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. The person who gave you the money must write and sign the gift letter as well as provide their personal information.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. How to write a gift letter. Below is a template for a gift letter, useful when family or friends want to help you with a loan downpayment. A gift letter is a note from a donor to your lender regarding cash funds for your mortgage down payment. Learn about gift letter requirements What if I get paid in cash? Fill out income documentation form.