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.Please keep this written acknowledgement of your donation for your tax records. A donor acknowledgement letter should include a few specific items to assist the donor and help your organization comply with IRS regulations. Discover how to craft donor acknowledgment letters that resonate. Access templates and best practices for donor engagement. In this guide, we'll explore the ins and outs of donor recognition and discover how your organization can create an effective acknowledgment strategy. Want to learn how to write and structure donor acknowledgment letters? Check out these tips and sample letters to make a greater impact. Use one of these letters as a guideline or template to create your own mission trip fundraising letter.