Hobby or Business? The Factors the IRS Actually Weighs

For an online seller, the label "hobby" or "business" is not just wording. It changes the math in two concrete ways. A business reports on Schedule C, deducts the cost of inventory and selling expenses against its income, and pays self-employment tax on the net profit. A hobby reports the income too, and the cost of the goods sold still reduces hobby gross income, but other hobby expenses have not been deductible since 2018, and a hobby owes no self-employment tax. Getting the classification right, and being able to defend it, matters in both directions.

One situation sits outside both labels: selling your own used belongings, things you bought for personal use. That is neither a hobby nor a business. A personal item sold for less than you paid is a loss that is not deductible but leaves no tax to pay, and one sold for more than you paid is a capital gain. The guide to personal items sold at a loss covers how to report those sales. The rest of this page is about telling a hobby from a business.

There is no single test

The IRS does not use one bright line. It weighs a set of factors together, asking, in effect, whether you are genuinely trying to make a profit or whether the activity is really for recreation with some income on the side. No single factor decides it, and you do not need every factor to point the same way. What follows is how those factors read in the specific world of reselling.

The factors, in reseller terms

Do you run it in a businesslike way? Keeping records of what you paid and what you sold, using separate accounts, tracking inventory, and having any kind of system all point toward a business. A shoebox of receipts you never open points the other way.

Does your effort suggest a profit motive? Time spent sourcing, listing, photographing, and shipping regularly looks like work. Occasional listing when you feel like it looks like a hobby.

Do you depend on the income, and do you actually profit? Earning a real, repeated profit is strong evidence of a business. So is relying on the income. A string of years with losses and no plan to change course leans toward hobby, though startups are expected to lose money early.

Do you have expertise, and do you adapt? Learning your category, studying what sells, and changing tactics to improve results are businesslike. Buying and listing with no attempt to get better is not.

Is there an expectation that assets appreciate? This matters more for collectors: if you hold items expecting their value to rise, that can support a profit motive even during lean selling years.

What is your history and pattern? A track record of turning activities profitable, and occasional profits within this one, support business treatment. Consistent losses with personal enjoyment as the main return support hobby treatment.

The practical reseller reality

Sourcing inventory specifically to resell it, listing regularly, and keeping records are the patterns the factors above treat as businesslike. The two labels carry a trade-off: a business deducts fees, shipping, and supplies but owes self-employment tax on its profit, while a hobby subtracts only the cost of the goods it sold and owes no self-employment tax. The label is not picked for whichever costs less; it follows from the facts, weighed through the factors. Clearing out your own closet is a separate case again: those are personal items, covered at the top of this page.

Why it feels like it changed

Two things changed for small sellers in recent years. Starting with 2018 returns, hobby expenses other than the cost of goods sold stopped being deductible, and the One Big Beautiful Bill Act made that permanent, which made the hobby label more costly. And small sellers became far more visible: the lower 1099-K level for 2024 ($5,000 under IRS transition relief), and the general growth of reselling apps, meant far more people received forms and had to think about this classification for the first time. If the question is new to you, it is most likely because the paperwork reached you. The threshold guide covers that story.

Putting it together

Decide honestly which side you are on, keep records either way, and use the checker on the home page to see how the classification changes your estimated self-employment tax. If your situation is close to the line, or the numbers are large, that is exactly when a short conversation with a tax professional pays for itself.

This article is general information, not tax advice. The hobby-versus-business determination depends on your full facts; confirm with the IRS or a tax professional.