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Indian Tax APIPre-release · Early accessFree · Open source

India GST-ready REST APIs for Dynamics 365 Business Central

The missing India GST API layer for Business Central, built once, properly. GST-aware REST/OData endpoints for master data and documents, and AI/MCP tools for Copilot and other assistants — with GST computed by Business Central itself.

Works with Business Central 28 or later with Microsoft's India localization (India Tax Base + India GST). Published by SS Dynamics Solutions Pvt. Ltd.

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The problem

Standard Business Central APIs know nothing about India GST

Microsoft's standard APIs (/api/v2.0/) are a global contract. They do not carry GSTIN, GST groups, HSN/SAC codes, place of supply, reverse charge or e-invoice IRN — and they cannot be extended. Microsoft's India GST localization ships no API objects of its own.

So every Indian business integrating Business Central with an e-commerce store, marketplace, e-invoicing provider, logistics system or POS ends up rebuilding the same API layer from scratch.

The answer

Indian Tax API is that missing layer

A set of REST/OData endpoints under

/api/ssd/indiantax/v1.0/

with India GST fields as first-class, writable fields. GST is calculated by the standard localization inside Business Central — never reimplemented — so what the API returns is exactly what the client shows.

What it provides

GST-aware endpoints across the full document lifecycle

1
Read + write

Master Data

Create and maintain GST-aware master records without touching the Business Central client.

  • Customers and Vendors with GSTIN, GST registration type and state
  • Items with HSN/SAC codes and GST groups
  • Locations with GST registration numbers
  • Default Dimensions
  • Indian States (read-only lookup)
2
Read + write

Documents

Headers and lines in one call, with GST computed by Business Central exactly as it is in the client.

  • Sales Orders and Sales Invoices
  • Purchase Orders and Purchase Invoices
  • Place of supply, reverse charge and GST group per line
  • Expand header + lines in a single request
  • GST amounts calculated by the standard India localization
3
Bound actions

Document Actions

Drive the document lifecycle from your integration or AI agent, with the same validations as the client.

  • Release
  • Ship & Invoice
  • Receive & Invoice
  • Post
4
Read-only

Posted Documents

Everything downstream systems need from a posted invoice, including e-invoicing details.

  • Posted Sales Invoices with lines
  • Posted Purchase Invoices with lines
  • GST amounts per line and per document
  • E-invoice IRN and acknowledgement details
  • Reverse-charge flags and bill of entry
AI-ready (MCP)

Let AI assistants query your tenant with correct GST context

Business Central 28+ includes a built-in MCP server that turns API pages into tools for AI assistants such as Copilot, Claude and ChatGPT-style agents. Because these endpoints are purpose-built API objects, they can be added to an MCP configuration so an assistant works directly against the live tenant — no extra infrastructure.

Example question

“What did we invoice to Maharashtra customers this month?”

Answered from posted sales invoices with GST amounts and place of supply — straight from Business Central.

Who it is for

  • Indian businesses on Business Central that integrate with e-commerce stores, marketplaces, e-invoicing providers, logistics systems or POS
  • ISVs and integration partners building connectors that must carry correct GST data
  • Partners who want to expose Business Central data to AI assistants with the right GST context

Key benefits

  • Stop rebuilding GST-aware APIs for every project
  • Same behaviour as the Business Central client — GST is calculated by the standard localization, not reimplemented
  • Standard OData: filtering, $expand (header + lines in one call) and Business Central’s normal OAuth security
  • Purpose-built API pages that plug straight into the Business Central MCP server
  • Free of charge, open source and developed in public

Building an integration for Business Central in India?

Indian Tax API is in early access and being built in the open. Talk to us about your use case, get onboarded early and help shape the endpoints.

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