FICA Tax Calculator

The FICA Tax Calculator estimates the U.S. payroll taxes associated with Social Security and Medicare. Enter wages or self-employment income, choose one of the tax years in the form, select a filing status for the Additional Medicare Tax threshold, and choose whether to use the employee rate or a simplified self-employed rate. The result separates Social Security tax, Medicare tax, Additional Medicare Tax, the Social Security wage base, and an employer match line.

FICA is not federal income tax. It is a payroll tax system that funds Social Security and Medicare. Employees generally have FICA withheld from wages, while employers pay a matching Social Security and Medicare amount. Self-employed people generally account for both sides through self-employment tax, but the actual self-employment tax calculation has extra rules. This page uses a simplified calculation and explains where that differs from a full return.

Inputs and scope

Wages or self-employment income is the amount the calculator applies payroll rates to. Tax year selects the built-in Social Security wage base. The form currently supports 2021, 2022, 2023, and 2026 and defaults to 2026; it does not automatically update to newer wage bases. Filing status selects the Additional Medicare Tax threshold. Self-employed changes the Social Security rate from 6.2% to 12.4% and the Medicare rate from 1.45% to 2.9%.

Because the supported years are limited, this page is best for understanding the math used by the tool or reviewing older-year estimates. Current payroll decisions should use the latest IRS and Social Security Administration publications. Rates, wage bases, thresholds, and rules can change.

Formula used by the calculator

The Social Security portion is capped by the selected year’s wage base:

$\text{Social Security tax} = \min(\text{income}, \text{wage base}) \times \frac{\text{Social Security rate}}{100}$

The regular Medicare portion applies to all income entered:

$\text{Medicare tax} = \text{income} \times \frac{\text{Medicare rate}}{100}$

Additional Medicare Tax is calculated above the filing-status threshold:

$\text{Additional Medicare tax} = \max(0, \text{income} - \text{threshold}) \times 0.009$

The calculator adds the three parts:

$\text{total FICA} = \text{Social Security tax} + \text{Medicare tax} + \text{Additional Medicare tax}$

For employees, the employer match line equals Social Security tax plus regular Medicare tax. For self-employed entries, the calculator displays zero on that line because the doubled rate is already included in the primary estimate.

Example: estimating FICA tax

Use $75,000 of income, 2023, Single, and leave Self-employed off. The calculator’s 2023 wage base is $160,200, so the entire $75,000 is within the Social Security cap. The employee Social Security rate is 6.2%:

$\text{Social Security tax} = \min(75000, 160200) \times \frac{6.2}{100} = 4650$

Regular Medicare uses 1.45% on all income:

$\text{Medicare tax} = 75000 \times \frac{1.45}{100} = 1087.50$

For a single filer, the calculator’s Additional Medicare threshold is $200,000, so no additional tax applies:

$\text{Additional Medicare tax} = \max(0, 75000 - 200000) \times 0.009 = 0$

The total is $5,737.50. The result panel also shows $4,650.00 for Social Security tax, $1,087.50 for Medicare tax, $0.00 for Additional Medicare Tax, $160,200.00 for the wage base, and $5,737.50 for employer FICA match.

How FICA fits into the tax system

FICA sits beside income tax withholding on a paycheck. A worker may see federal income tax, Social Security, Medicare, state tax, benefits, retirement contributions, and other deductions all on the same pay stub, but they are not the same tax. Social Security has an annual wage base, Medicare generally does not, and Additional Medicare Tax depends on thresholds tied to filing status.

For household planning, pair this estimate with the salary calculator to understand gross pay, the budget calculator to plan cash flow, and the debt-to-income calculator to compare income with monthly obligations. For income tax bracket planning, use the tax bracket calculator. None of those tools turn this simplified FICA estimate into a filed payroll return.

Important limitations

The self-employed switch is intentionally simple. It doubles the regular Social Security and Medicare rates on the entered income, but it does not multiply net earnings by the statutory self-employment factor, compute the above-the-line deduction for part of self-employment tax, or handle special categories of earnings. Treat that output as a rough comparison, not a Schedule SE substitute.

This calculator is informational, not tax advice. Verify current wage bases, rates, Additional Medicare thresholds, and employer rules before running payroll, making estimated tax payments, or filing. Consult official IRS instructions, SSA materials, payroll software, or a qualified tax professional for personal or business decisions.

Sources

• IRS, Publication 15 — employer payroll tax guidance, withholding, Social Security, and Medicare context.
• IRS, Topic no. 751, Social Security and Medicare withholding rates — official withholding rate guidance.
• IRS, Self-employment tax — official overview of Social Security and Medicare taxes for self-employed taxpayers.
• Social Security Administration, POMS RM 01310.025 — official SSA operations guidance referencing Social Security and Medicare wages.