Social Security is taken out of your paycheck because the Federal Insurance Contributions Act requires it. Under FICA, your employer withholds 6.2% of your gross wages for Social Security and sends a matching 6.2% from the business’s own funds, producing a combined 12.4% rate on your earnings up to $184,500 in 2026.1Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates2Social Security Administration. Contribution and Benefit Base That money funds the retirement, survivor, and disability benefits you or your family may eventually collect. The same paycheck line usually bundles in a separate Medicare tax, which is why the total deduction you see is bigger than 6.2%.
The Law That Requires the Withholding
FICA is codified in Chapter 21 of the Internal Revenue Code, and it splits the cost of Social Security and Medicare between workers and employers.3Office of the Law Revision Counsel. 26 USC Ch. 21 Federal Insurance Contributions Act The underlying program traces to the Social Security Act of 1935, signed during the Great Depression to create a pension system for elderly workers who could not support themselves.4Internal Revenue Service. Understanding Taxes – Theme 2: Taxes in U.S. History – Lesson 4: The Social Security Act of 1935 FICA is how the money is collected. Your employer acts as the collection agent, responsible for withholding the tax from your pay and sending it to the IRS.
How Much Comes Out and What Wages It Applies To
Your share of the Social Security tax is 6.2% of gross wages. On your pay stub it usually appears as “OASDI” (Old-Age, Survivors, and Disability Insurance) or simply “Social Security.” Your employer’s matching 6.2% does not appear on your stub, but it is reported on your W-2 and the employer’s own filings.
The 6.2% applies to most compensation: hourly wages, salary, bonuses, commissions, and vacation pay. Tips are covered too. If you receive $20 or more in cash tips in a month, you have to report them to your employer, who then withholds Social Security and Medicare tax on those tips from your other wages.5Internal Revenue Service. Tip Recordkeeping and Reporting
Some pre-tax payroll deductions reduce the wages subject to Social Security tax; some don’t. Health insurance premiums and flexible spending account contributions run through a Section 125 cafeteria plan are generally excluded from FICA wages, so they cut both your income tax and your Social Security tax.6Internal Revenue Service. FAQs for Government Entities Regarding Cafeteria Plans Traditional and Roth 401(k) contributions are different. They can lower your income tax bill, but they are still subject to Social Security and Medicare withholding.7Internal Revenue Service. Retirement Plan FAQs Regarding Contributions
The Cap That Stops the Deduction
You do not pay Social Security tax on every dollar you earn. Each year there is a taxable wage base that limits how much of your income is subject to the 6.2%. For 2026 the cap is $184,500.2Social Security Administration. Contribution and Benefit Base Once your year-to-date earnings reach that number, the Social Security portion of your withholding stops for the rest of the calendar year, and so does your employer’s match. Anything above the cap is free of Social Security tax, though not Medicare tax.
The cap adjusts each year with the national average wage index. It was $176,100 in 2025 and $168,600 in 2024. It resets every January 1, so withholding starts fresh at the beginning of each year regardless of what you earned before. An employee who hits or passes the 2026 cap will contribute a maximum of $11,439 in Social Security tax that year, with the employer matching the same amount.
The Medicare Piece on the Same Line
FICA also includes a Medicare hospital insurance tax. You and your employer each pay 1.45% of your wages for Medicare, and there is no wage base cap: every dollar you earn is subject to it.1Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates Combined with Social Security, the standard FICA bite out of your paycheck is 7.65%.
Higher earners pay an extra 0.9% Medicare surtax on wages above certain thresholds. Your employer starts withholding the additional 0.9% once your wages with that employer pass $200,000 in the calendar year, but the threshold that ultimately applies to you depends on filing status:8Internal Revenue Service. Topic No. 560, Additional Medicare Tax
- Married filing jointly: $250,000
- Married filing separately: $125,000
- All other filers: $200,000
Only the employee pays the extra 0.9%. Employers do not match this portion.9Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
Where the Money Goes and What You Get for It
Social Security taxes are deposited into two federal trust funds run by the Treasury. The Old-Age and Survivors Insurance (OASI) Trust Fund pays retirement and survivor benefits. The Disability Insurance (DI) Trust Fund pays disability benefits.10Social Security Administration. What Are the Trust Funds? Money not needed to pay current-year benefits is invested in special Treasury bonds that earn a guaranteed interest rate.11Social Security Administration. Social Security Trust Fund Data Federal law restricts these funds to paying benefits and administering the program.
