Use our self-service options on this website to pay your taxes or make a phone or video appointment at your convenience. To be eligible, you must have filed your taxes for the last 3 years.Gov or calling 703-222-8234, TTY 711. 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. The decision to pay off a mortgage also comes with numerous tax considerations that should be thoroughly explored with your tax professional. Filling out this form is straightforward. This service allows clients to conveniently secure accurate and up-to-date payoff information regarding the outstanding balance on their mortgage loans. What is a payoff letter? A mortgage payoff letter can come in two forms.