Determine the item's fair market value (FMV). By law, Goodwill Industries of Southern Arizona cannot tell you the value.A donation receipt is needed as proof of your donation for tax deduction purposes. Donation receipts are important! Here's how to create donation receipts your donors (and the IRS) will love. When completing your taxes, fill out Arizona Form 321 to claim your tax credit. Learn what to include in your donation tax receipts and how to leverage them for compelling nonprofit storytelling. Enter all required fields below and a receipt will be emailed to you within 15 business days. All items donated to NCCF are tax deductible. For information or help, call one of the numbers listed: Phoenix.