By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. The Payoff Amount and Per Diem Amount quoted herein are effective through December 31, 2020.Searching for a fillable Mortgage Loan Payoff Letter Template? Use our easy editor for PDF files and fill this form out quickly. Here are some sample statement templates that you can make use of to know more. Works 1,000 hours in a fiscal year. •. Works 125 days in a fiscal year, if paid on a per diem basis. Established charges and prospectively determined per diem rates.