1099-K, hobby vs business, and self-employment tax: how it fits together
Every online seller eventually runs into the same three questions, usually in a panic in late January when a tax form shows up, or fails to. Will I get a 1099-K? Does that mean I owe tax? And is what I am doing even a business in the eyes of the IRS? These are three separate questions that get tangled together, and answering them in the wrong order causes most of the confusion. This page untangles them, and the checker above applies the current rules to your own numbers.
What a Form 1099-K actually is
A Form 1099-K is an information return. A marketplace or payment app, such as eBay, Poshmark, Mercari, Etsy, or PayPal, files it with the IRS to report the gross payments it processed for you during the year, and sends you a copy. The key word is information. The form does not calculate anything you owe, it does not subtract your costs, and it does not decide whether your income is taxable. It simply tells the IRS a number: the total that flowed through that platform to you. Because it is gross, the figure on a 1099-K is almost always larger than your actual profit, sometimes dramatically so, since it includes the buyer's shipping, the platform's fees, and the cost you originally paid for the items. Whether sales tax the platform collected is included varies by platform (eBay, for one, excludes it), so check your platform's statement.
The threshold, and why it kept moving
Whether a platform must send you a 1099-K depends on a reporting threshold, and that threshold has been a moving target. For years the rule was simple: a form was required only if you were over $20,000 in gross payments and more than 200 transactions on a single platform. The American Rescue Plan Act of 2021 slashed that to a flat $600 with no transaction minimum, a change that would have pulled vast numbers of casual sellers into reporting. The IRS, facing a flood of forms and confused taxpayers, delayed the change repeatedly through transition relief: the old $20,000-and-200 rule held for 2022 and 2023, and a middle figure of $5,000 with no transaction count applied for 2024. These thresholds are for payment apps and online marketplaces; card payments you accept through a payment card processor have no minimum, so any amount can produce a 1099-K.
Then, in July 2025, the One Big Beautiful Bill Act settled the question. It repealed the $600 rule outright and restored the original standard: over $20,000 in gross payments AND more than 200 transactions. The IRS reads it as retroactive, as if the $600 change never took effect. Forms for 2024 had already gone out at the $5,000 transition level, so the checker still shows that level for 2024. The correct answer genuinely depends on the year, so the checker asks which year your sales fall in, and content written before mid-2025 is now wrong. The threshold table in the checker above carries a verified date so you can see how current it is.
One more wrinkle: some states set their own, lower thresholds. A handful require a platform to issue a 1099-K at a few hundred or a couple of thousand dollars, well under the federal figure, so residents of those states can receive a form even while under the federal line. The checker reports the federal rule only and says so in the note under the checker; your state tax authority has the specifics.
A form is not the same as a tax bill
Here is the single most important point on this page: getting a 1099-K, or not getting one, has nothing to do with whether you owe tax. Income from selling is taxable whether or not any form is issued. If you buy items to resell and sell them for more than you paid, that profit is taxable income even if your totals are far below every threshold. Conversely, receiving a 1099-K does not mean you owe tax on the whole figure. What comes off the gross depends on your situation: a business subtracts what the items cost and its selling expenses, such as fees and shipping; a hobby subtracts only the cost of the items it sold; and personal items sold for less than you paid leave nothing taxable. The threshold decides paperwork; your income, figured under the rules for your situation, decides tax.
Personal items, hobby, or business: the distinction that changes the math
Once you know income is in play, the next question is how it is taxed, and that depends on which of three situations your sales fall into.
Personal items you used. Selling your own belongings, things you bought for personal use such as furniture, a phone, or clothes, is neither a hobby nor a business. An item sold for less than you paid is a personal loss: it is not deductible, but it leaves no tax to pay, and you account for the 1099-K amount so the taxable result is zero (for 2024 and later returns, in the entry space at the top of Schedule 1). An item sold for more than you paid is a taxable gain, reported on Form 8949 and Schedule D. The same goes for items from a collection you keep as a hobby: a gain is a capital gain, and a loss cannot be deducted.
A hobby. An activity you pursue because you enjoy it, with no intention of making a profit, that still brings in some income. Hobby income is reported and taxable. The cost of the goods you sold still reduces hobby gross income, but other hobby expenses, such as platform fees, have not been deductible since 2018. Hobby income carries no self-employment tax.
A business. An activity you carry on regularly with the intent to make a profit. You report it on Schedule C, you deduct the cost of your inventory and your selling expenses, such as fees, shipping, and supplies, and you pay self-employment tax on the net profit.
Between hobby and business there is a trade-off: a business deducts its selling expenses but owes self-employment tax, while a hobby subtracts only the cost of the goods sold and owes no self-employment tax. Which one applies is not a choice made on which costs less. It depends on the facts of how you run the activity, weighed through the factors the IRS uses, which the companion guide walks through. The checker lets you set business or hobby and shows how the answer changes; for your own used belongings, the guide to personal items sold at a loss covers the reporting.
The self-employment tax estimate
If your selling is a business, self-employment tax is often the larger surprise, because it is separate from and on top of income tax. It funds Social Security and Medicare, the share an employer would normally split with you, and it runs 15.3 percent: 12.4 percent for Social Security on earnings up to an annual wage base, plus 2.9 percent for Medicare with no cap. It is charged on 92.35 percent of your net profit, and only once net earnings reach $400. The estimate above applies the wage base for the year you pick. Treat it as a planning figure for one specific tax; it is not your total tax bill, and it is not a substitute for advice on your own situation.