A 10day payoff refers to the time it takes for your new lender to pay off your old loans during a refinance. 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. How to fill out the Payoff Request Letter Templates? 1. Enter the lender's name and loan account number. A Satisfaction of Security Instrument is a document that shows an individual has paid a deed of trust or a mortgage in full. 1. Begin filling out the authorization for auto loan payoff form with a group of major blank fields. Begin filling out the authorization for auto loan payoff form with a group of major blank fields. First Citizens provides a full range of banking products and services to meet your individual or business financial needs.