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 programs: Social Security and Medicare. Every working American who receives wages from an employer pays FICA taxes, and most people I talk to don't realize it's actually two separate taxes on two separate line items of their pay stub.

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 — money you never see but that is paid on your behalf.

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. Traditional 401(k) contributions do not reduce FICA — Social Security and Medicare are calculated on gross wages, not taxable income. This surprises a lot of workers who assume all their pre-tax deductions work the same way. They don't.

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

For 2025, the Social Security Wage Base was $176,100. The 2026 figure typically increases by $4,000–$8,000 per year. Once your wages for the year exceed this wage base, Social Security tax stops being withheld for the remainder of the year. For higher earners, this creates a noticeable jump in take-home pay that typically appears in Q4 — a real "bonus" that's easy to plan around once you know it's coming.

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 regardless of total annual income. There's no point in the year where Medicare withholding stops.

This distinction matters 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 there's an additional layer for high-income earners that most workers don't know about until they get their first paycheck above $200,000.

The Affordable Care Act introduced the Additional Medicare Tax 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% automatically once your wages from that employer exceed $200,000 in a calendar year — regardless of your filing status or income from other sources. Any under-withholding (for example, if you have two jobs each paying $150,000, each employer doesn't see the full picture) is reconciled on your Form 1040 at tax time.

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're self-employed — freelancer, sole proprietor, independent contractor, or partner — there's 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.

Here's the part that catches a lot of first-year freelancers off guard: it's not 15.3% on your gross revenue. Two deductions partially offset 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 own FICA half. 2. You can deduct half of SE Tax from your adjusted gross income as an above-the-line deduction, reducing your federal income tax.

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 • Federal income tax savings (22% bracket): $5,652 × 22% = $1,243 • Effective SE Tax after income tax benefit: $10,061

Quarterly estimated tax payments — April 15, June 15, September 15, and January 15 — must cover both SE Tax and income tax to avoid underpayment penalties.

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 one of the most misunderstood distinctions on a pay stub.

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 for 401k) • Social Security: $6,000 × 6.2% = $372.00 • Medicare: $6,000 × 1.45% = $87.00 • Total FICA withheld from your check: $459.00

Your employer also pays $459.00 on your behalf — invisible to your pay stub but very real in terms of total cost of your employment.

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

**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, not the student.

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

**Non-resident alien employees:** F-1, J-1, M-1, or Q-1 visa holders working in on-campus capacities may be temporarily exempt. The 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 pay stub and don't fall into one of these categories, verify with your HR or payroll department — it may be a payroll setup error worth catching early.

Social Security tax overpayments happen when you work multiple jobs in a year and each employer withholds SS tax independently — unaware of what other employers have withheld. Once your combined wages across all employers exceed the Social Security Wage Base, you've overpaid.

The fix is straightforward: 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 difference.

You cannot request a refund from your employers directly for overpayment caused by multiple jobs — the Form 1040 credit is the correct mechanism. This is one of the most overlooked tax refund opportunities for workers who change jobs mid-year or hold two positions simultaneously.

Social Security taxes fund the Old-Age, Survivors, and Disability Insurance (OASDI) program, which provides: • Retirement benefits (available from age 62; full benefits at 67 for those born after 1960) • Disability benefits if you become unable to work before retirement • 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 was $3,822.

Medicare taxes fund: • 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 IRMAA surcharges apply for high earners)

Neither program faces imminent collapse, but 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.