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. Hi, I'm new to this but need advice.My parents have given me and my brother a substantial cash gift. 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. Download a gift affidavit form in PDF or Word format to attest to and record the gratuitous and voluntary transfer of a gift. 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. 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. Learn more about the ASPCA's work to rescue animals from abuse, pass humane laws and share resources with shelters nationwide. Join our fight today! A gift, if valid, is a legally enforceable transfer under general contract law.