How can I amend data that has already been submitted?

If you have already submitted your tax return electronically to the tax office but need to make some changes, this is not a problem. Simply restart the submission process by clicking on the navigation link "Submit tax return". In the middle section, you will find the button "Restart submission of tax return". If you have already submitted the signed (compressed) tax return, please inform the relevant tax office in advance. Otherwise, you can resubmit your tax return free of charge if there are changes.

Then print out the compressed tax return, sign it, and send it by post to the tax office. The Telenumber can be used to link the electronic tax return with the paper document.