A short letter like this sample gift letter will cover all of the requirements your lender needs. The gift letter provides assurance to the lender that the down payment is not a loan or a form of undisclosed debt.Lender's authorized representative must fill out and execute the Down Payment Assistance Funding. From obtaining gift funds to filling out a gift letter, everything you need to know about mortgage gifts for a home purchase in Florida. A gift letter for a mortgage shows your lender that you don't need to repay gift money toward your down payment. Compare the Top Down Payment Assistance Programs and First Time Home Buyer Special Mortgage Financing Available in Florida.