By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. GSA establishes the maximum CONUS (Continental United States) Per Diem rates for federal travel customers.Discover more about per diem interest—the daily interest on a loan that occurs outside of the standard repayment period. United States when holding court away from their homes. A 10 day payoff is crucial to getting your old loans paid off during a refinance. Learn how it works from start to finish. Assist the homeowner in filling out a ―Qualified Written Request‖ using the National Consumer. Funds"), as set forth in the Award Letter. Per diem rate for each patient. It allows for convenience and flexibility in the disbursement of a loan.