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.After the online request form and signed authorization document are submitted, the payoff will be provided within 5 business days. Request Loan Payoff Form. When you need help with Loan Services from 7 17 Credit Union in Ohio, start with our loan servicing FAQs. If you still have questions, contact us today. 1) Call the mortgage department and request an official principal payoff letter. When you need help with Loan Services from 7 17 Credit Union in Ohio, start with our loan servicing FAQs. If you still have questions, contact us today. You can submit your loan payoff at any Heartland Bank branch, submit a transfer through Online Banking or mail your payment to the following address.