FICA Tax Calculator

Written by Great Medico

Updated September 25, 2026 •3 min read

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Small changes in rates, timing, or amounts can materially change a finance result. FICA Tax Calculator estimates employee payroll taxes from wages, the Social Security rate and wage base, Medicare rate, additional Medicare rate and threshold, and employment mode shown, which makes the assumptions easier to test side by side.

What this calculator does

FICA Tax Calculator estimates employee payroll taxes from wages, the Social Security rate and wage base, Medicare rate, additional Medicare rate and threshold, and employment mode shown. The visible inputs are annual wages subject to payroll tax, social security rate, social security wage base, medicare rate, additional medicare rate, additional medicare threshold, and employment type. Its result is driven by those values, so the calculation can be reproduced or stress-tested without relying on a hidden live-data feed.

How to use it

Enter Annual wages subject to payroll tax, Social Security rate, Social Security wage base, Medicare rate, Additional Medicare rate, Additional Medicare threshold, and Employment type. Keep all monetary inputs in the same currency; the currency selector formats results and does not perform foreign-exchange conversion. Before calculating, recheck Annual wages subject to payroll tax, Social Security rate, Social Security wage base against the source values you intend to model. Use the labels on FICA Tax Calculator as the source of truth and recheck any prefilled value before relying on the result.

How the calculation works

Social Security tax applies the entered Social Security rate up to the entered wage base. Medicare applies its rate to covered wages, and the additional Medicare rate applies above the entered threshold. The calculator combines those components for the modeled payroll-tax total. FICA Tax Calculator applies that relationship only to the inputs represented on its form. If the result looks surprising, verify the entered values, units, and signs before interpreting the number.

Example

For wages below the Social Security wage base, both Social Security and Medicare components are calculated on the entered wages. Once wages exceed the wage base, the Social Security portion stops increasing while Medicare can continue. The example is a math check for FICA Tax Calculator; replace the sample values with your own inputs rather than treating the example as a target or recommendation.

How to interpret the result

The effective payroll-tax rate can change as wages cross the Social Security wage base or the additional-Medicare threshold. The result is easier to understand by reading the Social Security and Medicare components separately. A change in the result should be traced back to the input that changed before you draw a practical conclusion.

Limitations and notes

Rates and wage bases are year-specific, and self-employment tax has additional deduction and income-tax interactions. The IRS currently publishes the governing annual figures; use the current-year values rather than assuming old defaults remain valid. The safest way to reuse this calculation later is to keep the source values and date with the result.