Disposable income.
I think it is when you have money left over after paying all of your taxes
A Surplus
You get to keep the money you have left over after paying the body shop. It is considered part of your insurance settlement.
discretionary income.
a fixed income
Its a profit
Profit
If the "money Left over' your talking about is the profit then highly unlikely the owner will give up that money. email me if you mean something different so I can understand your question better.
your net pay
discretionary income ka-ching!
Profit