The Tax Code requires substantiation of all of the following - the amount of the expense, the time, place, or description, and business purpose/business relationship - EXCEPT when: a. expenses are clearly ordinary and necessary. b. The employer provides an advance to the employee. c. the standard meal rate is used for travel measl and travel meals are the only expense. d. The reimbursement is from a nonaccountable plan, and the employee deducts the expenses on Form 2016.