Mortgage lenders ask for a letter of explanation to better understand your finances when determining whether to approve you for a loan. You should definitely keep the letter telling you that your loan was paid off in full.We'd also want you to keep at least the most current loan statement. A mortgage payoff letter can come in two forms. One form tells borrowers the remaining principal amount and interest they have to pay to close out the loan. To get a payoff letter, ask your mortgage lender for an official payoff statement and let them know what the projected closing date is. Yes. You can process a payment through this website or the automated phone system at 1-800-449-8767. This number is available 24 hours a day, 7 days a week. You should definitely keep the letter telling you that your loan was paid off in full. We'd also want you to keep at least the most current loan statement.