What do you need to include in your donation acknowledgment letter? A gift acknowledgment letter weaves together your nonprofit's appreciation, engagement, and compliance efforts following a donor's generosity.A donor acknowledgement letter should include a few specific items to assist the donor and help your organization comply with IRS regulations. In-Kind Donation – Donation of Goods or Property. With a few exceptions, an organization is not responsible for providing the donor with an acknowledgment of his or her donation. Once you receive a donation of stock, a thank you and acknowledgment letter should be sent to the donor. Gifts to the University do not include sponsored project solicitations. Please fill out the form as completely as possible.