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Open the Calculator →To fill out the W-4: Step 1 enters your name, address, SSN, and filing status. Step 2 flags multiple jobs or a working spouse. Step 3 claims dependent credits ($2,200 per qualifying child under 17 for TY2026, $500 per other dependent). Step 4 enters other income, above-the-line deductions, or extra withholding. Step 5 is your signature. Submit the form to your employer - they do not send it to the IRS. The form has no expiration, but must be renewed annually if you claim Exempt.
- The 2020 W-4 redesign removed allowances entirely. Do not try to convert old allowances to the new form.
- Step 2 is the most commonly skipped step. Skipping it when you have multiple jobs causes underwithholding.
- Step 3 uses dollar amounts for dependent credits, not a count. Multiply qualifying children under 17 by $2,200 and other dependents by $500, then add them together.
- OBBBA deductions (tips, overtime premium, senior bonus) are entered in Step 4b as deductions - they reduce withholding proportionally to your bracket rate.
- Submitting a new W-4 mid-year adjusts withholding for the remaining pay periods only. Project forward, not backward.
- Your employer is required to honor your W-4 as submitted. They cannot question your entries unless the IRS instructs them to use a specific withholding rate.
What the W-4 Does and Why It Matters
IRS Form W-4 (Employee's Withholding Certificate) tells your employer how much federal income tax to withhold from each paycheck. Your employer uses the information to look up the withholding amount in IRS Publication 15-T. The withheld amounts are remitted to the IRS on your behalf and credited against your tax liability when you file your return.
If too little is withheld, you owe the difference when you file - and may owe an underpayment penalty if the gap is large enough. If too much is withheld, you get a refund, but that is an interest-free loan to the government. The goal is to withhold roughly what you owe.
The W-4 does not go to the IRS. It goes to your employer's payroll department. A new form takes effect as soon as your employer processes it, which must happen by the first payroll period ending at least 30 days after you submit it (though most employers apply it sooner).
Step-by-Step W-4 Instructions
The current W-4 has five steps. Steps 1 and 5 are required for everyone. Steps 2, 3, and 4 are completed only when they apply to you. Leaving Steps 2, 3, and 4 blank results in withholding as a single filer with no adjustments from that job.
Enter your legal name, home address, Social Security number, and filing status. Filing status choices on the W-4 are: Single or Married Filing Separately, Married Filing Jointly or Qualifying Surviving Spouse, and Head of Household.
Filing status matters because it determines which withholding table your employer uses. Married filing jointly uses a wider bracket table with lower withholding per dollar. Single uses a narrower table with higher withholding. Selecting the wrong status causes over- or underwithholding.
Common error: selecting Married Filing Jointly in Step 1 when your spouse also works, without completing Step 2. This causes significant underwithholding because each spouse's employer gives the full MFJ bracket treatment to each job independently, but you share one set of brackets at filing.
Complete Step 2 if you hold more than one job at the same time, or if you file jointly and your spouse works. This is the most important adjustment on the form for dual-income households.
You have three options:
- Option A - IRS Tax Withholding Estimator: Use the estimator at irs.gov/individuals/tax-withholding-estimator. It calculates the most accurate withholding across all jobs. Enter the result in Step 4c of the W-4 for the highest-paying job, and leave Steps 2, 3, and 4 blank on the other jobs' W-4 forms.
- Option B - Multiple Jobs Worksheet (Page 3): Use the worksheet in the W-4 instructions. Best when you cannot or prefer not to use the online estimator. Produces a withholding amount to enter in Step 4c.
- Option C - Checkbox: Check the box in Step 2(c). This tells your employer to use the Single withholding table for your pay, regardless of the Step 1 filing status. It is the simplest option and works best when all jobs pay similar amounts. It tends to overwithhold slightly when incomes are unequal.
Only one spouse should complete Steps 3 and 4 (use the higher-paying job's W-4). If you use Options A or B, you only need to complete Step 2 on the highest-paying job's form.
Step 3 reduces withholding by the dollar value of credits you expect to claim. Enter the total dollar amount - not a count of dependents.
