e-rechnung-mcp

MCP server for German e-invoicing. Two tools, fully local — no network calls, no accounts:

• generate_xrechnung — create a valid XRechnung (EN 16931, CII XML) from structured input. Supports German VAT rates (19/7), § 19 UStG small businesses (Kleinunternehmer) and Leitweg-ID for B2G invoices. Input is validated (§ 14 UStG mandatory fields) before generation.

• validate_einvoice — check an XRechnung / ZUGFeRD CII XML: mandatory fields, EN 16931 basics and total calculations. Findings are returned in plain German.

The invoice core is the same one that powers e-rechnungsbuch.de and is tested against the official KoSIT/Mustang validator.

Usage

Claude Desktop / Claude Code / any MCP client (stdio):

{
  "mcpServers": {
    "e-rechnung": {
      "command": "npx",
      "args": ["-y", "e-rechnung-mcp"]
    }
  }
}

Example prompts once connected:

• "Erstelle eine XRechnung: Rechnung RE-2026-042 von Testfirma GmbH an Kunde AG, 2 Stunden Beratung je 150 Euro, 19 % USt."

• "Validate this e-invoice XML and explain the findings." (paste XML)

Related MCP server: einvoice-mcp

Notes

• Dates are ISO (YYYY-MM-DD); amounts are net EUR with max 2 decimals.

• For Kleinunternehmer set kleinunternehmer: true — the invoice carries the § 19 UStG exemption note instead of VAT.

• Validation covers CII syntax (XRechnung and the XML part of ZUGFeRD); it complements but does not replace the official KoSIT schema validation.

License

MIT