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.Call. 1-888-340-2265. from 7 a.m. Maximize your tax savings with the student loan interest deduction—find out what qualifies and how to report it on your return. Step 1: Get the payoff amount and instructions. If you have an unpaid tax bill, you should pay it in full immediately to avoid accruing additional penalties and interest. For Complete list of Payment Options Please click here. , representing payment in full. Transaction date of Harris County Tax Office online payment portal; transaction date of telephone payment. Q. Where can I pay my property taxes?