- Qualifying children under age 17: Multiply the number of eligible children by $2,000 (the figure printed on the current W-4 form). Note: the OBBBA (P.L. 119-21) raised the Child Tax Credit to $2,200 per qualifying child for TY2025-2028. The IRS may update the W-4 form to reflect this. If you use the IRS Withholding Estimator, it will apply the correct TY2026 credit amount automatically.
- Other qualifying dependents: Multiply by $500 per dependent. This covers dependents who do not qualify for the full child credit (older children, elderly parents, other qualifying relatives).
- Add both amounts and enter the total in Step 3.
- Paying for childcare? The Child and Dependent Care Credit is claimed at filing on Form 2441, not through Step 3. To model whether to use a Dependent Care FSA (new $7,500 OBBBA limit, reduces W-4 withholding via Step 4b) or the CDCTC (claimed at filing), run the Child Care Tax Benefit Calculator or read the Dependent Care FSA vs Credit Guide.
Income limit: The Child Tax Credit phases out for higher incomes. For TY2026, the phase-out begins at $400,000 (MFJ) and $200,000 (all others) at a rate of $50 per $1,000 of income above the threshold. If your income exceeds these limits, reduce your Step 3 entry accordingly.
Only complete Step 3 on the highest-paying job's W-4 form if you have multiple jobs.
Step 4 has three sub-entries (a, b, c). All are optional. Use them to fine-tune withholding for income or deductions not captured elsewhere.
Step 4a - Other income: Enter annual income not subject to withholding that you want covered by this job's withholding. Common examples: interest and dividends, taxable IRA distributions, retirement pension income, rental income, and self-employment income from a side business. Entering this amount increases withholding to cover the estimated tax on that income.
Step 4b - Deductions: Enter deductions that will reduce your taxable income beyond the standard deduction. Compute using the Deductions Worksheet on page 3 of the W-4 instructions. This includes:
- Itemized deductions (Schedule A) in excess of the standard deduction for your filing status.
- Student loan interest, IRA deduction, or other above-the-line deductions (including OBBBA deductions - see the next section).
- The deduction amount reduces withholding: entering $10,000 here at a 22% marginal rate reduces annual withholding by approximately $2,200.
Step 4c - Extra withholding per period: Enter a fixed dollar amount to withhold from each paycheck in addition to the calculated amount. Use this when you owe taxes from prior years or have irregular income you did not account for in Steps 4a or 4b. Use a negative approach in 4b for reductions; this field is additions only.
Sign and date the form. The signature certifies that your withholding entries are accurate under penalty of perjury. An unsigned W-4 is not valid - your employer should return it to you for signature before processing.
You do not mail the W-4 to the IRS. Give it to your employer's payroll department or HR team. Keep a copy for your records.
Claiming Exempt: If you qualify to be exempt from withholding (no tax liability last year, none expected this year), write "Exempt" in the space below Step 4c and leave Steps 2, 3, and 4 blank. Sign and date. Exempt status expires February 15 of the following year - you must submit a new W-4 by that date to maintain it.
2026 Standard Deduction Reference
Your Step 4b entry is the amount by which your total deductions exceed the standard deduction. Knowing the standard deduction helps you determine whether you need to enter anything in Step 4b at all. If your deductions are below the standard deduction, leave Step 4b blank - the withholding tables already account for the standard deduction.
| Filing Status | 2026 Standard Deduction | Step 4b Entry |
|---|---|---|
| Single / MFS | $16,100 | Itemized deductions minus $16,100 (if positive) |
| Married Filing Jointly / QSS | $32,200 | Itemized deductions minus $32,200 (if positive) |
| Head of Household | $24,150 | Itemized deductions minus $24,150 (if positive) |
The 2026 standard deduction amounts reflect IRS Rev. Proc. 2025-32, which adjusted figures for inflation and incorporates the OBBBA changes effective for TY2025 onward. If you are age 65 or older, add the age 65+ add-on ($2,050 for single/HOH, $1,650 per eligible spouse for MFJ) and the OBBBA $6,000 senior bonus deduction to your total deduction estimate.
OBBBA Impact on W-4 Withholding
The One Big Beautiful Bill Act (P.L. 119-21, effective TY2025-TY2028) created three above-the-line deductions that directly reduce taxable income. Each one can reduce the amount your employer withholds. Enter estimated annual amounts from these deductions in Step 4b of your W-4.
