This guide explains how to document gift funds for a mortgage and meet lender requirements. 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.Your parents will need to file the proper forms with IRS declaring the gift. So no potential consequences of gift tax. Yes, all lenders will require a gift letter. Although you may have the funds, the lender needs to confirm that you won't have to repay the gift. What should you include in a gift letter? The purpose of this letter is to document that the money does not need to be repaid as well as the donor's name, contract information, and relationship to you. Any gift funds, or gifts of equity, must be reflected on the Uniform Loan Application Form (Form 1003). Close-up of gift details on form.