Payroll tax calculator
This calculator estimates the deductions and business costs attached to one worker’s pay period. Use it when a payroll-register entry or earnings statement shows a number you do not understand - for example, why $2,500.00 in biweekly earnings becomes a smaller deposit.
The result separates income-tax withholding, employee payroll taxes, state and regional deductions, and employer-paid amounts so employees can decide whether to correct an input, review Form W-4, or ask the payroll operator for the underlying calculation.
Enter the employee’s details
- Tax year: 2026
- Gross pay for this period: $____
- Pay frequency: annual, monthly, semimonthly, biweekly, weekly, or hourly
- Hours and hourly rate, if applicable: ____ × $____
- Federal Form W-4 filing status: single or married filing separately, married filing jointly, or head of household
- Form W-4 Step 2, 3, and 4 amounts: $____
- Pretax deductions: $____
- Post-tax deductions: $____
- Work state and local jurisdiction: ____
- State and local withholding inputs: ____
- Social Security wages already received this year: $____
- Medicare wages already received this year: $____
Estimated results
| Payroll result | Employee deduction | Employer cost |
|---|---|---|
| Federal income withholding | $____ | - |
| Social Security tax | $____ | $____ |
| Medicare tax | $____ | $____ |
| Additional Medicare tax | $____ | - |
| State income withholding and other regional deductions | $____ | Varies |
| Post-tax deductions | $____ | - |
| Net pay | $____ | - |
| Total business payroll cost shown | - | $____ |
Gross pay is earnings before deductions. Taxable wages are the portion of gross pay used to calculate a particular tax after applicable exclusions.
Withholding is money deducted from an employee’s pay as a prepayment toward an expected tax obligation. Net pay is the amount remaining after withholding, employee payroll taxes, and other deductions.
Federal Insurance Contributions Act (FICA) taxes are the Social Security and Medicare payroll taxes paid separately by employees and employers. An annual percentage is a rate or amount stated for the full year and converted to the selected pay period before it is applied.
Estimated employer contributions increase operating costs but do not reduce the worker’s check.
Hourly employees should enter regular wages, overtime, tips, commissions, or bonuses included in the same pay period. For an hourly pay period, multiply hours by the hourly rate and add other taxable earnings.
Salaried employees should convert annual income explicitly: divide by 12 for monthly pay, 24 for semimonthly pay, 26 for biweekly pay, or 52 for weekly pay.
To convert monthly pay to annual pay, multiply by 12; semimonthly pay by 24; biweekly pay by 26; weekly pay by 52; or hourly pay by the expected annual hours. The next step is understanding what each estimated result represents.
What do the payroll tax calculator results mean?
The results show an estimated path from gross earnings to net pay and distinguish employee deductions from employer-paid taxes and costs. Federal income-tax withholding is calculated for the selected pay period using wage information and Form W-4 instructions.
It is a prepayment toward income tax, not the worker’s final annual income-tax liability.
Federal Insurance Contributions Act (FICA) amounts consist of Social Security and Medicare taxes. For covered wages in 2026, Social Security generally applies at 6.2% for employees and 6.2% for employers until each worker reaches the annual wage base.
Medicare generally applies at 1.45% to both employees and employers without a wage-base limit. Additional Medicare withholding can apply after an employer pays an employee more than the federal payroll threshold during the calendar year, but employers do not match that additional amount.
State and regional results require particular care. California, Oregon, and New Mexico impose state income taxes, while Alaska, Nevada, Washington, and other jurisdictions may treat wages differently.
Arizona, Alabama, and Arkansas also have their own rules, forms, and schedules. A state may impose unemployment, disability, family-leave, local, or other payroll taxes even when it does not impose state income taxes.
Pretax deductions can reduce wages used for one tax without reducing wages used for another. Post-tax deductions reduce net pay only after applicable taxes have been calculated.
Contractors generally do not have payroll withholding applied in the same way because businesses paying independent contractors usually do not process those workers as employees.
Interpret the result in three ranges. A difference of a few cents often comes from payroll rounding.
A difference concentrated in one deduction line often comes from a Form W-4 entry, benefit election, or state and regional setting. A larger difference across several lines often comes from the wrong pay frequency, taxable-wage basis, or year-to-date amount.
Here is where the difference comes from: compare each input and formula with the method used for the same pay period on the payroll record.
How is the payroll tax estimate calculated?
The estimate applies each rule to the relevant taxable wages for the named pay period. Updated August 11, 2026, this methodology uses the 2026 IRS Publication 15 for federal employment taxes and IRS Publication 15-T for federal withholding methods.
For each payroll period, the calculation follows this sequence:
- Calculate gross pay for the selected pay period. Hourly gross pay equals regular hours multiplied by the regular hourly rate, plus overtime, tips, commissions, bonuses, and other taxable earnings in that pay period. Salary earnings equal annual compensation divided by 12 monthly, 24 semimonthly, 26 biweekly, or 52 weekly pay periods.
- Determine taxable wages for the selected pay period. Subtract only deductions excluded from the tax being calculated. One deduction can produce different federal income-tax, Social Security, Medicare, and state taxable-wage amounts.
