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Tax

Tax Withholding Calculator

Enter your salary, filing status, and allowances to estimate federal income tax and whether you'll get a refund or owe more.

Updated July 2026 · Figures verified July 2026 (sources) · Editorial standards

Estimated amount you owe
$946
Estimated tax liability
$7,670
Effective tax rate
10.2%
Income$75,000Withheld (est.)$6,724Allowances1Extra per paycheck$0

Your withholding details

$
allowances
$

You may owe $946. Consider increasing withholding or making estimated payments.This is an estimate using current federal tax brackets and standard deductions. State taxes, credits, deductions, and AMT are not included. Consult a tax professional for accuracy.

You owe
$946
By KalkWiseVerified against official sources Updated July 2026

What is the tax withholding calculator — w-4 refund or amount owed?

In short

Tax withholding is set via your W-4 form. A single filer earning $75,000 owes approximately $7,670 in federal income tax under 2026 brackets (10.2% effective rate); claiming 1 allowance withholds about $6,724, leaving roughly $946 owed at filing. Over-withholding gives you a refund; under-withholding means you owe at filing.

Estimates your federal income tax and projects whether you'll receive a refund or owe money at tax time based on income, filing status, and W-4 allowances.

How to use this calculator

  1. 1Enter your annual salary.
  2. 2Select filing status (1=Single, 2=Married Filing Jointly, 3=Head of Household).
  3. 3Enter W-4 allowances (0 = maximum withholding, higher = less withheld).
  4. 4Add extra per-paycheck withholding if you want to close a projected gap.
  5. 5Compare estimated tax vs. estimated withholding to see your projected refund or balance due.

The formula

taxable=income−std deduction−allowances
refund=withheld−tax liability
Tax liability uses Taxable Income = I − D (allowances never reduce your actual tax). Withholding applies the same brackets to I − D − (A × allowances), so each allowance lowers what is withheld, not what you owe; Tax = bracket calculation on taxable income; Refund = Withholding − Tax
I
— Total income
D
— Standard deduction
A
— Allowance value ($4,300 each)

Worked example

The scenario

Single filer, $75,000 salary, 1 allowance, standard deduction.

gives

The result

Tax liability: ~$7,670 on $58,900 taxable ($75,000 − $16,100 standard deduction); effective rate 10.2%. Withholding with 1 allowance: ~$6,724 (brackets applied to $54,600 after the $4,300 allowance) — projecting ~$946 owed at filing. Claiming 0 allowances instead would withhold ~$7,670 — matching the liability.

Common use cases

  • Verify if your W-4 withholding is set correctly.
  • Decide how many allowances to claim to minimize refund (interest-free loan to IRS) or avoid underpayment.
  • Estimate tax impact of a raise or new job.
  • Plan for tax owed if you have side income not subject to withholding.

Limitations & assumptions

  • Federal income tax only — does not include FICA (7.65%), state income tax, or local taxes.
  • Does not model tax credits (child tax credit, earned income credit, education credits).
  • Uses 2026 brackets; brackets adjust annually for inflation.
  • Models the pre-2020 W-4 allowance system as a simple withholding proxy — the current W-4 uses dollar amounts (Steps 2–4), so for an exact answer use the IRS Tax Withholding Estimator.
  • For accurate withholding, also consult the IRS withholding estimator at irs.gov.

Frequently asked questions

Claiming 0 maximizes withholding (larger refund, less take-home pay). Claiming 1 if you're single and have one job usually withholds about the right amount. Claiming more reduces withholding — fine if you want more take-home but risky if you have other income.

Disclaimer: KalkWise calculators are provided for general informational and educational purposes only and do not constitute financial, investment, tax, or legal advice. Results are estimates based on the figures you enter and the assumptions described above. Actual outcomes will vary. Consult a qualified professional before making financial decisions.