I was talking with a client, an airline pilot, about travel expense record keeping. He uses a great system. Use your iPhone or Smart Phone to input expenses as they happen in your calendar. As soon as the check comes from dinner, he puts the amount and location. At the end of the month his costs are all in one place and its easy to have a clean record for his accountant. This is a simple way to get all the deductions you can while keeping the pain and suffering to a minimum.