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. Take a look at what makes a good thank you letter for a donation or use one of our provided templates to help get you started. The letter serves as a thank you and required written acknowledgment, and should include specific language from the downloadable template 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 Salvation Army does not set a valuation on your donation. (Been audited 3 times—won 2 lost 1—not a bad record). And as others have said the NFP's have to keep tabs on who donates what and how much.