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 is a note from a donor to your lender regarding cash funds for your mortgage down payment.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 for a mortgage shows your lender that you don't need to repay gift money toward your down payment. A gift letter should include the name and contact information of the donor and a statement that no repayment is expected. Received in the U.S. and meet all the requirements of the Gift Funds topic below.