Advanced guide

When Reselling Becomes a Business: UK Tax, HMRC and VAT

There's a point where reselling stops being selling your own unwanted items and starts being a trade. That line matters, because it changes what you owe, what you must report, and eventually what fees you pay on every sale. Most people cross it without noticing.

The trading allowance

The UK has a £1,000 trading allowance covering casual self-employed income. Below that in gross trading income across a tax year, you generally don't need to report it. Above it, you're likely looking at Self Assessment. Note this is gross income, not profit, which catches people out: £1,200 of sales with £900 of costs is still over the threshold even though you made £300.

Selling your own things vs trading

Clearing your wardrobe isn't trading, even if it adds up. Buying with the intention of selling on at a profit is. HMRC uses a set of tests generally referred to as the badges of trade, which look at things like whether there was a profit-seeking motive, how frequent the transactions are, whether the goods were modified to sell, and how the sale was organised. Buying to resell hits several of those immediately.

What online platforms report

Under digital platform reporting rules, marketplaces share seller data with HMRC where thresholds are met. This means assuming your activity is invisible is not a viable strategy. Reporting rules and thresholds do change, so it's worth checking the current position on gov.uk rather than relying on what was true a couple of years ago.

The eBay fee consequence

This is the part that hits margins directly. eBay's UK fee structure treats private and business sellers differently, and registering as a business seller changes what you pay on every sale. It's not a reason to avoid registering, since your obligation is determined by what you're actually doing rather than which account type you selected, but it does mean your margins need recalculating when you make the switch. Our fees guide covers the mechanics.

VAT

VAT registration becomes compulsory once taxable turnover passes the registration threshold in a rolling 12-month period. Two things resellers commonly get wrong here. First, it's turnover, not profit, so a high-volume low-margin operation can hit it surprisingly fast. Second, it's a rolling twelve months, not a tax year, so it can trigger mid-year. Once registered you charge VAT on sales and can reclaim it on purchases, which materially changes how you should price.

Practical steps

1. Keep records from the start. Purchase price, sale price, fees, postage, date, per item. Retrofitting a year of records is genuinely miserable.
2. Track rolling turnover, not annual. A simple running twelve-month total tells you how close the VAT threshold actually is.
3. Talk to an accountant before you need one. The cost of an hour's advice is far less than the cost of an incorrect return.

None of this is a reason not to scale. It's a reason to scale deliberately, with the numbers in front of you.

Not financial advice. This is general information to help you make your own decisions, not a guarantee of any particular outcome.