Every paycheck shows two deductions labeled Social Security and Medicare, and the reason you pay FICA and Medicare taxes is that federal law funds those two programs through a dedicated payroll tax on nearly all wages. The 7.65 percent that comes out of your pay in 2026 is not a general tax; it buys you future eligibility for retirement income, disability coverage, survivor benefits for your family, and premium-free hospital insurance at age 65. Your employer pays a matching 7.65 percent on top of what you contribute.
What Your Deduction Actually Buys
The 6.2 percent Social Security piece funds monthly payments to three groups: retirees who have stopped working, workers who develop a serious disability, and surviving family members of workers who die. The average retired worker collects about $2,071 per month in 2026, and someone who earned high wages throughout a career and waited until full retirement age can receive up to $4,152 per month.1Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet
The 1.45 percent Medicare piece funds Part A, which covers hospital stays, skilled nursing care, and hospice. If you have worked and paid Medicare taxes long enough, Part A comes with no monthly premium once you turn 65. People who have not paid in long enough face a monthly premium that can run several hundred dollars. Every Medicare line on your paycheck is prepaying that future hospital coverage for yourself.
How the Deduction Earns You Eligibility
Paying FICA is how you qualify for the benefits it funds. The Social Security Administration tracks your contributions through work credits. In 2026, you earn one credit for every $1,890 in wages, up to four credits per year, and you need 40 credits, roughly ten years of work, to qualify for retirement benefits.2Social Security Administration. How You Earn Credits
Disability benefits work on a different formula. You generally need 40 credits with at least 20 earned in the ten years before your disability began, though younger workers can qualify with fewer.3Social Security Administration. How Does Someone Become Eligible for Disability Benefits That matters because people who step away from paid work for long stretches can lose disability coverage even after previously earning enough credits.
Medicare Part A eligibility follows a similar pattern. You typically need 40 quarters of paying Medicare taxes to get premium-free coverage at 65, and those quarters do not have to be consecutive. Time out of the workforce does not erase what you have already banked.
The 2026 Math on Your Paycheck
If you are a W-2 employee, three numbers determine what comes out:
- Social Security (OASDI): 6.2 percent of your wages, up to $184,500 in 2026. Your employer pays another 6.2 percent.4Social Security Administration. Contribution and Benefit Base
- Medicare: 1.45 percent of all wages, with no cap. Your employer matches it.5Internal Revenue Service. Topic No 751, Social Security and Medicare Withholding Rates
- Additional Medicare Tax: 0.9 percent on wages above $200,000 for single filers or $250,000 for joint filers. Only you pay it; the employer does not match.6Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
The $184,500 wage base means Social Security tax stops coming out for the rest of the calendar year once your year-to-date earnings hit that figure.4Social Security Administration. Contribution and Benefit Base Medicare has no such ceiling. Every dollar you earn stays subject to the 1.45 percent. The wage base adjusts each year with national wage trends, so it usually creeps up. The Additional Medicare Tax thresholds, by contrast, are written into the statute and have not changed since 2013. Employers begin withholding the extra 0.9 percent once your wages pass $200,000 in a calendar year regardless of your filing status; if your household situation puts you above or below the actual joint-filer threshold, the difference gets reconciled on your tax return.7Office of the Law Revision Counsel. 26 US Code 3101 – Rate of Tax
Tips count as wages for FICA. If you earn $20 or more in tips in a calendar month from a single employer, those tips are subject to Social Security and Medicare withholding, and they count toward the $200,000 Additional Medicare threshold.8Internal Revenue Service. Tip Recordkeeping and Reporting
If You Also Work for Yourself
Self-employed workers pay both the employee and employer shares: 12.4 percent for Social Security up to the $184,500 wage base and 2.9 percent for Medicare, for a combined 15.3 percent on net earnings.4Social Security Administration. Contribution and Benefit Base The 0.9 percent Additional Medicare Tax applies to self-employment income above the same filing-status thresholds.6Internal Revenue Service. Questions and Answers for the Additional Medicare Tax You can deduct half of your self-employment tax when calculating adjusted gross income, which offsets the fact that a W-2 employee never sees the employer half hit their taxable wages in the first place. The deduction covers the 12.4 percent Social Security portion and the 2.9 percent Medicare portion, but not the 0.9 percent Additional Medicare Tax.
Can You Opt Out
For almost everyone, no. Federal law does not let you decline these taxes even if you are confident you could invest the money more profitably yourself. A few narrow exceptions exist, and each one trades tax savings for the benefits those taxes fund:
- Members of qualifying religious groups that have provided for their own members since before 1951 and object to insurance benefits can apply for exemption on IRS Form 4029. Approval means waiving all rights to Social Security and Medicare benefits.9Internal Revenue Service. Form 4029, Application for Exemption From Social Security and Medicare Taxes and Waiver of Benefits
- Nonresident alien students and scholars on F-1, J-1, or M-1 visas for fewer than five calendar years are generally exempt from FICA on wages tied to their visa purpose. The exemption ends when you become a resident alien or change to a non-exempt status.10Internal Revenue Service. Foreign Student Liability for Social Security and Medicare Taxes
- Students enrolled at least half-time and working for their own school may be exempt if the work is connected to their studies and they are not classified as professional employees receiving benefits like retirement contributions or paid vacation.11Internal Revenue Service. Student FICA Exception
Outside those categories, participation is mandatory.
Where the Money Goes
FICA revenue does not land in the government’s general fund with income tax dollars. By law, Social Security taxes go into two trust funds, one for retirement and survivor benefits and one for disability benefits, and Medicare’s 1.45 percent flows into a separate Hospital Insurance Trust Fund.12Social Security Administration. What Are the Trust Funds Those funds can only be spent on benefits and the administrative costs of running the programs.
When a trust fund collects more in a year than it pays out, the surplus is invested in special-issue Treasury bonds backed by the full faith and credit of the U.S. government.12Social Security Administration. What Are the Trust Funds A board of six trustees chaired by the Secretary of the Treasury oversees the funds and publishes an annual report on their financial condition.13U.S. Department of the Treasury. Social Security and Medicare Trustees Reports Those reports have projected shortfalls in coming decades without legislative changes, which is why debates about raising the wage base or adjusting benefit formulas surface periodically.
The legal framework traces back to the Federal Insurance Contributions Act, codified in Chapter 21 of the Internal Revenue Code. The Supreme Court upheld the constitutionality of these payroll taxes in 1937, ruling that Congress has the authority to levy taxes to fund national social insurance programs.14Social Security Administration. Justice Cardozo – Helvering vs Davis The system has operated continuously since. Each deduction on your paycheck is a contribution to that same insurance pool, and it is the reason you can expect a check back when you retire, become disabled, or reach the age when Medicare picks up your hospital bills.