The letter must explain who is gifting the money, where the donor's funds are coming from and the relationship between the donor and the recipient. There is no maximum amount of gift funds that can be used on a primary residence.Is there a limit on how much down payment gift funds you can receive? Mortgage Gift Letter Regulations By Property Type​​ There are no limits on the amount of gift money you can use for a down payment. A gift letter for a mortgage is proof to the lender that money you've been given for your home purchase is a gift, not a loan to be repaid. Yes, your gift letter needs to be notarized. Also, both the donor needs to sign it to make it valid. For instance, the withdrawal and deposit slips trace the flow of funds, while the gift letter asserts the nature of the transaction. To use gift funds, you must provide a gift letter proving the money is not a loan. How much money you're eligible to receive as a down payment gift depends on the type of mortgage you're borrowing.