EstimateTax
FreemiumLiveLast verified 24 Sept 2026
Calculates US federal, state and local income tax, citing a source document and date for every figure.
Example request
curl -s 'https://estimatetax.net/api/v1/calculate?income=75000&filingStatus=single&state=CA'
Free tier, in plain English
Free and keyless up to 60 requests a minute per address; a separate business page covers higher-volume or contractual use.
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