Business & SME APIWeb Calculator UI
Free GST Input Tax Credit (ITC) Calculator API (2026)
API for small businesses, CA portals, and invoicing software to calculate net GST liability and ITC carryforward.
Interactive API Playground & Live Test
GET
/api/v1/gst-itcQuery Parameters
Sales amount excl. GST in ₹
Sales GST rate % (0, 5, 12, 18, 28)
Purchases amount excl. GST in ₹
Purchases GST rate %
Set "true" for IGST, "false" for CGST+SGST
curl -X GET "https://fincalculator.in/api/v1/gst-itc?sales=1000000&salesRate=18&purchases=600000&purchasesRate=18&interstate=false" \
-H "Accept: application/json"Live JSON Response (HTTP 200 OK)
Click "Execute Live API Request" below...Request Parameters Schema
| Parameter | Type | Required | Description / Notes |
|---|---|---|---|
| sales | number | Required | Sales amount excl. GST in ₹ |
| salesRate | number | Required | Sales GST rate % (0, 5, 12, 18, 28) |
| purchases | number | Required | Purchases amount excl. GST in ₹ |
| purchasesRate | number | Required | Purchases GST rate % |
| interstate | boolean | Optional | Set "true" for IGST, "false" for CGST+SGST |