Every paycheck, 6.2% of your wages goes to Social Security — a program you may not collect from for decades. Here's how the tax works, what it pays for, and when it stops coming out of your check.
The Basic Rate
The Social Security tax rate for employees is 6.2% of gross wages. Your employer pays another 6.2% on your behalf, for a combined contribution of 12.4% toward your eventual Social Security benefit.
This tax is sometimes labeled "OASDI" on pay stubs — Old-Age, Survivors, and Disability Insurance — which describes the three types of benefits it funds.
The Wage Base Limit
Unlike Medicare, Social Security tax doesn't apply to your entire income. It only applies up to the Social Security wage base:
- 2025 wage base: $176,100
- Any wages above this threshold are not subject to the 6.2% tax
- The maximum you can pay in 2025: $176,100 × 6.2% = $10,918.20
When Does Social Security Stop Coming Out?
Once your year-to-date earnings hit $176,100, your employer stops withholding Social Security tax for the remainder of the year. This typically benefits high earners in Q3 or Q4, effectively giving them a small "raise" in take-home pay for the rest of the year.
Worked multiple jobs? Each employer withholds Social Security independently. If your combined wages from multiple employers exceed $176,100, you'll have overpaid Social Security. You can claim the excess as a credit on your federal tax return.
How Social Security Benefits Are Calculated
Your eventual benefit is based on your highest 35 years of inflation-adjusted earnings. The more you pay in, the more you're entitled to receive — though the formula is weighted to give lower-income workers a higher replacement rate.
You can check your estimated benefit at SSA.gov using your earnings history.
Does Social Security Tax Apply to Pre-Tax Deductions?
No. Unlike federal income tax, Social Security is calculated on your gross wages before most pre-tax deductions. A 401(k) contribution reduces your income tax but does not reduce your Social Security or Medicare tax.
Self-Employment
If you're self-employed, you pay both the employee and employer portions — that's 12.4% for Social Security (plus 2.9% Medicare = 15.3% total self-employment tax). You can deduct half of this on your income tax return.
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