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 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.From obtaining gift funds to filling out a gift letter, everything you need to know about mortgage gifts for a home purchase in Florida. So what's the gift letter? This gift is to be applied toward the purchase of the property located at: (Property Address). 3). All gifts must be paper-trailed and digitally documented with cancelled checks and bank statements. A gift letter for a mortgage shows your lender that you don't need to repay gift money toward your down payment. A gift letter is a document that certifies the funds you're receiving for your down payment are a gift, not a loan.