In many cases, charitable donations are tax-deductible. When you donate to a qualifying organization, you can deduct the amount from your taxable income.Enter the entity name and identifying number from the tax return where the noncash charitable contribution was originally reported, if different from above. A donor acknowledgement letter should include a few specific items to assist the donor and help your organization comply with IRS regulations. Form 990-PF - Provide a copy of the Form 990-PF. Learn how to get the biggest tax savings when making charitable contributions of cash or checks, household goods, cars or appreciated property. 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? Think of it as your nonprofit's social security number. Plan to carry out their charitable mission and a budget designed carry out the plan.