A REST API designed for calculating US federal, state, and local income taxes for the year 2026. It provides deterministic responses with source attribution, requires no API key, and allows up to 60 requests per minute from a single address.
Build a salary take-home calculator for job offers, a payroll preview for small businesses, or a city-to-city tax comparison tool. You get federal, state and local tax breakdowns with the source document and verification date for every figure. Responses are cache-friendly and the API can be called from browsers or servers. If you need higher volumes or an SLA, paid business solutions are available.
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