[_gfrc]

Maybe we are talking about different things, but you can definitely pre-fill your tax form with employer and social security data in Germany. In that case, you only have to add information if you want to claim deductions higher than the "Werbungskostenpauschale".

Things usually only get difficult when you are self-employed or have difficult deductions.

[luckylion]

Sure, you can do that, or you can have a software do that. But you won't get it filled out by the state + "sign here if everything looks okay".

Plus you always need extra forms for savings etc.