Can I apply for the Luxembourg self-employed permit while already inside the country?

Luxembourg's self-employed route is built around a pre-entry authorisation. You request the temporary authorisation to stay from outside the country, through the Immigration Directorate or a Luxembourg diplomatic or consular mission, and only travel once it is granted.

This sequencing matters because trying to switch into self-employment from inside the country without that prior authorisation is not the intended path. If you are already in Luxembourg on another status and want to become self-employed, get specific advice on your situation, since the standard procedure assumes the authorisation is obtained before arrival.