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.We'll also show you how to write a gift letter with a gift letter template so you can help your donor prepare for underwriting. A gift letter is a note from a donor to your lender regarding cash funds for your mortgage down payment. How Do I Write a Gift Letter? 4. Intent: The letter should make it clear that the gift is being given without any expectation of repayment.