What travel expenses does a per diem cover and how is it calculated?
There are two different categories of travel expenses that per diems cover. One is meals and incidental expenses, and the other is lodging expenses. Meals and incidental expenses cover all meals and expenses such as room service, laundry, dry cleaning, steaming of clothing, and tips for staff such as waiters, concierges, and maids. Lodging expenses cover accommodations for necessary overnight stays at hotels, motels, inns, resorts, and apartments.
Per diems can cover these two expenses, but employees cannot receive per diem reimbursement to cover transportation or mileage expenses. However, employees that opt to stay with a family member rather than in a hotel can be paid a lesser per diem rate that doesn’t include lodging—only meals and incidental expenses. For example, an employee traveling 200 miles by car would be able to receive a full per diem reimbursement for three meals daily on the road, incidental expenses like tips, and a night at a hotel.
According to IRS rules and regulations, there are two main substantiation methods for per diem rates: the high-low method and the regular federal per diem rate method. The high-low method uses only two per diem rates: one for places designated as high-cost locations and another rate for all other locations that don’t fall into that specific bucket. The high-low substantiation method may be used only if it is used for all amounts paid to an employee for travel away from home in the continental United States during the calendar year. In contrast, the regular federal per diem rate method simply uses location-specific per diem daily allowance rates that are set annually by the federal government for its civilian employees.