By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. The first step is to get in touch with your lender or loan servicer.You can find their contact information on your monthly statements. Calculate your per diem allowance for your trip. Simply enter your travel dates and details to find out your per diem allowance. When you sign up for eStatements with Middlesex Savings Bank in MA you can start receiving your business bank statements online. Learn more and enroll. Per diem is an allowance for lodging, meals, and incidental expenses. The US General Services Administration (GSA) establishes the per diem reimbursement rates. Prepare and process mortgage, equity, and construction and consumer loan payoff requests from internal and external customers.