The IRS taxes gifts made over a certain dollar amount. 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.Sign a gift letter: Donors must sign a gift letter that certifies the funds are a gift, not a loan. The general rule is that any gift is a taxable gift. However, there are many exceptions to this rule. Representatives are also available to assist taxpayers Monday - Friday, 8 a.m. A gift letter is a document that certifies the funds you're receiving for your down payment are a gift, not a loan. LendingTree does not include all lenders, savings products, or loan options available in the marketplace. How Does LendingTree Get Paid? If a promissory note is transferred as a gift, gift tax rules may apply, according to IRC Section 2501.