If you won an item and you paid more than its retail value, you may be entitled to a tax deduction for the amount you overpaid because the difference might be considered a donation in some states.
The Tax Deductible Service Gratuity Donation paid in addition to your winning bid is processed and paid back to the nonprofit Seller as a donation. So the amount paid over your winning bid MAY BE tax deductible, depending on the exemption status of the seller. For more information about the Service Gratuity Donation, please follow this link: https://winningcause.zendesk.com/hc/en-us/articles/209769268-What-s-a-Service-Gratuity-Donation-
We are not tax professionals, so please speak with a tax advisor for accurate and current information on tax deductions.