Form 1099-K reports gross payments received through payment apps and online marketplaces, rather than a seller's profit or taxable income. For tax year 2026, platforms such as Cash App, eBay, Etsy, PayPal and Venmo generally must issue the form only when a user receives more than $20,000 and completes more than 200 transactions on one platform. Both conditions apply, although platforms may issue forms below the threshold. Personal items sold at a loss, such as a couch bought for $1,400 and sold for $300, are not taxable, but the loss cannot be deducted. Personal items sold for a gain are taxable after expenses, while business or side-hustle sales are taxable with potentially deductible related expenses. Sellers should preserve receipts, statements and order histories, maintain a transaction log, and address any inaccurate form with the issuing platform. The material is general information, not tax advice, and a qualified preparer can confirm the correct reporting treatment.