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. The goal of a gift letter is to provide the lender with proof of where the funds came from.A gift letter for a mortgage is proof to the lender that money you've been given for your home purchase is a gift, not a loan to be repaid. The most important document required is a gift letter. 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. To use gift funds, you must provide a gift letter proving the money is not a loan. The letter should state that the person giving you the money is not getting something of value in return, such as an ownership stake in the property. The lender will need a "gift letter" from the donor to make sure your down payment help has no strings attached. Gift letters reassure your bank that the money you're receiving is a gift, not a loan. A gift letter from the donor to the recipient, detailing the amount gifted and its intended purpose.