Specific error messages

Error NIF of the procedure or declaration is not identified by the AEAT

If you receive the error " NIF of the procedure or declaration is not identified by the AEAT ", check that you have correctly entered the NIF or CIF and the name and surname or company name.

If you have a digital signature (certificate or electronic DNI ) or Cl@ve , you can check whether the data is correctly listed in the AEAT census from the "Verification of a NIF of third parties for census purposes" option available in the list of procedures for form 030.

Remember that you can access the electronic procedures for the different models from the "All procedures" option on the website.

Enter NIF and the first surname (or the first word of the company name). If you enter your first surname and you do not access your data, also check what happens if you enter the rest of your name.

To complete the procedure, you must enter the data in the same way and in the same order as they appear in the census (first surname, second surname, name or company name).

For more information, you can consult the help on how to check if you are registered in the census in "How to check a third party's NIF for census purposes"

If you have an electronic certificate or are registered in the Cl@ve system, you can also check this information on the Tax Labels, which you can consult in the electronic office, from the "All procedures", "Other services" section. Only for individuals listed in the taxpayer census.

If you are not registered or your data is not correct

In order to carry out procedures through the AEAT website, it is necessary to be registered as a taxpayer. If you are not registered and do not appear in the AEAT databases, you can submit a form 030, " Census declaration of registration in the Census of taxpayers, change of address and/or variation of personal data ".

Form 030 is also used to report changes in identification data, address, as well as changes in personal and family data, such as marital status, birth of children, changes in the degree of disability, etc.

You can submit it electronically to modify your data from the "Modification or submission" option located in the procedures of model 030.

You can also obtain the form in PDF format for submission in paper form from the link in the "Information" section next to the list of procedures for form 030. Here you will find the "Model Download". You can submit Form 030 directly to the Tax Agency office that corresponds to your tax domicile, send the form by post to that address or submit it from the "Form 030" option. Extraordinary submission procedure - non-face-to-face". You will have to submit the application in paper form if the procedure you are going to carry out is registration in the census.

If you have any questions about how to complete the form, you can find instructions in this section using the "Instructions" link.

On the other hand, if the certificate used is that of a social collaborator, you can register online in the Census of Taxpayers of the AEAT a DNI or NIE from the link "Model 030. Registration in the census of natural persons with DNI or NIE by social collaborators" located in the procedures of model 030.