OASDI is the Social Security program that FICA taxes fund

OASDI stands for Old Age, Survivors, and Disability Insurance. It is the formal name for Social Security. When you see OASDI on your pay stub, it means the money withheld is going into the Social Security trust fund — the same fund that pays retirement benefits, survivor benefits for your family if you die, and disability benefits if you become unable to work.

FICA is the tax mechanism that funds OASDI. Your employer withholds OASDI tax from your paycheck and sends it to the federal government. Self-employed people pay both the employee and employer portions. The money you pay in now builds your record of earnings, which determines how much you receive later.

The two terms are often used together because they are inseparable in practice: FICA is the tax, OASDI is the program it funds. Your pay stub may list them separately or together depending on how your employer formats it.

Key Takeaways

  • OASDI is Social Security; FICA is the payroll tax that funds it, so you will see both names on your pay stub.
  • The OASDI portion of FICA is 6.2 percent of your wages up to a yearly earnings cap; your employer pays an equal amount.
  • Every dollar you pay in OASDI tax builds your Social Security earnings record, which determines your future benefit amount.
  • OASDI covers retirement, survivor benefits for your family, and disability — three separate programs under one name.

How much OASDI tax comes out of your paycheck

Your employer withholds 6.2 percent of your gross wages for OASDI, up to a maximum yearly earnings amount. That cap changes each year — in 2024 it was $168,600, meaning once you earn that much in a calendar year, no more OASDI tax is withheld from your remaining paychecks that year. Your employer also pays 6.2 percent on your behalf, so the total OASDI contribution is 12.4 percent when you count both sides.

Self-employed people pay both portions themselves — 12.4 percent total — though they can deduct half of it as a business expense on their tax return. The earnings cap applies to self-employed income the same way it does to wages.

If you work for multiple employers in the same year, each one withholds 6.2 percent up to the cap. If your combined earnings exceed the cap, you may have overpaid OASDI tax; you can claim the overpayment as a credit when you file your income tax return.

What OASDI actually covers

OASDI is three programs in one. Retirement is the most familiar: you become may be able to access at a certain age (currently 62 to 67 depending on your birth year) and receive a monthly benefit based on your lifetime earnings record. The longer you wait to claim, up to age 70, the larger your monthly payment.

Survivor benefits go to your family members if you die — your spouse, your children under 19 (or 23 if still in high school), and sometimes your parents if you were supporting them. They do not have to be working or paying FICA taxes themselves; they receive benefits based on your earnings record.

Disability benefits (SSDI) go to you if you become unable to work due to a medical condition expected to last at least 12 months or result in death. You do not have to reach retirement age to receive them. Your family members may also receive benefits on your record while you are receiving disability.

Why OASDI appears on your pay stub separately from other taxes

OASDI is listed separately because it has its own earnings cap and its own trust fund. Income tax withholding has no cap — you pay it on all your earnings. Medicare tax (the other part of FICA) has no cap either, though there is an additional Medicare tax of 0.9 percent on earnings above $200,000 for single filers. OASDI is the only one with a yearly ceiling, so employers track it separately to know when to stop withholding.

The separate line item also makes it easier to see how much of your FICA payment is going toward Social Security versus Medicare. Some people track this to understand their future benefit amounts, since your OASDI benefit is based only on the earnings you paid OASDI tax on.

How your OASDI record builds over time

Social Security tracks your earnings year by year. You need 40 credits to become may be able to access for any OASDI benefit — retirement, survivor, or disability. In 2024, you earn one credit for every $1,730 in wages (the amount changes yearly), and you can earn a maximum of four credits per year. This means you can build your 40 credits over 10 years of work, though you do not have to earn them consecutively.

Your actual benefit amount depends on your highest 35 years of earnings. Social Security calculates your Primary Insurance Amount (PIA) based on this record, then adjusts it for the age you claim. The more you earned and the longer you worked, the higher your benefit will be.

You can view your earnings record and benefit estimate by creating an account at ssa.gov. Social Security mails a statement to people not yet receiving benefits, though you can also check online. Reviewing your record periodically helps catch errors — if an employer reported your earnings incorrectly, you can request a correction.

The difference between OASDI and SSI

OASDI and SSI (Supplemental Security Income) are often confused because both are Social Security programs, but they work differently. OASDI is an insurance program funded by FICA taxes; you receive benefits based on your own work record or your family member's record. SSI is a needs-based program funded by general tax revenue; you receive it based on your income and assets, not your work history.

You can receive both at the same time, though the rules for how they interact are complex. OASDI is what appears on your pay stub as a FICA deduction. SSI does not come from FICA and does not appear on your paycheck.

Frequently Asked Questions

Does OASDI tax go into a personal account with my name on it?

No. OASDI operates as a pay-as-you-go system: the taxes current workers pay fund the benefits current retirees and disabled people receive. Your OASDI earnings record tracks your work history and determines your benefit amount, but the money you pay in does not sit in an account waiting for you. When you become may be able to access, you receive benefits from the current OASDI tax revenue.

What happens to my OASDI taxes if I die before retirement?

Your family members may receive survivor benefits based on your earnings record — your spouse, children, and sometimes parents. The total amount they receive is limited to a family maximum, usually 150 to 180 percent of what your retirement benefit would have been. If no family members are may be able to access, the taxes you paid do not transfer to anyone else.

Can I get back the OASDI taxes I paid if I move out of the country?

No, you cannot get a refund of OASDI taxes. However, you may still be may be able to access for Social Security benefits if you meet the work requirements, even if you live abroad. Some countries have agreements with the United States that affect how benefits are paid. Contact Social Security directly to understand how living outside the U.S. affects your specific situation.

Why does my OASDI withholding stop partway through the year?

Once you earn the yearly maximum amount subject to OASDI tax (the cap), your employer stops withholding OASDI tax for the rest of that calendar year. This is normal and expected. If you worked for multiple employers and overpaid, you can claim the overpayment on your tax return.