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. Washington state per diem rates. Current rates - as of Oct. The Payoff Amount and Per Diem Amount quoted herein are effective through December 31, 2020. The Payoff Amount and Per Diem Amount quoted herein are effective through December 31, 2020. Payment will be sent to lien holder. Once screening is complete, enter the CAIVRS confirmation code on VA Form.