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-taxQuery Parameters
Gross annual salary in ₹ (default: 12,00,000)
STCG equity gains in ₹ (default: 0)
LTCG equity gains in ₹ (default: 0)
curl -X GET "https://fincalculator.in/api/v1/combined-tax?salaryIncome=1200000&stcgEquity=0<cgEquity=0" \
-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 | Optional | Gross annual salary in ₹ (default: 12,00,000) |
| stcgEquity | number | Optional | STCG equity gains in ₹ (default: 0) |
| ltcgEquity | number | Optional | LTCG equity gains in ₹ (default: 0) |
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Frequently Asked Questions (FAQs)
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.