By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. A payoff letter provides instructions on how to pay off a loan with a lump sum before the loan term ends.Learn how payoff letters work. Please provide payoff information for the above referenced mortgage. Also, please provide loan number and per diem interest. The Participation Application from Seller in which Seller seeks approval to participate in the Low Interest Rate Mortgage Program. (b). • The payment letter must disclose all monthly payments included in the mortgage payment. Please contact one of our agents at 1(800) 255-5897 for more information. 5 Final regulations implementing statutory provisions usually indicate whether the effective date listed in the. 92 Although some of the.