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. The goal of a gift letter is to provide the lender with proof of where the funds came from.Mortgage Gift letter is what the donor of the gift writes to the lender stating that he has offered a gift of money to the home buyer. 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. What should the gift letter include? A Gift Affidavit is a legal instrument designed to validate the gifting of an item from one individual (Donor) to another (Donee). The lender will need a "gift letter" from the donor to make sure your down payment help has no strings attached. If their gift is too large, they may have to fill out a gift tax form when filing returns. A gift letter is one of the most important legal documents to prove the asset is yours. Before you fill out the Loan Qualification Worksheet, find out the current industry numbers from a loan officer or mortgage broker.