Specific error messages
Skip information indexNIF error of the procedure or declaration is not identified by the AEAT
If the error " NIF of the procedure or declaration is not identified by the AEAT " appears, 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 DNI electronic) or Cl@ve , you can check if the data is correctly recorded in the AEAT census from option "Verification of a NIF from third parties for census purposes" 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 the NIF and the first surname (or the first word of the company name). If you enter your first last name and cannot access your data, also check what happens if you enter the rest of your first name.
To carry out the procedure, you must enter the data in the same way and in the same order in which they appear in the census (first surname, second surname, first name or company name).
For more information you can consult the help on how to check if you are registered in "How to check a third-party NIF for census purposes"
If you have an electronic certificate or are registered in the Cl@ve system, you can also check this data in the Tax Labels, which you can consult in the electronic headquarters, from the "All procedures" section. ", "Other services". Only for natural persons who appear 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 databases of the AEAT , you can present 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 communicate 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 presentation" option located in the procedures for form 030.
You can also obtain the form in PDF for presentation on paper from the link in the "Information" section next to the list of procedures for form 030 . Here is the "Model Download". You can present form 030 directly at the Tax Agency office that corresponds to your tax address, send the form by postal mail to that address or present it from the "Form 030" option. Extraordinary presentation procedure - non-face-to-face". You will have to make the presentation on paper if the procedure you are going to carry out is registering in the census.
If you have questions about how to fill out the form, in this same section you can find the instructions for this in the "Instructions" link.
On the other hand, if the certificate used is a social collaborator, you can register online in the Census of Taxpayers of the AEAT a DNI or NIE from link "Model 030. Registration in the census of natural persons with DNI or NIE by social collaborators" located in the procedures of form 030.