Identify yourself with digital signature (electronic DNI or certificate) or using the Cl@ve PIN access system (only natural persons).
If the taxpayer does not have an electronic certificate, the person filing must be authorised to file returns on behalf of third parties, either by being registered as a social partner or by being authorised to do so.
Fill in the "Subject" box, the type of tax return:in your own name or in the name of a third party (in this case it will be necessary to indicate the NIF of the interested party) and contact details in case it is necessary to contact you in relation to this procedure.
Click on the "Add file" link to select the file with the documentation you want to present.In the "Help" link, you can see the list of formats admitted for submitting files for this procedure, with the maximum size allowed for each file being 64 MB.
In addition, as indicated in the notice, it is necessary to complete and attach the PDF of the return template.
Click on "Select files" to access the file you want to attach.It is advisable that the name of the file does not contain any punctuation marks and that the file is saved on the local disc, in the folder "AEAT".Another option is to drag it from the file explorer or e-mail.
The file added will appear under "Documentation attached".If you need to add another part of this file, click "Include another part".
If you need to add new files, and not as part of the previous file, click "Add file" again.Lastly, click on the "File" button.
Once all the files have been attached, click on "Sign and Send".
Check "OK" and click "Sign and Send".
If everything is correct, you will get the answer screen with a link to "View printable format" containing the PDF with the submission information.