A gift acknowledgment letter weaves together your nonprofit's appreciation, engagement, and compliance efforts following a donor's generosity. Include the nonprofit's EIN so the the donor can to check the charity's tax-exempt status with the IRS.First paragraph: Immediately thank donors for their gift. Thank you for your continuing support of. PTA. What do you need to include in your donation acknowledgment letter? A good donor acknowledgment letter is both a transaction record and a donor engagement opportunity. Here's how to write one. For our organization and brand, it's more personable. Have standard donor acknowledgment letters at the ready, and make it easy to fill in the donor and contribution information. A donor acknowledgement letter should include a few specific items to assist the donor and help your organization comply with IRS regulations.