Is the Free Salary + Capital Gains Tax Calculator API (ITR-3) 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/combined-tax?

Endpoints are cached at the edge for 24 hours. There are no restrictive rate limits for standard web traffic and mobile applications.

Taxation & Salary APIWeb Calculator UI

Free Salary + Capital Gains Tax Calculator API (ITR-3) (2026)

API for multi-income taxpayers combining salary income with stock/crypto capital gains.

Interactive API Playground & Live Test

GET/api/v1/combined-tax

Zero Auth • Open CORS

Query Parameters

salaryIncomenumber • required

Gross annual salary in ₹

stcgEquitynumber • optional

STCG equity gains in ₹

ltcgEquitynumber • optional

LTCG equity gains in ₹

curl -X GET "https://fincalculator.in/api/v1/combined-tax?salaryIncome=1800000&stcgEquity=150000&ltcgEquity=300000" \
  -H "Accept: application/json"

Live JSON Response (HTTP 200 OK)

Click "Execute Live API Request" below...

Request Parameters Schema

Parameter	Type	Required	Description / Notes
salaryIncome	number	Required	Gross annual salary in ₹
stcgEquity	number	Optional	STCG equity gains in ₹
ltcgEquity	number	Optional	LTCG equity gains in ₹

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