Sample Donor Acknowledgement Letter for Cash Donation. What do you need to include in your donation acknowledgment letter?GENERAL INFORMATION: Use this form to claim property tax exemptions pursuant to Tax Code Section 11.18 for property owned on Jan. Are pleased to inform you that upon review of your application for tax exempt status we have determined that you are exempt from Federal income tax. Learn how to easily create your donation receipts and the best practices to follow in the year-end receipts to your donors. Complete list of Texas Comptroller Property Tax Forms and Applications click here. Texas Comptroller Property Tax Publications click here. Donation acknowledgment letters are more than just a donor tax receipt. There are certain items to include for tax purposes. Eligible Gift Transfers.