FICA funds two separate programs, not one

FICA is the payroll tax that appears on your pay stub as two line items: one for Social Security and one for Medicare. They are not the same program, they do not share a fund, and they work in completely different ways. Understanding what each one covers helps you see why the tax exists and what you are actually paying for.

When you see "FICA tax" on a paystub, you are looking at a combined rate of 15.3 percent of your wages (your employer pays half, you pay half). But that single number masks two separate taxes with separate purposes, separate trust funds, and separate benefit rules.

Key Takeaways

  • Social Security (12.4 percent of wages) funds retirement, disability, and survivor benefits for workers and their families.
  • Medicare (2.9 percent of wages) funds hospital insurance, medical insurance, and prescription drug coverage for people age 65 and older, plus some younger people with disabilities.
  • Each program has its own trust fund and its own rules for who receives benefits and how much they receive.
  • Self-employed people pay both the employee and employer share of FICA, which is why their rate appears higher on tax forms.

Social Security: retirement, disability, and family benefits

The Social Security portion of FICA is 12.4 percent of your wages (6.2 percent from you, 6.2 percent from your employer). This money goes into the Social Security Trust Fund, which pays out three types of benefits: retirement benefits to workers age 62 and older, disability benefits to workers who cannot work due to a medical condition, and survivor benefits to the family members of a worker who has died.

To receive any Social Security benefit, you must have earned enough work credits. Generally, you earn one credit for every $1,640 of wages in a year (this amount changes annually). Most people need 40 credits total to may have access to for retirement or survivor benefits, and 20 credits earned in the last 10 years to may have access to for disability benefits. The amount you receive depends on your age when you claim and how much you earned during your working years.

Social Security is a pay-as-you-go system: the payroll taxes collected today pay benefits to current retirees and beneficiaries. Your future benefits will come from payroll taxes collected from future workers. This is why changes to the program — such as raising the retirement age or adjusting the tax rate — affect different generations differently.

Medicare: hospital and medical coverage for seniors and some disabled people

The Medicare portion of FICA is 2.9 percent of your wages (1.45 percent from you, 1.45 percent from your employer). This money goes into the Medicare Trust Fund, which covers hospital insurance (Part A), medical insurance (Part B), and prescription drug coverage (Part D) for people age 65 and older. It also covers some younger people with disabilities and people with end-stage renal disease.

Medicare Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health services. Part B covers doctor visits, outpatient services, and preventive care. Part D covers prescription medications. Unlike Social Security, Medicare is not based on how much you earned; it is based on age and disability status. Everyone who reaches 65 and has paid Medicare taxes for at least 10 years (40 quarters) is may have access to to Part A, regardless of income.

There is also an additional Medicare tax of 0.9 percent on wages above $200,000 for single filers and $250,000 for married couples filing jointly. This extra tax was added in 2013 and goes into the Medicare Trust Fund. Self-employed people pay this additional tax on net earnings above those same thresholds.

Why FICA is separate from income tax

FICA and federal income tax are two different taxes with two different purposes. Income tax funds general government operations — defense, infrastructure, federal agencies, and so on. FICA taxes fund only Social Security and Medicare. This is why you see them listed separately on your pay stub and why they are reported separately on your tax return.

FICA also has a wage cap for Social Security (but not for Medicare). In 2024, you pay Social Security tax only on the first $168,600 of wages. Once you earn more than that in a year, your employer stops withholding the Social Security portion. This means high earners pay a smaller percentage of their total income into Social Security than lower earners do. Medicare has no wage cap, so you pay the 1.45 percent Medicare tax on all wages, no matter how much you earn.

How self-employed people pay FICA

If you are self-employed, you pay both the employee and employer share of FICA on your net business income. This is called self-employment tax, and it totals 15.3 percent (12.4 percent for Social Security, 2.9 percent for Medicare). You calculate it on Schedule SE and report it on your Form 1040.

Self-employed people can deduct half of their self-employment tax as an adjustment to income on their tax return. This partially offsets the fact that they pay both sides of the tax. However, the full 15.3 percent still goes into the Social Security and Medicare trust funds, just as it does for wage earners.

What happens to FICA money after it is collected

The Internal Revenue Service collects FICA taxes from employers and employees, then transfers the money to the Social Security Administration and the Centers for Medicare & Medicaid Services. Each agency manages its own trust fund and pays out benefits according to the rules of its program.

The Social Security Trust Fund and the Medicare Trust Funds are separate accounts. Money collected for Social Security cannot be used to pay Medicare benefits, and vice versa. If one program runs short of money, it does not automatically draw from the other. This separation is why policy discussions about "saving Social Security" and "fixing Medicare" are separate conversations — they are different programs facing different financial pressures.

Why you see FICA on every paycheck

FICA withholding is mandatory for all wage earners. Your employer is required by law to withhold it from your pay and send it to the government. You cannot opt out, even if you do not plan to use Social Security or Medicare. This is because both programs are insurance programs: you pay in while you work, and you (or your family) receive benefits if you retire, become disabled, or die.

The amount withheld is automatic and does not change based on your income level, filing status, or personal circumstances. It is calculated as a fixed percentage of your gross wages. If you have multiple jobs, you pay FICA on all of them, though you may be able to claim a credit on your tax return if you overpay Social Security tax in a single year.

Frequently Asked Questions

Can I get back the FICA taxes I paid if I do not use Social Security or Medicare?

No. FICA is a mandatory tax, not a savings account. You cannot withdraw your contributions or pass them to your heirs if you do not use the benefits. However, if you die before claiming Social Security, your family members may be may have access to to survivor benefits. If you are married, your spouse may receive benefits based on your earnings record even if you do not claim.

What if I worked in another country — do those years count toward Social Security?

Generally, only work in the United States counts toward Social Security credits. However, the U.S. has totalization agreements with about 30 countries that allow work in those countries to count toward benefits under certain conditions. You would need to contact the Social Security Administration to find out whether your country has an agreement and how your foreign work might affect your benefits.

Do I pay FICA on all types of income?

No. FICA applies only to wages and self-employment income. It does not explore to investment income, capital gains, rental income, or interest. This is why high-income earners who earn most of their money from investments pay a much lower percentage of their total income in FICA than wage earners do.

If I am already on Medicare, do I still pay the Medicare portion of FICA?

Yes. If you are still working, you continue to pay Medicare tax on your wages even after you turn 65 and enroll in Medicare. The tax you pay continues to fund the Medicare Trust Fund for current and future beneficiaries.

Why is there an additional Medicare tax for high earners?

The additional 0.9 percent Medicare tax was added by the Affordable Care Act in 2013 to help fund Medicare. It applies only to wages above $200,000 for single filers and $250,000 for married couples filing jointly. Unlike the regular Medicare tax, this additional tax is not matched by employers — you pay the full amount yourself.