The most important document required is a gift letter. A gift letter for a mortgage shows your lender that you don't need to repay gift money toward your down payment.Gift funds may not be contributed from any source that has an interest in the sale of the property (seller, builder, real estate agent, etc.). The gift donor may not be a person or entity with an interest in the sale of the property such as the seller, real estate agent, builder, or developer. The lender will need a "gift letter" from the donor to make sure your down payment help has no strings attached. Use our mortgage gift letter template and write yours. The gift giver may need to provide bank statements from where the funds originated. A gift letter is a document that certifies the funds you're receiving for your down payment are a gift, not a loan. If a relative or friend thinks of gifting a down payment, you'll be required a gift letter and bank statement.