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Change of electronic certificates on the current website and the new Tax Agency e-Office and review of the protocols accepted when connecting to the services offered to taxpayers.

WARNING: This change does not affect users of the current portal and the new Tax Agency headquarters, who will be able to continue accessing it as usual.

On 1 December 2021, the Tax Agency will change the electronic certificates used to provide services to taxpayers.This change aims to address the upcoming expiry of certificates and the need to bring the e-Office certificate into line with the requirements of Article 18.Identification of the e-Offices and associated websites, under Royal Decree 203/2021, of 30 March, approving the Regulation on the actions and operations of the public sector using electronic means.Furthermore, with a view to reinforcing the security of the services offered to taxpayers, access using the TLS1.0 and TLS1.1 protocols will be disabled.

The new electronic certificates will be signed by the certification service provider, Entrust.These electronic certificates are recognised by all major browsers and the Java Virtual Machine.The domains affected by this change are:


For entities accessing from applications developed specifically to use the Tax Agency's services, it will be necessary to confirm that their systems will support the new electronic certificates when invoking the services.To do this, they will need to check whether their systems trust the certificates of the Certification Authority (CA) with which the Tax Agency's new electronic certificates are to be signed.

These Entrust AC ROOT and AC INTERMEDIA public keys are attached below so that they can be downloaded and configured if necessary: