FICA Tax Calculator

Background.

FICA tax is the federal payroll tax that funds Social Security and Medicare, the two largest social insurance programs in the United States. FICA stands for the Federal Insurance Contributions Act, which Congress enacted in 1935 as part of the New Deal. The original statute established a 1% tax on both employer and employee to fund old-age insurance. Congress expanded the program in 1965 under the Medicare Act, adding the Hospital Insurance tax. Today, the total FICA tax rate is 15.3% of wages, split evenly between employer and employee: each pays 6.2% for Social Security and 1.45% for Medicare. Self-employed individuals pay both portions under the Self-Employed Contributions Act (SECA), though they can deduct the employer-equivalent half from adjusted gross income. An additional 0.9% Medicare tax applies to high earners above $200,000 for single filers or $250,000 for married couples, introduced by the Affordable Care Act in 2013.

Social Security tax is capped at the annual wage base, which is $168,600 for 2024. Wages above this amount are not subject to Social Security tax, though Medicare tax continues on all wages with no cap. The wage base is indexed to the national average wage index and typically increases each year; it rose from $160,200 in 2023 to $168,600 in 2024, a 5.2% increase. Employers must withhold FICA tax from each paycheck and match the employee's contribution, remitting both portions to the IRS quarterly on Form 941. The combined employer-employee total flows into the Social Security Trust Fund and the Medicare Hospital Insurance Trust Fund, which paid out roughly $1.4 trillion in benefits in 2023. The payroll tax is the primary revenue source for both programs, generating over $1.2 trillion annually.

FICA tax is often overlooked by employees because it is automatically withheld, but it represents a significant portion of total tax burden—frequently exceeding federal income tax for middle-income households. A worker earning $75,000 pays $5,737.50 in employee FICA tax annually, while the employer pays an equal amount. The total economic cost is $11,475, or 15.3% of wages. For high earners, the additional Medicare tax adds another layer. Payroll managers, small business owners, self-employed contractors, and employees verifying paychecks all use FICA calculations regularly. Understanding the tax is essential for budgeting, payroll verification, total compensation analysis, and estimating the employer cost of labor. This calculator breaks down employee and employer portions, shows the impact of the wage base cap, and computes the additional Medicare tax with precision. For planning purposes, note that the wage base and rates are updated annually by the IRS and SSA, and self-employed individuals must pay both halves through quarterly estimated taxes. The tax is regressive for wages below the cap and proportional above it, creating a complex distributional profile that policymakers have debated since the program's inception. Employers who fail to withhold or remit FICA face penalties under IRC §6656, and employees have no legal way to opt out of the system. The tax has been increased multiple times since 1935, rising from 1% to the current 6.2% for Social Security.

What is fica tax calculator?

FICA tax is the federal payroll tax funding Social Security and Medicare under the Internal Revenue Code. Employees and employers each pay 6.2% for Social Security on wages up to the annual wage base and 1.45% for Medicare with no wage limit. Self-employed individuals pay both portions, for a combined 12.4% Social Security and 2.9% Medicare. An additional 0.9% Medicare tax applies to wages above $200,000 for single filers or $250,000 for married couples. FICA tax is withheld from each paycheck and remitted by the employer via Form 941 on a quarterly basis. Key vocabulary includes the wage base (the maximum taxable earnings for Social Security, $168,600 in 2024), earned income (wages and salaries subject to FICA), and trust funds (the accounts holding collected taxes). Distinctions matter: FICA is separate from federal income tax, which uses progressive brackets, and from self-employment tax, which applies to net business income rather than wages. The tax is measured in dollars, with rates expressed as dimensionless percentages applied to gross wages. Non-cash benefits such as employer-paid health insurance are generally exempt from FICA. Tip income is also subject to FICA taxation, and employers must report it promptly to the IRS quarterly on Form 8027.

How to use this calculator.

1. 01Enter your gross wages for the period or year.
2. 02Select your pay frequency.
3. 03Choose your filing status for Medicare threshold.
4. 04Review the employee Social Security and Medicare tax.
5. 05See the employer matching portions.
6. 06Check if additional Medicare tax applies.
7. 07Compare total FICA tax to your gross wages.

The formula.

FICA tax consists of two components with different structures and economic rationales. Social Security tax is a flat 12.4% split equally between employer and employee, but it applies only to wages up to the annual wage base. The mathematical expression uses a minimum function: SS Taxable = min(grossWages, wageBase). For 2024, the base is $168,600. A worker earning $200,000 pays Social Security tax on only $168,600, with the remaining $31,400 exempt. The employer matches the same capped amount. This cap exists because Social Security benefits are also capped; the program replaces a percentage of pre-retirement earnings up to a maximum, so contributions beyond the wage base do not generate additional benefits. The derivation is straightforward: if the benefit formula has a ceiling, the tax formula has a corresponding ceiling to maintain the link between contributions and benefits.

Medicare tax is a flat 2.9% split equally, with no wage cap. It applies to all wages, reflecting the fact that Medicare benefits are not directly tied to lifetime contributions in the same way as Social Security. The additional Medicare tax of 0.9% is paid only by the employee, not the employer, on wages above the threshold. This surtax was introduced by the Affordable Care Act to help fund Medicare expansion and reduce general-revenue subsidies to the program.

The total economic burden of FICA tax is the sum of both portions: 15.3% on wages up to the Social Security cap, then 2.9% on wages above the cap, plus 0.9% on high earners. While the employer portion is not shown on pay stubs, economists generally agree that the employer share is borne by workers in the form of lower wages. Dimensional analysis is straightforward: wages in dollars multiplied by dimensionless rates produces tax in dollars. An alternative form computes per-paycheck withholding by dividing annual tax by the number of pay periods: 26 for biweekly, 12 for monthly, 52 for weekly.

A worked example.

Frequently asked questions.

References& sources.

1. [1]IRS (2024). Topic No. 751: Social Security and Medicare Withholding Rates.
2. [2]IRS (2023). Notice 2023-75: Social Security Wage Base for 2024.
3. [3]IRS (2024). Questions and Answers for the Additional Medicare Tax.
4. [4]Social Security Administration (2024). Contribution and Benefit Base.
5. [5]CMS (2024). Medicare Trust Funds.