Of interest per day. By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date.Please accept this as my authorization to issue a payoff statement to. Through an effective date of. The first step is to get in touch with your lender or loan servicer. You can find their contact information on your monthly statements. It typically details the principal balance, interest due as of that date, per diem, any late fees, etc. Title IV aid is earned in a prorated manner on a per diem basis up to the 60 percent point in the semester. Here is an easy 3-step process to start getting loan signing appointments.