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. Mortgage gift letters tell the lender that money for your loan came from a gift.Lenders require gift letters when necessary. Download a gift letter for a mortgage. You can use gifted funds to make a down payment, but your mortgage lender will want to know some details before they allow you to use it. A short letter like this sample gift letter will cover all of the requirements your lender needs. 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. To use gift funds, you must provide a gift letter proving the money is not a loan. While the gift letter is the main document, your client may also need to provide additional documentation. The lender will need a "gift letter" from the donor to make sure your down payment help has no strings attached.