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. Mortgage gift letters tell the lender that money for your loan came from a gift.Lenders require gift letters when necessary. Download a gift letter for a mortgage. 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. You can use gifted funds to make a down payment, but your mortgage lender will want to know some details before they allow you to use it. The gift donor may not be a person or entity with an interest in the sale of the property such as the seller, real estate agent, builder, or developer. If their gift is too large, they may have to fill out a gift tax form when filing returns. Any gift funds, or gifts of equity, must be reflected on the Uniform Loan Application Form (Form 1003). A gift letter for a mortgage shows your lender that you don't need to repay gift money toward your down payment.