To my knowledge here in Germany registering a company is pretty much the same whether you're from Germany or from a different EU country. You don't need to live in Germany or anything.

Of course you still need to know your way around local taxes, legal obligations (of the shareholder, of the company) etc. etc. but that's the case anywhere in the world.

In the EU you will find very different laws and tax systems depending on the country. Quite large differences in regards to culture as well.

One example: If you're a cross-border worker you'll likely have to file multiple tax decelerations (one for each country), which can be quite complicated if you don't speak the local language (and even if you do).

> If you're a cross-border worker you'll likely have to file multiple tax decelerations (one for each country)

Yes, if you have sources of income in multiple countries, you might have to. But if you're (only) working on the other side of the border and this is your only source of income, agreements on double taxation and tax harmonization between the EU member states should actually prevent that. Heck, I even worked in the US once, declared my taxes there and didn't have to do my taxes back home in the EU anymore.