What do you need to include in your donation acknowledgment letter? We've created this stepbystep guide on everything you need to know about creating a donation receipt letter for tax purposes.For best results, write a personal acknowledgment letter with a receipt that includes the IRS-required elements. This step-by-step guide will help you fill out the donation tax receipt and get things in order for tax season. Here's what nonprofits need to know. "(Personalized Seal)" in the following examples means a seal containing the words "Notary Public, State of Texas" around a star of five points, the notary. A donation receipt summarizes the financial details of a contribution, such as the donor's name, amount paid, and transaction date. The U.S. federal government has a set of standards for what information must be included in a donor acknowledgment letter. I. Form for Ordinary Certificate of Acknowledgment.