What do you need to include in your donation acknowledgment letter? Include the nonprofit's EIN so the the donor can to check the charity's tax-exempt status with the IRS.We've created this stepbystep guide on everything you need to know about creating a donation receipt letter for tax purposes. When acknowledging these donations, include the name of the donor, the number of shares, the name of the security, and the date when the transfer was completed. The letter serves as a thank you and required written acknowledgment, and should include specific language from the downloadable template for tax purposes. Follow a stepbystep process on how to create a 501(c)(3) charity donation receipt which is taxcompliant. A donation acknowledgment letter (sometimes called a donation receipt or thankyou letter) is an email or paper that recognizes a charitable contribution. The initial donation receipt or the thank-you letter you receive once the donation process is complete). It serves the dual purpose of being a receipt for received items and a means of public relations. Dottie had received in the past a letter from Rochester General Hospital asking for donated books for the hospital.