Short answer: not straight away, and possibly never. If you’re typing “do I need to register a business to sell online in the UK” into your phone at 11pm, slightly worried you’ve accidentally committed tax fraud by selling four jumpers on Vinted — relax. In the UK you can sell online without registering anything until your trading sales pass £1,000 in a tax year, and selling your own second-hand stuff doesn’t count as trading at all. This guide sets out where the line actually sits, when and how to register with HMRC, what the marketplaces now report, and what changes once you register. Every figure was checked against gov.uk on 7 August 2026.
The £1,000 trading allowance: the line that actually matters
“Registering a business” sounds heavier than it is. For a first-time online seller it almost never means Companies House, a trademark or a solicitor. It means one specific thing: telling HMRC you have trading income, by registering for Self Assessment as a self-employed sole trader.
And you only need to do that once your gross trading income — total sales before deducting any costs, fees or postage — goes over £1,000 in a tax year (6 April to 5 April). Under that, HMRC’s trading allowance covers you completely: no registration, no tax return, no tax on that income. The allowance exists precisely so that people testing an idea don’t have to file paperwork over £40 of card sales.
Two details catch people out:
- It’s gross, not profit. £1,200 of sales with £900 of material costs is over the line, because the test is what came in, not what you kept.
- It’s one allowance across all your trading. £600 on Etsy plus £600 at a craft fair in the same tax year is £1,200 — over.
Clear-out or trading? The badges of trade, in plain English
The £1,000 question only arises if you’re trading in the first place. Selling your own used possessions — clothes, an old phone, the bread maker from your 2021 sourdough phase — is not trading and is not taxed, whatever the total. HMRC separates the two using tests known as the “badges of trade”. Stripped of the legalese, they ask:
- Did you buy or make things in order to sell them? Making candles to sell is trading. Selling a coat you bought for yourself three winters ago is not.
- Is it repeated and organised? One loft clear-out looks nothing like a Sunday-night listing routine with stock photography.
- Do you buy in bulk, or improve things to sell on? Buying job lots at auction, or restoring furniture to flip, is trading.
- How quickly do things move? Buying something and reselling it within days points to trade; owning it for years points to a possession.
No single badge decides it, but the honest gut-check — “am I selling things I owned anyway, or running a small operation?” — nearly always lands on the same answer HMRC would reach.
So — do you need to register a business to sell online in the UK?
| Your situation | Trading? | Register with HMRC? |
|---|---|---|
| Selling your own used things, any amount | No | No — nothing to do |
| Making or buying to sell, under £1,000 gross per tax year | Yes | No — the trading allowance covers it |
| Making or buying to sell, over £1,000 gross per tax year | Yes | Yes — Self Assessment, by 5 October after that tax year ends |
| Taxable turnover passing £90,000 in any 12 months | Yes | Self Assessment plus VAT registration — a separate, much later milestone |
That last row is a long way off for most new sellers, but worth knowing it exists — our guide to UK VAT for online sellers covers it when you’re ready.
Two worked examples
The Vinted wardrobe clear-out: £1,850, no tax, no registration
Emma spends the summer clearing her wardrobe on Vinted: 60 sales, £1,850 in total. That’s over the platform-reporting threshold (more on that below), so Vinted will pass her details to HMRC in January. And still: she owes nothing and registers nothing. She’s selling possessions she bought for herself — not trading — so neither the £1,000 allowance nor Self Assessment applies to her. Being reported is not the same as being taxed.
The candle maker at £150 a month: register
Priya makes candles and sells roughly £150 a month across Etsy and Instagram — about £1,800 gross over the tax year. That’s trading (made to sell, repeated, organised) and it’s over £1,000, so she registers for Self Assessment. Registering doesn’t automatically mean a tax bill: she’ll be taxed on profit only, and can choose to deduct the flat £1,000 allowance instead of her actual costs if that works out better. On £1,800 of sales the bill will be small either way — the registration is the point, not the payment.
How and when to register with HMRC (it’s free)
The deadline is generous: 5 October following the end of the tax year in which you went over £1,000. Pass the line during 2026–27 — which ends 5 April 2027 — and you have until 5 October 2027 to register. Nobody needs to stop mid-sale and fill in forms.
- Register for Self Assessment on gov.uk as a sole trader. It’s an online form through a Government Gateway account and takes about ten minutes.
