Sell enough candles, edit enough wedding photos, or flip enough furniture, and eventually you hit a tax question with real money attached: is this a business or a hobby? The IRS cares about the answer because it controls your deductions, and in 2026 the gap between the two treatments is as wide as it has ever been. A business deducts its expenses. A hobby, under current law, deducts essentially nothing.
The dividing line is not a dollar amount, a number of sales, or whether you have an LLC. It is your profit motive: whether you are genuinely trying to make money. The IRS lays out the framework in its guidance on earning side income: hobby or business, and it comes down to a set of factors that look at how you actually run the activity. No single factor decides, and the IRS weighs them all together.
Why the label matters so much
Call it a business, and you report income and expenses on Schedule C. Supplies, mileage, platform fees, advertising, a workspace: legitimate costs come off the top, and only the net profit is taxed. If the business loses money in a year, that loss can generally offset your other income, like wages.
Call it a hobby, and the picture inverts. All the income is still taxable, reported as other income on Schedule 1, but since the 2017 tax law suspended miscellaneous itemized deductions, hobby expenses are not deductible against it. Someone with $4,000 of hobby sales and $3,500 of supply costs pays tax on the full $4,000. That asymmetry is why the classification fight is usually about activities that lose money or barely break even, and why the IRS pushes back on people who report a money-losing “business” year after year while enjoying it suspiciously much.
The factors the IRS actually weighs
The test asks how you behave, not what you call yourself. The core factors include: whether you carry on the activity in a businesslike manner, with complete books, records, and a separate bank account; whether the time and effort you put in show an intent to make it profitable; whether you depend on the income for your livelihood; whether losses are due to circumstances beyond your control or are normal startup losses in your field; whether you change methods to improve profitability; whether you or your advisers have the knowledge to run it as a successful business; whether you have made a profit in similar activities before; whether the activity makes a profit in some years and how much; and whether you can reasonably expect future profit, including from assets that appreciate.
Notice the theme: adjusting. A person with a real profit motive raises prices, cuts losing product lines, tries new sales channels, and keeps records tight enough to know which is which. A hobbyist keeps doing the enjoyable thing regardless of the results.
The three-of-five-years presumption
There is a helpful shortcut in the law. If your activity turns a profit in at least three of the last five tax years, the IRS generally presumes it is engaged in for profit (for horse breeding, showing, training, or racing, the window is two of seven years). The presumption puts the burden on the IRS to prove otherwise, which is a comfortable place to stand. It works in reverse as a caution flag too: string together years of losses with no profitable ones, and you should expect the hobby question to come up, and you will want those businesslike-behavior factors firmly on your side.
What a real profit motive looks like on paper
If you want business treatment, build the file that supports it. Open a separate checking account and run every dollar of the activity through it. Keep receipts and a simple ledger. Track your time. Write down your plan, even a one-pager: what you sell, what it costs, what you charge, and what you will change if it loses money. Get any licenses your state or city requires. Register a business name if you use one. None of these is individually required by the tax code, but together they are exactly the evidence the factors ask about, and they cost almost nothing to create as you go. Reconstructing them three years later during an audit is a much worse afternoon.
Do not forget the other side of the deal
Business status brings obligations along with deductions. Net self-employment earnings of $400 or more trigger self-employment tax, the Social Security and Medicare tax you pay on Schedule SE, on top of income tax. Profitable side businesses often need quarterly estimated tax payments as well. The upside is real too: self-employment earnings build your Social Security record, and business owners gain access to retirement options like SEP IRAs that hobbyists never touch.
The honest summary is this: if you are truly trying to make money, act like it, document it, and take the deductions the law gives you without apology. If you are truly doing it for love and the income is incidental, report the income and enjoy the craft. The trouble only starts when someone wants the tax treatment of one and the lifestyle of the other.
