In Austria, you don't need any capital at all, to start a EPU (One-Person-Company) which is really convenient.
You can do that in any country. Austria sucks donkeyballs for staring an actual company however. You need 35.000 in capital and you need to involve a notary. The additional cost for actually getting the company in place is a few thousand euro, you need to listen to the notary read down the contract you made yourself and then you are subject to all sorts of utterly bizarre rules and regulations such as publishing your yearly report in a specific newspaper which charges you an arm and a leg for this privilege.
Can we please fix this?
German administration feels exactly the same. I have heard that situation being called "Prussian administration": slow and cumbersome to operate like a Prussian tank, efficient in its task like a Prussian tank.
BTW, here is a Prussian tank: https://en.wikipedia.org/wiki/A7V#/media/File:A7v-wotan-dior...
But the whole point of a company is limited liability, an entity which can own property, sue and be sued, etc. separately from its collection of owners.
Unless you're doing something super simple, you don't want to mess around with a "single proprietorship" or the like.