https://training.kalzumeus.com/newsletters/archive/consultin... (You can jump to the section "Scaling A Consulting Business")
He also did a podcast with Brennan Dunn on the same topic:
http://www.kalzumeus.com/2012/10/10/kalzumeus-podcast-3-grow...
Would the subcontractor want to know how much he's getting paid vs the contract,
would this affect his incentive?
Finding good & reliable subcontractors is hard. When you do find such a person, my suggestion is to be as transparent as possible with them. The most probable reason why this person (who we think is good) is subcontracting is either they can't get high value engagements on their own, or don't like the rigmarole of finding good clients. If that is the case, they should understand the markup being charged by you.In the end, if it is a win-win situation for both, they would understand and be happy with it. Of course, the assumption here is that they are reasonable but that you'll have to judge after working with them for a while. I write this as a person who'd prefer working as subcontractor at this point of time.