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. This Court supervises the assets and liabilities of people who die while they are residents of California or who leave property inside this County.Your parents will need to file the proper forms with IRS declaring the gift. So no potential consequences of gift tax. 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. Official Forms for Viewing and Downloading.