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.Thank you for your donation and support! Check out our step-by-step guide. Get Started With Donorbox. Schedule A reports your itemized deductions, including charitable contributions. You must report the credit on Maryland Form 502, Form 505 or Form 515. Please complete and return this form with the donation check. Proof of charitable contributions refers to the substantiation that the Internal Revenue Service requires to claim a donation as a tax deduction. Enter your information to print your donation receipt.