Fill out your contact information and the details of your gift below. Once your gift is verified, we'll send your letter to the address you listed below.Have standard donor acknowledgment letters at the ready, and make it easy to fill in the donor and contribution information. A good donor acknowledgment letter is both a transaction record and a donor engagement opportunity. Here's how to write one. What do you need to include in your donation acknowledgment letter? Remember to include gift details, such as gift date and gift amount, in your acknowledgment letter to the donor. 3. Donation acknowledgment letters are more than just a donor tax receipt. There are certain items to include for tax purposes. Donation requests are usually filled within 30 days of the event date whenever possible.