I think once he gets a job you guys need to figure out how much of his paycheck he needs to save to get a new place (its often expensive since many places want a huge deposit or first and last months rent, plus often utility companies want a deposit for new customers). Then figure out how much you need from him to help you out, if you charge too much it might be harder for him to save up so he can move out. But at the same time he does need to help you out financially since I'm assuming you aren't rich and the extra cost of a third person living there might hurt you a little.