The easiest way to keep good records is to do so near the time the expense was incurred. Consider using a large envelope for each trip to keep all receipts and other trip information. Take a few seconds to write the business purpose and/or customer names on the back of appropriate receipts. If you are lacking a specific receipt, write your account of the event, the date, and the money paid out and save it along with your other travel documentation. Take time also to document the business miles travelled.
If you maintain an expense report on a weekly basis for the expenses of that week, it will be considered a timely kept record for IRS purposes. If you account to your employer under an accountable plan, the rules are different.
For assistance in setting up a record system for your business travel, please contact us.