Conversor IAE-CNAE — MCP for Spanish tax data

What is Conversor IAE-CNAE — MCP for Spanish tax data?

The first fiscal MCP server for Spain. It gives any AI agent a direct line to live IAE codes (1,187), CNAE 2025 codes (1,060), AEAT tax-form obligations, the IAE↔CNAE crosswalk, módulos IRPF/IVA, and 2026 RETA brackets — all from official Spanish sources (AEAT, INE, BOE). Designed for autónomos and gestorías who need accurate, non-hallucinated tax data.

How to use Conversor IAE-CNAE — MCP for Spanish tax data?

No installation required; the server is hosted at conversoriaecnae.es. Connect any MCP-compatible client (Claude Desktop, ChatGPT, Cursor, Gemini CLI) by adding the Streamable HTTP endpoint: https://www.conversoriaecnae.es/api/mcp/mcp. For the 4 premium tools, add a cvr_ API key as a Bearer header. No registration needed for the 6 free tools.

Key features of Conversor IAE-CNAE — MCP for Spanish tax data.

• 10 tools total: 6 free, 4 premium.
• Semantic search across IAE and CNAE descriptions.
• Full IAE ↔ CNAE 2025 crosswalk lookups.
• Fiscal calendar with AEAT forms and deadlines.
• Premium: applicable AEAT obligations with confidence and frequency.
• Premium: módulos IRPF/IVA and 2026 RETA quota by net income.

Use cases of Conversor IAE-CNAE — MCP for Spanish tax data.

• Mapping IAE codes to their corresponding CNAE 2025 codes for tax filings.
• Retrieving the complete fiscal calendar (modelos 036/130/303/347 etc.) for a given activity.
• Bulk-lookup of up to 50 IAE or CNAE records for client portfolio management.
• Determining the applicable módulos (estimación objetiva) for an IAE activity.
• Computing the 2026 RETA minimum quota from a self-employed person’s net income.

FAQ from Conversor IAE-CNAE — MCP for Spanish tax data.

Which tools are free and which require payment?

Six tools are free with no key or signup: buscar_codigo, detalle_iae, detalle_cnae, detalle_cnae_2009, calendario_fiscal, and describe_conversor. Four premium tools (obligaciones_fiscales, modulos_irpf_iva, consulta_masiva, cuota_reta) require a Profesional plan (from €29/mo) with a cvr_ API key.

How do I connect to the server?

Add the server to your MCP client config as a Streamable HTTP endpoint at https://www.conversoriaecnae.es/api/mcp/mcp. For premium tools, include an Authorization: Bearer cvr_your_api_key header.

Where does the data come from?

All data is sourced from official Spanish institutions: AEAT (Agencia Tributaria) for IAE codes and fiscal models, INE (Instituto Nacional de Estadística) for CNAE 2025, and BOE for underlying regulation. Each response includes a freshness signal.

Does the server require self-hosting or installation?

No. The server is hosted at conversoriaecnae.es; there is nothing to install or self-host. The GitHub repository contains only the manifest, documentation, and examples.

What transport protocol does the server use?

It uses Streamable HTTP (MCP specification 2025-11-25). SSE is not exposed.