Business travel expenses can save you money at tax time! Learn about deductible travel expense rules and maximize your savings today.When travelling for business purposes, not only the transporation portion is deductible, but also lodging while away as well as meals. This guide takes the top corporate travel expense questions and answers them for you. The good news is that the majority of the costs of business travel can be tax deductible. However, the Internal Revenue Service (IRS) requires a few essentials. If you plan on combining personal travel with your business travel plans, you must make a note of this on your Travel Authorization form. Writing off travel expenses while away on business can save you hundreds of dollars per trip. Spend the majority of your trip on business. The IRS measures trip length in days.