Am I required to save my data?

No, you do not need to save the data you enter in the tax return at Lohnsteuer kompakt again.

As soon as you leave an input field, it is automatically saved in the background. Once you have completed a page, click the "Next" button at the bottom right of the page to proceed to the next step. You can, of course, change any entries you have already made later. Simply use the navigation to jump to the desired section.