By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. It typically details the principal balance, interest due as of that date, per diem, any late fees, etc.Please include a per diem amount in the statement. Please email this information to as soon as possible. What is a Payoff Agreement? A payoff agreement is an informal contract in which a creditor agrees to accept the balance of a debt owed as full payment. 1. Interest. 2. Principal. 3. Deposits for escrow items, as applicable. Such deposits may include: taxes and assessments;. The Payoff Amount and Per Diem Amount quoted herein are effective through December 31, 2020. If you're thinking about refinancing your mortgage, use this letter to get it done.