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.San Antonio, TX 78269-2408. Or Fax to (866) 493-1441. All loans subject to credit approval. The balance on your statement is NOT the amount needed to pay off your loan. Payments we receive will be applied in accordance with the terms of your mortgage note. , representing payment in full. You've found the one! SWBC Mortgage Corporation and our team of mortgage loan experts are here to help you find the happiest way home.