What do you need to include in your donation acknowledgment letter? Many online donor platforms cannot distinguish NV-based donors until transactions are complete.A donor acknowledgement letter should include a few specific items to assist the donor and help your organization comply with IRS regulations. Please ensure that you select the correct receipt for the nonprofit at the location with which you donated. DonorPerfect helps you stay on top of receipting all year long, avoiding clerical errors and making tax time hassle-free. Include the nonprofit's EIN so the the donor can to check the charity's tax-exempt status with the IRS. There is no official IRS form that the exempt organization has to complete. When does the nonprofit need to send the written acknowledgment letter to donors? Please take a few minutes to fill out a brief survey, available in English and Spanish. All cash gifts will be mailed a thank you letter and tax acknowledgement after receipt.