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. 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 short letter like this sample gift letter will cover all of the requirements your lender needs. A gift letter is a document stating that any money received from family or friends is a cash gift and not a loan. 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. These letters provide documentation of a monetary gift from a family member or friend, which can serve as a gifted deposit.