No Tax on Tips - IRC Section 224
Qualifying tip income earned by workers in tip-eligible occupations is deductible as an above-the-line deduction under IRC Section 224 for TY2025-TY2028. If you receive tips as part of your regular job duties in a tipped occupation, estimate your annual qualifying tip income and enter that amount in Step 4b alongside any other deduction entries.
Annual cap: $12,500 (single/HOH/MFS) or $25,000 (MFJ/QSS). Phase-out applies at higher income levels. If your income exceeds these thresholds, consult a tax professional before reducing withholding significantly - the phase-out may reduce or eliminate your benefit.
Your employer already withholds payroll taxes (Social Security, Medicare) on tips. The OBBBA deduction affects only the federal income tax withholding portion, not payroll taxes.
No Tax on Overtime - IRC Section 225
The overtime premium - the extra 0.5x portion of the 1.5x overtime rate - is deductible under IRC Section 225 for TY2025-TY2028. Only the premium portion is deductible, not the entire overtime paycheck. For example, if you earn $30/hour regular pay and $45/hour for overtime, the deductible amount is $15/hour (the premium) times your overtime hours.
Annual cap: $12,500 (single/HOH) or $25,000 (MFJ). Phase-out begins at $150,000 (single) or $300,000 (MFJ). To adjust your W-4, estimate your annual overtime premium for the year and enter that amount in Step 4b. If you work variable overtime, use a conservative estimate and revisit mid-year.
Like the tips deduction, this reduces income tax withholding only. FICA taxes apply to all wage income, including overtime.
Senior Deduction (Age 65+) - OBBBA Section 70103
Taxpayers age 65 or older receive an additional $6,000 above-the-line deduction under OBBBA Section 70103 for TY2025-TY2028. For MFJ where both spouses are 65+, the deduction is $12,000 combined. MFS filers are not eligible.
Phase-out: begins at $75,000 (single/HOH) or $150,000 (MFJ), at a rate of $60 per $1,000 of income above the threshold, and is fully phased out at $175,000 (single/HOH) or $250,000 (MFJ).
If you qualify for the full or partial senior deduction, add it to your Step 4b total. Combined with the age 65+ standard deduction add-on ($2,050 single, $1,650 per spouse for MFJ), retirees with modest income may significantly reduce or eliminate their withholding obligation for the year.
Common W-4 Mistakes
These are the most frequent errors that cause underwithholding penalties or unnecessarily large refunds.
- Skipping Step 2 in a dual-income household. Both employers apply the standard deduction and lower MFJ brackets as if each job is your only income. At filing, you share one set of brackets and one standard deduction across the combined income. The result is often a tax bill, not a refund.
- Claiming dependents on both spouses' W-4 forms. If both you and your spouse complete Step 3 independently, each employer reduces withholding by the full credit amount. The total reduction becomes twice the allowable credit. Only one spouse should claim dependents - on the higher-paying job's W-4.
- Not accounting for significant non-wage income. Freelance income, rental income, large capital gain distributions, taxable retirement distributions, and taxable Social Security are not subject to employer withholding. Without a Step 4a entry or estimated tax payments, all the tax on this income is due at filing.
- Overstating deductions in Step 4b. Entering a Step 4b amount larger than your actual expected deductions reduces withholding below what you owe. If the shortfall exceeds $1,000 and certain thresholds, the IRS may assess an underpayment penalty (Form 2210).
- Failing to update the W-4 after major life changes. Marriage, divorce, a new child, a raise, or starting a second job all change your tax liability. A W-4 submitted during a very different financial situation may produce the wrong withholding years later.
- Using old allowance numbers on the new form. The new W-4 has no allowances. Trying to apply a number from a pre-2020 form is not meaningful. Start fresh using the current instructions.
When to Submit a New W-4
Your W-4 stays in effect indefinitely. Submit a new one when:
- You got married or divorced.
- Your spouse started or stopped working.
- You had or adopted a child.
- You started a second job or stopped a second job.
- You received a significant raise or pay cut.
- You started or stopped receiving significant non-wage income.
- You bought a home and now have a mortgage interest deduction.
- You turned 65 and now qualify for the OBBBA senior deduction.
- You claimed Exempt and need to renew by February 15.
