Learn / Social Security tax
Social Security tax on your paycheck, explained
Unlike federal income tax, Social Security tax isn't progressive — it's a flat rate, but only up to a point. Here's exactly how it's calculated in 2026.
The rate: a flat 6.2%
Employees pay 6.2% of their wages toward Social Security, and employers match that with another 6.2% — 12.4% total, though only your half shows up as a deduction on your pay stub. Self-employed workers pay both halves themselves through self-employment tax.
The wage base cap: where it stops
Social Security tax only applies up to an annual limit — the wage base — which is $184,500 for 2026. Once your year-to-date wages cross that line, Social Security withholding stops for the rest of the calendar year. It starts again from zero the following January.
This is why a high earner's paycheck sometimes noticeably increases late in the year — the 6.2% that had been coming out simply disappears once the cap is hit.
What it does and doesn't fund
Social Security tax funds retirement, disability, and survivor benefits — it's a dedicated program, not general tax revenue. Your eventual benefit amount is based on your highest-earning working years, which is part of why the wage base exists: earnings above it aren't taxed for this program, but they also don't increase your future benefit.
Seeing it on your own numbers
The calculator below applies the exact 2026 rate and wage base automatically — enter your salary to see precisely how much Social Security tax comes out of each check, and whether you're near the annual cap.