> So, let's say you're bootstrapping a new business and earning 1500€/month as a solo operator with no employees. How much does the overhead of the endeavor cost you?
If you are earning 1500€ per month you can just be a "micro-company" (this works up to 75k€ per year of gross income).
You'll get taxed roughly 25% on that income, and have a fixed fee depending on the city you live - for me it's around 400€ / year for instance. Everything is done by internet, the only thing you have to do is report every month on the state website how much you earned last month, which takes roughly 30 seconds if you have proper accounting.