The letter must explain who is gifting the money, where the donor's funds are coming from and the relationship between the donor and the recipient. A gift letter for a mortgage is a legal, written statement your lender may require if you're gifted cash to buy a home.Gift Letter For Mortgage Template. Your lender might give you a template to follow if you tell them you're using a gift for your down payment. Please complete this form to document your gift of stock. Here's a sample gift letter you can use to prove that the money is truly meant as an outright gift, with no expectation of repayment. A gift letter is a note from a donor to your lender regarding cash funds for your mortgage down payment.