Is FICA the Same as OASDI?

No. FICA includes both Social Security and Medicare payroll taxes, while OASDI is only the Social Security portion of FICA. On an employee’s pay stub, an OASDI deduction generally represents the employee’s Social Security tax withholding, not an extra tax in addition to FICA. Medicare withholding may appear separately as “Medicare” or “HI,” and together the OASDI and Medicare amounts make up the employee’s standard FICA withholding. The distinction matters because OASDI withholding applies only up to an annual Social Security wage limit, while standard Medicare tax applies to all wages. So if you see OASDI on a pay stub, it identifies one component of FICA rather than a separate payroll-tax category.

How Are FICA and OASDI Related?

FICA stands for the Federal Insurance Contributions Act. In payroll, FICA refers to the taxes that fund Social Security and Medicare. The IRS describes two components: Old-Age, Survivors, and Disability Insurance (OASDI), also called Social Security tax, and Hospital Insurance (HI), also called Medicare tax. The IRS explains both components in its guidance on FICA taxes.

OASDI is the formal name for the Social Security program funded by the Social Security portion of payroll taxes. Its benefits include retirement benefits, survivors benefits for eligible family members, and disability benefits for eligible workers. The Social Security Administration distinguishes OASDI from Medicare’s Hospital Insurance program in its FICA and SECA tax-rate guidance.

A simple way to remember the relationship is FICA = OASDI + Medicare. These terms describe different parts of one payroll-tax structure rather than competing names for the same deduction.

Why Do Pay Stubs Use Different Labels?

Payroll systems can display the same taxes in different ways. A pay stub might use “FICA” as a combined label, or it might list “Social Security” and “Medicare” separately. Some use the technical labels “OASDI” and “HI.” When the components are listed separately, the OASDI and Medicare lines together represent the employee’s FICA withholding.

An OASDI line generally identifies Social Security withholding rather than an additional charge. To understand how the amounts are presented, compare the deductions with the year-to-date totals on the stub. A pay stub guide can help explain where deductions and totals appear. For a related comparison, see how FICA differs from federal income tax.

What Are the Employee FICA Rates In 2026?

For 2026, the employee-side standard FICA rate is 7.65% in total. It consists of 6.2% for OASDI on wages up to the annual Social Security taxable maximum and 1.45% for Medicare on all wages. The Social Security Administration’s 2026 COLA fact sheet provides information about the annual adjustment and taxable maximum.

The 7.65% figure is the employee share. Employers generally pay a corresponding share of standard Social Security and Medicare taxes on employee wages. The two employee amounts may appear as separate deductions even though both are part of FICA.

Self-employed people generally pay Social Security and Medicare taxes under the Self-Employment Contributions Act, or SECA, rather than through standard employee FICA withholding. The payment process and applicable rules differ from paycheck deductions for employees. The Social Security Administration’s tax-rate information covers both FICA and SECA. For more on the distinction, see how independent contractors pay Social Security.

Why Does the OASDI Wage Limit Matter?

OASDI and Medicare apply differently as annual earnings rise. OASDI tax applies only to wages up to the Social Security taxable maximum for that year. Standard Medicare tax has no wage cap, so it continues to apply to wages above that maximum.

For example, an employee whose wages exceed the annual Social Security taxable maximum may have OASDI withheld from paychecks earlier in the year. Once the employee reaches the limit, OASDI withholding stops for the rest of that year. Standard Medicare withholding continues because it has no corresponding wage cap. A resulting change in take-home pay is expected under these rules and does not by itself mean payroll made an error.

Payroll teams track each employee’s year-to-date wages so OASDI withholding stops at the appropriate point. Accurate tracking helps prevent excess withholding or an incorrect deduction. Medicare withholding continues under its separate rule.

What Are Common Misunderstandings About FICA and OASDI?

“OASDI means all FICA taxes.” It does not. OASDI is the Social Security portion, while FICA includes both OASDI and Medicare.

“FICA means Social Security only.” People sometimes use FICA informally to mean Social Security withholding. Technically, FICA includes Medicare tax as well. The IRS’s FICA tax explanation identifies both components.

“Medicare tax is separate from FICA.” Medicare and Social Security are distinct taxes with different rules, but both are included in employee FICA.

“An OASDI deduction is an extra charge.” Usually it is simply the separately displayed Social Security portion of FICA withholding. It is not an additional tax on top of the Social Security and Medicare amounts.

What Should Employers Check in Payroll?

Employers should ensure payroll records distinguish the Social Security and Medicare components and apply the rules for each. In particular, payroll systems need to track year-to-date wages and stop OASDI withholding when an employee reaches the annual taxable maximum. Reviewing payroll reports can help identify unexpected deduction changes or errors in how the components are displayed.

Clear pay-stub labels and accurate records make deductions easier for employees to understand and for payroll teams to explain. Other deductions can also affect take-home pay, including pre-tax deductions.

*This article is for general informational purposes only and is not legal advice.