Yes, it is a standard deduction for OTR truckers and I have never had one checked and have done a lot of them over the years. It is for meals, entertainment and miscellaneous expenses. If he had motel rooms or other expenses, they are additional deductions. It used to be figured at 50% of the total for DOT drivers. It has gone up in 5% increments over the years to where it was at 80% last year. When they get to 85%; they will stop the increase. 85% was the standard many years ago. The Form 2106 for each year will tell you what the percentage of deduction is for DOT drivers; which means that they have to transport materials, products or humans interstate. If you really have an issue finding out what the per diem rate was for each year, either Gail or I can help you with that. If he is strictly intrastate, he is only allowed to deduct 50% and, incidentally, these days out have to be days spent overnight away from home.