FICA Tax Explained: Social Security & Medicare in 2026

FICA stands for the Federal Insurance Contributions Act — a federal law enacted in 1935 that created the funding mechanism for two of America's largest social safety net programs: Social Security and Medicare.

Every working American who receives wages from an employer pays FICA taxes. The total FICA rate is 15.3% of gross wages, split equally between employee and employer. As an employee, 7.65% is withheld from your paycheck: 6.2% for Social Security and 1.45% for Medicare. Your employer matches this with an identical 7.65% from their own funds.

Unlike federal income tax — which varies based on earnings, filing status, and deductions — FICA taxes are flat rates applied from the first dollar of earned income. There are no deductions or credits that reduce your FICA obligation as a regular employee (though pre-tax deductions like 401(k) do not reduce Social Security and Medicare taxes either — those are calculated on gross wages, not taxable income).

FICA taxes are some of the most automatically misunderstood items on a pay stub because many employees assume tax withholding is purely income tax. Understanding FICA separately from income tax is essential to understanding your full paycheck.

The Social Security component of FICA is 6.2% of gross wages, paid by both employee and employer. However, there is a critical ceiling: Social Security tax only applies up to the Social Security Wage Base — a limit that is adjusted annually for inflation.

For 2025, the Social Security Wage Base was $176,100. Although 2026's figure is still being finalized at publication, historical increases average $4,000–$8,000 per year. We update this article as official numbers are released.

What this means practically: once your wages for the year exceed the wage base, Social Security tax stops being withheld for the remainder of the year. For high earners, this creates a perceptible jump in take-home pay typically in the fourth quarter.

Example: If the 2026 wage base is $180,000 and you earn $200,000 annually: • SS Tax paid = 6.2% × $180,000 = $11,160 (not 6.2% × $200,000) • The $20,000 above the cap is NOT subject to SS tax • Your employer also pays $11,160 in SS tax on your behalf

The Medicare component of FICA is 1.45% of all wages, with no wage base ceiling. Unlike Social Security tax, Medicare applies to every dollar of wages earned — from the first paycheck to the last, regardless of total annual income.

This seemingly small distinction creates a meaningful difference for high earners. A person earning $500,000 pays: • Social Security: 6.2% × $180,000 (estimated 2026 cap) = $11,160 • Medicare: 1.45% × $500,000 = $7,250

But wait — there's an additional layer for high-income earners.

The Affordable Care Act introduced the Additional Medicare Tax (AMT) starting in 2013. Single filers with wages above $200,000 pay an extra 0.9% Medicare tax on earnings above that threshold. For married filing jointly, the threshold is $250,000.

Combined Medicare rates for wages above the threshold: • Below $200,000 (single): 1.45% • Above $200,000 (single): 1.45% + 0.9% = 2.35%

Your employer is required to begin withholding the additional 0.9% once your wages in a single calendar year exceed $200,000 from that employer — regardless of your filing status or other income. Any under-withholding (for example, if you have two jobs each paying $150,000) is reconciled on your Form 1040 at tax time.

Important: The Additional Medicare Tax applies to wages above the threshold — not all Medicare wages. If you earn $250,000 as a single filer: • 1.45% × $200,000 = $2,900 (regular Medicare) • 2.35% × $50,000 = $1,175 (above threshold) • Total Medicare = $4,075

If you are self-employed — freelancer, sole proprietor, independent contractor, or partner in a partnership — there is no employer to pay the matching 7.65%. You must pay both halves yourself, totaling 15.3% of net self-employment income.

This is called Self-Employment Tax (SE Tax) and is calculated on Schedule SE of your Form 1040.

However, two deductions partially mitigate this burden: 1. You calculate SE Tax on 92.35% of net self-employment income (not 100%), which accounts for the employer's deduction of their half. 2. You can deduct half of SE Tax from your adjusted gross income (above-the-line deduction), reducing your federal income tax liability.

Example — Freelancer with $80,000 net self-employment income: • SE Tax base: $80,000 × 92.35% = $73,880 • SE Tax: $73,880 × 15.3% = $11,304 • AGI deduction: $11,304 ÷ 2 = $5,652 • Effective SE Tax after income tax benefit (22% bracket): $11,304 − ($5,652 × 22%) = $10,062

Quarterly estimated tax payments covering SE Tax + income tax are due April 15, June 15, September 15, and January 15 each year.

FICA taxes are calculated on gross wages — before any pre-tax deductions. This means your 401(k) contributions, health insurance premiums, and HSA contributions do NOT reduce the wages subject to FICA. They DO reduce wages subject to federal income tax.

This is a key distinction that many employees discover with surprise when reading their pay stubs.

Paycheck Example — $6,000 gross bi-weekly pay: • 401(k) contribution (pre-tax): $500 • Health insurance premium: $150 • Taxable wages for income tax: $6,000 − $500 − $150 = $5,350 • Wages for FICA: $6,000 (full gross — no reduction) • Social Security: $6,000 × 6.2% = $372.00 • Medicare: $6,000 × 1.45% = $87.00 • Total FICA withheld: $459.00

Your employer also pays $459.00 on your behalf, invisible to your pay stub but very real.

Most employees must pay FICA taxes, but there are narrow exemptions:

Student FICA exemption: Students working for their own university in positions directly related to their education may qualify for FICA exemption under IRC Section 3121(b)(10). This is determined by the institution.

Religious organizations: Members of certain approved religious sects that have conscientious objections to Social Security may apply for exemption using Form 4029, but must waive all Social Security benefits.

Non-resident alien employees: F-1, J-1, M-1, or Q-1 visa holders working in the US in "on-campus" capacities may be exempt temporarily. Rules vary significantly; consult an international tax advisor.

Government employees: Some state and local government employees participate in alternative pension systems instead of Social Security. These employees may not pay SS tax but also cannot claim SS benefits.

If you see no FICA withholding on your paystub and don't fall into one of these categories, it's worth verifying with your HR or payroll department.

Social Security tax overpayments happen when you work multiple jobs in a year and each employer withholds SS tax independently, unaware of income from your other employer.

If your combined wages from all employers exceed the Social Security Wage Base, you've likely overpaid. Your employers each correctly withheld based on their individual payments — but together, they withheld more than you owe.

The fix: Claim the excess Social Security tax withheld as a credit on line 11 of Schedule 3 (Additional Credits and Payments) on your Form 1040. The IRS will refund the overpayment.

You cannot request a refund directly from your employer for SS overpayment due to multiple jobs. The Form 1040 credit is the correct mechanism.

Social Security taxes fund the Old-Age, Survivors, and Disability Insurance (OASDI) program. It provides: • Retirement benefits (available from age 62; full benefits at 67 for those born after 1960) • Disability benefits if you become unable to work • Survivor benefits to your spouse and dependent children

The more you earn and pay into the system over your working years, the higher your eventual Social Security benefit — up to a maximum. The 2025 maximum monthly benefit for someone retiring at full retirement age is $3,822.

Medicare taxes fund two components: • Medicare Part A: Hospital insurance (generally premium-free if you paid in for 40 quarters) • Medicare Part B: Medical insurance (monthly premium required; income-based surcharges for high earners)

Neither program is in imminent danger of insolvency, but the Social Security trustee reports indicate the combined trust fund could be depleted by 2033-2035 under current projections — at which point benefits would be payable at roughly 77-80% of current levels without legislative changes.