LOAN PAY-OFF DEMAND REQUEST FORM. This form must be completely filled out and submitted along with all required documents.Per diem is an allowance for lodging, meals, and incidental expenses. The US General Services Administration (GSA) establishes the per diem reimbursement rates. A 10 day payoff is crucial to getting your old loans paid off during a refinance. Learn how it works from start to finish. It typically details the principal balance, interest due as of that date, per diem, any late fees, etc. By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. Per diem rates lookup Allowances for lodging, meal and incidental costs while on official government travel. Attach copies of related documents such as PVs, P-Card statements, etc.