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. • The Note Form must match the legal documentation requirement as described in the product description.Filling out a gift letter in OP's case would actually be mortgage fraud. Upvote 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 is a note from a donor to your lender regarding cash funds for your mortgage down payment. Texas CashOut A6 Specific Documentation Requirements. Notice Concerning Extension of Credit. A mortgage gift letter is a document that helps satisfy the requirement that a borrower's down payment funds come from legitimate sources. Your ability to use gift money for a down payment depends on several factors. In this guide, we review everything you need to know.