# Melso

Melso es la API unificada de la burocracia española: Hacienda (AEAT), Seguridad Social, SEPE, Verifactu, TicketBAI y constituir una SL. La app y el MCP cubren facturación, contabilidad y el cálculo de impuestos. Presentar y las gestiones las hacen profesionales de Melso tras la aprobación en la app. El REST de socio es beta privada. Escríbenos a hello@melso.ai.

Melso is the unified API for Spanish bureaucracy: Hacienda (AEAT), Social Security, SEPE, Verifactu, TicketBAI and forming an S.L. The app and MCP cover invoicing, bookkeeping and tax calculation. Filing and company procedures are done by Melso professionals after in-app approval. Partner REST is a private beta. Write to hello@melso.ai.

> Melso is a gestoría, an accounting and tax service for self-employed people in Spain, with an AI agent, tax software and human professionals. Melso and its professionals prepare and file included returns after you approve them in the app.

The tax service is available to the self-employed in Spain according to their activity and tax profile.

Pro: €49 per month or €490 per year (equivalent to €40.83 per month).

Organising invoices and expenses and identifying missing information. Tax questions on WhatsApp and review and approval in the app. Professional preparation, review and filing of the included returns for your activity and tax profile. Annual income tax return (Renta, form 100) in Pro and Plus. Other annual and information returns and payroll are excluded unless confirmed in writing. Hacienda’s requests about the returns we file are included. Covered forms and tax regimes depend on your case. A calendar reminder does not mean a service is included. Invoices and expenses are unlimited. The agent’s AI usage has a shared monthly limit.

The professional prepares and reviews. You approve the exact version in the app. Melso handles filing, confirmed by the actual AEAT receipt.

Your assistant can draft invoices through MCP and issue them where your account and server-side prerequisites allow. Issuance requires the owner to authorize the exact saved version through their own OAuth connection, a plan with tools and verified issuer authorization. A draft request does not authorize issuance. You can also review and issue in the Melso app; tax returns and cases require approval in the app. Melso and its professionals review and file your included returns with Spain’s tax agency, the AEAT, after your approval. An MCP client cannot approve, file or pay your taxes.

From the records of the company you choose when authorising the connection: expenses, invoices and returns stored in Melso. Each connection works in one company. The server checks access on every call; a different company needs a separate connection.

The fiscal server https://mcp.melso.ai/mcp connects to the authorized company's records through OAuth. https://docs.melso.ai/mcp searches documentation; it is not the server for your tax records.

Facts reviewed: 2026-10-20. Source revision: 28f7c6c0c1e469af4a399268038d015ee218545b. Languages: Spanish, English and Catalan. Scope: the public service for self-employed people in Spain.

## Start here

- [What Melso is](https://melso.ai/en/about.md)
- [Prices and included scope](https://melso.ai/en/pricing.md)
- [Common questions](https://melso.ai/en/about.md#frequently-asked-questions)

## Connect your AI

- [Spain bureaucracy API](https://melso.ai/en/api.md)
- [API overview](https://docs.melso.ai/api/overview)
- [API availability](https://docs.melso.ai/api/availability)
- [MCP server](https://mcp.melso.ai/mcp)
- [Melso MCP](https://melso.ai/en/mcp.md)
- [Add to Claude](https://claude.ai/customize/connectors?modal=add-custom-connector&connectorName=Melso&connectorUrl=https%3A%2F%2Fmcp.melso.ai%2Fmcp)
- [All client setup guides (English)](https://docs.melso.ai/mcp/connect)

## Services and fiscal guidance

- [Quarterly VAT: form 303](https://melso.ai/en/tramites/modelo-303.md)
- [Income tax prepayments: form 130](https://melso.ai/en/tramites/modelo-130.md)
- [Annual income tax: Renta, form 100](https://melso.ai/en/tramites/modelo-100.md)

## Languages

- [Español](https://melso.ai/es/llms.txt)
- [English](https://melso.ai/en/llms.txt)
- [Català](https://melso.ai/ca/llms.txt)

## Blog

- [Complete published blog index](https://melso.ai/en/blog/index.md)

## Optional

- [Complete text](https://melso.ai/llms-full.txt)
- [Technical docs (English)](https://docs.melso.ai/llms.txt)
- [Brand guide (English)](https://melso.ai/brand.md)