Both purchased, as well as academy players are subjected to taxes, meaning various percentages of your profit would be cut depending on the time frame you're selling a player after you've either purchased or scouted them.
I advise inspecting the official documentation below:
https://www.managerzone.com/?p=manual_faq&cat_id=1362
f0gshad0w wrote:I just sold a player for 220000 and only received 11000. Why???
in this case it is most likely that you have sold a player which you bought no more than 28 days ago. If you had bought the player for almost free, this means 95% of your now calculated 220000 profit would be cut as per taxation rules.