In this post, I'm breaking down how to write a donation letter. Let's walk through common examples of donation letters, starting with a template of the basic format to follow.Donorbox online donation forms are the perfect tool to drive more donations online. Accept one-time and recurring donations with Donorbox. 4, Thank you for your donation. Enter the entity name and identifying number from the tax return where the noncash charitable contribution was originally reported, if different from above. Enter the entity name and identifying number from the tax return where the noncash charitable contribution was originally reported, if different from above. 1. Print the template on letterhead. Then, write a tailored letter to that supporter just like you would for a significant monetary donation. Sponsorships are a great way to form partnerships with others for consistent support.