One form tells borrowers the remaining principal amount and interest they have to pay to close out the loan. The mortgage payoff statement is a document that provides a comprehensive breakdown of the remaining balance on a mortgage.You'll need to request a 10day payoff letter from your current loan servicer, which you may be able to do online. Satisfaction of Security Instrument: This document shows that a loan has been satisfied and the Security Instrument is terminated. The payoff statement is a vital document due to the interest on your loan balance, which is added daily. 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.