Business Trip Reports are Essential for Audits of small businesses
If you operate, or are a partner/member of a small business, the IRS targets your company for audits, particularly for those that generate under $100,000 of gross income or have losses, regardless of income. 
The IRS always targets vehicle expense, business meals and entertainment, home office and travel expenses in these audits.  Always!
Do yourself a favor!!  Write a “Business Travel Trip Report” for every trip you take away from home, overnight, and that is outside your area.  You will thank me many times over for giving you this vital tip.
A Business Travel Trip Report should have the following information, at a minimum:
Where did you go?
Why did you go?  What is the principal purpose for the trip?  If the trip is incidental to the business purpose, only count the business days and forget the airfares.  Going to the Superbowl?  Forget trying to make this a business trip.
The date and time you left home and returned.
The total days gone and number of days spent on business.
Air Fares or miles if you used a vehicle
Car rental expense
Transportation while at business location (taxi, train, etc.)
When you get home, print this off and reimburse yourself from the business and give the trip report to your bookkeeper to save for at least four years where even you can find it.
If you would like a sample of one of mine, respond to this e-mail and put “Trip Report Sample” in subject line.

Jerry W. Slade, EA
408-236-2444