rake-off 
noun informal
A commission or share of the profits from a deal, especially one that is disreputable: corrupt officials have more chance of a rake-off when expensive goods are involved...
- Paramilitaries might get a rake-off from counterfeiting, but not a great deal is known about it.
- ‘If any of the rake-off is used in the future presidential campaign, it will be a serious scandal,’ Sun said.
- There will no doubt be other rake-offs involved.