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. Learn how to create a mortgage gift letter template to ensure a smooth homebuying process with your gifted funds with 6 samples.The goal of a gift letter is to provide the lender with proof of where the funds came from. A gift letter is an important, formal, legal piece of documentation that can help explain that a (usually rather large) sum of money was gifted to you. 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. All funds needed to complete the transaction can come from a gift. A mortgage gift letter is a document that helps satisfy the requirement that a borrower's down payment funds come from legitimate sources.