OASDI on your paycheck is the Social Security tax: 6.2% of your gross wages, withheld by your employer and sent to the federal government to fund Old-Age, Survivors, and Disability Insurance. It sits next to a smaller Medicare line, and together the two make up FICA, which totals 7.65% of your pay.1Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates Some pay stubs label it “OASDI/EE” or just “Social Security”; it’s the same deduction.
The Social Security Administration runs the program, and roughly 68 million Americans receive a monthly benefit from it.2Social Security Administration. Mission and Structure Nearly every worker and employer in the country is required to participate.
What the 6.2% Pays For
OASDI bundles three separate protections, each funded through its own trust fund under federal law.3Office of the Law Revision Counsel. 42 U.S.C. Chapter 7 – Social Security, Section 401 Trust Funds The letters stand for the three pieces.
Old-Age (Retirement)
If you’ve paid into the system long enough, you can start collecting a monthly retirement check as early as age 62, though claiming that early permanently reduces the amount. The maximum monthly benefit for someone claiming at full retirement age in 2026 is $4,152.4Social Security Administration. What Is the Maximum Social Security Retirement Benefit Payable
Survivors
When a worker who paid Social Security taxes dies, certain family members can draw monthly benefits based on that worker’s earnings record. Eligible survivors include a spouse or ex-spouse (if the marriage lasted at least 10 years), unmarried children under 18, adult children disabled before age 22, and dependent parents age 62 or older.5Social Security Administration. Who Can Get Survivor Benefits Every covered worker carries this protection automatically.
Disability
Workers with a severe medical condition that prevents substantial work can qualify for monthly disability payments. The law defines disability as the inability to perform substantial gainful activity because of a physical or mental impairment expected to last at least 12 continuous months or result in death.6Office of the Law Revision Counsel. 42 U.S.C. 423 – Disability Insurance Benefit Payments The threshold is strict: you must be unable to perform not just your prior job, but any kind of work that exists in significant numbers in the national economy. In 2026, someone earning more than $1,690 a month ($2,830 if blind) is generally treated as performing substantial gainful activity and won’t qualify.7Social Security Administration. Substantial Gainful Activity
How Much Comes Out, and When It Stops
Your employer withholds 6.2% of your gross wages and pays a matching 6.2% out of its own pocket, for a combined 12.4% going to Social Security on your earnings.8Office of the Law Revision Counsel. 26 U.S.C. 3101 – Rate of Tax The withholding stops once your year-to-date earnings hit the wage base limit, which is $184,500 in 2026.9Social Security Administration. Contribution and Benefit Base Cross that line and your take-home pay bumps up for the rest of the year. Medicare has no such cap and keeps coming out on every dollar.
The wage base cuts both ways. Earnings above $184,500 don’t get taxed, but they also don’t count toward your future benefit. That’s why higher salaries don’t translate into proportionally larger Social Security checks: the program replaces a share of average career earnings up to the cap, and no more.9Social Security Administration. Contribution and Benefit Base
If you’re self-employed, you’re on the hook for both halves. Under the Self-Employment Contributions Act, you owe the full 12.4% on your net self-employment earnings, though the tax code lets you deduct half of that when calculating your adjusted gross income.10Social Security Administration. What Are FICA and SECA Taxes
The taxes your employer withholds and matches are reported and deposited to the IRS through quarterly Form 941 filings. From there the money flows into the Treasury and is credited to the Social Security trust funds, which are kept separate from the government’s general revenue.11Social Security Administration. Tax Transfers and Adjustments
What You’re Building Up by Paying It
Paying OASDI tax earns you credits toward future benefits. In 2026, you get one credit for every $1,890 in wages or self-employment income, up to four credits a year.12Social Security Administration. Quarter of Coverage Retirement benefits require 40 credits, or about 10 years of covered work.
Disability and survivor coverage have lower thresholds, especially for younger workers. Someone under 24 may qualify for disability with as few as six credits earned in the three years before the disability began.13Social Security Administration. Benefits Planner – Social Security Credits and Benefit Eligibility That keeps the program reachable for people who get seriously ill or hurt early in their careers.
Will the Money Still Be There?
The combined Social Security trust funds are projected to run short of full reserves in 2034, according to the 2025 Trustees Report. Once that happens, incoming payroll taxes would still cover about 81% of scheduled benefits.14Social Security Administration. The 2025 Annual Report of the Board of Trustees Benefits wouldn’t disappear; the program would only be able to pay out what it collects in real time unless Congress acts before then.
The program has faced similar funding gaps before and Congress has adjusted tax rates, benefit formulas, and the retirement age to close them. Whether that happens again, and how, is a legislative question without a clear answer yet. One thing worth understanding about the money leaving your paycheck: the OASDI taxes workers pay today fund current retirees’ checks. It isn’t set aside in a personal account with your name on it. The system has always worked this way.