How to Use the Presumed Profit Tax Calculator MCP in Claude

Calculate Brazilian presumed profit taxes right from your Claude Desktop chat, no spreadsheets needed.

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Connect Presumed Profit Tax Calculator MCP to Claude Desktop

Create your Vinkius account to connect Presumed Profit 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 Presumed Profit Tax Calculator with Claude Desktop

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Figure Out Your Tax Base

This MCP calculates your taxable base for Brazilian Presumed Profit taxes. Just give your AI client your gross revenue and activity type, and the `get_taxable_base` tool figures out the correct amount based on standard presumptive margins. It's the first step for any tax calculation. The tool uses the standard 32% margin for services and 8% for commerce. It's designed to give you a quick, reliable number without you needing to look up the rules yourself.

Calculate CIT and SCLL with Claude Desktop

Once you have the base, you can calculate the specific tax liabilities. The `calculate_cit_breakdown` tool computes the Corporate Income Tax, including the 15% standard rate and the 10% surtax where it applies. You can also get your Social Contribution liability using the `calculate_scll_liability` tool, which applies the flat 9% rate. Your agent can run these one by one or all at once.

Get a Full Tax Report Instantly

Don't piece things together manually. The `generate_tax_summary_report` tool pulls all the calculations into a single, consolidated report. It shows the taxable base, CIT, SCLL, and the total tax due. Ask your AI client for the report and you'll get a clean summary you can copy and paste anywhere. This is perfect for quick checks or preparing your monthly tax filings.

Setup guide

Set up Presumed Profit 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 Presumed Profit 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 Presumed Profit 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 presumed-profit-tax-calculator-mcp.

json

{
  "mcpServers": {
    "presumed-profit-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 Presumed Profit Tax 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 Presumed Profit Tax Calculator MCP in Claude Desktop

Add this MCP from the Vinkius catalog to your Claude Desktop app. Once connected, you can just ask your agent to calculate taxes. For example, 'Calculate the tax summary for a service company with R$100,000 in revenue.'

It's built for businesses under Brazil's Presumed Profit (Lucro Presumido) regime. This MCP uses standard margins for commerce (8%) and services (32%). It doesn't handle custom margins for specific sectors yet.

CIT (Corporate Income Tax) and SCLL (Social Contribution on Net Profit) are two separate federal taxes in Brazil. This MCP calculates both for you, so you see the full picture of your liability.

Yes. You can connect this MCP Server to claude.ai by pasting its URL into the Custom Connectors section in your settings. Your agent will have the same tax calculation tools available.

Yes. Your gross revenue and activity type are sent to the MCP for calculation and immediately discarded. Vinkius uses industry-standard encryption for all data in transit, and no financial inputs are ever stored.

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