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.A donor acknowledgement letter should include a few specific items to assist the donor and help your organization comply with IRS regulations. In this guide, we'll explore the ins and outs of donor recognition and discover how your organization can create an effective acknowledgment strategy. Thank you for your continuing support of. PTA. Want to learn how to write and structure donor acknowledgment letters? Check out these tips and sample letters to make a greater impact. An inkind donation is a nonfinancial donation, typically of goods or services. An inkind donation is a nonfinancial donation, typically of goods or services. Donors must have a bank record or written acknowledgment from the nonprofit before claiming a tax deduction for a charitable contribution.