If you’re a business traveler, it’s in your best interests to understand what the IRS allows as business travel deductions. Be sure to read Developing a Travel Policy
In order to prorate your business expenses and to claim those the IRS allows, it’s first necessary to differentiate between business and non-business activities. While on a business trip, if you engage in non-business-related activities, the IRS does not require you to prorate transportation costs incurred to and from your main destination. However, this does not include any extra, non-business-related days spent at the destination.
Business trips made to tradeshows and conferences may be listed as deductions; however, they must benefit your business, and the convention, conference, or seminar must last a minimum of six hours daily. You’re also required to attend a minimum of two-thirds of the program. Keep copies of your registration forms and the receipt in order to document your attendance and to confirm payment.