Selling Online: A Clear Out or a Business? UK Tax Explained

You list a few clothes, find a buyer for an old bookshelf and suddenly your selling app asks for your National Insurance number. Does that mean you have started a business? Not necessarily. A request for information from a platform and a tax bill are two different things.

If you sell online in the UK, the useful starting point is why you are selling and where the items came from. This guide covers individuals selling goods, not companies or property rentals. The current HMRC guidance was checked on 19 October 2026. It describes existing rules, not proposals for a new online selling tax.

A clear out is different from buying stock

Selling possessions you bought for your own use will not usually create an Income Tax liability. Your wardrobe, old kitchen equipment and furniture are not automatically business stock because you put them on an app. Keep a note of what you sold and its background if the position could be unclear.

Buying goods specifically to resell for a profit points towards trading. So does making goods to sell, even if you call the activity a hobby. Ask yourself whether you are simply passing on things you no longer need or deliberately sourcing the next item for a customer. The label on your profile is less important than the activity itself.

The £1,000 test uses income, not profit

For an individual who is trading, the trading allowance can cover up to £1,000 of annual gross trading income, subject to eligibility. Gross means before expenses. Do not subtract purchases, packaging or platform fees before testing that amount. Add together relevant trading income across activities rather than treating each app as a separate allowance.

Income above £1,000 normally means you need to register for Self Assessment if not already registered. It does not automatically mean tax is payable. The calculation depends on your circumstances. When eligible, you can generally deduct the trading allowance instead of actual business expenses, not both. There are exclusions, including partnership income and certain income from employers or connected companies.

A hypothetical example: the weekend reseller

Imagine someone buys secondhand lamps to resell. During one tax year, customers pay £1,800 before fees. Stock and other potentially allowable costs total £1,250. Their trading profit before considering the allowance would be £550, but their gross trading income is still £1,800. The reporting question cannot be answered by comparing £550 with £1,000.

This is a hypothetical illustration, not a client case or a complete tax calculation. Actual expenses would need checking, and the person might have other income. The practical point is simple: write down sales and costs separately. A small profit does not make the gross income test disappear.

Platform reporting is not a tax free limit

Digital platform reporting rules began on 1 January 2024. A platform may collect identifying information and share seller information with HMRC. Being included in a report does not, on its own, establish that you are trading or that you owe tax.

For goods, the reporting exclusion requires both fewer than 30 sales and receipts below €2,000 in the calendar year. Those are platform reporting conditions, not a personal tax allowance. Do not use them as permission to ignore business income. Equally, a reported clear out does not automatically become a taxable business.

Keep the right dates and documents

Platform statements may cover January to December, while the UK tax year runs from 6 April to 5 April. For 2025/26, organise the relevant income and costs from 6 April 2025 to 5 April 2026. Reconcile sales, refunds, fees and bank payouts rather than assuming a bank deposit shows the full sale value.

If you needed to register for 2025/26, the usual notification deadline was 5 October 2026. If you missed it, act now rather than waiting. The standard paper return deadline is 31 October 2026 and the online deadline is 31 January 2027. Payment is normally due by 31 January 2027; check any notice HMRC has sent for your particular circumstances.

Know when to ask for a review

High value possessions need a separate check. Selling an individual possession, or certain sets, for more than £6,000 can raise Capital Gains Tax questions even when you are not trading. The sale proceeds are not automatically the taxable gain, so get advice before assuming either that everything is taxable or that nothing needs reporting.

Download your platform statements, separate personal items from resale stock and bring your sales and expense records together. If you are unsure which category fits, EvolveBooks can help you review the position in English or Spanish. A clear answer now is better than months of worrying about an app notification.

Explore our Self Assessment support and monthly bookkeeping guide, or contact EvolveBooks to discuss your online selling records.