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.Discover more about per diem interest—the daily interest on a loan that occurs outside of the standard repayment period. The first step is to get in touch with your lender or loan servicer. You can find their contact information on your monthly statements. By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. Depending on your lender, you may have to sign in to an online account, call a helpline, or send a formal letter to start the request process. It typically details the principal balance, interest due as of that date, per diem, any late fees, etc. Select one loan in the main window and click Loan > Payoff Calculator on the main menu to open this window. Please contact Customer Support at 877-672-2265 to request the payoff amount for a Mortgage and Home Equity Line of Credit (HELOC).