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The certificate selected to connect to the AEAT HEADQUARTERS differs from the certificate selected to perform the signature

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If you use Mozilla Firefox (All operating systems)

On Windows operating systems, go to "Tools" (or the three horizontal stripes icon), "Settings"; on Mac, "Firefox", "Preferences"; and in Linux, "Edit" "Preferences". Next, select "Privacy & Security", "Security", "Certificates" and "View Certificates".

The certificate you want to sign with should be in the "Your certificates" tab. Double-click on the name of the certificate and in the new tab look for "Alternative subject names" and check the information that appears, since it must be the same as that registered in the AEAT .

Example of certificate FNMT of a natural person.

The order in which the data is displayed is: NIF of a natural person, first surname of a natural person, second surname of a natural person and name of the natural person.

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For certificates FNMT of legal entity:

  1. Certificate of representative for sole and joint administrators. The order in which the data is displayed is: Name of associated natural person, first surname of natural person, second surname of natural person, NIF of natural person, Company name, NIF legal entity, administrator type, commercial register data

  2. Certificate of representative of a legal entity. The order in which the data is displayed is: Name of associated natural person, first surname of natural person, second surname of natural person, NIF of natural person, Company name, NIF of legal entity.

  3. Certificates of representative of Entity without Legal Personality. The order in which the data is displayed is: Name of associated natural person, first surname of natural person, second surname of natural person, NIF of natural person, Company name, NIF of legal entity.

Once this is done, you will have to check on our website how this data appears in the census of the AEAT , accessing the section "Verification of a NIF of third parties for census purposes", within the procedures of the "Form 030. Census of taxpayers - Census declaration of registration, changes of address and/or changes in personal data."

If the census data ( NIF , surnames and first name or company name) do not match the data on the electronic certificate, it will be necessary to obtain a new certificate.