A mortgage gift letter is a statement that assures your lender the money that came into your account is a gift and not a loan. A short letter like this sample gift letter will cover all of the requirements your lender needs.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 mortgage gift letter is a document that helps satisfy the requirement that a borrower's down payment funds come from legitimate sources. A gift letter is a note from a donor to your lender regarding cash funds for your mortgage down payment. Download a gift letter for a mortgage. Download a gift letter for a mortgage. As noted earlier, your bank should provide a gift letter template for you to complete. A mortgage gift letter states that you received money as a genuine gift to use toward a down payment, rather than a loan. "A gift letter describes who the person is, their relationship with the borrower, and how they will give the gift check, cash, or transfer.