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 gift letter for a mortgage shows your lender that you don't need to repay gift money toward your down payment.A gift letter is a note from a donor to your lender regarding cash funds for your mortgage down payment. This guide explains how to document gift funds for a mortgage and meet lender requirements. 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 used for a mortgage is a formal statement that money is gifted for the down payment and is not a loan that must be repaid. Now that the gifter has handed, in the form of a check, a down payment gift to the buyer, the following steps are required. A gift letter used for a mortgage is a formal statement that money is gifted for the down payment and is not a loan that must be repaid. Close-up of gift details on form. The letter should include the exact dollar amount of the gift and the date of transfer.