A gift letter for a mortgage is a document that confirms that a financial gift has been given to a borrower to help them with the down payment or closing costs. You can use gifted funds to make a down payment, but your mortgage lender will want to know some details before they allow you to use it.When someone offers to help you make a down payment on a house, your lender will require a gift letter for a mortgage. Here's what it includes. This receipt is issued to individuals who have donated cash or payment, personal property, or a vehicle and seek to claim the donation as a tax deduction. A short letter like this sample gift letter will cover all of the requirements your lender needs. Try our free donation request letter templates! Download our standard template or check out our example letters for events, auctions, schools, and more. Check out our templates to help you get started. The best way to clear up these questions is with a down payment gift letter.