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.Go back to that mortgage officer, and tell him it's a gift. Ask him what he needs in the way of documentation to show it's a gift, not a loan. 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. A gift letter is a document stating that any money received from family or friends is a cash gift and not a loan. A mortgage gift letter is a document that helps satisfy the requirement that a borrower's down payment funds come from legitimate sources. Mortgage seasoning refers to the time lenders require for funds to have been in your bank account in order to approve you for a home loan. Special Attention of: Transmittal: Handbook 4000.1. All FHA-Approved Mortgagees.