Translation:He works at the company, but he is not on the payroll.
This is the Dutch term for a freelancer. It means zelfstandige zonder personeel in other words someone who has his own company without employees (so he or she is being hired by another company). Zelfstandige means independent one, on other words someone without a boss, someone who owns his own company.
I am curious about the word "loonlijst". Does it literally mean what I think it does? A "loan list"?