Any excess amount that you pay will be refunded. 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. You can either send an letter signed and dated stating that you are withdrawing your offer or you can use a TREC document if your Realtor drew up the contract. Depending on your lender, you may have to sign in to an online account, call a helpline, or send a formal letter to start the request process. A satisfaction of mortgage is a crucial document in the mortgage repayment process. It shows that your home outright belongs to you. You might fill out the paperwork to wire the money to your lender. Step three: Confirm the account is closed. How to Document Gifted Funds Being Used for a Down Payment.