Your answers point to something the IRS treats as a real business: consistent effort, real costs, and a profit motive. That flips you from casual seller into Schedule C territory. The good news: business treatment almost always costs you less in tax — as long as you track.
You file your reselling on Schedule C, deduct ordinary and necessary expenses, and pay self-employment tax on the profit. Done right, business treatment saves most resellers hundreds to thousands versus hobby treatment — but only if you're actually tracking your numbers.
The IRS doesn't care whether you call yourself a business, have an LLC, or printed business cards. What matters is whether you run your reselling like a business: with a profit motive, consistent effort, real record-keeping, and something that looks like a plan. Those signals are laid out in Treas. Reg. § 1.183-2(b) — nine factors the IRS uses to separate hobbies from businesses.
If your activity qualifies, you're a sole proprietor by default. You report income and expenses on Schedule C (attached to your Form 1040), and you pay self-employment tax on the net profit via Schedule SE. You do not need an LLC, an S-corp, or an EIN to do this. A sole prop is the simplest legal form, and it's what the vast majority of resellers file as.
The whole point of business treatment is that you only pay tax on profit, not gross sales. That's a huge deal. Watch what happens with the same activity treated two different ways.
You sold $10,000 on eBay this year. COGS: $6,000. eBay fees: $800. Shipping labels: $400. That leaves a net profit of $2,800.
As a business: you owe tax on $2,800. Self-employment tax of roughly 15.3% = ~$420. Add federal income tax at a 12% bracket = ~$340. Total: ~$760.
As a hobby: you'd owe tax on the full $10,000 of gross income, with no deductions allowed. At a 12% bracket, that's roughly $1,500+ — nearly double, for the same activity.
That spread is why getting your classification right — and tracking the inputs that support it — is probably the highest-leverage tax move a reseller can make. Numbers above are illustrative and don't include state tax or your specific bracket. Your CPA can run the real math.
Schedule C asks for specific categories. If you're not capturing them, you're leaving deductions on the table. Here's the working checklist:
You also want to be aware of quarterly estimated taxes. If you expect to owe $1,000 or more in tax for the year, the IRS wants you paying in four times (April, June, September, January) via Form 1040-ES. Skip them and you'll pay an underpayment penalty — small, but avoidable.
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Retake the quiz →First-year resellers can absolutely file as a business — the IRS doesn't require a multi-year track record. What they expect to see is a profit motive: evidence you're trying to make money, not just clearing out a closet. A first-year loss is fine and common.
One practical note: if you claim losses three or more years out of five, the IRS may ask you to prove you're really in it for profit. Keep documentation from day one — a simple one-page plan, your tracking, your sourcing strategy. That's your defense.
No. By default you're a sole proprietor, which means you file Schedule C attached to your regular Form 1040. No LLC, no EIN, no state registration needed for federal tax purposes.
An LLC gives you liability protection (useful if you're dealing with high-value items or employees), but it doesn't change your federal tax treatment unless you elect S-corp status. For most resellers under $50K in profit, a sole prop is simpler and cheaper.
The core set for a reseller filing as a business:
You'll receive a 1099-K from each platform that paid you above the reporting threshold. You don't file it — you reconcile it.
The IRS standard is "ordinary and necessary" for your trade. For reselling, that's a pretty wide net: COGS, shipping supplies, platform fees, mileage to sourcing, storage, software subscriptions, business cards, booth fees at shows, a portion of your phone if it's mixed-use, and home office if you qualify.
Things that are not deductible: clothes you wear day-to-day, meals while you're sourcing alone, items you kept for personal use, and the cost of your regular commute to a non-reselling day job.
Each platform (eBay, Mercari, Poshmark, etc.) sends a 1099-K listing the gross payments processed for you. That number typically includes: sales, shipping you collected, and in some cases sales tax the platform remitted on your behalf.
Your job is to reconcile: tie the 1099-K total back to the sales in your books, then report the real gross revenue on Schedule C Line 1 and claim the appropriate deductions (fees, shipping, returns, sales tax collected if it was included). If the IRS sees a 1099-K for $15,000 and you report $11,000 in sales without explanation, you're going to get a letter.