Hey Gemnjam, I would just be honest and tell him you can't do it financially. I'm not sure whether supervisors forget that we aren't made of money or just don't worry about it because it's not their problem- mine is the same, assuming I can hang around for a year to wait to hear the outcomes of fundings applications whilst earning nothing and not applying for other jobs. Just explain the situation- you could see if there's any work going in your department or if you believe you can finish by September then tell him that and go for it! Best, KB