A payoff letter provides instructions on how to pay off a loan with a lump sum before the loan term ends. Learn how payoff letters work.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. Sign into your Member Center and go to your To-Do List. All you have to do is log in to your account where you want to transfer the balances and request a balance transfer online. Learn how to transfer balances to your Capital One card. Check here to see if you are eligible to transfer a balance to your Capital One credit card. 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.