01
Read this first
What follows deliberately contains no rates, no thresholds and no deadlines, because any figure printed here would be wrong for most readers and out of date for the rest.
02
Who collects the tax: the split responsibility
The most confusing part for sellers is that tax on a sale may be collected by the marketplace, by you, or by neither, depending on the transaction. Understanding which is which resolves most of the confusion.
- Marketplace-collected tax. Many jurisdictions now require platforms to calculate, collect and remit consumption tax on sales made through them. Where this applies, the tax is added to what the buyer pays and passed to the authority by the platform — it never becomes yours to hold or remit.
- Tax you are responsible for. Where facilitator rules do not apply, where you sell outside a marketplace, or where your own registration status creates an obligation, collection and remittance fall to you.
- Tax on what you buy. A separate question. Whether tax you paid on stock and business costs is recoverable depends on your registration status and local rules.
- Import tax and duty. Different again, arising at borders and covered in international selling and customs.
A crucial consequence: marketplace collection does not necessarily remove your own registration obligation. Those are separate tests. Sellers who assume the platform handles everything are frequently unregistered while believing they are compliant, and the rules on this differ meaningfully between jurisdictions.
03
What tends to trigger registration
The triggers vary, but the categories of trigger are reasonably consistent. Any of these should prompt a conversation rather than a search.
| Trigger type | What it looks like | Why it catches sellers |
|---|---|---|
| Turnover threshold | Registration required once sales exceed a level over a defined period. | Usually measured on a rolling basis, so it can be crossed without a year ending. |
| Nexus or economic presence | Obligations in a region because of sales volume or presence there. | Can arise from selling into a place you have never been. |
| Cross-border sales | Selling to buyers in other countries. | May create obligations in the destination, sometimes from the first sale. |
| Holding stock elsewhere | Using a fulfilment service that stores goods in another jurisdiction. | Storage location can itself create a registration obligation. |
| Voluntary registration | Registering before you are required to. | Sometimes advantageous for recovering tax on purchases; sometimes not. Genuinely situation-specific. |
| Business structure change | Incorporating or restructuring. | Can reset or alter obligations. See business structure and registration. |
Rolling thresholds deserve particular attention because they are the most common way a compliant seller becomes non-compliant without noticing. A strong quarter can cross a rolling twelve-month threshold months before any annual accounting period ends, and the obligation begins then rather than at year end.
04
Why used goods are often treated differently
This matters enormously to resellers and is widely unknown. Many jurisdictions operate special arrangements for second-hand goods, because ordinary consumption tax rules would tax the same item repeatedly each time it changes hands.
The general shape of such arrangements is that tax is calculated on the seller's margin — the difference between what you paid and what you sold for — rather than on the full sale price. Where such a scheme exists and you qualify, the difference to your economics is substantial, particularly on low-margin, high-value items where taxing the full price would be ruinous.
- Availability, eligibility and mechanics vary by jurisdiction. Some have such schemes, some do not, and the qualifying conditions differ.
- Eligibility usually depends on how you acquired the goods, which is why purchase evidence matters even for cash purchases from private individuals.
- Record-keeping requirements are typically stricter, often demanding a specific form of purchase record per item.
- Certain categories are frequently excluded. Do not assume a scheme covers everything you sell.
- You generally cannot apply it retrospectively to goods whose acquisition you cannot evidence.
05
Reconciling what the marketplace reports
A recurring source of confusion and error: the numbers a platform reports will not match your bank, and neither will match your profit. All three are measuring different things.
- Gross sales include tax the platform collected and remitted, which was never your income.
- Payouts are net of fees, so they understate sales while overstating profit relative to what you actually earned.
- Refunds appear in different periods from the original sales, distorting any single month.
- Postage charged to buyers is income; postage you paid is a cost. Netting them off obscures both.
- Timing differs. A sale, its payout, and its bank appearance can fall in three different periods, and at year end this materially changes your figures.
The practical answer is to reconcile monthly from platform reports rather than from bank deposits, keeping tax collected by the marketplace visibly separate from your own income. Attempting this annually, across several channels, from bank statements alone is where sellers lose weeks — and it is a large part of why per-item records with fees and postage attached are worth maintaining as you go.
06
Operating sensibly under uncertainty
You will not resolve every question, and rules change. A few habits keep the uncertainty manageable and inexpensive.
- Set money aside as it arrives, in a separate account, at a rate your adviser confirms. Tax spent on stock is still owed.
- Keep purchase evidence for everything, including informal purchases. It is the input to both cost accounting and any margin treatment.
- Know which of your channels collect tax on your behalf, and where that leaves your own obligations. Write it down per channel.
- Watch rolling turnover, not annual, so a threshold is seen approaching rather than discovered afterwards.
- Review before you expand. A new country, a new fulfilment arrangement, or a new stock location can create obligations before the first sale — check first, not after.
- Have an adviser you can ask a short question, because the cost of a quick answer is trivial against the cost of a wrong assumption compounded over a year.
None of this is the interesting part of reselling. It is, however, the part where a profitable business can be undone by an obligation that accrued quietly — and the sellers who handle it calmly are the ones who built the records early, kept the money separate, and asked the question before they needed the answer.
07
Practice
Exercise
Reconcile one month
- For a single month, list every channel you sold on.
- Record what each reported collecting in tax, and what your own records show.
- Reconcile the two.
- Where they differ, find out why now, before it becomes a year of unexplained difference.
Check yourself
The marketplace says it collected tax on your sales. Does that settle your obligations?
Not necessarily, and this is the most common misunderstanding in the area. Responsibility is typically split: marketplaces collect some taxes on your behalf, and what remains yours varies by jurisdiction and by what you sell. This describes the mechanism rather than any jurisdiction's rules — what applies to you is a question for a qualified adviser.
Another seller tells you the registration threshold. Should you act on it?
No. Thresholds are jurisdiction-specific, often differ for used and new goods, and change. Second-hand accounts of them are the single most common source of expensive error here. Verify against the tax authority's own material, and take advice on your own situation.
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08
Common questions
The marketplace collects tax on my sales. Am I done?
Not necessarily. Marketplace collection and your own registration obligations are separate tests, and in many jurisdictions you can be required to register despite the platform collecting on marketplace transactions. It also does not cover sales you make elsewhere. Confirm your position with an adviser rather than inferring it from the platform's behaviour.
Is there really a scheme where I only pay tax on my margin?
Such schemes exist in a number of jurisdictions for second-hand goods, precisely because standard rules would tax the same item repeatedly. Whether one exists where you are, whether your goods qualify, and what records it demands are all local questions. Where one applies it can change your economics substantially, so it is worth asking about specifically rather than waiting to be told.
Should I register voluntarily before I have to?
Sometimes advantageous, sometimes not. It can allow recovery of tax paid on stock and business costs, but it also adds obligations and can affect your pricing to private buyers. The answer depends on your margins, your customer mix, and the rules where you are — a short, specific question for an accountant with your actual numbers in front of them.
What about sales to buyers in other countries?
Cross-border sales can create obligations in the destination as well as at home, and thresholds for that are often low or nonexistent. Marketplaces handle some of this for sales made through them, but not all of it and not everywhere. Get the position clear before you scale international sales rather than after — see international selling and customs.
How much should I set aside?
At a rate your adviser gives you, based on your structure, your margins and your obligations — and moved out of the trading account the moment receipts land. The specific percentage matters less than the discipline: money left in the account gets spent on stock, and the liability does not go away because the cash did.