- You owed a large amount or received an unexpectedly large refund at filing.
- New tax law significantly changed your estimated liability (such as the OBBBA changes effective TY2025).
A new W-4 submitted mid-year adjusts withholding only for remaining pay periods. The IRS expects you to have withheld enough by December 31, not to have withheld evenly throughout the year. Submitting a new W-4 in October that asks for high withholding can close a gap - it just has fewer pay periods to work across.
Practitioner Insight
The Step 2 issue accounts for the majority of unexpected tax bills I see in dual-income married households. Both spouses select MFJ in Step 1 and leave Step 2 blank. The employer applies the full MFJ bracket table to each paycheck independently - correct in isolation, but the combined income at filing uses one set of brackets, which typically puts the household in a higher bracket than either employer assumed. I recommend using the IRS Withholding Estimator at the start of each year if either spouse changes jobs or if combined income changes materially.
For tipped and overtime-eligible workers in 2026, I am seeing a lot of confusion about what to enter in Step 4b for OBBBA deductions. The key rule: enter the annual amount of the deduction you expect to qualify for. If you receive $15,000 in qualifying tips and your income is within the phase-in range, enter $15,000 in Step 4b (adding it to any other deduction entries). The calculator then reduces your withholding by $15,000 times your marginal rate. Do not enter the tax savings amount - enter the deduction amount.
When Standard W-4 Entries Do Not Produce Accurate Results
- Self-employment income alongside wages: the W-4 Step 4a entry covers expected SE profit, but self-employment tax (15.3% on net SE income) is not offset by wage withholding. Estimated tax payments may still be needed alongside a W-4 adjustment.
- Large capital gain distributions from mutual funds in late November or December: these are often unpredictable and arrive too late to adjust withholding. Use estimated tax payment vouchers (Form 1040-ES) for these.
- First-year new employee mid-year: if you start a job mid-year with no prior income, your annual withholding is annualized from the partial year's pay periods. This can produce higher withholding than your actual full-year tax. Entering the Part-Year Employment method in the W-4 instructions (Step 2 area) may help.
- OBBBA deductions that phase out: if your income is near or above the phase-out threshold for tips, overtime, or the senior deduction, the deduction amount varies with actual income. Entering a full-year estimate at the beginning of the year may overstate your deduction if income grows.
- Married filing separately elections: MFS is not on the W-4 as its own bracket table. Use the Single withholding table and adjust via Step 4a for any income gap, or use the IRS estimator.
What To Do Next
Use the W-4 Withholding Calculator to project your annual tax from your current pay stub, compare it to your projected withholding, and calculate your withholding gap. The calculator handles OBBBA deductions, age 65+ add-ons, and dependent credits with the 2026 bracket tables.
If you are unsure which filing status to select in Step 1, use the Filing Status Calculator to determine whether MFJ, MFS, HOH, or Single produces the lowest tax. The choice on your W-4 does not lock your return filing status, but it should match your expected return status for accurate withholding.
If you have significant self-employment or other non-wage income, you may need quarterly estimated tax payments alongside your withholding. Use the Estimated Tax Penalty Calculator to check whether you are on track to meet the safe harbor (90% of current year tax or 100% of prior year tax).
Related Tools and Guides
Frequently Asked Questions
- IRS Form W-4 (2025 edition) - Employee's Withholding Certificate - irs.gov/pub/irs-pdf/fw4.pdf
- IRS Publication 505 (2026) - Tax Withholding and Estimated Tax - irs.gov/pub/irs-pdf/p505.pdf
- IRS Publication 15-T (2026) - Federal Income Tax Withholding Methods - irs.gov/pub/irs-pdf/p15t.pdf
- IRS Tax Withholding Estimator - irs.gov/individuals/tax-withholding-estimator
- IRS IR-2025-103 (October 9, 2025) - 2026 Tax Adjustments (Rev. Proc. 2025-32) - irs.gov/newsroom
- IRC Section 3402 - Income Tax Collected at Source (withholding requirements)
- One Big Beautiful Bill Act (OBBBA), P.L. 119-21, signed July 4, 2025 - IRC Sections 224, 225, OBBBA Section 70103
- IRS Notice on CTC OBBBA update - Child Tax Credit $2,200 per qualifying child TY2025-2028