How to Fill Out a W-4 in 2026: A Line-by-Line Guide
Fill out the 2026 W-4 step by step and see what each line does to your paycheck: Step 3 credits, Step 4 amounts, and the new qualified tips and overtime lines.
This article is for general information, not tax or legal advice. Tax figures change most years. Verify current numbers against IRS Publication 15-T and the form’s own instructions, or talk to a tax professional before you file.
A blank W-4 asks you a handful of questions and tells you nothing about what your answers will do to your paycheck. Most guides stop at what to write in each box, which is the easy half of the problem.
So we will walk the 2026 Form W-4 in order and, for every entry, trace where it lands inside the IRS worksheet your payroll department actually runs, plus what it costs or saves you per check.
The 2026 Form W-4 in five steps
- Step 1. Enter your name, address, Social Security number, and check one of the three filing-status boxes.
- Step 2. Complete this only if you hold more than one job, or you are married filing jointly and your spouse also works.
- Step 3. Enter $2,200 for each qualifying child under 17 and $500 for each other dependent, then add them up.
- Step 4. Add other untaxed income in 4(a), deductions beyond the standard deduction in 4(b), and extra per-check withholding in 4(c).
- Step 5. Sign and date it. Give it to your employer, never to the IRS.
If you are single, work one job, have no dependents, and take the standard deduction, Steps 1 and 5 are the whole job. Everything below is about what you give up by stopping there.
What the W-4 controls, and what it doesn’t
The W-4 is not a tax return. It is a note to your payroll department covering exactly one thing: how much federal income tax to pull out of each check.
It does not touch FICA. Social Security stays at 6.2% up to the $184,500 wage base in 2026, and Medicare stays at 1.45% on everything, no matter what you write. Those rates are fixed by law, not by your form. If you want the detail on where the Social Security withholding stops, see when Social Security tax stops.
What you actually owe is settled in April on your 1040, and the form has no say in that either. All it decides is whether you prepay too much (refund), too little (a bill), or roughly the right amount. For a broader map of everything else on your stub, read gross pay vs net pay.
Bonuses sit outside its reach too, since those usually get the 22% supplemental flat rate instead (here is why your bonus looks overtaxed). And the form never expires. Under IRC section 3402(f)(3), a W-4 stays in force until you replace it, so that 2019 form with allowances on it is still legally running your withholding today.
Steps 1 and 5: the only two everyone has to do
Step 1 is name, address, SSN, and filing status. Step 5 is your signature. These are the two mandatory pieces, and both trip people up in the same predictable ways.
Step 1(c) has three boxes, not five. Your tax return recognizes five filing statuses. The W-4 offers three:
- (a) Single or Married filing separately
- (b) Married filing jointly or Qualifying surviving spouse
- (c) Head of household
If you file as a qualifying surviving spouse (what used to be called qualifying widow or widower), you check box (b). There is no separate box, and checking Single instead will over-withhold you all year.
An unsigned W-4 is not a W-4. Payroll is required to treat it as though you never handed anything in, which means withholding at single rates with no adjustments. That is the most expensive blank line on the page.
Your filing-status choice selects the rate schedule payroll uses, so it moves every bracket floor at once. Everything else on the form is an adjustment on top of that choice.
Step 2: a second job or a working spouse
Withholding math assumes each job is your only job. Two jobs means two employers each giving you the full standard deduction and the full bottom brackets, and you end up under-withheld.
Step 2 gives you three ways to fix that, in descending order of accuracy:
- The IRS Tax Withholding Estimator at irs.gov. Most accurate, especially with uneven pay.
- The Multiple Jobs Worksheet on page 3 of the form. Result goes in Step 4(c).
- The 2(c) checkbox. Simplest, and reasonable when the two jobs pay similar amounts.
If you use the checkbox, it has to be checked on both employers’ forms. Checking it on one only gets you half the correction.
