This guide explains how to document gift funds for a mortgage and meet lender requirements. 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. A mortgage gift letter is a document that helps satisfy the requirement that a borrower's down payment funds come from legitimate sources. 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. Sign a gift letter: Donors must sign a gift letter that certifies the funds are a gift, not a loan. A short letter like this sample gift letter will cover all of the requirements your lender needs. How do I give a gift fund? Complete and send the Stock Donation LETTER OF INTENTION.