Ah OK. In our case the various sources of income have to provide the information to the tax authority, and this is summarized in the prefilled web form (that yo

Ah OK. In our case the various sources of income have to provide the information to the tax authority, and this is summarized in the prefilled web form (that you approve by clicking submit). Now, it is your responsibility to make sure that all of the sources are indeed there but for normal people it is the salary only. It happened to me once that one source was missing and I was not happy at all (but said source provided me pronto with what to put where in the form). Overall I would say that our tax system is complicated (as all trax systems) but made really simple for average people. Also we do not have any companies such as yours that would provide software to make your taxes. If you want some help you can either contact a specialized finance person (this usually costs 200€ and is useful only if your case is really complicated) or you have free help areas at town halls (mairies). Or clear directions from the providers. But as I said, it is for a select population, not for the everyday Joe who just clicks three times. There was even national ads on the radio about that.