In this post, I'm breaking down how to write a donation letter. 1. Print the template on letterhead.Should you choose to pledge your donation, please fill out the information below. To assist you in determining your eligibility to sign an Acknowledgment of Parentage, the following definitions are provided:. Fundraising Instructions. 7. Fundraising Sample Letter. 8. This document provides a sample format for a letter acknowledging an in-kind contribution or donation. We hope you will consider making a donation. Your Donation is greatly appreciated!