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 guide explains how to document gift funds for a mortgage and meet lender requirements.What should you include in 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. A gift letter for a mortgage shows your lender that you don't need to repay gift money toward your down payment. To use gift funds, you must provide a gift letter proving the money is not a loan. The purpose of a gift letter is simply so the lender can ensure you won't have to repay the money you've received for the down payment. The lender will need a "gift letter" from the donor to make sure your down payment help has no strings attached. Your mortgage gift letter or others need to include all the basic information so that you don't have to face any problems in the future.