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.Click on Payments and then click on Request Payoff. Connect with your own Frost Mortgage Loan Advisor to take the first step home. Your Mortgage Interest Statement (Form 1098) will be mailed to you in late January. How do I request a payoff amount for my mortgage loan? Use SmartAsset's free Texas mortgage loan calculator to determine your monthly payments, including PMI, homeowners insurance, taxes, interest and more. The mortgage payoff calculator helps you find out. Request a Payoff Statement. Most of Texas' population resides in Houston, San Antonio, Dallas, Austin and Fort Worth, which are the five largest cities in the state.