The per diem rate go from $39 - $64 a day. Go to pub 1542 on the irs site or to
GSA - Domestic Per Diem Rates. Just above the per diem breakout check the wording look for PRIMARY DESTINATION. There it will list the state/city if the city is not listed it is considered at $39 a day per diem. Per diem is driven by the PRIMARY Destination. If you are going to Washington, Dc and it takes you 4 days the per diem for those days is $64 a day. If you are going to Cut & Shoot, TX and it takes you 4 days the per diem for those days is $39 a day. You don't have to track where you slept, ate breakfast lunch or dinner.
When he gets an assignment it will estimate the days to get there look up the per diem rate for the PRIMARY destination, not the little cities in between just put it down on a list: 01/01/2007 Washington,DC 4 days $64.00 $256
01/05/2007 Cut & Shoot, TX 4 days $39.00 $156
At the end of the year or month just total up the days and add up the per diem.
Can't get much simpler than that.
The publication you referenced the section you quoted eliminates the guess work. But in the recordkeeping seciton it also says keep good records. If you continually run to locations in the lower per diem bracket and you are audited it is questionably that the figure they are quoting would hold up. If on the other hand you have a list of destinations and days and per diem - who can question that.
My husband works for PRIME while he was in training they paid him a per diem allowance and I started tracking his actual per diem. They reimbursed but even after the reimbursement the actual is almost $2,000 difference in his favor that he can deduct. Now he has his own truck and I am tracking him and 3 others using the PRIMARY destination and when I do their taxes I will have complete confidence in the figures that I put down for their per diem. It is 80% for the upcoming tax time.
But if you take the $52 a day across the board and the highest per diem is only $64 it could be looked at as 1] he did all high dollar per diem runs or 2] it needs a look to check out validation. It is always better to have it in black and white. So if Uncle Sam comes looking just pull out the paper and say look.
If you can't download the per diem table send me a valid e-mail address and I will send you a copy for the new one and the old if you need it. No-charge - The new one takes effect Oct 1, 2008.