Employer Cost API

What it does

Employer Cost API calculates the true cost-to-employer for any U.S. worker. It includes employer payroll taxes (Social Security, Medicare, FUTA, SUTA), workers’ comp, employer-paid benefits, retirement match, PTO cost, and full annual and per-period breakdowns. Designed for HR SaaS, payroll tools, finance apps, and startups that need accurate compensation modeling. Simple JSON output, fast responses, and clean developer experience.

Employer Cost API is a production-ready employer payroll cost calculator for the United States. Instead of focusing on take-home pay, the API reveals what a company actually spends on each employee: payroll taxes (Social Security, Medicare, FUTA), per-state SUTA and workers’ comp, employer-paid healthcare/dental/vision, retirement match, and the dollar value of PTO. Built on Next.js Edge functions

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