Toll Free Number: 1.888.4.GOODWILL. We've created this stepbystep guide on everything you need to know about creating a donation receipt letter for tax purposes.Tax laws require the donor to obtain a receipt for every cash donation regardless of the amount. A donation receipt documents the details of a cash or property donation that's gifted to an individual cause or organization. Here are some handy IRS tips for deducting charitable donations. When you bring items to one of our donation locations, you may fill out a paper donation form. We're making it easier than ever to trace your Goodwill donation receipts. With our donation tracker, you will no longer have to hold on to your paper receipt. You fill in a reasonable, fair-market value of the donation. Please follow IRS guidelines in completing the description of goods donated and the value of the goods donated.