The rate
6.2 percent on wages up to the annual Social Security wage base. The base is set annually by the SSA and indexed to inflation. Once your year-to-date wages with all employers (yes, all combined for self-reporting purposes) exceed the base, Social Security tax stops for the rest of the calendar year.
The wage base in practice
For 2024 the wage base was $168,600. Verify the current year at ssa.gov. A high earner who hits the base in October sees Social Security tax stop in November and December, then start again January 1.
Employer match
Your employer pays an equal 6.2 percent on the employer side. So Social Security is funded by 12.4 percent total per worker, capped at the wage base each year.
What it funds
Old Age, Survivors and Disability Insurance (OASDI). Retirement benefits. Disability benefits for workers and certain dependents. Survivor benefits.
How it shows on your stub
Usually a line labeled SOC SEC, OASDI, or SS. The amount equals 6.2 percent of your paycheck wages, capped once you hit the base.