Form 303 - Technical assistanceSkip information index
Paper filing of Form 303
For paper filing, the "Form 303.VAT Self-assessment" you have a form to fill in online and obtain the PDF with the return, previously validated by the server of the AEAT.
From 1 April 2021, the requirements for access to the pre-filing of form 303 have changed.
Until now, this procedure allowed unauthenticated access, i.e. any person could generate pre-filed returns for any taxpayer liable to file a pre-filed return.
With the change implemented in the pre-filing service of form 303, basic authentication is required:DNI + Validity date, if it is a permanent DNI the date of issue will be required, or NIE + support number.
Only the NIF of natural persons will be accepted.In the case of entities, enter the NIF of the natural person making the declaration.
From May 2021, pre-filings of natural persons may only list the authenticated holder as the holder of the pre-filing.In the case of entities, enter the NIF of the natural person making the declaration and then indicate the details of the entity on the form.
Fill in the Period, the NIF and the Surname and first name or the Company Name.If you have a file previously generated from the form (SES extension), use the "Upload" button to retrieve the data.If not, click "OK".
You will access the "Identification" window of form 303.Make sure you answer all questions correctly (YES / NO).
On the top panel you will find all the functionalities of the model.
The button "Identifying data" takes you to the previous window, where you can consult the data entered, modify some of them or load the data file (SES).
You can see the index of sections by clicking on the button "Sections" or access the different pages with the navigation arrows.
Click on "Draft" to obtain a pdf file with the data entered so far.The document is not valid for filing, but can serve as a reference.
The button "Save" allows you to obtain an SES file with the declaration data, which you can later retrieve from the "Load" option in the identification data window.File generation does not require the tax returns to be validated (they may contain errors or be incomplete).If you do not select a directory, this file will be automatically saved in the "Downloads" folder of the system or in the directory set by the browser to save downloaded files.The file shall have the name NIF of the declarant-303-ejercicio.ses
Before submitting the declaration, use the button "Validate" to check for warnings or errors.A list will appear with the "Errors and notices" detected.The "Go to Notice" or "Go to Error" buttons will directly display the box or section to be corrected.
Remember that notices are informative and do not prevent submission.Errors, on the other hand, need to be corrected.
Go to the last page to check the result of the declaration.Click on "Select Deposit/Return".
If the type of tax return is "Owed", the section will be enabled to include the bank account.It is not necessary to complete this form if payment is to be made in cash or if deferral is requested.
If the result is negative, select "To be offset" or "Refund request" (only for the last period).You must include an account number IBAN where you are the account holder and where the refund will be made.It may be an account open in Spain or abroad (UE/SEPA).
After selecting the type of declaration, and once the declaration has been validated without errors, click on "Generate pre-declaration".
A PDF will be generated with the contents of the return in two copies, one for the taxpayer and one for the Collaborating Organisation.which you must sign and hand in at the bank (if it is to be paid in or refunded) or at the offices of the AEAT (to be refunded and in all other cases).Remember to write NIF on the deposit or refund document and sign it before submitting it.