Do Whatnot sellers pay self-employment tax?

If you are selling on Whatnot as a business rather than as a hobby, and your net earnings from it reach $400 for the year, then yes: self-employment tax applies, and it is charged on top of income tax rather than instead of it. The rate is 15.3%, made of 12.4% for social security and 2.9% for Medicare, per IRS Publication 334 for the 2025 tax year, last reviewed 30 April 2026.

It is the part sellers do not see coming, because it does not behave like income tax. There are no brackets, and the $400 is a threshold rather than an allowance: once your net earnings reach it, the whole amount is charged and not just the part above. Set aside only your income-tax rate and you are short by about 14% of your profit in self-employment tax alone.

This article is records guidance, not tax advice, and it describes the US federal system. Your state, and your own circumstances, change the answer. Everything below is quoted from IRS pages with the date they carried when they were read, 16 September 2026.

Self-employment tax is the social security and Medicare charge on people who work for themselves. An employee pays those through their paycheck and their employer pays alongside them; working for yourself there is nobody alongside you, which is why 15.3% is so much larger than the payroll line an employee recognises.

It is figured on Schedule SE, and the profit it starts from comes off Schedule C, which is the form a sole proprietor or independent contractor generally uses to work out earnings subject to the tax. Those are the two forms behind every plain-English version of this question, and they are worth knowing by name before you talk to an accountant.

Self-employment tax is not charged on what your shows grossed, and not quite on your profit either. The chain has three links. First comes the profit line on Schedule C, which is what the gross-to-taxable walk ends at. That profit is then multiplied by 92.35% to give net earnings from self-employment. The 15.3% is charged on that.

The 92.35% is not a discount anyone chose to give you. It is a step Schedule SE builds in at line 4a: net earnings are 92.35% of your profit, and the 15.3% is charged on that figure rather than on the profit itself.

So the rule of thumb worth carrying is not 15.3% of profit but 14.13% of it, and that is before any income tax. The half you deduct is a separate step again: it comes off your income on Schedule 1, which lowers the income tax underneath without changing the self-employment tax itself.

The floor is $400 of net earnings for the year, not per show and not per sale, which works out at just over $433 of profit. Below that the $400 rule does not bite, and the IRS names narrow exceptions of its own that no card seller meets. It is a smaller mercy than it sounds either way: income is still income below the floor, and it still gets reported.

For a sense of the scale, the single case break worked through in Whatnot taxes for sellers leaves $364.80 before its other costs. One break like that is under the floor on its own. The floor counts the whole year though, so the second one clears it, which is why it catches sellers who think of themselves as doing this on the side.

At the other end, only the first $176,100 of your combined wages, tips and net earnings pays the 12.4% social security part, on the 2025 tax year's figures, the ones a 2025 return uses. That ceiling is set for each tax year, so check the current year's figure before you budget against it; the 15.3% rate and the $400 floor have not moved with it. The word combined is the one to notice: wages from a day job fill that ceiling first, so the sellers most likely to reach it are the ones with another income, not the ones selling most. The 2.9% Medicare part has no ceiling at all and is charged on every dollar of net earnings, and a further 0.9% Additional Medicare Tax can apply at high incomes, starting at $125,000 for married filing separately and $250,000 for married filing jointly, with other filing statuses set at their own thresholds. Those last figures are from the IRS self-employment tax page, last reviewed 27 June 2026, and the ceiling from the Instructions for Schedule SE for 2025.

Self-employment tax is figured from the earnings Schedule C produces, and hobby income does not go on Schedule C. Income from an activity carried on with no intention of making a profit is reported on Schedule 1 of Form 1040 instead, per the IRS tax tip of 30 June 2021. So the hobby question is not a technicality: it decides which form your selling lands on, and self-employment tax follows the business side of that fork.

It is not a choice you make by preference. The same IRS tax tip lists nine factors for it, the first being whether the activity is carried on in a businesslike way with complete and accurate books. Whatnot hobby or business walks the themes behind them. Sellers sometimes hope for hobby treatment to dodge this tax, and it is usually a bad trade: hobby sellers commonly face narrower or no ability to deduct what the activity cost them.

Self-employment tax is the missing piece in most quarterly-payment shocks. What an estimated payment covers is income tax and self-employment tax together, so a seller who worked out their bracket and set that aside has provided for one of the two. Do Whatnot sellers pay quarterly estimated taxes covers the cadence, the $1,000 test and the four payment periods, which are not four equal quarters.

The practical version: set aside a percentage of net profit as it is earned, not of gross, and pick the percentage with both taxes in mind.

Under the US federal rules, having a day job does not exempt the business. If you sell as a business and your net earnings from it reach the $400 floor for the year, self-employment tax applies to those earnings whatever else you earn. Your wages do interact with it in one place: the 12.4% social security part stops at a ceiling counted across your combined wages, tips and net earnings, so wages fill that ceiling first. The 2.9% Medicare part has no ceiling at all.

No, and in the US system they measure different things. A 1099-K is an information return a marketplace files to report the gross payments that moved through it, and it arrives whether or not you owed anything. Self-employment tax is a real charge on your net earnings, which is what is left after the fees, the postage and what your inventory cost. One is a statement of money that passed through; the other is worked out from profit you have to calculate yourself.

Which thresholds put a 1099-K in your mailbox, and why the number on it is the wrong one to report as income, are in does Whatnot send tax forms.

Every figure above hangs off one number, the profit line on Schedule C, and that number is only as good as your records. Gross sales come off your Weekly Order Report, which itemises the fees too. What the inventory cost is the line the platform never sees, and cost of goods for card resellers covers the two common ways of counting it. The rest of what you can subtract is in Whatnot seller tax deductions, and the whole gross-to-taxable walk is in Whatnot taxes for sellers.

Overstate that profit and you pay 14.13% of the overstatement in self-employment tax alone, on top of the income tax. Understate it and you have a different problem. Either way the cure is the same, and it is the one thing you can still fix before December: write down what each purchase cost you, while you still remember.

BreakCount does that bookkeeping for Whatnot sellers. Import the report, add one cost per purchase lot, and the Tax pack gives you one page for any period: gross sales, commission, payment processing, the shipping you paid, giveaways, the cost of the lots that closed, other costs and net profit, with a CSV your accountant can work straight from. The Tax pack sits on the Breaker plan, while imports, verdicts and lot costs are on the free plan from the start, with the free plan reading the last 30 days of history. It keeps records; it does not give tax advice, and it is not a substitute for an hour with a professional.

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