FinCalculator
Taxation & Salary APIWeb Calculator UI

Free Old vs New Income Tax Regime Comparison API (2026)

API comparing Old Tax Regime (with 80C, 80D, HRA deductions) against New Tax Regime.

Interactive API Playground & Live Test

GET/api/v1/income-tax

Query Parameters

Gross annual income in ₹

curl -X GET "https://fincalculator.in/api/v1/income-tax?income=1500000" \
  -H "Accept: application/json"
Live JSON Response (HTTP 200 OK)
Click "Execute Live API Request" below...

Request Parameters Schema

ParameterTypeRequiredDescription / Notes
incomenumberRequiredGross annual income in ₹

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Frequently Asked Questions (FAQs)

Is the Free Old vs New Income Tax Regime Comparison API free to use in production apps?
Yes! All FinCalculator REST APIs are completely free, zero-auth, open-CORS, and edge-cached for high performance across global web and mobile applications.
What is the rate limit for /api/v1/income-tax?
Endpoints are cached at the edge for 24 hours. There are no restrictive rate limits for standard web traffic and mobile applications.