By including a per diem amount in the letter, the parties will not have to execute another payoff letter if the termination date. A 10 day payoff is crucial to getting your old loans paid off during a refinance.Learn how it works from start to finish. To get a payoff letter, ask your mortgage lender for an official payoff statement and let them know what the projected closing date is. Please accept this as my authorization to issue a payoff statement to. Through an effective date of . (B) A request for a payoff statement is not timely unless the trustee receives the request at least 10 business days before the trustee's sale. What is a Payoff Agreement? A payoff agreement is an informal contract in which a creditor agrees to accept the balance of a debt owed as full payment. 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.