No more allowances — the modern W-4 has five steps tied to your actual income, family situation, and deductions. Here's how to fill it out correctly and avoid a surprise in April.
The W-4 determines how much federal income tax your employer withholds per paycheck. Since 2020 it has five plain-language steps — no more allowances. Complete all five accurately and you'll neither overpay (giving the IRS an interest-free loan) nor underpay (triggering a penalty). The IRS Tax Withholding Estimator is the most precise tool for complex situations.
The W-4 form your employer has on file determines how much federal income tax gets withheld from every paycheck. Get it right and you break even: no large refund (which means you overwitheld — effectively giving the IRS an interest-free loan all year) and no surprise balance due (which can trigger an underpayment penalty). The problem is that millions of employees are still on a pre-2020 form.
The old W-4 asked you to claim "allowances." More allowances equaled less withholding. The math was counterintuitive, and two-earner households routinely underwitheld because each employer withheld as if that job were the household's only income. The IRS eliminated allowances entirely when it redesigned the form; Form W-4 now uses five plain-language steps tied to your actual income, dependents, and deductions.
If you submitted a W-4 before 2020 and never updated it, your employer continues to honor it under the old rules. It isn't invalid — but running through the new version typically gets you closer to zero.
Enter your legal name, address, and Social Security number. Select your filing status:
Filing status determines your standard deduction and bracket width. Selecting the wrong status — the most common example is a married employee who selects Single — causes persistent over-withholding that won't resolve until the form is corrected.
Step 2 is the most commonly skipped step and the biggest source of under-withholding. When you skip it, each employer withholds as if that job were your only income — but your combined household income may push you into a higher bracket, and neither employer's withholding accounts for the difference.
Complete Step 2 if you work two or more jobs simultaneously, or if you're married filing jointly and your spouse also works.
Three options are available:
Option A takes about 15 minutes and handles unequal salaries, investment income, and other variables the worksheet can miss. For a two-earner household earning different amounts, it can prevent a $2,000–$4,000 surprise at filing.
Step 3 lets you credit qualifying dependents directly against your withholding so the tax benefit flows throughout the year — you don't have to wait until April to receive it as a refund. The credit amounts are printed on the current W-4 instructions reflecting any 2026 adjustments from the One Big Beautiful Bill Act. For the full breakdown of how OBBBA adjusted dependent credits and income brackets, see the individual tax changes guide.
Income ceiling: this step applies only if your expected income from this job is $200,000 or less ($400,000 or less for married filing jointly). Above those thresholds, skip Step 3 and use the IRS Estimator to account for credits.
Three sub-lines address income or deductions outside of regular wages:
4(a) — Other Income: Enter expected income not subject to withholding — freelance work, rental income, interest, dividends. Adding it here covers the tax proactively instead of owing the full amount in April.
4(b) — Deductions: If you plan to itemize or claim above-the-line deductions that exceed your standard deduction, enter the excess here to reduce withholding. Above-the-line deductions include contributions to a SEP-IRA, solo 401(k), HSA, and deductible student loan interest. Use the Deductions Worksheet on page 3 of the instructions.
4(c) — Extra Withholding: Request a specific flat dollar amount withheld each pay period. Useful if you're catching up after under-withholding earlier in the year, or if Option A of Step 2 directed you to add a per-period amount here.
Your signature certifies the form's accuracy under penalty of perjury. Submit the completed form to your employer's HR or payroll department — not to the IRS. Employers must implement the new withholding starting with the first or second full payroll period after receipt, per IRS Publication 15-T, which governs employer withholding tables and procedures.
The One Big Beautiful Bill Act changed standard deduction amounts, income brackets, and family credit amounts for tax year 2026. A W-4 you filed before those changes took effect may yield slightly off withholding. See the individual tax changes guide for specifics on what changed.
Beyond OBBBA, other common triggers for updating your W-4:
Doing this now — mid-year — leaves enough payroll periods to correct any gap before December 31. The mid-year tax planning checklist covers other moves worth making before year-end.
The IRS charges an underpayment penalty only when both conditions are met:
1. You owe more than $1,000 after credits and withholding, AND 2. Your withholding plus any quarterly estimated tax payments covered less than 90% of this year's tax — OR less than 100% of last year's total tax bill.
The second condition — the prior-year 100% safe harbor — is the practical backstop for most employees. If your withholding at least equals last year's total tax, no penalty applies even if you owe in April. For business owners who combine a W-4 salary from an S-corp with pass-through income, the employer payroll taxes guide covers the full estimated-tax compliance picture.
A large April refund is the mirror image of under-withholding: you're paying the right tax, just sending it to the IRS months early instead of when it's due. Neither extreme is ideal. The IRS Tax Withholding Estimator targets a balance due of roughly zero — close enough to avoid a penalty without over-lending the government your cash.
Hand or email the completed form to your HR or payroll department — do not mail it to the IRS. Employers are required to implement the new withholding starting with the first or second full payroll period after receiving the form. Keep a copy for your own records. There is no IRS deadline for updating a W-4; you can submit a new one any time your situation changes.
Yes, but only if you owed zero federal income tax last year and expect to owe zero this year. Write 'Exempt' in Step 4(c) and leave Steps 2, 3, and 4 blank. Exemption expires every year — you must file a new W-4 claiming exempt by February 15 of the following year or your employer will default to Single with no adjustments. Most employees do not qualify.
No — the federal W-4 only governs federal withholding. Most states have a separate state withholding form (sometimes also called a W-4 or equivalent). If you work in a state with income tax, check with HR whether a state form also needs updating when your situation changes.
A W-4 is the form you give your employer at the start of employment (or when your situation changes) to tell them how much federal income tax to withhold from your paychecks. A W-2 is the summary your employer sends you each January showing total wages paid and all taxes withheld during the prior year — it's used to prepare your federal tax return.
The IRS recommends reviewing your withholding at least once a year, and whenever a major tax event occurs: marriage, divorce, new child, job change, significant income change, or new deductions (home purchase, retirement account contributions). A mid-year review is especially useful because it leaves enough payroll periods to make up any gap before December 31 without a large final-quarter catch-up.