The purpose of the tax safe deposit box is to gather all of the documents and/or supporting documents you will need to file with your tax return in one place. 
To make this easier for you, an automated transaction categorisation algorithm has been set up based on the Spuerkeess transaction history linked to your current account(s).
Third-party accounts held with your other banks are not currently taken into account.
You are free to add to or modify the contents of your safe deposit box at any time through the safe deposit box or your transaction history if you notice any categorisation errors or omissions. 

Additionally, you can upload any document and/or supporting document from other banks or entities directly in their tax category.
Please note that the tax certificates generated by Spuerkeess at the beginning of the year, which are usually available in your e-documents in S-Net, will also automatically be transferred to your tax safe deposit box.