Income from selling personal items is generally not taxable unless you sell the item for more than you originally paid for it.
Tax Treatment:
When you sell a personal item (such as furniture, a refrigerator, jewelry, or concert tickets), you need to compare the sales price to your original purchase price. If you sell the item for less than what you paid, you have a loss, which is not deductible. However, if you sell the item for more than you paid, you have a taxable gain that must be reported [1].
For example, if you bought concert tickets for $500 and sold them for $900, you have a $400 taxable gain. Conversely, if you bought a refrigerator for $1,000 and sold it for $700, you have a $300 loss that cannot be deducted [1].
Reporting Requirements:
Any gain on the sale of a personal item must be reported on Form 8949, Sales and Other Dispositions of Capital Assets, and Schedule D, Capital Gains and Losses. If you received a Form 1099-K for the sale but sold the item at a loss, you should enter the amount from the 1099-K in the entry space at the top of Schedule 1 [1].