A gift letter must contain the donor's name, the gift's value, confirmation that the gift is not to be repaid, and the donor's signature. Purchase Price and Purchase Date—The purchase price or the word "Gift"or "Trade" must be indicated.Needed to put together a gift letter, basically a Bill of Sale with all the information about what is being gifted. 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.