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. The mortgage payoff calculator helps you find out.Be sure to submit the correct form to prevent any delays. Pima County Government services and news including Tucson, Marana, Ajo, Oro Valley, Sahuarita, Three Points and Arivaca. 1) Call the mortgage department and request an official principal payoff letter. 1. Enter the lender's name and loan account number. Instructions: Fill out the Grey Cells with the relevant information. A "power of sale" clause means the borrower pre-authorizes the sale of property to pay off the balance on a loan in the event of their default. Use SmartAsset's free Arizona mortgage loan calculator to determine your monthly payments, including PMI, homeowners insurance, taxes, interest and more.