NL Tax Calculator MCP

An official MCP server for NL Tax Calculator that allows AI assistants to perform accurate Dutch tax calculations using the site's proprietary logic and 2026 rates. It supports net salary estimation, Box 3 wealth tax, highly skilled migrant salary checks, severance calculations, transfer tax, US-Dutch tax comparisons, full income return estimates, ZZP freelancer taxes, mortgage affordability, and benefit eligibility.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-18Operated by NL Tax Calculator

MCP endpoint (Streamable HTTP)

https://nltaxcalculator.nl/dutch-tax/api/mcp

Vendor documentation

What you can do with it

Calculate net salary with 30% ruling
Estimate Dutch Box 3 wealth tax
Check highly skilled migrant salary requirements
Estimate ZZP freelancer income tax

Tools advertised by the last live check:

net_salary_netherlands
box3_wealth_tax
visa_salary_check
job_loss_planner
dutch_tax_changes_2027
transfer_tax_netherlands
us_tax_for_americans_in_netherlands
income_tax_return_netherlands
freelancer_tax_netherlands
mortgage_netherlands
benefits_toeslagen_check
box3_actual_return_estimate
gross_salary_for_target_net

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http nl-tax-calculator-mcp https://nltaxcalculator.nl/dutch-tax/api/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add nl-tax-calculator-mcp --url https://nltaxcalculator.nl/dutch-tax/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable nl-tax-calculator-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "nl-tax-calculator-mcp": {
      "url": "https://nltaxcalculator.nl/dutch-tax/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "nl-tax-calculator-mcp": {
      "type": "streamableHttp",
      "url": "https://nltaxcalculator.nl/dutch-tax/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start nl-tax-calculator-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "nl-tax-calculator-mcp": {
      "type": "http",
      "url": "https://nltaxcalculator.nl/dutch-tax/api/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http nl-tax-calculator-mcp https://nltaxcalculator.nl/dutch-tax/api/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "nl-tax-calculator-mcp": {
      "url": "https://nltaxcalculator.nl/dutch-tax/api/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "nl-tax-calculator-mcp": {
      "serverUrl": "https://nltaxcalculator.nl/dutch-tax/api/mcp"
    }
  }
}

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