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.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. Nueva, Suite B109 San Antonio, TX 78205; or mail your request to the Bexar County Clerk's Office, 100 Dolorosa, Suite 104, San Antonio, TX 78205. A payoff letter shows the remaining balance on your mortgage, including fees, interest, etc. Learn more about what a payoff quote is and how to request one. A payoff request can be created and mailed for free. How long does it take to obtain a payoff?