Authorized drivers shall be reimbursed for reasonable parking and toll expenses incurred while conducting state business in a privatelyowned. This comprehensive guide on "how to charge clients for travel expenses" will walk you through the essential steps while keeping their satisfaction in mind.Per diem is an allowance for lodging, meals, and incidental expenses. The US General Services Administration (GSA) establishes the per diem reimbursement rates. Business travel is tax deductible! Every dollar you spend on travel related to your business may help you legally save on taxes. The IRS has updated rules (Rev. Proc. 59) for determining the amount of an employee's ordinary and necessary business expenses for lodging, meals, and. Employers can deduct travel expenses paid or incurred during a temporary work assignment if the assignment length does not exceed one year. Take on your out-of-town business trips.