What if I don’t receive a 1099-K from Amazon?
If you think you meet the above conditions but did not receive a 1099-K form from Amazon, and cannot find it on Seller Central, contact Seller Support.
If you made a profit on Amazon, you will need to report the income whether you received a 1099 or not. One exception is if you used Amazon to sell of a few household items for less than the original purchase price.
If your online auction sales are the Internet equivalent of an occasional garage or yard sale, you generally do not have to report the sales. In a garage sale, you generally sell household items you purchased over the years and used personally. If you paid more for the items than you sell them for, the sales are not reportable. Losses on personal use property are not deductible, either.
You can read more about how the IRS determines income tax requirements for online selling here.