We've created this stepbystep guide on everything you need to know about creating a donation receipt letter for tax purposes. If you donated to a nonprofit at one of our locations, you are able to access an electronic copy of our nonprofit partners' tax receipt below.An official tax receipt will be mailed to the person making the donation. Simply download and fill out this form and return it to the school office or mail it in with your payment. It's even easier to donate online. Mail-in Donation Form. Please print this form, fill out and mail to: ATTN: Development. Please fill out and return this form with your donation. Support autism education, awareness, advocacy, research, and assistance to austism families through tax deductible donations and other charitable venues. If you qualify, you can write a check or use your credit card to contribute up to the limit under the law.