Taxation & Salary APIWeb Calculator UI
Free ESOP & Startup Equity Tax Calculator API (2026)
API for calculating perquisite tax at exercise (FMV − Strike Price) and capital gains tax at share sale.
Interactive API Playground & Live Test
GET
/api/v1/esopQuery Parameters
Number of ESOP shares
Exercise strike price in ₹
Fair Market Value at exercise in ₹
Sale price per share in ₹
curl -X GET "https://fincalculator.in/api/v1/esop?sharesCount=1000&strikePrice=100&exerciseFmv=500&salePrice=1200" \
-H "Accept: application/json"Live JSON Response (HTTP 200 OK)
Click "Execute Live API Request" below...Request Parameters Schema
| Parameter | Type | Required | Description / Notes |
|---|---|---|---|
| sharesCount | number | Required | Number of ESOP shares |
| strikePrice | number | Required | Exercise strike price in ₹ |
| exerciseFmv | number | Required | Fair Market Value at exercise in ₹ |
| salePrice | number | Required | Sale price per share in ₹ |