Tax Withholding Calculator
Estimate federal paycheck withholding from wages, filing status, and W-4-style settings so you can aim for a small refund or a small balance due. Planning only.
Federal Income Tax Guide HubWritten and reviewed by
Informational only — not a substitute for a tax, legal, or investment professional who knows your facts. About the publisher
Estimate how much federal income tax should come out of each paycheck so you are not staring at a four-figure bill in April or a four-figure refund you did not mean to make. This is a planning calculator, not the IRS estimator and not a substitute for Publication 15-T.
What tax withholding actually is
Withholding is an installment plan. Your employer sends the IRS a slice of each paycheck using the Form W-4 you gave payroll and the IRS percentage method (or wage-bracket method) in Publication 15-T. At filing time, that total is credited against the tax on Form 1040.
If withholding is short, you owe the rest — and you can owe an underpayment penalty if the shortfall is large enough and you do not qualify for a safe harbor. If withholding is high, you get a refund. A refund is not a prize. It is your money returned without interest.
FICA (Social Security and Medicare) is a separate line. This page is about federal income tax withholding. For the full stub — FICA, state, pre-tax benefits — use the paycheck after-tax calculator on the payroll tax hub.
The “just right” target
There is no official perfect number. A practical target for most W-2 households is:
- A refund under a few hundred dollars, or
- A balance due you can pay without scrambling, still inside the estimated-tax safe harbor if you owe.
Too little withholding shows up as a surprise bill, a possible Form 2210 penalty, and a need to raise extra withholding or make estimated payments. The quarterly estimated tax guide covers 1099 and side-income cases.
Too much withholding shows up as a $2,000–$4,000 refund. That cash could have paid down a card, funded an IRA, or sat in a high-yield account during the year.
Run this calculator when you change jobs, when a spouse starts or stops working, or when OBBBA deductions (tips, overtime, senior extra deduction, car-loan interest) change your expected tax. Those items live on the Working Families Tax Cuts hub.
How the W-4 drives the math
The current W-4 no longer uses “allowances.” It asks for:
- Filing status
- Multiple jobs or a working spouse (Step 2)
- Qualifying children and other dependents (Step 3)
- Other income, extra deductions, and extra withholding (Step 4)
Payroll annualizes your wage, subtracts the standard deduction implied by filing status, accounts for the credits and extra withholding you listed, then applies the percentage method. A second job without Step 2 checked is the classic underwithholding trap: each employer thinks it is your only job and withholds as if you were in a lower bracket.
If you want the annual tax picture rather than the per-paycheck slice, use the federal tax bracket calculator with an estimate of taxable income after the standard deduction.
Safe harbors, in plain language
You generally avoid the federal underpayment penalty if withholding plus timely estimated payments is at least:
- 90% of the current year’s tax, or
- 100% of last year’s tax (110% if last year’s AGI was over $150,000, or $75,000 if married filing separately)
High earners who got a large bonus or sold a business often fail the 90% test and should lean on the prior-year safe harbor. That is a W-4 extra-withholding problem or a Form 1040-ES problem, not a bracket-table problem.
Bonuses are often withheld at the 22% supplemental rate, which can look “too high” in a low bracket and “too low” in a 32%+ bracket. Model that on the bonus tax calculator.
When a new W-4 is worth the paperwork
File a new W-4 with your employer when:
- You marry or divorce, or a spouse’s job changes.
- You start a second job or gig that is still W-2.
- You have a child (credits change Step 3).
- You buy a house and will itemize, or you stop itemizing.
- You exercise ISOs or have a large capital gain this year — extra withholding or estimates may be safer than hoping the W-2 job covers it. See the ISO tax calculator and AMT calculator.
- Congress changes deductions you actually use (OBBBA senior extra amount, overtime, tips). Recheck rather than assuming last year’s W-4 still fits.
Remote workers who moved states have a state W-4 / residency problem as well. Federal withholding will not fix a two-state mess.
Side income and household help
W-2 withholding does not cover:
- 1099 contracting — use the 1099 tax calculator and usually quarterly estimates.
- A profitable side hustle on top of a salary — the day job W-4 can be raised (Step 4 extra withholding) to cover the gig, which is often easier than four estimated vouchers.
- Household employees if you are the employer.
If the side income is large, do not hide it inside a “close enough” W-4. Run annual tax on the bracket tool, subtract what the W-2 job will withhold, and put the gap on Step 4(c) or on 1040-ES.
How to read the output
Treat the per-paycheck figure as a direction, not as a cent-level IRS promise. Employers use IRS tables, rounding, and pay-frequency conventions this page may simplify.
- Compare the suggested withholding with your current stub’s federal income tax line (not FICA, not state).
- If you are far below, add extra withholding or make estimates.
- If you are far above, reduce extra withholding or revisit Step 3 credits so you are not over-claiming.
- Recheck after the first paycheck that uses the new W-4. Payroll errors happen.
For the line-by-line stub, including FICA and state, stay with how to calculate a paycheck after taxes.
Two-earner households
The most common underwithholding pattern is two W-2 jobs treated as if each were the only job. Step 2 of the W-4 exists for that. Checking it raises withholding on each job. Leaving it blank on both jobs is how dual-income couples get a spring bill even when each stub “looks fine.”
A more precise approach: estimate combined annual tax on the federal tax bracket calculator after the standard deduction, subtract what both employers already withhold, and put the remainder on one job’s Step 4(c). That avoids both jobs over-withholding because each applied the Step 2 checkbox.
If one spouse has a 1099 practice and the other has a W-2 job, it is often cleaner to raise W-2 extra withholding than to write four estimated checks. The 1099 tax calculator tells you the annual gap; this page tells you how much extra to take per paycheck to fill it.
New job, first stub, and catch-up
A January start date is easy: 12 months of withholding. A September start date is not. Publication 15-T annualizes current wages as if you earned them all year, which can under-withhold for someone who already earned a lot at a prior employer. Enter year-to-date wages from the old W-2 plus the new job when you plan, or put extra withholding on Step 4(c) for the rest of the year.
Moving from a no-tax state to a high-tax state mid-year creates a state catch-up the federal W-4 will not solve. Use the state taxes hub for that layer.
How to use this calculator
Enter the same filing status you will use on Form 1040, the wage that will appear on the W-2 (not net pay), and pay frequency. If you have two jobs, either use the Step 2 logic described above or enter combined wages and treat the output as a household target to split between employers.
Compare the suggested federal income-tax line with a recent stub. Ignore Social Security, Medicare, state, and benefits when you make that comparison. If you are within a few dollars, you are done. If you are off by more than a few hundred dollars a year, change the W-4 and verify the next paid check. Keep the old W-4 PDF until you see the new amount actually hit. Payroll implementations lag a cycle more often than people expect, especially after a mid-month status change. If two cycles pass with no change, email payroll with the date you submitted the form rather than filing a third W-4 in a panic. None of this is a filed return. Print or screenshot the output if you want a record; we do not save your wages.
Informational use only
Withholding tables, W-4 instructions, and penalty rules change. This calculator does not file a W-4, bind your employer, or guarantee you will avoid a balance due or a penalty. Confirm with current IRS Publication 15-T, the IRS withholding estimator, and a tax professional when the dollars are material.
Failure-to-pay on an original 1040 is a different penalty from estimated-tax underpayment. The 2026 IRS Automatic Exemption from Penalty program is not a W-4 safe harbor. If a failure-to-file or failure-to-pay notice arrives, map it against published AEP rules with the AEP eligibility checker.
Related: payroll tax hub, paycheck after-tax calculator, federal tax bracket calculator, federal income tax hub.