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 for a mortgage shows your lender that you don't need to repay gift money toward your down payment.Use our mortgage gift letter A mortgage gift letter is a document that helps satisfy the requirement that a borrower's down payment funds come from legitimate sources. The goal of a gift letter is to provide the lender with proof of where the funds came from. "AmeriSave offers borrowers a standardized gift letter template," says Flynt. 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. In the letter, the donors must specify that the money is a gift. 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.