W-4 Calculator 2026: How Much Should You Withhold?

Read two numbers off your pay stub and know where you stand before April. Estimates only, not tax advice.

By the Easy Guides Editorial Team · Updated for 2026

Box on your pay stub labeled federal income tax or FED W/H. Do not count Social Security or Medicare.

Step 3, your dependents

Worth $2,200 each on the 2026 form.

Worth $500 each.

Step 4, the optional lines

Interest, dividends, or retirement income with no withholding of its own.

Only if you itemize or claim other deductions beyond the standard deduction.

Fewer checks left means a bigger amount per check to close the same gap.

How this calculator works

It answers the only question the W-4 really asks: will enough tax come out of your paychecks this year? To find out, it needs two things. First, what you will earn, which sets the tax you owe. Second, what your employer already takes out each payday, which you can read off any pay stub.

From your pay it subtracts the 2026 standard deduction ($16,100 single, $32,200 married filing jointly) plus anything you enter on line 4(b), runs the rest through the official IRS brackets, then subtracts your Step 3 dependent credits. That is your tax for the year. Next it multiplies your current per paycheck withholding by the number of paydays in a year. That is your withholding for the year. The difference between the two is the whole answer.

If withholding falls short, the gap divided by the paychecks you have left is the number for line 4(c). If it runs over, you are due a refund and can lower your withholding instead. What the tool leaves out: head of household filing, the new deductions for qualified tips and overtime that appear on the 2026 Step 4 worksheet, the senior deduction, state and local tax, and credits beyond the ones for dependents. Rates come from IRS Rev. Proc. 2025-32 and the 2026 Form W-4. Sources live in our editorial policy.

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Frequently asked questions

Compare two numbers: the federal tax you will owe for the year, and what your employer will withhold at the current pace. The calculator above does both from your pay stub. If withholding falls short, you owe in April. If it runs over, you get a refund.
The extra amount you want withheld from each paycheck. If the calculator says you are short for the year, divide that shortfall by the paychecks you have left, which is exactly the number it shows. Write it on line 4(c) and give the form to your employer.
$2,200 for each qualifying child under 17, and $500 for each other dependent. The child amount went up from $2,000 under the One Big Beautiful Bill Act. Multiply, add the two together, and put the total in Step 3.
The most common cause is a second job or a working spouse. Each employer withholds as if its paycheck were your only income, so both start at the lowest tax rates. Stacked together your real income sits higher, and the combined withholding falls short. Step 2 exists to fix this.
Neither. The old allowance boxes are gone. The 2020 redesign replaced them with the steps you see today, so there is no 0 or 1 to claim. Use Step 3 for dependents and line 4(c) for extra withholding. Our claim 0 or 1 guide explains what replaced them.
It means you lent the government money all year without interest. Nothing goes wrong, but that money could have been in your paychecks. If your refund is large and predictable, lowering your withholding puts it back into your monthly budget.
Once a year is enough for most people, plus any time your life changes: marriage, divorce, a baby, a new job, a raise, or a spouse who starts or stops working. Checking early in the year gives the change more paychecks to work with.
No. Those are flat payroll taxes at 6.2% and 1.45% of your wages, and no W-4 entry changes them. Your W-4 only controls federal income tax withholding. To see the whole paycheck, use the take-home pay calculator.
Most states use their own form, not the federal W-4. This calculator covers federal tax only. For what your state takes out of each check, see the paycheck calculator, which covers all 50 states.
No, it is a careful estimate built on published 2026 federal rules. It does not know your credits, your itemized deductions, the new tips and overtime deductions, or anything your employer does differently. Use it to get close, then confirm with a tax professional if the numbers matter.

Getting your W-4 right

1. Handle Step 2 before anything else. If your household has two jobs, this is the step that decides whether you owe. Check the box in Step 2(c) on both W-4s when the pay is similar. See how Step 2 works.

2. Claim your dependents in Step 3. Every qualifying child under 17 is $2,200 off your withholding for the year. Only one spouse should fill in Step 3. The dependents guide covers who counts.

3. Use line 4(c) for fine tuning. It is the cleanest lever on the form. One number, applied every payday, moving you toward a small refund or a small bill instead of a surprise.

4. Redo it after any life change. Marriage, a baby, a divorce, a second job, or a raise all move your numbers. The life change guide lists what to update.

5. Check the result against your next pay stub. Withholding changes usually show up within one or two pay cycles. If the number did not move, ask payroll whether they received the new form.

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