Short answer: most people only need Step 1 and Step 5. Name, address, Social Security number, filing status, signature. Steps 2 through 4 exist for specific situations — a second job, a working spouse, dependents, or income your employer can't see. If none apply, you're done in two minutes.
Every figure below comes from Form W-4 (2026) (created 12/8/25) at irs.gov/FormW4. These amounts change annually — check the current form before relying on any number.
What the W-4 actually does
It tells your employer how much federal income tax to hold out of each paycheck. It isn't a tax return; your employer keeps it on file rather than sending it to the IRS.
Withhold too little and you owe at filing, maybe with a penalty. Withhold too much and you've made an interest-free loan, repaid as a refund. Aim near zero.
Step 1: Personal information
Two things trip people up:
- Your name must match your Social Security card. If it doesn't, your earnings may not be credited to your record.
- Head of household is narrower than people assume. Check it only if you're unmarried *and* pay more than half the cost of keeping up a home for yourself and a qualifying individual.
Step 2: The step behind most surprise tax bills
Complete this if you hold more than one job at a time, or you're married filing jointly and your spouse works.
The problem: each employer withholds as if its paycheck is your only income, applying the standard deduction and the lowest brackets. Two jobs doing that independently leave you short at filing.
Three options. Do only one:
- (a) The IRS Tax Withholding Estimator at irs.gov/W4App. Most accurate. Use it if you or your spouse have self-employment income.
- (b) The Multiple Jobs Worksheet on page 3. Slightly less accurate, but you keep the worksheet — only the resulting dollar amount lands on the form, at Step 4(c), so your spouse's income stays off your employer's copy.
- (c) The checkbox. Only if there are exactly two jobs total, and you must check it on *both* W-4s.
The checkbox is generally better when the lower-paying job pays more than half of what the higher-paying job pays. Otherwise it over-withholds, and the wider the gap the bigger the excess.
Two rules people miss:
- Complete Steps 3 through 4(b) on only one W-4 — the highest-paying job. Leave those steps blank on the others.
- The worksheet tables run out if more than one job pays over $120,000, or you have more than three jobs. Use the estimator or Pub. 505.
Step 3: Dependents and other credits
On the 2026 form, if your total income will be $200,000 or less ($400,000 or less married filing jointly):
- $2,200 for each qualifying child under 17
- $500 for each other dependent
A qualifying child must be under 17 as of December 31, generally live with you more than half the year, and have the required Social Security number.
You can add other credits you expect — foreign tax credit, education credits — and enter the combined total. Above those income thresholds, use the estimator.
Step 4: Other adjustments
- 4(a) Other income. Interest, dividends, retirement income — money arriving with no withholding of its own. Entering it here usually spares you from making estimated tax payments.
- 4(b) Deductions. Only if you expect deductions beyond the basic standard deduction. The number comes from the Deductions Worksheet on page 4.
- 4(c) Extra withholding. A flat dollar amount per pay period. Blunt, but it fixes almost anything.
The Deductions Worksheet is where 2026 changed — tipped and hourly workers should read it. New lines, with income ceilings printed on the form:
- Qualified tips — up to $25,000, if total income is under $150,000 ($300,000 joint)
- Qualified overtime — up to $12,500 ($25,000 joint), same income limits, counting only the "and-a-half" portion of time-and-a-half pay
- Qualified passenger vehicle loan interest — up to $10,000, under $100,000 ($200,000 joint)
- Age 65 or older — $6,000 for you, plus another $6,000 for your spouse if they also qualify, under $75,000 ($150,000 joint)
Those lines total to line 15, which goes at Step 4(b) and cuts your withholding — so accuracy matters. Eligibility rules are detailed — see the Instructions for Schedule 1-A (Form 1040). Not sure? Leave the line blank and claim the deduction when you file.
The 2026 worksheet also prints the standard deduction: $32,200 married filing jointly, $24,150 head of household, $16,100 single or married filing separately — all indexed, all different next year.
Step 5: Sign it
The form is not valid unless you sign it. Without a valid form, your employer withholds as if you're single with no other entries.
Don't alter it either. Striking the certification language, defacing the form, or adding entries it doesn't ask for makes it invalid. You sign under penalties of perjury, and the form warns that fraudulent information may subject you to penalties.
"Exempt" means less than people think
Claim exemption from withholding for 2026 only if you had no federal income tax liability in 2025 *and* expect none in 2026. Not "I got a refund" — zero liability. Claim it wrongly and nothing is withheld all year; you owe the tax and possibly penalties at filing.
Exemption expires, too. The 2026 form says you must submit a new W-4 by February 16, 2027 to continue it.
If you're the employer
- Keep each signed W-4 at least 4 years. Don't send them to the IRS unless directed to.
- Put a new W-4 into effect no later than the start of the first payroll period ending on or after the 30th day after you get it. Sooner is fine.
- If an employee never gives you one, withhold as single or married filing separately with no other entries in Steps 2, 3, or 4.
- If the IRS sends a lock-in letter, follow it: disregard any later W-4 that withholds less, but honor one that withholds more.
- Federal only. Most states have their own withholding certificate — check your state revenue agency.
When to redo it
Marriage, divorce, a birth, a job starting or ending, a spouse returning to work, a significant raise. Re-run the estimator early each year, since brackets and deduction amounts move.
Once withholding is set, the recurring work is documentation — every pay period calculated the same way and recorded. Tools like UWageCo prepare payroll statements from the figures you enter; each document discloses that its data came from the customer, and you and your accountant remain responsible for anything filed with a tax authority.
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*General information, not legal or tax advice. For your situation, talk to a CPA, enrolled agent, or tax attorney, or contact the IRS.*