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 gift is to be applied toward the purchase of the property located at: (Property Address). 3).Here's a sample gift letter you can use to prove that the money is truly meant as an outright gift, with no expectation of repayment. Download a gift letter for a mortgage. A mortgage gift letter is a document that helps satisfy the requirement that a borrower's down payment funds come from legitimate sources. Gift Letter For Mortgage Template. Your lender might give you a template to follow if you tell them you're using a gift for your down payment. 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 written explanation provided to your mortgage lender when someone else gives you money toward a home purchase. To do that, you should have your grandparents draw up a gift letter that you can then give to a mortgage lender.