How to Fill Out Your W-4 When Married Filing Jointly

To fill out a W-4 when married filing jointly, both spouses check the “Married Filing Jointly” box in Step 1, then coordinate so that only one W-4 — usually the higher earner’s — handles the two-income adjustment in Step 2 and the dependent credits in Step 3. Getting this coordination right is what keeps a household from owing money in April, because each employer otherwise assumes its paycheck is your only income and withholds too little. For 2026, married couples filing jointly get a standard deduction of $32,200, and a correctly completed W-4 spreads that benefit across your paychecks instead of trapping it in a refund.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026

You can get a blank W-4 from your employer’s payroll department or download the current version from the IRS website.2Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate Each spouse fills out their own form for their own employer. Nothing about the joint return itself happens on the W-4; the form only tells one employer how to withhold from one paycheck.

Step 1: Name, Address, and Filing Status

The top of the form asks for your full legal name, home address, and Social Security number. Check the “Married Filing Jointly” box for filing status. This tells your employer to apply the higher standard deduction when calculating withholding, which lowers the tax taken from each check compared to filing as single.3Office of the Law Revision Counsel. 26 USC 6013 – Joint Returns of Income Tax by Husband and Wife

If you recently married and changed your name, make sure the name on the W-4 matches what the Social Security Administration has on file. A mismatch can delay processing of your return later.

Step 2: Handling Two Incomes

Step 2 is where couples go wrong. When both spouses work, or one spouse holds a second job, each employer treats its paycheck as if it were the only income in the household. Each one applies the full standard deduction and starts you at the bottom of the tax brackets. Stack those two under-withholding paychecks together and the couple ends up short at tax time.

The IRS gives you three ways to fix this. Pick one.

  • Check the box in Step 2(c) if the two jobs pay roughly similar amounts. Both spouses check this box on their respective W-4s. It splits the standard deduction and brackets across the two jobs.
  • Use the Multiple Jobs Worksheet on page 3 of the W-4 if one spouse earns significantly more than the other. Look up the two salaries in the provided tables to find an extra dollar amount to withhold each pay period, and enter that amount on the higher earner’s W-4 in Step 4(c).4Internal Revenue Service. Form W-4 (2026) Employee’s Withholding Certificate
  • Use the IRS Tax Withholding Estimator at irs.gov/W4App for the most accurate result. You will need recent pay stubs for both spouses and records of any other income. The tool produces a specific dollar figure to enter on the form.5Internal Revenue Service. Tax Withholding Estimator

Whichever method you use, only one spouse enters the extra withholding amount. The other spouse’s W-4 either leaves Step 2 alone or simply checks the Step 2(c) box, depending on which method you picked. Doubling up here is a common mistake that leads to over-withholding.

If your withholding falls short of your actual tax, the IRS charges interest on the underpayment. The rate is variable; for the first quarter of 2026 it is 7%.6Internal Revenue Service. Quarterly Interest Rates Coordinating Step 2 correctly is the main way to avoid it.

Step 3: Dependents and Credits

Step 3 reduces your per-paycheck withholding to reflect credits you expect to claim on the return. The Child Tax Credit is worth up to $2,200 for each qualifying child under 17. Other dependents — children 17 or older, qualifying relatives — are worth up to $500 each.7Internal Revenue Service. Child Tax Credit Married couples filing jointly get the full credit amounts as long as combined adjusted gross income stays below $400,000. Above that, the credits phase out at 5% of the AGI over the limit.

Multiply your qualifying children by $2,200, add $500 for each other dependent, and enter the total on line 3.

Only one spouse should claim the dependents, and it should be the higher earner. If both spouses list the same children on their separate W-4s, the household will be under-withheld and will owe at filing time. The lower-earning spouse leaves line 3 blank.

Step 4: Other Adjustments

Step 4 is optional. Use it only if one of these applies:

  • Line 4(a) is for income that has no withholding of its own, like interest, dividends, or retirement distributions. Adding that income here makes your paycheck cover the tax on it.
  • Line 4(b) is for expected itemized deductions above the $32,200 standard deduction. If you plan to itemize mortgage interest, state and local taxes, and charitable contributions and the total will exceed the standard deduction, enter the difference. Your withholding drops to match the lower taxable income you actually expect to report.
  • Line 4(c) is for any extra flat dollar amount you want withheld each pay period. This is where the Step 2 worksheet result goes, and it is also where you would offset freelance or self-employment income if you would rather cover it through payroll than through quarterly estimated payments. The Tax Withholding Estimator can tell you how much to enter.4Internal Revenue Service. Form W-4 (2026) Employee’s Withholding Certificate

As with Step 3, coordinate. If both spouses enter the same 4(a) income or the same 4(b) deductions, you will double-count and throw off the withholding in opposite directions.

Step 5: Sign, Submit, and Verify

Sign and date the form in Step 5 and give it to your employer’s payroll or HR department. Many employers accept a W-4 through a secure online portal with an electronic signature.

Your employer must put the new withholding into effect no later than the start of the first payroll period ending on or after the 30th day from the date they receive it, which usually means one to two pay periods.8Internal Revenue Service. Topic No. 753, Form W-4 Employee’s Withholding Certificate Check the next couple of pay stubs. Confirm the filing status shows “Married Filing Jointly” and that any Step 3 or Step 4 amounts are reflected. If something looks off, call payroll before the next pay cycle rather than waiting until you file.

When to Redo Your W-4

A W-4 is not a once-and-done form. Redo it whenever a major event changes the household’s tax picture: getting married or divorced, having or adopting a child, buying a home, starting or ending a second job, or either spouse’s pay changing significantly.9Internal Revenue Service. Tax Withholding: How to Get It Right

Even without a life event, run the Tax Withholding Estimator once a year, ideally after your first pay stub of the new year arrives.5Internal Revenue Service. Tax Withholding Estimator Catching a mismatch in January gives your employer the full year to spread the correction across your remaining paychecks instead of hitting one check hard in the fall.