Quick Answer

Federal income tax withholding per paycheck is calculated by annualizing your per-period wages, subtracting your standard deduction ($15,000 single / $30,000 married), applying 2026 marginal rates, then dividing by pay periods. If your paycheck withholding × periods ≠ your actual tax liability, you'll owe or get a refund.

Tax Withholding Calculator 2026

Estimate your federal income tax withholding per paycheck — and see if you're on track to break even at tax time.
Based on IRS Publication 15-T. 2026 brackets.

Last updated: September 2026 — rates sourced from IRS Publication 15, SSA & state revenue departments
Enter Your Details2026 Rates
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Step 4(c) on your W-4
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Side income, freelance, investment income

Understanding federal tax withholding in 2026

Federal income tax withholding is the portion of each paycheck sent to the IRS on your behalf. Your employer calculates it using instructions from IRS Publication 15-T (Percentage Method Tables for Automated Payroll Systems).

The 2026 standard deductions — $15,000 for single filers, $30,000 for married filing jointly — are baked directly into the withholding tables, so you automatically benefit without itemizing. Only income above these thresholds is subject to withholding.

The calculator here estimates withholding based on the standard W-4 assumptions. For the full picture including multiple income sources, use the Payroll Tax Calculator or consult the IRS Tax Withholding Estimator at irs.gov/W4app.

Withholding EstimatePer Paycheck

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Disclaimer: Results are estimates based on 2026 IRS and published government rates. Not a substitute for licensed payroll software or professional tax or financial advice.

FAQ

Tax Withholding Calculator questions answered

The IRS uses the "percentage method" in Publication 15-T. Employers multiply your per-paycheck gross wages by the number of pay periods per year to annualize income. They subtract your W-4 standard deduction ($15,000 single, $30,000 married in 2026), apply marginal tax bracket rates to the remainder, then divide the annual tax back to a per-paycheck amount. Any additional withholding you request on Step 4(c) of your W-4 is added on top.
A large refund means you over-withheld — you gave the government an interest-free loan. To reduce over-withholding, submit a new W-4 to your employer: on Step 3, claim child tax credits ($2,000 per qualifying child); on Step 4(b), add estimated deductions if you itemize; reduce Step 4(c) additional withholding if you previously added it. The IRS Tax Withholding Estimator at irs.gov helps calculate the exact adjustment.
The safe harbor rule says you won't owe a penalty if your withholding covers at least 90% of your current year's tax liability, or 100% of last year's liability (110% if last year's AGI exceeded $150,000). If you have significant non-wage income (freelance, investments, rental), consider making quarterly estimated tax payments in addition to paycheck withholding.
Step 2(c) should be checked if you have multiple jobs simultaneously, or if you and your spouse both work. Without it, each employer withholds as if that job is your only income — but two incomes combined may push you into a higher bracket. Checking Step 2(c) instructs withholding at the higher "single" rate table, preventing a large year-end tax bill from combined income.

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