FICA Tax Explained: Social Security & Medicare Withholding

Reading your paycheck: where FICA fits

Scan a typical pay stub and you will see federal income tax, possibly state tax, and lines labeled Social Security and Medicare. Together, those payroll deductions reflect the Federal Insurance Contributions Act—FICA—a mandatory tax that funds two of the largest federal benefit programs.

FICA can look opaque at first glance, but the mechanics are predictable once you know the split between Old-Age, Survivors, and Disability Insurance (OASDI) and Hospital Insurance (HI). Whether you are a W-2 employee, an employer running payroll, or self-employed, understanding 2026 rates helps you verify withholdings and plan cash flow.

What is FICA tax?

Congress enacted the Federal Insurance Contributions Act in 1935 alongside the Social Security program to collect dedicated payroll taxes for retirement and disability benefits. Medicare funding was added in 1965. Revenue collected under FICA flows directly into the Social Security and Medicare trust funds—not the general federal budget.

Social Security (OASDI) pays monthly benefits to retirees, disabled workers, and eligible family survivors. Medicare (HI) helps cover hospital and certain medical costs, primarily for people age 65 and older and for some younger individuals with qualifying disabilities.

For 2026, the Social Security wage base rose to $184,500 (up from $176,100 in 2025). Percentage rates themselves are unchanged from 2025, but higher earners will see Social Security withholding continue further into the calendar year because of the larger cap.

2026 FICA rate breakdown at a glance

Use the table below to cross-check your paycheck or payroll system. Employee and employer each pay 7.65% on covered wages before any additional Medicare surtax.

• Employee FICA in 2026: 6.2% OASDI + 1.45% Medicare = 7.65%
• Employer FICA in 2026: 6.2% OASDI + 1.45% Medicare = 7.65%
• Self-employed (SECA) in 2026: 12.4% OASDI + 2.9% Medicare = 15.3%, plus any 0.9% additional Medicare tax above thresholds

Social Security tax and the $184,500 wage cap

Employees pay 6.2% of covered wages up to the annual wage base, and employers match that 6.2%. Once year-to-date wages exceed $184,500, Social Security withholding stops for the remainder of the calendar year—even if you keep earning.

Maximum employee Social Security tax for 2026 is $11,439 (6.2% × $184,500). Employers contribute the same per employee who hits the cap. Because the base climbed from $176,100 in 2025, workers near the top of the income scale may notice Social Security deductions lasting a few extra pay periods compared with last year.

Medicare tax: no wage cap, but a 0.9% surtax

Medicare tax is 1.45% for employees and 1.45% for employers on all covered wages—there is no upper limit. High-income workers may also owe an additional 0.9% Medicare tax on earnings above filing-status thresholds.

Employers must withhold the base 1.45% on all covered pay. They also begin withholding the 0.9% Additional Medicare Tax once an employee’s wages from that employer exceed $200,000 in the calendar year—regardless of the worker’s actual filing status.

Self-employed workers pay 15.3% under SECA

If you work for yourself, you pay Self-Employment Contributions Act (SECA) taxes instead of split employee-employer FICA. SECA mirrors both sides: 12.4% Social Security up to the $184,500 wage base and 2.9% Medicare on all net earnings—15.3% combined before any 0.9% surtax. See our guide on how self-employment tax is calculated for deeper coverage.

Self-employment tax is computed on 92.35% of net earnings from self-employment. Half of the SE tax is deductible for income-tax purposes, which lowers adjusted gross income without changing the underlying SECA rate.

When combined wages and self-employment income push you over your filing-status threshold for additional Medicare, you owe the 0.9% surtax on the excess—calculated and paid with your individual return, often through estimated tax payments.

How to calculate FICA in 2026: three scenarios

Common FICA exemptions

FICA applies to most wage earners, but limited statutory exceptions exist. Confirm your specific facts before changing withholding or deposit schedules.

Federal income tax vs. FICA: what is different in 2026

FICA and federal income tax operate as separate systems. FICA funds Social Security and Medicare using fixed rates and program-specific rules—the wage base, Medicare surtax thresholds, and SECA mechanics. Federal income tax is pay-as-you-go and varies with filing status, brackets, credits, and deductions.

FICA applies to earned wages and self-employment income. Income tax applies to a broader income basket—wages, interest, dividends, capital gains—and gets reconciled annually on Form 1040. You can tune income-tax withholding through Form W-4, but FICA withholding is not adjustable except where a legal exemption applies.

Overpaid Social Security from multiple jobs? Here is how to fix it

Hold more than one W-2 job in the same year and each employer must withhold Social Security up to the $184,500 wage base independently. Combined withholding can exceed the $11,439 maximum.

Claim the excess as a credit on Form 1040. Compare total Social Security tax withheld (W-2 box 4) to the legal maximum—the difference is refundable. If a single employer over-withheld in error, request a payroll correction or refund from that employer first.

For additional Medicare tax, employers start withholding once wages from that employer pass $200,000. Over- or under-withholding gets trued up on your return based on your filing-status threshold. Adjust withholding strategy or make estimated payments if you expect a year-end surtax bill.

Tips and overtime are still subject to FICA

Employees must report tip income so employers can withhold FICA properly, and overtime pay is treated as regular wages for payroll tax. Recent federal legislation created new income-tax deductions for qualified tips and overtime under the One Big Beautiful Bill Act—but those are income-tax provisions, not FICA exemptions. Social Security and Medicare tax still applies to every dollar of tips and overtime.

Employers in certain industries may claim an income-tax credit (often called the 45B tip credit) related to the employer share of FICA on tipped wages. That credit does not reduce FICA that must be withheld from employees or remitted by employers.

If withholding surprises you

Unexpected FICA amounts or a year-end additional Medicare bill can catch anyone off guard. A qualified advisor can review W-4 settings, payroll configuration, or self-employed estimated payments so you stay compliant with IRS and SSA rules while avoiding cash-flow shocks.

When FICA is correct but an underlying tax balance has grown—perhaps from missed estimated payments or prior-year under-withholding—Valor Tax Relief can help evaluate back tax relief, installment agreements, and other resolution paths.