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. List all reportable gifts made during the calendar year on one Form 709.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. 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 about how to obtain an extension for filing an inheritance tax return, filing fees, and where and when to file and pay the tax. Your eligibility income is different from your taxable income. Form 4506T has multiple uses and special attention must be taken when completing the form for a gift tax inquiry. You must report any. So, yes, I think the taxes should go up partially," he said. "But not that outrageous amount.