Learn how to easily create your donation receipts and the best practices to follow in the year-end receipts to your donors. Include the nonprofit's EIN so the the donor can to check the charity's tax-exempt status with the IRS.Nonprofit organizations may qualify for exemption from some Florida taxes. Each tax is separate and distinct and has its own requirements. A tax exempt organization may need a letter to confirm its taxexempt status or to reflect a change in its name or address. What do you need to include in your donation acknowledgment letter? 501c3 Determination Letter Request.