Social Security Tax Explained (2026): How Much You Pay, When It Stops, and How to Check Your Pay Stub

If you’ve ever stared at your pay stub and wondered why a line called “Social Security” (or “OASDI”) takes money out of every paycheck, here’s the simple answer: Social Security tax is a payroll tax. It’s separate from federal income tax withholding, and it follows a mostly fixed formula.

This guide gives you the real numbers so you can sanity-check your withholding in about a minute.

What Social Security tax is (in plain English)

Social Security tax funds the Social Security program (retirement, disability, and survivors benefits). For most W-2 employees, it’s automatically withheld from each paycheck as part of FICA.

On a typical pay stub, you’ll see either:

• Social Security
• OASDI (same thing)
• Sometimes “FICA-SS” or similar

Your employer also pays a matching 6.2% on top of your pay (you don’t see the employer side on your paycheck).

The rate and the wage base cap (the numbers that matter)

Here are the two numbers you need to know:

• Rate: 6.2% (employee share)
• Wage base limit: Social Security only applies up to an annual wage base. Using the commonly cited $176,100 wage base (2025) for illustration, wages above that limit are not subject to Social Security tax for the rest of that calendar year (with the same employer).

That also means there’s a clean “max” you can pay as an employee:

How much you pay at common salary levels (with a table)

Below is the employee Social Security tax (6.2%) at common salary levels. Biweekly assumes 26 paychecks/year.

Why “varies” at $220k? Because you don’t pay Social Security tax evenly all year if you hit the cap mid-year. Once your year-to-date wages reach the wage base, the Social Security line typically drops to $0 for the rest of the year — and your paycheck jumps by about 6.2% of your wages.

Want your full take-home pay (including state income tax and benefits)? Use a state calculator — for example California and Texas are a dramatic comparison because California has state income tax and Texas doesn’t.

Where to find it on your pay stub (Social Security vs OASDI)

To verify Social Security tax withholding, you only need two pay stub numbers:

• Gross wages for the pay period (sometimes called “gross pay”)
• The Social Security/OASDI withholding amount

Do this quick math check:

• Expected Social Security tax ≈ gross wages × 0.062

You won’t match to the penny every time (rounding happens), but you should be close.

Common surprises: two jobs, job changes, and “why did my paycheck jump?”

1) “I had two jobs, and Social Security got withheld twice.”

This is the most common reason people overpay. Each employer withholds Social Security as if they’re your only employer. If your combined wages across employers exceed the wage base, you may be able to claim the excess back when you file your Form 1040.

2) “I switched jobs and my withholding reset.”

Same idea. A new employer starts withholding Social Security again because they don’t know what you earned earlier in the year somewhere else.

3) “My paycheck got bigger near the end of the year.”

If your salary is high enough to hit the wage base, Social Security withholding stops with that employer for the rest of the year. Medicare usually continues, so the increase won’t be the full 7.65% FICA — it’s mainly the 6.2% Social Security portion.

How to put this to work (3 steps)

1) Find the line item. On your pay stub, locate Social Security / OASDI / FICA-SS and write down that amount.

2) Do the 30-second check. Multiply your gross pay for the period by 0.062. If you’re far off, ask payroll what wage amount they used.

3) If you had multiple jobs, flag a possible overpayment. If your combined wages for the year could exceed the wage base limit, keep your final pay stubs and W-2s. You may be able to claim excess Social Security tax back on Form 1040.