A gift acknowledgment letter weaves together your nonprofit's appreciation, engagement, and compliance efforts following a donor's generosity. What do you need to include in your donation acknowledgment letter?Gift acknowledgement letters are important for two reasons. First, they provide proof so donors can claim a US tax exemption. Listed below are examples of how to acknowledge these gifts in a Thank You letter to your donor. Take a look at what makes a good thank you letter for a donation or use one of our provided templates to help get you started. A donor acknowledgement letter should include a few specific items to assist the donor and help your organization comply with IRS regulations. As a nonprofit, you know that the giving season cannot be ignored! Read for actionable tips on writing an effective end-of-year appeal.