By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. We represent lenders in residential Termination requests.Customer: I Check the payoff letter and it does not have a per diem amount. We urge that, to the extent possible, the forms be filled out electronically on fillable PDF forms. In-Service Members: FAQs for people who are currently working in a TRS-eligible position. 4000 Travel and Per Diem. 387. . 1,800. 3,000.