FinanceapiKeyHTTPSCORS
Finance
EstimateTax
US federal, state and local income tax calculation for 2026, with the source of every figure.
EstimateTax API is a free Finance API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
- Authentication
- None required
- HTTPS
- Yes
- CORS
- Yes
- Category
- Finance
Visit documentation ↗estimatetax.net
About EstimateTax
A REST API for US federal, state and local income tax calculation for 2026. Deterministic, source-attributed responses, no key required, 60 requests a minute.
- Provider
- EstimateTax
- Website
- estimatetax.net ↗
Details from estimatetax.net.
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EstimateTax API alternatives
apiKeyHTTPSCORS
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EstimateTax API FAQ
Who provides the EstimateTax API?
The EstimateTax API is provided by EstimateTax (estimatetax.net). A REST API for US federal, state and local income tax calculation for 2026. Deterministic, source-attributed responses, no key required, 60 requests a minute.
Is the EstimateTax API free?
Yes. The EstimateTax API is listed in the Finance category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Does the EstimateTax API require an API key?
No. The EstimateTax API requires no authentication, so you can start making requests without signing up.
Can I call the EstimateTax API from the browser?
Yes. The EstimateTax API supports CORS, so front-end JavaScript can call it directly.
Does the EstimateTax API support HTTPS?
Yes. The EstimateTax API is served over HTTPS, so it's safe to use in production.