- HMRC posts you a Unique Taxpayer Reference (UTR).
- Each year, file your return by 31 October (paper) or 31 January (online), and pay anything owed by 31 January.
What it costs: nothing. No fee, no renewal, no minimum turnover. Registering as self-employed doesn’t register you for VAT, doesn’t require a business bank account, and doesn’t create a company — it simply tells HMRC to expect a tax return from you.
What eBay, Vinted and Etsy now report to HMRC
Since 1 January 2024, digital platforms have been required to collect sellers’ details and income and report them to HMRC — the first reports went in by 31 January 2025, and each calendar year’s data follows the January after. This is the change behind every “side hustle tax” headline you’ve seen, and the headlines were mostly wrong: no new tax was introduced. The rules on when you owe tax are exactly the ones above; what changed is that HMRC can now see marketplace sales.
Platforms don’t report you at all if, in a calendar year, you made fewer than 30 sales and received less than 2,000 euros (about £1,700). Go over either measure and your details are included — and, as gov.uk itself puts it, a platform reporting your details “does not automatically mean you owe tax”. What it does mean is that quietly trading past £1,000 without registering is now visible. Register on time and the reporting is a non-event.
What actually changes once you’re registered
- One tax return a year. You report your sales, deduct either real expenses or the £1,000 allowance, and pay income tax on the profit at your usual rate, alongside any employment income.
- Records. Keep sales and expense records. A spreadsheet is fine at this scale, and marketplace and shop platforms will export your orders for you.
- Making Tax Digital — eventually. From 6 April 2026, sole traders with qualifying income over £50,000 must keep digital records and send HMRC quarterly updates; the threshold falls to £30,000 in April 2027 and £20,000 in April 2028. At £150 a month this is years away, and you’ll see it coming.
- An announced easing. The government has said the Self Assessment reporting threshold for trading income will rise from £1,000 to £3,000, with a simpler online process for the in-between band — expected from the 2027–28 tax year, and not in force yet. The tax-free allowance itself stays at £1,000.
Sole trader, limited company — and where the shop fits in
Registering for Self Assessment makes you a sole trader, which is the default and the right answer for almost everyone at this stage: free, instant, no Companies House. A limited company adds real admin and only starts earning its keep at higher profits, or where liability genuinely matters — we’ve weighed the two properly in sole trader or limited company.
You’ll notice the tax side is the cheap bit. If you’re at the stage where marketplace fees are starting to sting and you want a shop of your own, we’ve broken down what starting an online shop in the UK actually costs. We build Orbit, a UK ecommerce platform, so read our numbers knowing that — but the short version is that a proper shop starts at £25 a month, and Orbit’s free Amazon, eBay and Etsy plugins let you keep the marketplace sales that got you past £1,000 in the first place, synced alongside your own site. There’s a 14-day trial with no card, which fits neatly inside the “am I actually trading?” experiment.
Either way: registering with HMRC is free, the deadline is months away, and nothing about it commits you to anything. It’s the least scary part of starting to sell.
Questions people ask us about registering to sell online
Can I sell online without registering a business in the UK?
Yes — legally and comfortably. If you’re trading (making or buying things to sell), you can take up to £1,000 gross per tax year under the trading allowance with no registration and no tax return. If you’re only selling your own used possessions, there’s no limit at all, because that isn’t trading.
Do I need to register with HMRC to sell on Vinted or eBay?
Only if you’re trading and your gross sales pass £1,000 in a tax year — then you register for Self Assessment by the 5 October after that tax year ends, which costs nothing. Clearing out your own wardrobe never requires registration, however much it raises.
Is selling online as a hobby taxable in the UK?
A hobby that sells what you make is still trading in HMRC’s eyes — the word “hobby” doesn’t appear in the test. Under £1,000 gross a year it’s covered by the trading allowance and there’s nothing to do; over £1,000 you register for Self Assessment and pay tax only on profit, after either your expenses or the £1,000 allowance.
Will HMRC know about my online sales?
If you make 30 or more sales, or receive 2,000 euros (about £1,700) or more, on a platform in a calendar year, that platform reports your details and income to HMRC the following January — rules in force since 1 January 2024. Being reported doesn’t create tax, but it does make unregistered trading over £1,000 visible, so register on time and it’s a non-event.