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Protocol for the implementation of the provision of tax information to Local Entities adhered to the Agreement for the Exchange of Tax Information and Collaboration in Collections Management (PROTEELL - June 2021)

3.3.1. Description of this information provision route

Web services technology involves computer developments by the entity requesting information, for the implementation of the information obtaining system in its applications.

Once developed by the IT services, the authorized body will enter in its certificate request application the identifying data of the interested party from whom it wishes to obtain information, the purpose of the request and the type of certificate requested. Before sending the request to the web service of the issuing body, you must sign the request message. The signature of the request message will follow the XML-DSig protocol.

To send the request, a secure channel (SSL tunnel) will be established. The Tax Agency web services require client authentication when establishing this channel. To successfully establish this tunnel, it is necessary that the electronic certificate used for this purpose has been authorized by the AEAT.

Therefore, to send a request one or more electronic certificates will be used in two moments: for the signing of the petition and for the establishment of the secure channel. It is not necessary that these actions be carried out with the same certificate, but it is necessary that said situation be communicated to the AEAT, which will associate them with the requesting body.

Once the request message is generated and sent by the requesting body, the issuing body will verify that it is authorized to invoke the requested web service. Once this verification has been carried out, the issuing body will process the request, issuing an electronically signed response (document in XML format that contains all the related data) that will be sent to the requesting body synchronously.

For more information you can contact:

CAT – AEAT Call Center

  • Telephone: 901 200 349

  • E-mail: CATENTIDADES@CORREO.AEAT.ES

The technical specifications for making requests for information on bank deposits and investment funds through web services can be consulted in Index of information provision web services New window . These requests are answered immediately.