Selling on eBay, Etsy, and Poshmark: what's actually taxable

Online selling covers three totally different activities that people constantly mix up: clearing out your own closet, reselling things you bought to flip, and making things to sell. Each has different tax treatment. The seller who understands the differences pays tax only on real profit; the one who doesn't either overpays on money that was never income or underreports and meets the IRS matching computer.

Selling your own used stuff: usually not taxable at all

Sell your old couch for $200 when you paid $900? That's a personal item sold at a loss — no taxable income, because you didn't make money, you recovered part of what you spent. Most closet-cleaning falls here. The catches: losses on personal items aren't deductible (you can't use the couch 'loss' against other income), and if a personal item sells for more than you paid — vintage jacket, sports cards, that ugly lamp that turned out to be mid-century — the gain IS taxable, as a capital gain.

Reselling for profit: a business with inventory

Thrift flipping, retail arbitrage, sneaker resale — buying things in order to sell them makes you a business, and your profit (not your sales) is taxable on Schedule C, subject to income and self-employment tax. The key concept is cost of goods sold: what you paid for the items you sold this year comes off the top, along with fees, shipping, and supplies.

Makers: your materials and tools count too

Etsy sellers and crafters are businesses like resellers, but their cost of goods is materials plus direct costs of production. Deductions typically include materials, tools and equipment, platform listing and transaction fees, packaging, shipping labels, a workspace share if you qualify for the home office deduction, and craft fair booth fees. If your operation is small and persistently unprofitable, revisit the hobby-versus-business rules — but a genuine attempt to profit belongs on Schedule C.

The record-keeping that makes it all easy

1. Keep a purchase log for everything you buy to resell or use as materials: date, item, cost, source. Photograph receipts.
2. Download each platform's sales and fee reports monthly — they disappear if your account closes.
3. Track shipping costs you pay separately from shipping buyers reimburse.
4. For personal items you're selling off, note what you originally paid when you can — even an estimate beats nothing.
5. Run all of it through a dedicated bank account or payment profile so the year adds itself up.

The bottom line

Three activities, three treatments: personal stuff at a loss is tax-free (but losses don't deduct), flipping is a business taxed on profit after cost of goods, and making is a business with materials and fees to deduct. The universal rule is documentation — what you paid for things is the difference between being taxed on your profit and being taxed on your revenue.

A worked example: three sellers, three different tax stories

Meet three people who each moved $5,000 of goods online in 2025. The first cleaned out her garage, selling old furniture and electronics she originally paid $9,000 for — every item sold at a loss, so she owes nothing, though she cannot deduct the losses either. The second is a collector who bought a guitar for $1,500 years ago and sold it for $5,000; his $3,500 gain is taxable as a capital gain on personal property. The third sources clearance goods and resells them for a living, netting $1,800 of profit after $3,200 of inventory and fees; she owes both income tax and self-employment tax on the $1,800. Same gross, wildly different returns — the difference is entirely in intent and records.

Records that settle every question

Nearly every online-selling tax problem reduces to one missing fact: what did you pay for the thing? Basis records turn frightening 1099-K gross numbers into small, defensible profit figures. Build the habit before the platform builds the paperwork for you.

• Photograph or save receipts for anything you might resell, including screenshots of original online orders.
• For garage-sale-style cleanouts, a dated inventory list with honest estimated original costs beats nothing by miles.
• Track platform fees, shipping labels, and packaging separately — resellers deduct all of them.
• Keep personal cleanouts and resale inventory in different platform accounts if you do both.
• Note acquisition dates, since holding periods decide short- versus long-term gain treatment on appreciated items.

The threshold chaos of recent years — federal rules bouncing between $600 and $20,000 before settling back high, while some states kept low triggers — changed only who receives forms, never who owes tax. Sell like a business and file like one; sell your own used things at a loss and simply be ready to show that is what happened.