This travel expenses tax deduction guide overviews which expenses are deductible, how to deduct them, and how to calculate them. Train and Bus Fares, Out-of-State. Yes.Attach train receipt or travel agency travel itinerary. Yes, business travel expenses are taxable. In most cases, the employer will reimburse the employee's business expenses for that trip. If you want to deduct your business expenses, you must complete Form 2106 and itemize your deductions. Transportation expenses. You may be asked to submit receipts for some travel expenses such as hotel and airfare receipts. Per diem is a daily allowance for expenses incurred while traveling for work. It covers meals, lodging, and incidental expenses like tips and transportation.