If you see OASDI listed on your paycheck, it refers to your Social Security tax deduction.
OASDI stands for:
Old-Age, Survivors, and Disability Insurance
It is the official name of the Social Security program administered by the federal government.
On your paystub, OASDI is the portion of your wages that is being withheld to fund:
• Retirement benefits
• Disability benefits
• Survivor benefits for family members
Most employees in the United States pay OASDI tax automatically through payroll deductions.
Is OASDI the Same as Social Security?
Yes.
On a paycheck, OASDI and Social Security tax mean the same thing.
Some payroll systems label the deduction as:
• OASDI
• Social Security
• Soc Sec
• SS Tax
• FICA SS
They all refer to the same federal program.
The Social Security Administration (SSA) uses the term OASDI in official documentation, which is why many payroll systems display it that way.
How Much Is OASDI Tax in 2026?
For 2026, the OASDI tax rate is:
6.2% of your gross wages
This applies to employees.
Your employer also pays an additional 6.2% on your behalf.
That means a total of 12.4% is contributed to Social Security, but you only see 6.2% deducted from your paycheck.
There is a wage limit (called the Social Security wage base). Once your income exceeds that limit for the year, OASDI stops being deducted.
For 2026, the Social Security wage base limit is set annually by the SSA. Earnings above that cap are not subject to OASDI tax.
Why Is OASDI Taken Out of My Paycheck?
OASDI funds three major federal benefit programs:
Retirement Benefits
When you reach retirement age, your lifetime contributions determine your monthly Social Security payment.
Disability Insurance (SSDI)
If you become disabled and meet eligibility requirements, OASDI funds disability payments.
Survivor Benefits
If a worker dies, certain family members may receive survivor benefits funded by OASDI taxes.
The tax is mandatory for most employees in the United States.
Does OASDI Reduce My Take-Home Pay?
Yes.
OASDI is a mandatory federal payroll tax.
It is deducted from your gross wages before you receive your net pay.
Example:
If you earn $1,000 in gross pay:
6.2% OASDI = $62 deducted
Your take-home pay will be reduced by that amount, along with any other taxes or deductions.
Is OASDI Pre-Tax or Post-Tax?
OASDI is a payroll tax, not a voluntary deduction.
It is calculated on your taxable wages before income tax is applied.
However, it is not a “pre-tax benefit” like a 401(k) contribution. It is a required federal tax under FICA (Federal Insurance Contributions Act).
What Is the Difference Between OASDI and Medicare?
You may see both of these on your paycheck:
• OASDI (Social Security tax)
• Medicare (Med tax)
They are separate payroll taxes under FICA.
OASDI:
6.2% employee rate
Subject to a wage cap
Medicare:
1.45% employee rate
No wage cap
High earners pay an additional Medicare tax
Both are mandatory for most workers.
Why Did My OASDI Deduction Stop?
If you notice OASDI deductions stopped during the year, the most common reason is:
You reached the annual Social Security wage base limit.
Once you exceed that income threshold, the 6.2% deduction no longer applies for the rest of the calendar year.
It resets the following January.
Who Does Not Pay OASDI?
Some workers may not see OASDI deductions, including:
• Certain state and local government employees with alternative retirement systems
• Some federal employees hired before 1984
• Certain nonresident aliens
• Members of specific religious groups with approved exemptions
However, most private-sector employees are required to pay OASDI.
Where Can I Verify OASDI Information?
Official sources:
Social Security Administration (SSA)
Internal Revenue Service (IRS)
You can review your personal Social Security earnings record by creating an account at SSA.gov.
Quick Summary
OASDI on your paycheck means:
• It is your Social Security tax
• The rate is 6.2% of wages (up to the annual limit)
• Your employer matches your contribution
• It funds retirement, disability, and survivor benefits
• It reduces your take-home pay
If you see OASDI on your paystub, it is a standard federal payroll deduction for Social Security.