Maya sells handmade pottery at the Saturday farmers market. Last year she brought in $9,000 and spent $6,000 on clay, kiln time, and booth fees. Her friend told her to call it a hobby so she can skip the self-employment tax. Her friend is half right, and the half that is wrong will cost Maya more than the tax it avoids.
Is hobby income subject to self-employment tax? The short answer
No. That part is settled. TaxAct's breakdown of the rules is direct: hobby revenue is subject to income tax, but hobbyists do not pay self-employment tax, and hobby income gets reported on Form 1040, Schedule 1, line 8, as Other Income rather than on Schedule C. The Schedule SE reference tables used by tax professionals list it plainly: hobby income, not subject to SE tax.
Here is the half her friend missed. Since the 2017 Tax Cuts and Jobs Act, hobby expenses are not deductible at all. As a business, Maya's $6,000 of expenses comes off her revenue and she pays income tax plus SE tax on the $3,000 profit. As a hobbyist, she pays income tax on the full $9,000 and deducts nothing. The SE tax she dodged is the smaller number. That is the trap in one sentence: hobby status removes the tax and removes the deductions, and the deductions were worth more.
The $9,000 pottery math: why hobby status usually costs more
Let us do Maya's actual math. As a business: $9,000 minus $6,000 leaves $3,000 profit. Self-employment tax applies to 92.35% of that, so $2,770.50 times 15.3% is about $424.
Income tax at a 22% bracket on the $3,000 profit is $660, bringing the total to roughly $1,084. As a hobby: no SE tax, but income tax at 22% on the full $9,000 is $1,980. Same pottery, same market, $896 more in tax, because the expenses vanished. The friend's advice saved $424 and cost $1,320.
This is why the classification fight runs the other direction in practice. Taxpayers usually want business status to keep their deductions; the IRS is the one arguing something is a hobby, because hobby classification kills the deductions. LegalClarity's IRC 1402 walkthrough puts it well: if the IRS reclassifies your activity as a hobby, the income is still taxable as ordinary income, it just escapes SE tax, and you lose the ability to deduct business expenses. People picture the IRS chasing hobbyists for SE tax. The real audit story is the IRS telling a losing side hustle it is a hobby.
How the IRS decides hobby vs business
It weighs factors: whether you keep accurate books, how much time and effort you put in, whether you depend on the income for your livelihood, whether you have changed methods to improve profitability, and whether the activity has produced profits in some years. No single factor is decisive. A money-losing pottery booth with a business plan, separate bank account, and pricing that covers costs looks like a business having a bad year. The same booth run casually for a decade with no records and prices set by feel looks like a hobby.
Two mechanics worth knowing. First, the profit presumption: if the activity was profitable in three of the last five years, the IRS presumes it is a business, and the burden shifts. Most real side businesses clear this without thinking about it. Second, Form 5213: if you are under audit for hobby-loss disallowance, you can elect to postpone the IRS's determination of profit motive until the fourth year of the activity (the sixth for horse-related activities), giving a young business time to prove itself. Do not file it casually; it extends the statute of limitations on those years too, which is the part nobody mentions until it matters.
One more wrinkle people miss: hobby income still counts for estimated tax. No SE tax does not mean no tax bill in April, and a $9,000 hobby with no withholding can trigger an underpayment penalty if you ignore it all year. The safe harbor rules work the same whether the income came from a business or a pastime. Run the estimated numbers either way.
The decision tree is short. If you run the activity like a business, claim it as a business, deduct the expenses, and pay the SE tax on the profit, which is almost always the cheaper total. If it genuinely is a pastime that happens to make money, report the income on Schedule 1 and pay income tax only, but understand you bought that SE tax exemption with your deductions. And if someone tells you hobby status is a tax hack, run Maya's numbers for them. The $424 looks like a win until you see the $1,980.
Frequently asked questions
Do I pay self-employment tax on hobby income?
No. Hobby income is reported on Form 1040, Schedule 1, line 8 as Other Income. Income tax applies, but self-employment tax does not. The Schedule SE reference tables used by tax professionals list hobby income as not subject to SE tax.
Can I deduct expenses against hobby income?
Not since the 2017 Tax Cuts and Jobs Act. Before 2018, hobbyists could deduct expenses up to the amount of hobby income; that deduction was suspended and remains unavailable. This is why hobby status usually costs more overall than business status: you keep the SE tax exemption but lose every deduction.
What happens if the IRS decides my business is a hobby?
The income stays taxable as ordinary income, the self-employment tax drops off, and all your business deductions go away. In practice the IRS argues hobby status against loss-heavy side businesses to kill their deductions, which is the opposite of what most people expect the fight to be about.
How do I prove my side hustle is a business, not a hobby?
Profit in three of the last five years triggers a presumption that the activity is a business. Beyond that, the IRS weighs factors like keeping accurate books, the time and effort you invest, whether you depend on the income, whether you have changed methods to improve profitability, and the profit history. No single factor is decisive.
Does hobby income count toward the $400 self-employment tax threshold?
No. The $400 net-earnings trigger applies to business income computed on Schedule SE. Hobby income never enters that calculation, regardless of the amount.
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