That checkbox is doing more than it looks like. It sets the fixed amount on the worksheet to $0, and it also switches payroll to the separate Step 2 checkbox rate schedule, where every tax bracket is half as wide. Your wages climb into the higher rates twice as fast. Withholding on this job jumps hard the moment the box goes on, which is why so many people panic and un-check it. In the example further down, one checkbox takes a biweekly worker from $204.15 to $359.35.
Step 3: dependents, the biggest lever on your check
For 2026, Step 3 is split into two lines:
- Line (a): $2,200 for each qualifying child under age 17
- Line (b): $500 for each other dependent
Multiply, add, and put the total in the Step 3 box. The child figure moved up from $2,000, so a guide written before December 2025 will give you the wrong number.
Step 3 hands you a credit, not a deduction, and that distinction is where people get tripped up. It does not shrink your taxable wages. Payroll calculates your tentative withholding first, divides your Step 3 total by your number of pay periods, and subtracts that dollar for dollar at the end.
One $2,200 child, by pay frequency:
| Pay frequency | Pay periods | Credit per check |
|---|---|---|
| Weekly | 52 | $42.31 |
| Biweekly | 26 | $84.62 |
| Semimonthly | 24 | $91.67 |
| Monthly | 12 | $183.33 |
Same annual credit, different per-check size, purely because of the divisor. If your pay schedule is about to change, semimonthly vs biweekly pay covers what that does to the rest of your check, and the pay period converter will do the division for you.
One warning. Claim your dependents on one W-4 only, the highest-paying job. If you and your spouse both enter the same kids, you will each get the credit spread through the year and hand it back in April.
Step 4: the adjustment lines, and what’s new for 2026
Step 4 is where the form stops being paperwork and starts being a control panel, and it is where the 2026 revision changed the most. The word “Optional” is gone from the Step 4 heading, for one.
4(a): other income
Income nobody withholds on: interest, dividends, retirement distributions, gig and 1099 work. Entering it here raises the annual wage figure payroll starts from, so it gets taxed at your marginal rate.
At 12%, entering $4,000 adds $480 of withholding across the year, about $18.46 per biweekly check. You are prepaying tax on that side income through your day job instead of writing quarterly estimated checks.
4(b): deductions
Only for deductions above the standard deduction ($16,100 single, $32,200 married filing jointly, $24,150 head of household in 2026). Leave it blank and payroll assumes the standard deduction, which the 2026 form now says out loud.
The Deductions Worksheet behind this line grew to 15 lines and got its own page, because the One Big Beautiful Bill Act added three new deductions that belong here:
- Line 1(a), qualified tips. Up to $25,000, phasing out above $150,000 of income ($300,000 married filing jointly).
- Line 1(b), qualified overtime. Up to $12,500 ($25,000 married filing jointly), same income thresholds.
- Qualified passenger vehicle loan interest. Up to $10,000, phasing out above $100,000 ($200,000 married filing jointly).
Coverage of the tips and overtime deductions is everywhere by now. What gets left out is that entering them in 4(b) is what turns the deduction into a bigger paycheck now, instead of a bigger refund fourteen months from now.
Note what does not go in 4(b): your 401(k) and pre-tax health premiums. Those come out before the withholding math even starts, through payroll, not through your W-4. See how a 401(k) changes take-home pay or run it through the 401(k) paycheck impact calculator.
4(c): extra withholding
A flat dollar amount added to every single check, applied last, after all the division. There is no marginal rate to reason about here. Put $50 in the box and $50 more comes out, every time.
This is the precision knob. If you owed $1,300 last April and you get 26 checks a year, $50 in 4(c) closes the gap.
The exempt checkbox
New for 2026: a real checkbox after Step 4 replaces writing “Exempt” by hand under 4(c). You qualify only if you had zero federal income tax liability last year and expect zero this year. Both tests, not either.
Exempt status is the one part of the W-4 that expires. It has to be re-filed every year, and employees who claimed exempt for 2025 had to submit a new form by February 17, 2026 to keep it.
