A gift letter is a note from a donor to your lender regarding cash funds for your mortgage down payment. 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 mortgage gift letter is a statement that assures your lender the money that came into your account is a gift and not a loan. A gift letter is a piece of legal, written correspondence explicitly stating that money received isn't expected to be repaid. You can write a letter, sign it and hand it to a bank professional. They will accept the letter but, may still have you sign their form. Thinking of withdrawing from your IRA to make a down payment on a home? Provide Documentation:​​ Submit the gift letter, bank statements, and transfer confirmation during the mortgage approval process. Second, the reason your bank is asking you to provide a gift letter Is that the funds must be verified. You do not write a letter to withdraw funds.