W-4 Withholding Calculator 2026

What is W-4 withholding?

A W-4 tells your employer how much federal income tax to withhold from your paycheck. A W-4 withholding calculator estimates whether those paycheck deductions may cover your tax for the year.

Your withholding is a prepayment, not your final tax bill. When you file your tax return, the amount withheld is compared with your actual tax. Withholding above your tax may contribute to a refund; withholding below it may leave you with a balance to pay.

Why a tax withholding calculator matters

Your withholding affects the money you receive in each paycheck and the amount you may owe or get back when you file. Checking your estimate can help you decide whether to change your W-4, rather than wait until tax filing to discover a gap.

A large projected shortfall may lead you to request additional withholding on line 4(c). If the calculator shows projected over-withholding, you can review your W-4 and decide whether a change makes sense for your cash flow. This calculator is an estimate, not a substitute for your full tax return or the IRS Tax Withholding Estimator.

Because this is a tax estimate, confirm your W-4 choices with a qualified tax professional if your circumstances are complex.

How to use this W-4 calculator

1. Choose your filing status and enter your expected 2026 wages. Use your best estimate for the full year, not just the amount on your latest paycheck.
2. Enter other income and pre-tax deductions. Include itemized deductions only if you expect to use them; enter 0 to use the standard deduction in this calculator.
3. Enter the number of children under 17, if any. The calculator uses the child credit in its tax estimate.
4. Enter your federal tax withheld so far and the federal tax withheld from each paycheck. Use federal income tax withholding, not Social Security or Medicare deductions.
5. Enter how many paychecks remain this year. The calculator adds your withholding so far to your per-paycheck withholding multiplied by the remaining paychecks.
6. Review the projected tax and projected total withholding. If there is a projected shortfall, the calculator divides it across your remaining paychecks to estimate the extra amount to withhold. Review your W-4 and confirm any change with a qualified tax professional if needed.

W-4 calculator example

How to read your withholding results

Projected tax is the calculator’s estimate of your federal tax for 2026, using 2026 brackets, the standard deduction and the child credit. Your actual tax may differ because a calculator estimate cannot account for every detail of a tax return.

Projected total withholding is withheld so far plus the amount expected from the paychecks left this year. If that estimate is below projected tax, the difference is a projected shortfall. If it is above projected tax, the difference is projected over-withholding. Neither result guarantees what you will owe or receive after filing.

How to improve your W-4 withholding estimate

1. 01

   Use current pay information

   Check a recent pay statement for federal income tax withheld and the amount taken from each paycheck. Update the figures if your pay or withholding has changed.

2. 02

   Refresh your estimate after a change

   Recheck the calculator if your wages, other income, pre-tax deductions or filing status changes. A new estimate can help you decide whether your current W-4 still fits.

3. 03

   Spread a shortfall across remaining paychecks

   If the estimate shows that withholding may fall short, use the calculator’s per-paycheck estimate as a starting point for reviewing line 4(c). Confirm the amount and your broader W-4 choices with a qualified tax professional when needed.

4. 04

   Check the assumptions

   The calculator uses the standard deduction unless you enter itemized deductions. Compare that assumption with your expected tax situation and use the IRS Tax Withholding Estimator for a more detailed review.

Common W-4 calculator mistakes

• Entering year-to-date pay as annual wages

  Expected wages should represent your estimate for the full year. Entering only wages earned so far can make the projected tax misleading.

• Counting every payroll deduction as federal tax

  Use the federal income tax withheld amount. Social Security, Medicare and other deductions are different items and should not be added to it.

• Forgetting paychecks already received

  Enter federal tax withheld so far separately from withholding per paycheck. The estimate combines the amount already withheld with projected withholding from the paychecks left.

• Treating an estimate as a guaranteed refund

  The result depends on the figures and assumptions entered. Your final tax may differ, so review your full tax picture before changing your W-4.

The W-4 withholding formula

Key terms

W-4

The form you give your employer to set federal income tax withholding from your paycheck.

Withholding

Federal income tax taken from your paycheck and sent toward your tax for the year.

Line 4(c)

The W-4 line used to request additional federal income tax withholding from each paycheck.

Projected over-withholding

The estimated amount by which total withholding exceeds projected tax. It may contribute to a refund, but is not a guaranteed refund amount.