Norway is very simple too. Most people can just do nothing at all. The way it works is that the tax authority creates a proposed tax record and notifies you by SMS or email or both or even by letter if you ask for it. If you agree that it is correct you don't need to do anything at all, otherwise you log in to the web site and adjust whatever needs adjusting in a bunch of simple forms.

The tax authorities also have a duty to calculate the taxes in the way that benefits you most.