Your eligibility for future benefits depends on earning “credits” through the FICA taxes withheld from your paychecks. In 2026 you earn one credit for every $1,890 in covered earnings, up to four credits per year. You generally need 40 credits, roughly 10 years of work, to qualify for retirement benefits.12Social Security Administration. Benefits Planner – Social Security Credits and Benefit Eligibility Younger workers can qualify for disability or survivor benefits with fewer credits, depending on their age. The DI fund is available to workers who cannot perform substantial gainful activity because of a medical condition expected to last at least 12 months or result in death.13Social Security Administration. Code of Federal Regulations 404.1509 – How Long the Impairment Must Last
If You Work for Yourself
If you are a freelancer, sole proprietor, or independent contractor, no employer is withholding for you, but you still owe the tax. You pay both halves under the Self-Employment Contributions Act at 26 U.S.C. ยง 1401: 12.4% for Social Security and 2.9% for Medicare, for a combined 15.3% self-employment tax rate.14Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax
You do not apply that rate to your entire net profit. The IRS first reduces your net earnings to 92.35% of the total before calculating the tax, and you can deduct half of the self-employment tax when figuring your adjusted gross income on your income tax return.15Internal Revenue Service. Topic No. 554, Self-Employment Tax16Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The same $184,500 wage base applies to the Social Security portion. You calculate the tax on Schedule SE with your Form 1040 and typically pay it in quarterly estimated installments.17Internal Revenue Service. About Schedule SE (Form 1040), Self-Employment Tax
Two Jobs and Overpaying
If you hold more than one job in the same year, each employer withholds Social Security tax independently based only on the wages it pays you. Neither knows about the other. When your combined wages exceed the $184,500 wage base, you can overpay Social Security tax for the year. You claim the excess as a credit on your federal income tax return, using the worksheet in the Form 1040 instructions.18Internal Revenue Service. Topic No. 608, Excess Social Security and RRTA Tax Withheld Employers do not get back their matching contributions; each employer’s 6.2% is based only on what it paid you.
Who Doesn’t Pay FICA
Most workers see FICA withholding on every paycheck of their career. A few narrow categories are exempt:
- Students enrolled at least half time who work for the same college or university, where the work is connected to the course of study and the student is not a career employee eligible for benefits like retirement plans or paid leave.19Internal Revenue Service. Student FICA Exception
- Foreign students and scholars in F-1, J-1, M-1, or Q-1 visa status, on wages earned for work permitted under the visa, as long as they remain nonresident aliens for tax purposes.20Internal Revenue Service. Aliens Employed in the U.S. – Social Security Taxes
- Members of recognized religious groups that have provided for their members since before 1951 and oppose insurance benefits, who apply on Form 4029 and waive all rights to Social Security and Medicare benefits.21IRS.gov. Form 4029 Application for Exemption From Social Security and Medicare Taxes and Waiver of Benefits
- Workers covered by a foreign social security system under a totalization agreement between the United States and their country.22Office of the Law Revision Counsel. 26 U.S. Code 3101 – Rate of Tax
Checking What’s Been Credited to You
Because your future benefits depend on the wages reported under your Social Security number, it’s worth checking your earnings record now and then. The Social Security Administration offers a free “my Social Security” account at ssa.gov. Your statement shows your year-by-year earnings history, estimated future benefits at various retirement ages, and instructions for reporting an error.23Social Security Administration. Get Your Social Security Statement If a year looks off, pull your W-2s or tax returns for that period and contact the SSA to request a correction. Fixing gaps early protects the benefit amount you will eventually receive.