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 gift letter is a note from a donor to your lender regarding cash funds for your mortgage down payment. A mortgage gift letter is a document that helps satisfy the requirement that a borrower's down payment funds come from legitimate sources. Please click on their website to fill out an application. Call our Mortgage Hotline at 800-442-6666 ext.