How to Use the PIS/COFINS Tax Calculator MCP in Claude

Calculate Brazilian tax liabilities directly inside Claude Desktop without leaving your workspace.

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Connect PIS/COFINS Tax Calculator MCP to Claude Desktop

Create your Vinkius account to connect PIS/COFINS Tax Calculator to Claude Desktop — we handle the hosting, security, and runtime updates so you don't have to. No server setup required.

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Setup PIS/COFINS Tax Calculator with Claude Desktop

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Run tax math in Claude Desktop

Stop jumping between your browser and spreadsheets to figure out your tax burden. You can invoke `calculate_cumulative_tax` to handle your specific monthly liabilities. This MCP brings the math directly into your chat, keeping your financial logic right where you discuss your business strategy.

Handle non-cumulative regimes

If your operation falls under the non-cumulative rules, `calculate_non_cumulative_tax` provides the exact figures you need. It processes your input and returns the net liability instantly. Claude Desktop displays these results in the chat window, so you have a clear record of the calculation for your reports.

Decide between tax structures

Use `evaluate_regime_comparison` to see how your tax bill changes depending on the regime you choose. This saves you from running manual comparisons for every scenario. It gives you the data you need to make an informed decision within your Claude Desktop sessions.

Setup guide

Set up PIS/COFINS Tax Calculator MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The PIS/COFINS Tax Calculator MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the PIS/COFINS Tax Calculator MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under piscofins-tax-calculator-mcp.

json

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

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by PIS/COFINS 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 PIS/COFINS Tax Calculator MCP in Claude Desktop

Add the configuration to your Claude Desktop settings file to activate the tools. Once saved, the hammer icon appears in the chat, allowing you to run tax calculations as needed.

Yes, it can. Simply ask your agent to compare the cumulative and non-cumulative regimes using the provided tool, and it will output the findings directly in your conversation.

It relies on standardized logic to compute your tax liabilities. You get consistent results every time you run a query.

The tools accept your specific financial inputs to produce accurate liability figures. You define the variables and the agent calculates the outcome.

Your tax figures remain within the local execution context of the MCP. No financial records are stored by the platform, ensuring your sensitive business data stays private.

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