- Estimate federal withholding for the selected pay period. Annualize applicable pay-period wages, apply the 2026 percentage method and Form W-4 adjustments, and then divide the annual result by 12 monthly, 24 semimonthly, 26 biweekly, or 52 weekly pay periods.
- Calculate FICA for the selected pay period. Social Security equals covered pay-period wages multiplied by 6.2%, limited by the 2026 $184,500 annual wage base. Medicare equals covered pay-period wages multiplied by 1.45%. These 2026 IRS rates and limits apply separately to employees and employers.
- Apply state and regional rules for the selected pay period. Calculate income tax and other required payroll deductions using the selected jurisdiction’s current instructions.
- Calculate net pay for the selected pay period. Net pay equals gross earnings minus pretax deductions, federal income-tax withholding, employee FICA, state and regional deductions, and post-tax deductions.
Federal unemployment tax under the Federal Unemployment Tax Act (FUTA) is generally an employer-paid business expense and is not withheld from employees. This page does not quote a single effective FUTA amount because credits, wage limits, deposit history, and unemployment treatment require current business records and official instructions.
The tool produces an estimate, not a verified filing calculation. It may not reproduce special payroll handling for clergy, household workers, nonresident aliens, railroad employees, agricultural labor, tipped employees, stock compensation, multiple work jurisdictions, local levies, or retroactive corrections.
Employers should verify state and regional rules with the relevant revenue and labor agencies before processing payroll taxes. The formula becomes easier to audit in a worked example.
Worked example: biweekly payroll tax calculation
This example reconciles one illustrative employee’s biweekly gross pay to estimated net pay using stated assumptions.
Assume the worker earns $65,000.00 annually, receives 26 biweekly checks, works in a jurisdiction omitted from this simplified calculation, has $100.00 of pretax deductions per biweekly check, has $40.00 of post-tax deductions per biweekly check, and remains below the Social Security wage base.
Example
- Biweekly gross pay: $65,000.00 annually ÷ 26 biweekly pay periods = $2,500.00
- Pretax deduction for the biweekly pay period: $100.00
- Assumed biweekly wages subject to federal income-tax withholding and FICA: $2,400.00
- Illustrative federal income-tax withholding for the biweekly pay period under the applicable 2026 Form W-4 method: $210.00
- Employee Social Security tax for the biweekly pay period: $2,400.00 × 6.2% = $148.80
- Employee Medicare tax for the biweekly pay period: $2,400.00 × 1.45% = $34.80
- Assumed regional tax for this simplified biweekly example: $0.00
- Post-tax deduction for the biweekly pay period: $40.00
- Estimated biweekly net pay: $2,500.00 − $100.00 − $210.00 − $148.80 − $34.80 − $40.00 = $1,966.40
The employer’s matching FICA cost for the biweekly pay period is $148.80 plus $34.80, or $183.60, before FUTA, unemployment charges, benefits, or other employer-paid costs. The federal income-tax withholding figure is illustrative because an auditable calculation also requires the employee’s complete Form W-4 entries.
For contrast, semimonthly payroll produces 24 checks: $65,000.00 annually ÷ 24 semimonthly pay periods = $2,708.33 before deductions and taxes, rounded to the nearest cent. That higher per-check amount does not mean a higher annual salary.
It changes the pay-period calculation, withholding-table inputs, and rounding. The next questions explain how employees can validate either estimate.
Payroll tax calculator FAQs
These answers explain how employees can check the estimate and choose the next payroll action.
Is this payroll tax calculator accurate?
The calculator provides an estimate for planning and reconciliation when its tax year, pay frequency, wages, Form W-4 data, deductions, and regional inputs match the payroll record. It does not replace a verified payroll calculation, tax return, or filing calculation.
Does the calculator show final annual income tax?
No. Income-tax withholding is a payroll prepayment, while final annual income-tax liability depends on total income, deductions, credits, filing status, and other tax-return information.
Employees can compare withholding through the official IRS Tax Withholding Estimator.
Are employer payroll taxes deducted from employees?
No. The employer share of FICA and employer unemployment charges generally increases business payroll costs without reducing employee net pay.
Employee FICA, federal income-tax withholding, regional withholding, and authorized employee deductions are separate lines.
Does the calculator cover every state?
A reliable estimate requires current state rules for the employee’s work and residence locations. Employers should check official forms for California, Arizona, Oregon, Washington, Nevada, New Mexico, Alaska, Alabama, Arkansas, or any other applicable jurisdiction.
What information is stored?
Employees should not enter Social Security numbers, bank details, or other unnecessary identifying information into a payroll tool. Review the site’s published privacy notice and use only the wage and tax inputs needed for the estimate.
What should I do if the result differs from a pay stub?
Here is where the difference comes from: compare gross earnings for the same pay period, pay frequency, taxable wages, year-to-date earnings, Form W-4 entries, state settings, and each deduction line.
Then ask the employer or payroll operator for the calculation behind the disputed amount and use the current government form to confirm it.
Use the payroll tax calculator as a reconciliation tool, then verify the settings against the employee’s earnings record and current official instructions.
The practical next step is to compare one complete pay period with the payroll register before changing withholding or filing employment taxes.