes your combined income is taxed as a unit. If each spouse files separately and checks MFJ, total withholding may be too low at higher combined incomes. That is why Step 2 exists.
Step 2: Multiple jobs or spouse works
If you or your spouse have a second job, the IRS gives you three options in Step 2. Only complete this step if it applies to you.
- Option A (IRS Estimator): Use the online tool at irs.gov for the most precise result. It accounts for both incomes together.
- Option B (Worksheet): Complete the Multiple Jobs Worksheet on page 3 of the W-4 PDF and enter the result in Step 4(c). More precise than the checkbox, less convenient than the estimator.
- Option C (Checkbox): Check the box. Your employer withholds as though your income from this job fills the higher brackets alone. This is conservative (you may over-withhold slightly) but simple and correct for most households.
Leaving Step 2 blank when you have two jobs typically results in underpayment.
Step 3: Claim dependents
Step 3 reduces withholding by signaling that you will claim dependents at filing time. Only complete this step if your total income is at or below $200,000 (or $400,000 for joint filers):
- Qualifying children under 17: multiply the number by $2,000 and enter the total.
- Other dependents (17 and over, or other qualifying relatives): multiply by $500.
The amounts entered here are subtracted from your estimated tax before withholding is calculated, so they reduce your per-paycheck deduction by roughly the amounts divided by your pay periods.
Step 4: Other adjustments (optional)
Step 4 has three sub-parts, all optional:
- 4(a) Other income: Enter annual income not subject to withholding, such as dividends, interest, or self-employment income. Your employer will withhold extra to cover it.
- 4(b) Deductions: If you plan to itemize or take deductions above the standard deduction (mortgage interest, large charitable gifts), enter the expected excess here. This reduces withholding.
- 4(c) Extra withholding: A flat per-period dollar amount added to every paycheck. Useful if you owe from prior years or want to build a refund cushion.
When to update your W-4
You do not need to refile every year, but you should update after any event that changes your tax situation:
- Marriage or divorce
- Having or adopting a child
- Starting or leaving a second job
- A large change in income, investment gains, or bonuses
- Claiming a new deduction (mortgage, student loan interest)
Withholding versus the tax you actually owe
At a $60,000 salary (single, no adjustments), the federal income tax is roughly $5,020, plus FICA, leaving about $50,390 take-home annually. Your W-4 elections spread that liability across your pay periods. If you find that your refund is very large each April, increasing your Step 3 or 4(b) amounts (or reducing 4(c)) keeps more money in your pocket throughout the year. Use the US Paycheck Calculator to see how filing status and elections affect each paycheck.
Frequently asked questions
Do I need to fill out a new W-4 every year?
No, unless you want to change your withholding or your circumstances change significantly. Your employer keeps your last W-4 on file. You should update it after marriage, divorce, the birth of a child, or if you start a second job.
What happens if I claim too many dependents on my W-4?
Too little is withheld each paycheck and you will owe tax at filing time. If you owe more than $1,000 and withheld less than 90% of your liability (or 100% of last year's tax), you may also owe a small underpayment penalty.
What is the W-4 Step 2 checkbox and should I use it?
Checking the box in Step 2 is the simplest option when you or your spouse have a second job. It tells your employer to withhold as though your income fills the higher brackets on its own, which is conservative. If you want more precision, use the Multiple Jobs Worksheet or the IRS withholding estimator instead.
Can I ask my employer to withhold extra federal tax?
Yes. Enter any additional per-paycheck amount in Step 4(c). This is useful if you have freelance income, investment income, or other earnings not subject to withholding, so you avoid a large bill or underpayment penalty at filing time.
Sources: IRS Publication 15-T (2026); IRS Form W-4 instructions. Last updated 2026-11-04.