Taxation & Salary APIWeb Calculator UI
Free Income Tax Calculator API India (FY 2026-27) (2026)
Official income tax calculation API for Indian salary and business tax returns under Gazette tax slabs.
Interactive API Playground & Live Test
GET
/api/v1/income-taxQuery Parameters
Gross annual income in ₹; the standard deduction is subtracted for you
new | old | new-2025-26 | new-2024-25 (default: new, the FY 2026-27 slabs)
Set "false" when income is not salary or pension (default: true)
curl -X GET "https://fincalculator.in/api/v1/income-tax?income=1500000®ime=new&applyStandardDeduction=true" \
-H "Accept: application/json"Live JSON Response (HTTP 200 OK)
Click "Execute Live API Request" below...Request Parameters Schema
| Parameter | Type | Required | Description / Notes |
|---|---|---|---|
| income | number | Required | Gross annual income in ₹; the standard deduction is subtracted for you |
| regime | string | Optional | new | old | new-2025-26 | new-2024-25 (default: new, the FY 2026-27 slabs) |
| applyStandardDeduction | boolean | Optional | Set "false" when income is not salary or pension (default: true) |
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Frequently Asked Questions (FAQs)
Is the Free Income Tax Calculator API India (FY 2026-27) 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.