The City of San José processes requests for payoff demands of existing homebuyer and home repair loans, and affordability restrictions (i.e. 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. What Is a Letter of Explanation? A letter of explanation is your chance to answer any questions a lender might have about your loan application. It should include specific details such as the loan account number, outstanding balance, and contact information. Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started. The mortgage discharge or lien release is recorded.