They are legally binding — While giving a family member a financial gift may not feel like a big deal to some people, gift letters are not only a formality. They are a legally binding document that both parties must sign.
5 A gift can be rescinded if it was induced by fraud or material misrepresentation (whether of the donee or a third person) or by mistake as to a "basic fact." (Rest., Restitution, §§ 26, 39; see Murdock v. Murdock (1920), 49 Cal.
Use Form 709 to report: Transfers subject to the federal gift and certain generation-skipping transfer (GST) taxes.
In general, a gift letter should include details about the donor, the recipient, the amount of the gift, and the purpose of the gift. It's also important to note that gift letters should be signed and dated by both the donor and the recipient.
Who Must File. In general. If you are a citizen or resident of the United States, you must file a gift tax return (whether or not any tax is ultimately due) in the following situations. If you gave gifts to someone in 2024 totaling more than $18,000 (other than to your spouse), you probably must file Form 709.
You cannot e-file Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return. The Instructions for Form 709 direct you to mail it to the applicable address listed below.