How to Use the ISS Calculator MCP in Cursor

Q: How do I configure the ISS Calculator for my project in Cursor?

Create a .cursor/mcp.json file in your project's root directory and add the ISS Calculator MCP configuration. This makes the tools available to your agent for that specific project.

Inject live Brazilian service tax (ISS) data and calculations directly into your code with Cursor's AI agent.

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Connect ISS Calculator MCP to Cursor

Create your Vinkius account to connect ISS Calculator to Cursor — we handle the hosting, security, and runtime updates so you don't have to. No server setup required.

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Setup ISS Calculator with Cursor

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Code with Live Tax Rates

Stop hardcoding tax rates or using stale data. Tell your Cursor agent to fetch a Brazilian service tax rate using `get_applicable_rate`, and it will write the code with the live percentage for that specific municipality. You can build functions that are always accurate. This MCP gives your agent the context it needs to generate correct, location-aware financial code from the start.

Generate Withholding Logic

Tax withholding rules are tricky. Have your agent `check_withholding_status` to determine if ISS needs to be retained for a service. It returns a boolean you can use directly in your code. This removes the guesswork from building compliant payment and invoicing systems. Your agent can generate the correct if/else block based on the tool's live response, right in your editor.

Build Accurate Tax Calculators

Let the agent build your calculation logic. When you ask it to figure out the final tax amount, it can call the `calculate_tax_liability` tool. This is way better than writing the math from scratch. Just add this MCP to your project's `mcp.json` file. Your agent immediately gets these financial tools, turning it into a specialist for Brazilian tax code.

Setup guide

Set up ISS Calculator MCP in Cursor

Prerequisites

Cursor installed (macOS, Windows, or Linux)
Active Vinkius subscription with a valid endpoint token

1

Open MCP Settings

Go to Cursor Settings → MCP or open the Command Palette (Cmd+Shift+P / Ctrl+Shift+P) and search for "MCP: Add Server".
2

Add the ISS Calculator MCP

Cursor will create or open .cursor/mcp.json in your project root. Paste the JSON snippet on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Enable Agent mode

Open Composer (Cmd+I / Ctrl+I) and switch to Agent mode using the dropdown at the top. MCP tools are only available in Agent mode.
4

Verify the connection

Ask Cursor something like "List my recent ISS Calculator transactions." If the MCP tools are loaded correctly, Cursor will call the ISS Calculator tools automatically. You can also check Settings → MCP for a green status indicator.

.cursor/mcp.json

{
  "mcpServers": {
    "iss-calculator-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by ISS Calculator. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about ISS Calculator MCP in Cursor

You enable Agent mode and ask it to perform a task, like 'write a function to get the ISS tax for São Paulo'. Cursor uses the ISS Calculator MCP to get real data and injects it into the code it generates for you.

Yes, that's a perfect use case. The ISS Calculator gives your agent the tools to generate code for fetching rates, checking withholding rules, and calculating final tax amounts for any Brazilian municipality.

Create a `.cursor/mcp.json` file in your project's root directory and add the ISS Calculator MCP configuration. This makes the tools available to your agent for that specific project.

Yes. The tools provide data to the Cursor agent, which then generates code in whatever language you're working with, whether it's Python, TypeScript, Go, or something else.

Your requests, containing things like city names and service types, are sent to the Vinkius-managed MCP over a secure, encrypted connection. The data is used only to get your answer and is not logged or stored.

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