By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. The information reasonably necessary to calculate the payoff amount as of the requested payoff date, including the per diem interest amount; and. (3).Please include a per diem amount in the statement. Please email this information to as soon as possible. It typically details the principal balance, interest due as of that date, per diem, any late fees, etc. 1) North Carolina General Statutes §45-36.9 requires that you must submit a satisfaction instrument to the. Please request that the payoff include a daily per diem figure, if possible. The information reasonably necessary to calculate the payoff amount as of the requested payoff date, including the per diem interest amount; and. (3). Requested payoff date, including the per diem interest amount; and. (3). FAQs: What do I do if I want to return my leased vehicle or buy it out?