The gift tax is the responsibility of the eligible person receiving the motor vehicle. 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.Form 4506T has multiple uses and special attention must be taken when completing the form for a gift tax inquiry. All vehicle registration and title transfers require proof of insurance and a current vehicle inspection that is no more than 90 days old. 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. Who is responsible for this tax? A person who purchases a motor vehicle in Texas owes motor vehicle sales tax.