Employers can deduct travel expenses paid or incurred during a temporary work assignment if the assignment length does not exceed one year. You can deduct actual expenses or the standard mileage rate, as well as businessrelated tolls and parking fees.The expenses he incurred the first three days of the trip may be deductible business expenses. Use this free travel expenses writeoff calculation sheet to find the estimated amount you can write off for travel expenses. This form is not required to complete your expense report but your agency may request it. When your employees travel out of your tax home, the cost can be counted as a business travel expense deduction. Airline, train, or bus fares — This includes first-class. To claim travel expenses, you must be traveling outside of the area of your tax home for longer than a work day. If your client uses their vehicle for both work and personal use while traveling, they must allocate expenses accordingly. Beyond receipts, ask employees to attach anything that provides proof that the expenses are legitimate and compliant with corporate policy.