Slovenia has a "sole proprietorship" system that's fantastic for IT professionals since it has standardized costs, which means in the end you pay 4% tax on any income up to 150k€.
But you also pay FIXED "social contributions" (aka. tax) for pension and healthcare since you, as an "s.p." are considered to have a minimal pay... no matter how much money you make. This is a little under 500€/month. This is due the first month you register your business.
This leads to a reducing effective tax rate - the more you make, the less you pay.
We also have no way of doing business if you can't afford the ~500€/month tax. As far as the government is concerned, everyone starting a small business just "magically" starts making enough money from month 1.
Watching ex-communists (who are still in power) trying to work this whole capitalism thing is hilarious sometimes.