What do you need to include in your donation acknowledgment letter? Learn about the importance of preparing and distributing acknowledgement letters on a timely basis to donors at tax time - Warady Davis - Chicago CPA.In-kind donation acknowledgments, unsurprisingly, are sent out afterward, generally, once the donation has been received or the event it corresponds to is over. Donation acknowledgment letters are more than just a donor tax receipt. There are certain items to include for tax purposes. An official acknowledgment letter to the donor. We've created this stepbystep guide on everything you need to know about creating a donation receipt letter for tax purposes. If you wish to receive acknowledgment for your DAF gift or intend to use it for membership, kindly request the sponsoring organization to include your name. AIDS Foundation Chicago is a 501(c)3 tax-exempt organization and your donation is tax-deductible within the guidelines of U.S. law. Dress up Your Donation.