@scooterguyYou still have to pay social security which is over ~25% of the income. So effective rate would be 4% + 25% = 29%.
Can you please point me to the source where that is explained (best in Italian)? I believe it's not that high if you are a freelance and, in any case, there must be a cap. I do not believe you would pay 250K a year for social sec. on income of 1M.
Thanks