What do you need to include in your donation acknowledgment letter? What is required in a donation acknowledgement letter?Sample Donor Acknowledgement Letter for NonCash Donation. Don't let your corporate contributors go unthanked -- be sure to acknowledge donations as they come in with this easy to use form with instructions. Sample – 501(c)(3) Donation Receipt. First paragraph: Immediately thank donors for their gift. On your fundraising materials and donor acknowledgement letters? • Most nonprofits must contact the Secretary of State each year. A solid donor recognition plan is critical to your nonprofit's fundraising strategy. Want to learn how to write and structure donor acknowledgment letters?