How to Fill Out a W-4 for Married Filing Jointly

To fill out a W-4 for married filing jointly, check the “Married filing jointly” box in Step 1, coordinate Step 2 whenever either spouse works a second job or both spouses earn wages, list dependents on only one of your two W-4s in Step 3, use Step 4 for outside income or extra withholding, then sign in Step 5 and give the form to your employer. The form’s default assumes one job and the full $32,200 standard deduction for 2026, so a two-earner household that skips Step 2 will almost certainly under-withhold and owe in April.¹

Step 1: Personal Information and Filing Status

At the top of the form, enter your legal name, home address, and Social Security number. In line 1(c), check the box labeled “Married filing jointly.”² That checkbox tells payroll to apply the wider joint tax brackets and the full $32,200 standard deduction when calculating withholding.¹

If you don’t turn in a W-4 at all, your employer must withhold as if you were single with no other adjustments. That’s the harshest default, and it’s reason enough to hand in the form promptly.

Step 2: When Both Spouses Work or Either Holds a Second Job

Step 2 is the section that trips up most couples. Whenever the household has more than one income stream, each employer’s payroll system, left alone, applies the full $32,200 standard deduction to that job by itself. Two jobs shelter $64,400 instead of $32,200, withholding runs light on both checks, and the shortfall shows up at tax time.²

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

Option (a): The IRS Tax Withholding Estimator

The most precise route. You enter all income, deductions, and credits at irs.gov/W4App, and the tool returns a specific dollar figure to put on line 4(c). Use this option if either spouse has self-employment income, if you have children plus higher household income, or if the picture is at all complicated.

Option (b): The Multiple Jobs Worksheet

A paper worksheet on page 3 of the form. You look up wage ranges in a table, combine the numbers, and enter the result on line 4(c). It handles straight W-2 wages fine, but it doesn’t fold in credits and deductions the way the online estimator does.

Option (c): The Checkbox Method

The simplest route, but only when the household has exactly two jobs and the pay is roughly similar. Check the box in Step 2(c) on both spouses’ W-4s. Each employer then cuts the standard deduction and bracket widths in half for withholding purposes, which splits the joint math evenly between the two jobs.

The checkbox has a quiet advantage: it doesn’t require you to disclose any household income figures to either employer, which the worksheet and the estimator effectively do through the number you write on line 4(c).² The tradeoff is less precision. For two comparable salaries, the math lands close enough.

Step 3: Dependents (One Spouse Only)

Step 3 lowers your withholding to reflect two credits you’ll claim on the return: the Child Tax Credit and the Credit for Other Dependents. Only one of you should fill in Step 3. If both spouses claim the same children on their separate W-4s, combined withholding drops too far and you’ll owe.²

The math:

Line 3(a): multiply each qualifying child under 17 by $2,200.
Line 3(b): multiply each other dependent (older children, elderly parents, and so on) by $500.

Add the two and enter the total on line 3. Your employer divides that amount across the year’s pay periods.³

Watch the Phase-Out at $400,000

Both credits begin to phase out once combined adjusted gross income on a joint return exceeds $400,000.³ Entering the full amounts on Step 3 when you’re inside the phase-out band will over-reduce withholding. Run the IRS Tax Withholding Estimator instead; it applies the phase-out for you and returns a more accurate figure.

Step 4: Other Adjustments

Step 4 is optional and covers three situations the earlier steps don’t handle. Skip it if none apply.

Line 4(a): Non-Wage Income

Enter expected annual non-wage income here: interest, dividends, rental income, retirement distributions, and the like. Your employer spreads the extra withholding across your paychecks so you don’t have to send separate estimated payments for that income.² Don’t include wages from other W-2 jobs on this line; those belong in Step 2.

For larger or less predictable outside income, such as a freelance business or capital gains from selling property, quarterly estimated payments can work better than routing everything through W-4 withholding. The IRS treats both mechanisms the same for penalty purposes; what matters is that enough total tax reaches them during the year.⁴

Line 4(b): Deductions Beyond the Standard

If you plan to itemize or claim above-the-line adjustments like student loan interest or deductible IRA contributions, line 4(b) reduces your withholding to match. Use the Deductions Worksheet on page 3 of the form. It compares your expected deductions against the $32,200 joint standard deduction; if your itemized deductions plus adjustments exceed $32,200, the difference goes on line 4(b).² If they don’t exceed the standard deduction, leave 4(b) blank. Payroll already accounts for the standard amount.

Line 4(c): Extra Withholding Per Pay Period

A catch-all for anyone who wants more tax pulled from each check. If you used the Multiple Jobs Worksheet in Step 2(b), the result lands here. You can also use it when you know you typically owe and want to bump withholding by a fixed dollar amount each pay period. No cap.²

Step 5: Sign and Hand It to Your Employer

Sign and date the form. Your signature certifies the information is correct. Give the completed W-4 to your employer, not to the IRS. The employer uses it to calculate withholding on your next paychecks. The IRS can request copies but doesn’t receive W-4s automatically.⁵

When to Redo the W-4

You don’t have to file a new W-4 every year, but revisit it whenever the household picture shifts. Marriage or divorce, gaining or losing a dependent, one spouse starting or leaving a job, a meaningful change in non-wage income, or buying a home that pushes you into itemizing all warrant a fresh form.⁶

A useful habit is running the IRS Tax Withholding Estimator once a year after the first couple of January paychecks. If the projection is off by more than a few hundred dollars, file an updated W-4. Changes take effect the next payroll cycle after your employer processes the form, and you can update as often as you need.

Bonuses and Supplemental Pay

Your W-4 choices don’t control withholding on bonuses, commissions, or other supplemental wages the way they control regular paycheck withholding. Employers typically withhold a flat 22% on supplemental pay up to $1 million per employee per year, and 37% on anything above that threshold.⁷

That flat 22% may be too high or too low compared with your actual bracket. For 2026, joint filers sit in the 22% bracket between $100,800 and $211,400 of taxable income.¹ If combined income puts you well into the 24% or 32% bracket, 22% won’t cover the true tax on a large bonus. Compensate by raising line 4(c) or by making an estimated payment in the quarter the bonus lands.

Safe Harbors: Avoiding an Underpayment Penalty

If total withholding falls too far short of what you owe, the IRS charges an underpayment penalty. You can avoid it by meeting any one of these tests:

You owe less than $1,000 after subtracting withholding and credits.
Your total payments (withholding plus any estimated payments) cover at least 90% of this year’s tax.
Your total payments equal or exceed 100% of last year’s tax, regardless of what you end up owing this year. That threshold rises to 110% if last year’s joint adjusted gross income exceeded $150,000.

Meeting any one of these keeps you clear.⁸ The 110% rule is the one that catches higher-income couples off guard: if last year’s joint AGI was over $150,000, matching last year’s tax dollar-for-dollar isn’t enough this year.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Internal Revenue Service. Form W-4 (2026) Employee’s Withholding Certificate
3
Internal Revenue Service. Child Tax Credit
4
Internal Revenue Service. Pay As You Go, So You Won’t Owe: A Guide to Withholding, Estimated Taxes and Ways to Avoid the Estimated Tax Penalty
5
Internal Revenue Service. Topic No. 753, Form W-4 Employees Withholding Certificate
6
Internal Revenue Service. Managing Your Taxes After a Life Event
7
Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
8
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty