What do you need to include in your donation acknowledgment letter? What information must the organization include in the written acknowledgement letter?Thank you for your contribution of __________________. The taking of an acknowledgment consists of positively identifying the signer of a document. My research on thank you letters culminated in a list of the 20 Characteristics of Great Thank You Letters which was published in DonorCentered Fundraising. A donor acknowledgement letter should include a few specific items to assist the donor and help your organization comply with IRS regulations. An example is: The Chicago-Northshore, Ill. Sometimes this is used to have one party agree to restrictions or obligations that are not set out in an original agreement. How to acknowledge payment received via email sample. Many of your donors are now in the process of preparing their 2014 tax returns.