The mortgage payoff calculator helps you find out. Our mobile and web services allow you to obtain real time account information, deposit checks, pay bills, transfer funds, purchase on the go, and more.Filling out this form is straightforward. 2) Once you receive the principal payoff letter, write the check for the exact amount and in the memo, write: "Payoff" and the mortgage account number. 2) Once you receive the principal payoff letter, write the check for the exact amount and in the memo, write: "Payoff" and the mortgage account number. Down Payment Assistance. Home Investment Partnerships Program (HOME). Enter your details below to estimate your monthly mortgage payment with taxes, fees and insurance. Not sure how much you can afford? Closing date, the Lender's authorized representative must fill out and execute the.