Published on Thu Jun 25 2026 00:00:00 GMT+0000 (Coordinated Universal Time) by Miguel Gonzalez Herrera

Querying Spanish tax administrative doctrine — whether from the TEAC, the regional Economic-Administrative Tribunals, or the DGT — means navigating multiple official search engines with complex interfaces. In this guide you will learn how to connect the Apify MCP to Claude so that the assistant itself searches and analyses the doctrine for you, all from a simple conversation.

🏛️ What Sources Does the legaltech/hacienda Actor Cover?

The legaltech/hacienda actor automates searches across three official sources of Spanish tax administrative doctrine from the Ministry of Finance:

• DYCTEA — binding and non-binding criteria from the TEAC and the regional TEAR tribunals. Covers the central TEAC and all Regional Economic-Administrative Tribunals.
• DGT — Binding Rulings from the Directorate General of Taxes. Only binding rulings (V-XXXX-YY).
• TEAC Histórica — the classic search engine with historical resolutions classified by tax concept and Vocalía.

🤖 Tutorial: Connect Apify to Claude and Start Querying

Thanks to the Model Context Protocol (MCP), Claude can connect to external tools such as Apify. This means that, instead of navigating the official Hacienda search engines, you can ask Claude in natural language to retrieve the doctrine you need and work with it.

Step 1: Create an Apify Account and Get Your Token

The first thing you need is an Apify account. The free plan provides enough monthly usage credits to run the actor.

Once inside, go to Settings → API & Integrations, click Create new token, and copy it.

Step 2: Download Claude Desktop

Download and install the Claude Desktop app from claude.com/download. This desktop version is the one that allows you to add external MCP connectors.

Step 3: Install the Apify Connector and Paste Your Token

Open Claude Desktop, go to the connector settings, and select Add custom connector. Enter the Apify MCP URL and paste the token you copied in the previous step.

https://mcp.apify.com/?tools=actors,docs,runs,storage,tasks,legaltech/cendoj,legaltech/hacienda,legaltech/tribunal-constitucional,legaltech/tjue,legaltech/fiscalia,legaltech/catastro,legaltech/ine,legaltech/aepd

With this you now have access to all LegalTech actors from Claude: legaltech/hacienda, legaltech/cendoj, legaltech/tribunal-constitucional, and many more.

📱 Bonus: Once the connector is set up in your account, you can also use it from the Claude mobile app. The connector is linked to your account, so you can query Hacienda doctrine from any device without any additional configuration.

Step 4: Query Administrative Doctrine from the Chat

Once the connector is configured, open the Claude chat and verify that Apify appears as an available tool.

Now you can ask Claude in natural language to find the doctrine you need. For example:

Use the legaltech/hacienda actor and find DGT binding rulings on the taxation of cryptocurrencies under personal income tax

Use the legaltech/hacienda actor and give me the latest TEAC resolutions on the deductibility of financial expenses

Use the legaltech/hacienda actor and search DYCTEA for criteria on the tax liability of company directors

Claude will run the actor with the criteria you specified, automatically selecting the most appropriate source (DYCTEA, DGT, or TEAC Histórica), and return the results ready for analysis.

Step 5: Analyse the Doctrine from the Chat

Once Claude has the results, you can keep working with them without leaving the conversation. Beyond answering questions, Claude can generate conceptual graphs that connect tax resolutions with each other and link them to related case law, letting you visualise the evolution of a criterion and the relationships between sources at a glance.

Some examples of what you can ask:

• Summarise the criterion of each binding ruling in two sentences.
• Has the DGT’s position on this matter changed in the last three years?
• Identify which of these TEAC resolutions are binding in administrative proceedings.
• Generate a table with the reference, date, and main criterion of each resolution.
• What recurring arguments do the tribunals use in these cases?

The analysis is a conversation: you refine your questions and Claude responds drawing on the doctrine it retrieved directly from the official Hacienda sources.

Written by Miguel Gonzalez Herrera