What changed from the old form
| 2020 to 2025 form | 2026 Form W-4 | |
|---|---|---|
| Length | 4 pages | 5 pages |
| Step 3 child credit | $2,000 per child under 17 | $2,200 per child under 17 |
| Claiming exempt | Write “Exempt” below 4(c) | Dedicated checkbox after Step 4 |
| Step 4 heading | Labeled “(optional)“ | No longer optional |
| Deductions Worksheet | Short, itemized only | 15 lines, adds tips, overtime, vehicle loan interest |
One person, six W-4s, six different paychecks
Here is the whole article in one table. Same person, same salary, six versions of the form.
The setup: single filer, $2,400.00 gross biweekly ($62,400 a year), 26 pay periods, no pre-tax deductions.
Payroll runs this through IRS Publication 15-T, Worksheet 1A. Each W-4 entry lands on a specific line:
| W-4 entry | Worksheet 1A line | What it does |
|---|---|---|
| Step 1(c) filing status | selects the rate schedule | moves every bracket floor |
| Step 2(c) checkbox | zeroes 1g, switches schedules | halves every bracket width, so withholding climbs fast |
| Step 4(a) other income | 1d | raises annual wages, taxed at your marginal rate |
| Step 4(b) deductions | 1f | lowers the base, saves at your marginal rate |
| Step 3 credits | 3a, then divided on 3b | dollar-for-dollar cut, spread across the year |
| Step 4(c) extra withholding | 4a | dollar-for-dollar add, per check |
Baseline, Steps 1 and 5 only. Annualized wages are $2,400 × 26 = $62,400. Line 1g subtracts a fixed $8,600, giving an Adjusted Annual Wage Amount of $53,800. Running that through the 2026 single schedule: $1,240 + 12% of ($53,800 − $19,900) = $5,308.00 a year, or $204.15 per check.
That $8,600 is a fixed worksheet constant, not the standard deduction. The rest of the deduction lives in the 0% band at the bottom of the withholding rate schedule, and how federal withholding is calculated walks through the full reconciliation line by line.
Now change one thing at a time:
| Scenario | W-4 entry | Line 1i | Annual tentative | Per paycheck | Change |
|---|---|---|---|---|---|
| A. Steps 1 + 5 only | none | $53,800 | $5,308.00 | $204.15 | baseline |
| B. One child | Step 3 = $2,200 | $53,800 | $5,308.00 | $119.53 | −$84.62 |
| C. B plus extra withholding | Step 4(c) = $50 | $53,800 | $5,308.00 | $169.53 | +$50.00 |
| D. $4,000 side income | Step 4(a) = $4,000 | $57,800 | $5,788.00 | $222.62 | +$18.46 |
| E. $5,000 extra deductions | Step 4(b) = $5,000 | $48,800 | $4,708.00 | $181.08 | −$23.08 |
| F. Two-job box checked | Step 2(c) checked | $62,400 | $9,343.00 | $359.35 | +$155.20 |
Read the spread: from $119.53 to $359.35 on identical wages. Nothing about this person’s actual tax bill changed. Only the timing did.
Scenario F is worth staring at. Line 1g drops to $0, every bracket in the schedule halves in width, and the tentative annual figure jumps to $9,343.00, up 76%. That is deliberate: it is covering the tax on a second income the second employer is not withholding for.
Scenarios D and E are just marginal-rate arithmetic. $4,000 at 12% is $480 a year; $5,000 at 12% saves $600. Divide either by 26 and you have the per-check number.
To run your own version of this table, the W-4 paycheck withholding calculator takes the same inputs. Salaried readers can start from a salary figure, hourly readers from an hourly rate or the hourly wage after taxes guide.
One more thing about “should I claim 0 or 1.” That vocabulary is from the pre-2020 form and has no equivalent today. Claiming 0 translates roughly to scenario A, Steps 3 and 4 left empty, plus a dollar amount in 4(c) if you want more held back. Claiming 1 has no modern equivalent at all.
