As far as I'm aware Germany, Luxembourg, Belgium charge both sides (employee and employer) of the statutory social security pension if you are a freelancer. Are there countries that don't make this a requirement? It is crippling having to pay out upwards of 19% of your income into a state pension.
Luxembourg Remote Work Forum
Discuss living and working remotely in Luxembourg: Which EU country doesn't charge social security for freelancers Any nomads from Luxembourg?