W-4 Withholding Calculator 2026: IRS Tax Withholding per Paycheck

How to use this 2026 W-4 calculator

Enter federal taxable wages from one paycheck and choose the payroll frequency. Use federal taxable wages after eligible pre-tax deductions, rather than your bank deposit or a gross salary divided by periods without adjustments. Then enter the dollar amounts from your W-4. Change one field at a time to see how the withholding line changes.

This is a paycheck withholding calculator. It models a modern Form W-4 using the 2026 payroll tables; it does not decide your ideal entries from a complete tax return. For a recommendation after a midyear job change, gather pay stubs and use the IRS Tax Withholding Estimator, which accounts for income and withholding already received.

What each W-4 adjustment changes

Keep annual amounts and per-paycheck amounts separate. Step 3 credits, Step 4(a) other income and Step 4(b) deductions are annual inputs. Step 4(c) is extra income tax withheld from every paycheck. Entering an annual extra-tax amount directly into Step 4(c) can produce a much larger reduction in each check than intended.

Worked examples on a $2,500 biweekly taxable paycheck

Assume a single employee paid 26 times a year. Federal taxable wages annualize to $65,000. Each row below changes only the indicated W-4 entry, with all other optional fields zero. These are calculated scenarios, not recommended W-4 settings. Social Security, Medicare, state taxes and employee benefit deductions are separate from this federal income tax result.

Why a W-4 deduction is different from a tax credit

A credit reduces the withholding amount dollar for dollar across the year, until calculated withholding reaches zero. A deduction reduces income used to calculate withholding, so its effect depends on the rate applied to that income. In the examples above, $2,200 of Step 3 credits and $5,000 of Step 4(b) deductions are not interchangeable.

Use the amount produced by the current Form W-4 deductions worksheet. Do not automatically enter the full standard deduction: the payroll calculation already builds in the standard withholding adjustment. The 2026 form includes worksheet inputs for applicable deductions such as qualified overtime and tips. The tool accepts the resulting worksheet total without deciding whether you qualify for each deduction.

Two jobs, a working spouse and self-employed side income

The Step 2(c) checkbox is intended for exactly two jobs and is most useful when their pay is similar; the form explains alternatives for other situations. Check the box on both jobs if using that option. Complete the credit and deduction adjustments consistently with the form’s instructions so the same annual benefit is not duplicated across employers.

For a side business, start by estimating profit and its extra federal income and self-employment taxes. W-4 extra withholding from an employee paycheck can help cover that liability. Entering gross business receipts as Step 4(a) other income would skip both business expenses and SE tax. Use the 1099 calculator for the business estimate, then the IRS estimator for a household withholding recommendation.

The calculation follows the IRS payroll worksheet

The tool annualizes taxable pay, applies Steps 4(a) and 4(b) and the Worksheet 1A adjustment, reads the appropriate standard or Step 2 checkbox schedule, spreads annual withholding across pay periods, subtracts annual credits per period with a zero floor, and adds Step 4(c). Published 2026 schedule thresholds and base amounts are retained, including rounded thresholds in the checkbox schedules.

Checking your pay stub without mixing federal tax and FICA

Compare the main result with the pay stub’s federal income tax withholding line. Do not compare it with total deductions, which can include Medicare, Social Security, state taxes, health premiums and retirement contributions. Keep the paycheck dates and pay frequency consistent when testing your entries.

The separate FICA illustration assumes its taxable wage base equals the federal taxable wages you entered. That assumption fails when traditional 401(k) deductions reduce income-tax wages but leave FICA wages unchanged. Year-to-date FICA wages affect the Social Security cap and Additional Medicare withholding; they do not change the primary federal income tax result here.

This calculator vs the IRS Tax Withholding Estimator

People searching for an IRS withholding calculator usually want one of two things: to see how the IRS tables calculate tax withholding on a paycheck, or to get a W-4 recommendation for the whole year. The IRS Tax Withholding Estimator at irs.gov does the second. This page does the first, using the same 2026 Publication 15-T tables employers use, so the result should match the federal income tax line on a pay stub when the inputs match.

When to use the official IRS estimator instead

Use the IRS estimator when you need a suggested W-4 based on the whole year: a new job started in October, two jobs at unequal wages, a spouse’s income, capital gains, bonuses, business income or withholding already paid. Gather recent pay stubs for all jobs and records of other income. The official tool can help translate that projection into a revised form.

This calculator excludes older allowance-based W-4 calculations, nonresident alien adjustments, pension withholding, state forms and a full-year refund recommendation. An exemption can be selected only if the prior-year and current-year no-liability conditions are met; federal withholding exemption does not exempt wages from FICA.