Payment process of your contractors

[Regina Sloan]

First flip and working on SOW. I've heard a few different ways, but wanted to see how flippers paid their contractors when working with HML that pay once projects are completed and inspected.

Do you use your own funds to pay a percentage down to get them on the books and then rest after completion? 
Nothing until project is complete? 

Follow the contractors payment plan? I've been several different plans, depending on the contractor I'm talking to. 

Thank you!