Donation acknowledgment letters help communicate appreciation while giving donors necessary tax information. Complete and submit with your return Section A of IRS Form 8283.Your donation receipt can be a mailed thankyou letter or an emailed acknowledgment. Select a process that works best for your nonprofit. How to deduct your Goodwill donations on your taxes. See your tax return instructions. Non-cash donations also need supporting records. Habitat for Humanity International or our affiliates cannot assign a value to non-monetary gifts. It is up to the donor to determine the value for tax purposes. Standard 501 (c)(3) for donations.