1) North Carolina General Statutes §45-36.9 requires that you must submit a satisfaction instrument to the. Q: How do I request a payoff quote for my NC Housing Finance Agency loan?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. There's a process to getting the mortgage payoff statement. Any excess amount that you pay will be refunded. 1) Call the mortgage department and request an official principal payoff letter. This guide will help you learn mortgage math, allowing you to confidently calculate how much you need to pay off your mortgage. In the formula, B stands for the payoff balance due in dollars. L is the total loan amount in dollars.