A 10 day payoff is crucial to getting your old loans paid off during a refinance. Learn how it works from start to finish.An IOU ( I Owe You ) is a legal document that sets out the details of a loan made between two people, a borrower, and a lender. A mortgage payoff letter will tell you that magic number. This form is furnished to give you a statement of actual settlement costs. Thank you for your interest in a Utah Power Credit Union Home Equity Line of Credit. Lender's and borrower's personal details (including names and contact details). Vanderbilt Mortgage is a nationally recognized manufactured home, modular home, and mobile home mortgage lender.