I work for a staffing agency that staffs me in a patient's home. Is the cost of gas to that patient's home tax deductible? If yes, what percentage of my gas receipts do I deduct? I'm single with no kids and always end up owing money every year. I need every bit of help I can get. I sure wish I could deduct credit card interest. Then Uncle Sam would see that I really DON'T have extra money to spare.