Estimated Payroll Taxes Calculator

Every paycheck triggers two separate tax events happening at the same moment. The employee loses a slice of gross wages before the money ever lands in their account. The employer simultaneously writes a second check to the IRS — one the employee never sees — that roughly mirrors the first. Together these form the FICA system: Federal Insurance Contributions Act taxes that fund Social Security and Medicare.

Social Security tax applies at the same rate to both sides, but only up to a wage ceiling that resets each January. Once an employee's cumulative earnings cross that line, Social Security tax stops for the rest of the year — for both the employee and the employer. Medicare has no such ceiling. Every dollar earned, regardless of how high the salary climbs, is subject to Medicare tax. High earners also face an Additional Medicare Tax on their personal return, but that is outside the scope of employer withholding calculations.

FUTA sits in a separate lane. It is a federal unemployment insurance contribution that only the employer pays, and it applies only to the first slice of each employee's annual wages. For most payrolls it is a modest per-employee cost early in the year that vanishes once the wage base is cleared. State unemployment taxes (SUTA) work similarly but vary by state, employer experience rating, and year — this tool does not model them, which means the true employer cost of labor is likely higher than what you see here.

Use this tool when you are processing a new hire offer and want to know the true all-in cost before signing an offer letter. It is also useful for a small business owner running payroll manually or spot-checking software output before remitting taxes. Finance teams often run these numbers when building headcount models to make sure labor cost projections include both sides of FICA and FUTA.

This tool is also appropriate for employees who want to verify their own withholding. If your pay stub shows a Social Security deduction and Medicare deduction, you can confirm the amounts match what this calculator produces for your gross wages. Discrepancies are worth raising with your payroll administrator.

Do not rely on this tool alone for state or local payroll obligations. Several states impose additional payroll taxes — state unemployment insurance, paid family leave premiums, disability insurance — that vary widely and are not modeled here. If you are onboarding employees in a new state, consult that state's employer account documentation before finalizing payroll cost estimates.

Mistake 1 — Treating gross wages as the full cost of labor. Business owners quoting a salary figure often forget the employer FICA match and FUTA layered on top. If you budget $4,800 per paycheck but ignore the $367.20 employer tax cost, your labor budget is understated. The true cost of this paycheck is gross wages plus the employer share.

Mistake 2 — Forgetting the Social Security wage base mid-year. Payroll software handles this automatically, but manual calculators and quick estimates often apply Social Security tax to every dollar without checking cumulative earnings. Once year-to-date wages pass the wage base ceiling, both the employee and employer stop owing Social Security tax on further wages that year. Applying the full rate past that point overstates tax liability and, if acted on, causes overwithholding that requires correction.

Mistake 3 — Assuming self-employed individuals use the same rates. A W-2 employee pays the employee side of FICA and their employer pays the matching employer side. A self-employed person operates as both, so they owe the combined rate on net self-employment income — roughly double the employee-only rates shown here, before an above-the-line deduction for half of it. This tool is built for the W-2 scenario; the self-employed need a separate self-employment tax calculation.

The calculation follows a straightforward split-and-cap structure. Start with gross wages for the pay period. For Social Security, check whether wages have already reached the annual wage base; only the eligible portion is taxed. Multiply the eligible amount by 0.062 for the employee side and the same 0.062 for the employer side. For Medicare, multiply the full gross wages by 0.0145 twice — once for each side. Add all four amounts to get total FICA tax.

For FUTA, check how much of the annual wage base the employee has already consumed. Only wages within the remaining room count. Multiply eligible FUTA wages by 0.006. This is an employer-only charge so it appears only in the employer column.

Employee total equals Social Security employee plus Medicare employee. Employer total equals Social Security employer plus Medicare employer plus FUTA. Grand total combines both sides. For the example inputs — $4,800 gross wages — employee total is $367.20, employer total is $367.20, and the combined payroll tax cost is $734.40.

This calculator assumes the standard employer FUTA rate after the maximum state unemployment tax credit. Employers who have not paid their state unemployment taxes in full lose some or all of that credit, raising the effective FUTA rate. Additionally, the calculator does not model the Additional Medicare Tax that applies to high earners on their individual returns — that is a year-end filing obligation, not a payroll withholding item for most employers. At the margin, wages near the Social Security wage base require mid-period proration: if a single paycheck straddles the ceiling, only the portion below the remaining room is subject to the tax, which requires knowing cumulative wages to the dollar rather than an annual estimate.