What is the formula for OASDI (Social Security Tax)?

OASDI (Social Security Tax) does not have a single closed-form formula; the definition above explains the mechanics.

Can you give an example of OASDI (Social Security Tax)?

See the definition above for typical use cases of OASDI (Social Security Tax) in personal finance.

When does OASDI (Social Security Tax) apply?

OASDI (Social Security Tax) is used when working through tax decisions. The definition above describes the typical context.

What category does OASDI (Social Security Tax) fall under?

OASDI (Social Security Tax) is part of the tax category in the CalcFi glossary.

Which calculators use OASDI (Social Security Tax)?

Related calculators on CalcFi: Paycheck Calculator.

Where does the OASDI (Social Security Tax) definition come from?

Definitions in the CalcFi glossary are written by the CalcFi editorial team and cross-checked against IRS, Federal Reserve, BLS, and Investopedia conventions.

Is OASDI (Social Security Tax) the same as related terms?

OASDI (Social Security Tax) is closely related to other tax concepts. See the Related Terms section on this page for direct comparisons.

Does this glossary entry replace professional advice?

No. The CalcFi glossary is educational reference material. It is not personalized tax, legal, or investment advice. For decisions with material consequences, consult a licensed professional.

Definition

OASDI (Social Security Tax)

The Social Security portion of FICA — 6.2% on wages up to an annual cap, matched by your employer.

Written by Jere SalmistoReviewed by CalcFi EditorialLast verified: 2026-05-13

What Is OASDI (Social Security Tax)?

Old-Age, Survivors, and Disability Insurance (OASDI) is the formal name of the Social Security payroll tax. It funds retirement, survivor, and disability benefits. The 6.2% rate applies only up to the annual wage base ($176,100 in 2025); earnings above the cap are not subject to OASDI.

Related Terms

FICA

Federal payroll tax that funds Social Security and Medicare. Employees pay 7.65% of wages; employers match it.

Social Security

A U.S. government program providing retirement, disability, and survivor benefits.

Related Calculators

Paycheck Calculator→

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