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.What's on a Gift Letter? A short letter like this sample gift letter will cover all of the requirements your lender needs. Most lenders have a template for mortgage gift letters that you can download, fill out, sign and submit back to the lender. Fill Online, Printable, Fillable, Blank Gift Letter Template Form. Use Fill to complete blank online OTHERS pdf forms for free. 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. In any event, the donor(s) will have to fill out a form gift letter stating that the money is a gift and not a loan. The gift letter spells out who the donor is and how they know the borrower.