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.Donation acknowledgment letters are more than just a donor tax receipt. There are certain items to include for tax purposes. Want to learn how to write and structure donor acknowledgment letters? Check out these tips and sample letters to make a greater impact. The person completing the application for a Special Event license as defined above must be associated with the nonprofit applicant identified in section 4. 5. ✓ Fill out the application available in the Career Center on the 2nd floor. ✓ Recommendation letter from your mathematics teacher is required.