Yes, and in slovenia it's 25%, and in other countries its at mostly the same level. Then theres's health insurance (12.92% in slovenia). Only after that you get income taxes. And above that you get VAT (22% here) for your services. So basically, you charge your customers ~5k, and get ~2k of net payout (the rest goes to the government) ... and that's without any actual business expenses.
Denmark has even higher taxes, but the country still works better than italy.
Calculating taxes is pretty easy in most countries, especially if you have to do it yourself (eg. independent contractors, etc.).
The only problem here is, that once one country fails (eg. they stop paying out pensions), all the other ones will go into full panic mode, and the shit will hit the fan.