W-4 After a Major Life Change
Marriage, divorce, new baby — here's when your W-4 needs updating and exactly what to change.
By Reba Donaldson · Last reviewed: April 2026
You can update your W-4 anytime
There's no limit on how often you can submit a new W-4 to your employer. You can update it after any life change, and the new withholding takes effect with the next payroll cycle. Your employer must implement a new W-4 within 30 days of receiving it.
Getting married
What changes: Filing status, and potentially household income if your spouse works.
What to update: Change Step 1 to "Married filing jointly." If your spouse also works, complete Step 2 to account for the combined income. If you previously entered extra withholding because you were single, you may be able to reduce it.
When to do it: As soon as possible after the wedding.
Getting divorced or separating
What changes: Filing status, possibly dependents, possibly income.
What to update: Change Step 1 to "Single or Married filing separately" or "Head of household" if you have qualifying dependents and pay more than half the household costs. Update Step 3 to reflect the correct number of dependents you will claim.
When to do it: As soon as your filing status changes — ideally before the end of the calendar year.
Having or adopting a child
What changes: New dependent, possible Child Tax Credit eligibility.
What to update: Add the new child to Step 3. A child under 17 adds $2,000 to your Step 3 total, reducing your withholding by that amount spread across your remaining pay periods.
When to do it: After the birth or adoption is finalized.
Major income change
What changes: Tax bracket, withholding rate.
What to update: If you got a significant raise, your current withholding may be too low. If you were demoted or switched to part-time, it may be too high. Use our W-4 calculator to recalculate with your new income.
Large tax bill or large refund last year
A refund over $2,000 or a bill over $1,000 is a signal that your W-4 is off. Owed money? Increase withholding via Step 4(c). Got a large refund? Reduce withholding by adding dependents in Step 3 or removing extra withholding from Step 4(c).