From the Expected Expenses screen, click the blue text Manage Travel Allowance and then click the button Add Travel Allowance. What Expenses can I Claim?A Purchase Order should be prepared to cover the cost of Conference Registration fees. All conference information should be attached to the Purchase Order. Your travel days are going to be deductible if you meet that primary purpose being business so you can see how you can structure this trip. Take on your out-of-town business trips. If you do not fit any of these categories,. A per diem payment is a daily allowance given to employees for businessrelated travel expenses. You can deduct your travel expenses. C. "Per Diem" means allowance for meals and lodging associated with outoftown business travel. D.