What do you need to include in your donation acknowledgment letter? Bystep guide on how to fill out a Goodwill tax donation receipt.This form is available at our stores in Maine, New Hampshire and Vermont. Donation acknowledgment letters are more than just a donor tax receipt. There are certain items to include for tax purposes. There are many other reasons to send a receipt after receiving a donation. Master donation receipts fast with our tips, free templates and messaging samples. Donation Receipt Template Instructions and Guidelines. This file provides comprehensive instructions on how to fill out and use donation receipt templates. How to Generate a Donation Receipt for Tax Abiding?