And your state is a separate form. Your federal W-4 does not control state withholding. Most states have their own certificate, some still use allowances, and nine have no income tax at all. Salary after taxes by state covers what varies, and the state salary calculator runs the numbers.
For employers: handling a W-4 you just received
If an employee hands you a fresh form, four rules cover almost everything.
Don’t mail it anywhere. The W-4 stays with you. Keep it on file for at least four years. It is not sent to the IRS.
Put it in effect on time. No later than the start of the first payroll period ending on or after the 30th day after you receive it. Sooner is fine.
Reject invalid forms. Unsigned, altered, or defaced forms are invalid. Keep withholding on the last valid form on file, or single with no adjustments if there isn’t one. Tell the employee so they can submit a clean one.
Old forms still run. Pre-2020 W-4s use the allowances path, at $4,300 per allowance. You do not get to force anyone onto the 2026 Form W-4, and nobody has to refile just because the year rolled over.
Between per-employee W-4 settings, separate state certificates, and your own employer-side taxes, this is where manual spreadsheets start to fall apart. That is the problem WorkLogs44 was built for: every employee carries their own W-4 fields, including the Step 2(c) checkbox, Step 3 credits, Step 4(c) extra withholding, and legacy allowances, and the whole team runs at once. Changing one field and watching net pay move teaches this form faster than reading about it does.
For more on the employer side, see common payroll mistakes, running payroll for one employee, or the multi-employee payroll calculator.
When to fill out a new one
You never have to refile. But you probably should after: marriage or divorce, a birth or adoption, starting a second job, your spouse starting or leaving work, a large raise, or a refund or bill last April that felt wrong.
The verification loop is the step almost everyone skips. Submit the form, then check the next pay stub. If the federal withholding line doesn’t match what you expected, the form did something you didn’t intend, and a corrected W-4 takes five minutes.
Frequently Asked Questions
Do I have to fill out a new W-4 every year?
No. A W-4 stays in effect until you replace it, including one signed in 2019 that still uses allowances. The only exception is claiming exempt, which has to be renewed each year.
Should I claim 0 or 1 on my W-4?
Allowances were removed from the form in 2020, so neither option exists anymore. The modern equivalent of claiming 0 is leaving Steps 3 and 4 blank, and adding a dollar amount in Step 4(c) if you want even more withheld.
How much does one child on Step 3 change my paycheck?
The $2,200 credit is divided by your number of pay periods and subtracted from withholding, so a biweekly worker keeps about $84.62 more per check and a weekly worker about $42.31.
What is the difference between Step 4(a) and Step 4(c)?
Step 4(a) is annual income nobody withholds on, which gets taxed at your marginal rate, so $4,000 there costs about $18.46 per biweekly check at 12%. Step 4(c) is a flat dollar amount added to every check, one for one.
What happens if I check the box in Step 2(c)?
Payroll sets Worksheet 1A line 1g to $0 and switches to the Step 2 checkbox rate schedule, where every bracket is half as wide, so withholding rises sharply on purpose. In our $62,400 example it moves the biweekly figure from $204.15 to $359.35, and it has to be checked on both jobs' forms.
What changed on the 2026 W-4?
It grew to five pages, the child credit went from $2,000 to $2,200, Exempt became a real checkbox, the word Optional was dropped from Step 4, and the Deductions Worksheet added lines for qualified tips, qualified overtime, and vehicle loan interest.
Where do I put tips or overtime on the 2026 W-4?
On the Deductions Worksheet that feeds Step 4(b), line 1(a) for qualified tips up to $25,000 and line 1(b) for qualified overtime up to $12,500 ($25,000 married filing jointly), if your income is under $150,000 ($300,000 jointly).
Does my W-4 change how much Social Security and Medicare I pay?
No. Social Security is 6.2% up to the $184,500 wage base in 2026 and Medicare is 1.45% on all wages, regardless of what you enter. The W-4 only steers federal income tax.