A payoff agreement is an informal contract in which a creditor agrees to accept the balance of a debt owed as full payment. Include the loan or mortgage number.Create a Loan Payoff Letter online and download it as a PDF or Word document. Customize and print a blank Loan Payoff Letter for free. Loan Payoff Request correspondence on SSFCU letterhead. 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. San Antonio, TX 78269-2408. Complete the Release Documentation. Knoxville TVA Employees Credit Union offers personal and business checking, savings and loans to the East Tennessee area.