FICA
Category: Payroll & withholding · Related form: Form W-2
Federal Insurance Contributions Act taxes: Social Security (6.2% employee) and Medicare (1.45% employee), plus Additional Medicare Tax above wage thresholds.
How FICA fits 2026 planning
FICA sits inside payroll withholding, FICA wage bases, and the difference between a paycheck estimate and annual liability. For tax year 2026, US Tax Tools treats year-scoped constants (brackets, contribution limits, wage bases, credit schedules) as separate datasets — so explanations of FICA should be read with the same year selected in any linked calculator.
Category focus: Payroll & withholding. Readers usually land on this page while comparing a paycheck estimate, a credit phaseout, or a retirement contribution room figure that depends on understanding FICA first.
Worked example
On $50,000 of Social Security wages, employee Social Security tax is $3,100 and Medicare tax is $725 before any Additional Medicare Tax.
Treat the example as a teaching sketch, not a filing position. Change filing status, state residency, or mid-year events and the same definition of FICA can produce a different cash outcome even when the glossary text stays the same.
What to watch for
Definitions of FICA can differ slightly across IRS publications, SSA rules, Marketplace subsidy worksheets, and state agencies. When two programs both say “income,” confirm which modification rules apply — MAGI for one credit is not always MAGI for another.
Legislation and inflation adjustments can move the dollar thresholds around FICA without renaming the concept. Prefer the effective date on the primary source (Rev. Proc., SSA notice, USDA table, or state DOR bulletin) over any blog summary — including this one if a later notice supersedes it.
On a filed return, FICA most often surfaces around Form W-2. Read the official IRS instructions for that form for the tax year you are filing — glossary pages summarize concepts; they do not replace line-by-line worksheets.
You may also see this concept labeled as payroll tax, Social Security and Medicare tax. Search engines and payroll portals sometimes use those aliases interchangeably with “FICA.”
Next step
When you are ready to model numbers, open the FICA related calculator on US Tax Tools. Engines keep tax-year datasets separate so a 2025 habit does not silently reuse a 2026 constant.
Related reading: Tax insights for longer 2026 explainers, Methodology for how engines store cents and traces, and Disclaimer for educational-use limits.