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. This guide explains how to document gift funds for a mortgage and meet lender requirements.Second, the reason your bank is asking you to provide a gift letter Is that the funds must be verified. Mortgage gift letters tell the lender that money for your loan came from a gift. Lenders require gift letters when necessary. Mortgage Gift letter is what the donor of the gift writes to the lender stating that he has offered a gift of money to the home buyer. The purpose of this letter is to document that the money does not need to be repaid as well as the donor's name, contract information, and relationship to you. Yes, all lenders will require a gift letter. Although you may have the funds, the lender needs to confirm that you won't have to repay the gift. Keep in mind, the amount of the transfer must match what's stated in the gift letter.