Earlier quoted context omitted.
I wouldn't take namday's comment at face value without some kind of citation. It could be that it works similarly to Croatia - it's not illegal, but if you are found to be "a hidden employee" you simply owe taxes and retirement/healthcare contributions as if entire income of your single-employee company was your salary. It could be that it's actually illegal in France. But many people are confused about how it works…
I completely agree with what you say, it depends on the specific setup (specifically, whether a judge will consider that it was an employment relationship). My statement was in response to someone who was clearly describing an employment relationship: > The "employee" creates a single-person company in Poland
Is it really illegal in France or do you just owe more taxes/contributions than if you had multiple clients (which would allow you to take part of the revenue as company profits, instead of having to channel it all as a salary)?
Looking at your comment [0] it sounds like it might not be illegal (provided you pay the required taxes/contributions)?