How to Use the ISS Calculator MCP in Claude Code

Use Claude Code to pipe ISS Calculator tax data directly into your terminal workflows.

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Connect ISS Calculator MCP to Claude Code

Create your Vinkius account to connect ISS Calculator to Claude Code — 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 Claude Code

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Terminal-based tax calculation

You execute `calculate_tax_liability` via the command line to get instant tax figures for your scripts. This fits perfectly into your existing terminal processes. Claude Code pipes the output directly to your next command. You build automated tax workflows without ever leaving the terminal.

Verify withholding in shell scripts

Use `check_withholding_status` to determine tax requirements within your CI/CD pipelines. This ensures every deployment meets local tax regulations. It acts as a gatekeeper for your financial logic. Your pipelines stop automatically if the tax status check fails.

Extract rates via CLI

You run `get_applicable_rate` to pull current municipal rates into your environment variables. Claude Code manages these lookups for your backend services. This keeps your infrastructure updated with the latest tax data. You avoid hardcoding values that change every quarter.

Setup guide

Set up ISS Calculator MCP in Claude Code

Prerequisites

Claude Code CLI installed (npm install -g @anthropic-ai/claude-code)
Active Vinkius subscription with a valid endpoint token

1

Run the add command

Open your terminal and run the command shown on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com. Use --scope user to make it available across all projects.
2

Verify the connection

Start a Claude Code session and type /mcp to list connected servers. You should see iss-calculator-mcp with a green status indicator.
3

Start using tools

Ask Claude Code something like "Check my latest ISS Calculator transactions." It will automatically discover and invoke the available ISS Calculator tools.

Terminal

claude mcp add --transport http iss-calculator-mcp https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

Get your connection token →

Prerequisites

Claude Code CLI installed
Active Vinkius subscription with a valid endpoint token

1

Open the config file

Create or edit .mcp.json in your project root for project-level scope, or ~/.claude.json for user-level scope.
2

Add the ISS Calculator MCP

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

Restart Claude Code

Start a new Claude Code session. Type /mcp to confirm the server is connected. The tools will be automatically available in your conversation.

.mcp.json

{
  "mcpServers": {
    "iss-calculator-mcp": {
      "type": "url",
      "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 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.