# calculate_gst_tax

Calculates GST (CGST, SGST, IGST) breakdown based on transaction amount, GST rate, seller's GSTIN and buyer's location/state. Determines inter-state vs intra-state routing automatically.

Agent View of the PolicyLayer registry record for `calculate_gst_tax`. HTML page: https://policylayer.com/tools/denispaul-india-business-mcp-server/calculate-gst-tax

## Facts

- Tool: `calculate_gst_tax`
- Server: India Business (`@denispaul/india-business-mcp-server`) — https://policylayer.com/tools/denispaul-india-business-mcp-server.md
- Install: `npx -y @denispaul/india-business-mcp-server`
- Homepage: https://www.npmjs.com/package/@denispaul/india-business-mcp-server
- Risk category: Read (Low risk)
- Registry record: grade A, identity unverified
- Server rate-limited: no
- Parameters: 5 (4 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `rate` | number | yes | The GST tax rate percentage (e.g. 5, 12, 18, 28). |
| `amount` | number | yes | The transaction amount (price of goods/services). |
| `inclusive` | boolean | no | Whether the provided amount is inclusive of GST. Defaults to false (exclusive). |
| `sellerGstin` | string | yes | The 15-character GSTIN of the seller. |
| `buyerStateCodeOrName` | string | yes | The state name or 2-digit state code of the buyer (e.g., 'Delhi' or '07'). |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "calculate_gst_tax",
    "arguments": {
      "rate": 0,
      "amount": 0,
      "sellerGstin": "<sellerGstin>",
      "buyerStateCodeOrName": "<buyerStateCodeOrName>"
    }
  }
}
```

## Why calculate_gst_tax is rated Low

This tool takes input parameters (transaction amount, GST rate, GSTIN, location) and returns calculated GST tax breakdown figures. It is a read-only, deterministic calculation with no side effects, data modification, execution of code, or financial transaction processing.

From the tool's own definition: "Tool 'calculate_gst_tax' performs a calculation that 'Calculates GST breakdown based on transaction amount, GST rate, seller's GSTIN and buyer's location/state.' The operation is computational and returns information derived from input parameters without…"

## Use case

AI agents call calculate_gst_tax to retrieve information from India Business without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches India Business:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "calculate_gst_tax": {}
  }
}
```

## Other tools on India Business (5)

- `check_pincode_serviceability` — Read — https://policylayer.com/tools/denispaul-india-business-mcp-server/check-pincode-serviceability.md
- `lookup_ifsc` — Read — https://policylayer.com/tools/denispaul-india-business-mcp-server/lookup-ifsc.md
- `lookup_pincode` — Read — https://policylayer.com/tools/denispaul-india-business-mcp-server/lookup-pincode.md
- `validate_gstin` — Read — https://policylayer.com/tools/denispaul-india-business-mcp-server/validate-gstin.md
- `validate_pan` — Read — https://policylayer.com/tools/denispaul-india-business-mcp-server/validate-pan.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=denispaul-india-business-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/denispaul-india-business-mcp-server