Your gift letter has to be backed up with paperwork. This gift is to be applied toward the purchase of the property located at: (Property Address). 3).Learn how to use gift funds for a down payment and help your clients overcome financial hurdles on their path to homeownership. A gift letter is a note from a donor to your lender regarding cash funds for your mortgage down payment. Once we receive the application, we will work with you to complete the application. Emergency Financial Assistance.