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. 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. A short letter like this sample gift letter will cover all of the requirements your lender needs. 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. 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 gift letter template is actually very simple to write. This document provides detailed information on how to complete the Foundation Donation Form. Or, if you're mailing physical messages, how do you let supporters know they can find you online or send a check? Reach out with a letter.