Freelax Tax Engine MCP MCP server

This MCP server exposes Freelax's deterministic Czech tax engine, providing 14 read-only tools for OSVC tax computation, flat-tax eligibility, filing deadlines, and identified-person checks. It allows AI agents to retrieve accurate tax figures, insurance minimums, and deadlines with source verification, supporting both Claude and ChatGPT integrations without requiring authentication for public tools.

Endpoint and access

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

No sign-inEndpoint checked 2026-10-05Operated by Freelax

MCP endpoint (Streamable HTTP)

https://freelax.cz/api/mcp

Vendor documentation

What you can do with it

Compute full-year OSVC tax with credits and insurance minimums
Check flat-tax eligibility, bands, and year-end settlement
Retrieve filing deadlines for tax returns and insurance statements
Perform identified-person trigger check with 15-day registration deadline

Tools advertised by the last live check:

compute_year
calc_set_aside
compare_regimes
calc_flat_tax_settlement
estimate_penalty
convert_eur_czk
get_filing_deadlines
get_prehled_deadlines
czech_working_days
check_flat_tax_eligibility
get_flat_tax_band
check_thresholds
check_io_trigger
get_rule_source

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 freelax-tax-engine-mcp https://freelax.cz/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 freelax-tax-engine-mcp --url https://freelax.cz/api/mcp

Cursor

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

Cursor configuration

{
  "mcpServers": {
    "freelax-tax-engine-mcp": {
      "url": "https://freelax.cz/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": {
    "freelax-tax-engine-mcp": {
      "type": "streamableHttp",
      "url": "https://freelax.cz/api/mcp",
      "disabled": false
    }
  }
}

VS Code

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

VS Code configuration

{
  "servers": {
    "freelax-tax-engine-mcp": {
      "type": "http",
      "url": "https://freelax.cz/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 freelax-tax-engine-mcp https://freelax.cz/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": {
    "freelax-tax-engine-mcp": {
      "url": "https://freelax.cz/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": {
    "freelax-tax-engine-mcp": {
      "serverUrl": "https://freelax.cz/api/mcp"
    }
  }
}

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