You don’t update a W-2 after marriage. Your employer generates that form from payroll records at year-end, and you never fill it out yourself. The form you actually need to update your W-4 after marriage is the one that tells your employer how much federal income tax to withhold from each paycheck. The IRS expects a newly married employee to give their employer a revised W-4 within 10 days of the wedding.1Internal Revenue Service. Tax To-Dos for Newlyweds to Keep in Mind Skip that step and you can end up under-withheld for months, with a surprise bill and possible penalty at tax time.
W-4 and W-2 Are Not the Same Form
Both start with “W” and both relate to taxes, which is where the confusion comes from. They move in opposite directions. The W-4 goes from you to your employer and tells payroll how much federal income tax to withhold based on your filing status, other jobs, dependents, and any extra withholding you want.2Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate You can submit a new one any time your situation changes.
The W-2 goes the other way. Early each year, your employer sends you a W-2 summarizing the wages you earned and the taxes withheld during the previous calendar year, and you use it to file your return.3Internal Revenue Service. Topic No. 752, Filing Forms W-2 and W-3 You don’t fill it out, and you don’t edit it. If a W-2 arrives with the wrong name after you’ve married, the fix is updating your records with the Social Security Administration and your employer’s payroll department, not changing the form.
How to Submit a New W-4
Get a blank W-4 from your employer’s payroll or HR team, or download it from the IRS website. The change that matters most is in Step 1(c), where you select your anticipated filing status. Most married couples pick Married Filing Jointly, which applies a larger standard deduction and wider brackets to the withholding calculation.4Internal Revenue Service. Form W-4, Employee’s Withholding Certificate
After you turn it in, check the next two or three pay stubs to confirm the withholding amount actually changed. Payroll mistakes happen, and catching one in February is far easier than finding it the following April.
If You Both Work, Read Step 2 Carefully
This is where newly married couples most often get into trouble. When both spouses work, each employer withholds as if that paycheck were the household’s only income. Neither one takes out enough, and the couple ends up owing at tax time. Step 2 of the W-4 gives you three ways to close that gap.4Internal Revenue Service. Form W-4, Employee’s Withholding Certificate
- The IRS Tax Withholding Estimator at irs.gov/W4App is the most accurate option. You enter income, deductions, and credits for both spouses and it tells you exactly what to put on each W-4. It’s especially useful if either spouse has self-employment income or more than one job.5Internal Revenue Service. Tax Withholding Estimator
- The Multiple Jobs Worksheet on page 3 of the W-4 has you look up your combined income in a table and enter the result as extra withholding in Step 4(c). Less precise than the online estimator, but it works without internet access.
- The checkbox method in Step 2(c) works when the household has exactly two jobs. Both spouses check the box on their respective W-4s, which splits the standard deduction and brackets in half for each job. It works best when the two jobs pay roughly the same.
Whichever method you use, claim dependents and additional deductions on only one W-4, ideally the one tied to the higher-paying job. Claiming them on both forms causes under-withholding.4Internal Revenue Service. Form W-4, Employee’s Withholding Certificate
Your Filing Status Is Set on December 31
Your marital status on the last day of the tax year determines your filing status for the whole year.6Internal Revenue Service. Filing Status A wedding any time between January 1 and December 31 means the IRS treats you as married for that entire year. You cannot file as Single for the year you marry, even if the wedding was on New Year’s Eve.
As a married couple you have two options: Married Filing Jointly or Married Filing Separately. Filing jointly almost always produces a lower tax bill. Joint filers get a $32,200 standard deduction for 2026, compared with $16,100 each for those filing separately.7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Joint filers also qualify for education credits like the American Opportunity Tax Credit, the student loan interest deduction, and more favorable income thresholds for IRA contributions, all of which are reduced or eliminated when filing separately. Filing separately makes sense in narrow situations, such as when one spouse has significant medical expenses or you want to keep liability for each other’s tax debts separate. Choose the status you’ll actually use on your return and put it on the W-4; the two should match.
What Happens If You Don’t Adjust Your Withholding
If you ignore the W-4 and end up significantly under-withheld, the IRS charges an underpayment penalty based on how much you owe and how long the underpayment lasted.8Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty Interest accrues on top of the penalty until the balance is paid.
You avoid the penalty if your return shows you owe less than $1,000, or if you paid at least 90% of your current-year tax or 100% of last year’s tax, whichever is smaller. If your adjusted gross income is above $150,000 ($75,000 if filing separately), the prior-year test rises to 110%.8Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty Those safe harbors are worth knowing: a mid-year marriage without an immediate W-4 update won’t automatically trigger a penalty, as long as your total payments stay close to one of those marks.
State Withholding Is a Separate Form
Updating the federal W-4 does not update your state income tax withholding. Most states that tax income use their own form. California uses the DE 4, New York the IT-2104, Illinois the IL-W-4, and so on. A few states piggyback on the federal W-4, and nine have no income tax at all. Ask your employer’s payroll department which form your state uses and submit a new one reflecting your new marital status.
Name Change with Social Security
If you’re taking your spouse’s last name or hyphenating, update your name with the Social Security Administration before updating it anywhere else. The SSA ties your name to your lifetime earnings record, which drives your future Social Security benefits.9Social Security Administration. Review Record of Earnings More immediately, the name and Social Security number on your tax return must match SSA records, or the return can be delayed or rejected when e-filed.10Internal Revenue Service. Name Changes and Social Security Number Matching Issues
If filing season arrives before the SSA change is complete, file under your former name to avoid the mismatch.10Internal Revenue Service. Name Changes and Social Security Number Matching Issues
How to Update Your Name
Depending on your situation, the SSA may let you request the change online through your my Social Security account.11Social Security Administration. Change Name with Social Security If the online option isn’t available to you, fill out a paper Form SS-5 (Application for a Social Security Card) and bring or mail it with your supporting documents.12Social Security Administration. How Do I Change or Correct My Name on My Social Security Number Card
You’ll need proof of identity, such as a U.S. driver’s license or passport, plus proof of the name change, typically your marriage certificate. Every document must be an original or a certified copy issued by the agency that created it; the SSA does not accept photocopies or notarized copies.13Social Security Administration. Application for Social Security Card Order several certified copies of your marriage certificate from the county or state that issued it, since the DMV, your bank, and other agencies will each want to see one.