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In addition to the holder of the tax return themselves, a third party acting on their behalf, either a corporate partner or a proxy, may also submit the tax return.To file tax returns online, you need to identify yourself with your electronic certificate or electronic DNI.

To correctly view all parts of the form, before accessing, check the zoom and font size set in the browser (once the tax return has been submitted you can go back to the previous zoom and font size).

• On Internet Explorer, go to "View" on the menu bar (if not activated, click the F10 key), "Text Size" and select "Medium", in "Zoom" select 100%.You can also select the zoom from the nut icon.
• On Edge, go to the three horizontal dots icon in the top right corner and under "Zoom" select 100% with the "+" and "-" signs, then click on "Settings", "Appearance", "Fonts" and under "Font size" select "Medium (recommended)".
• In Google Chrome, go to "Settings" (by clicking the three vertical dots), "Appearance", "Font Size" and select "Medium (recommended)" under "Page Zoom" select 100%.You can also select 100% zoom from "Zoom in/out".
• On Mozilla Firefox, access the three line icon, in "Size" select 100% with the "+" and "-” signs, click "Options", "General", "Language and appearance" and in "Fonts and colours" select a size lower than the current one, if you do not see the form correctly.
• On Safari, go to "View", "Zoom" or "Zoom Out".

After logging in, you will be taken to the data completion screen.In this section, fill in the boxes marked with an asterisk as these are mandatory.

After filling in the details of the taxpayer and the representative, in section 3 you will have to indicate the option for the application of the specialities provided for in section 6 of article 95 bis, the capital gain declared, the maintenance of the ownership of the shares or holdings, the identification of the shares or holdings that give rise to the capital gains due to change of residence, as well as the percentage of ownership, the market value of the shares or holdings referred to in section 3 of article 95 bis of the Tax Law and the State to which the residence is transferred.

To register a record, click on the blank sheet with a green "+".You can delete records and move between them from the button panel.

At the bottom of the screen you can find the options available in the form.

To check the declaration for errors, click on the button "Validate declaration".If it contains errors, the "Errors" tab will be enabled with the description of the error and the "Go to Error" button that puts you in the box to modify or fill in.If the tax return does not contain errors, you will receive the message "There are no errors".

The form has a timeout period due to inactivity, we recommend that you save the declaration to avoid the loss of the completed data.Click on the button "Save" and you will get a .ses file that you can save in the path of your choice.If you do not select a path, it is saved in the "Downloads" folder or in the browser's default folder.The file will be called dat-113-NIF-ddmmaaaaaa.ses and you can retrieve it by clicking on the button "Load".

After validating and saving the tax return, you can submit it by clicking on the "Sign and Send" button.In the new window, check the "OK" box to confirm the filing of the tax return.The text box will show the content of the tax return in code.Finally, click "Sign and Send" to continue the filing.

The result of a correctly submitted tax return will be a reply page with an embedded PDF, the first page of which contains information on the tax return filing (registration entry number, Secure Verification Code, receipt number, date and time of tax return filing and details of the taxpayer). The following pages contain a complete copy of the tax return.