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.A short letter like this sample gift letter will cover all of the requirements your lender needs. A mortgage gift letter is a document that helps satisfy the requirement that a borrower's down payment funds come from legitimate sources. The gift letter, acknowledging receipt of the money. 9. 1) Who Can Gift the Money? Fill out your loan application. My daughter received a letter from a credit card company asking her for a copy of her govt issued id to complete her "application ". He has 9 years experience in the mortgage industry, and has an in depth knowledge of the complete mortgage process.