If you sell through Amazon, eBay, Etsy or TikTok Shop, understanding the tax on online sales UK rules has become essential. Since HMRC introduced new reporting rules for online marketplaces, many casual and full time sellers have been receiving letters, emails or in app notices asking them to confirm their tax details. This guide explains, in plain English, when selling online counts as trading, when you need to register for Self Assessment, and how VAT fits into the picture once your online business grows.
Why HMRC Is Paying Closer Attention to Online Sellers
Since January 2024, digital platforms such as Amazon, eBay, Etsy and TikTok Shop have been required to collect information about their sellers and report it to HMRC once a year. This is part of a wider international agreement between tax authorities, and it means HMRC now receives details such as your name, address, bank account and total sales figures directly from the platforms you use.
This reporting requirement did not create a new tax. Selling items online has always been taxable when it counts as trading. What has changed is visibility. HMRC can now match the sales reported by a platform against what a seller has declared on their Self Assessment return, which is a key reason so many Amazon, eBay, Etsy and TikTok Shop sellers are now asking whether they owe tax on online sales in the UK. HMRC’s own additional income checker is a useful starting point if you are unsure whether tax on online sales UK rules apply to your situation.
Do You Need to Pay Tax on What You Sell Online?
Whether you owe tax on online sales UK depends on why you are selling, not simply how much you make.
Selling Personal Items You No Longer Need
If you are clearing out your wardrobe or selling unwanted household items on eBay or Vinted, this is usually not treated as trading, because you originally bought the items for personal use rather than to make a profit. Occasional, low value sales like this generally fall outside the tax system, although a very high value single item, such as a piece of jewellery or an antique, may raise a separate Capital Gains Tax question.
Buying, Making or Sourcing Stock to Resell
If you buy stock, make products, or source items with the intention of reselling them for a profit on Amazon, eBay, Etsy or TikTok Shop, HMRC considers this trading. It does not matter whether you see it as a side hustle, a hobby that grew, or a full time business. Once there is a clear profit motive and a degree of regularity, the income is taxable and needs to be reported.
The Trading Allowance and Self Assessment Registration
When working out tax on online sales UK, every individual gets a trading allowance of £1,000 a year. If your total income from online selling is below this in a tax year, you usually do not need to tell HMRC or register for Self Assessment. Once your gross income from Amazon, eBay, Etsy or TikTok Shop sales goes over £1,000, you are generally required to register for Self Assessment and declare the income, even if your actual profit after costs is small.
Registration should normally be completed by 5 October following the end of the tax year in which you started trading, with returns filed and tax paid by 31 January each year. Missing these deadlines can lead to penalties, so it is worth getting this right from the start. Our Self Assessment accountants can register you with HMRC, work out what you owe, and file your return correctly. If you already file a return, our guide on how to reduce your Self Assessment tax bill legally is a useful next read.
How the Marketplace Reporting Rules Affect Amazon, eBay, Etsy and TikTok Shop Sellers
Under the new rules, platforms generally report sellers who complete a meaningful number of transactions or cross a set earnings level within a calendar year. Because the rule applies to Amazon, eBay, Etsy, TikTok Shop and similar platforms at the same time, HMRC can potentially see activity across several marketplaces for the same seller, not just one. If you sell the same products across Amazon and TikTok Shop, for example, it is sensible to assume HMRC can see the full picture rather than each platform in isolation.
This makes accurate, combined record keeping across every platform you sell on more important than ever, particularly if you are approaching, or have already passed, the £1,000 trading allowance.
TikTok Shop Sellers: A Newer Platform, the Same Tax Rules
TikTok Shop is a newer addition to the UK ecommerce space, and many sellers using it are also active on Amazon, eBay or Etsy at the same time. Because TikTok Shop sits under the same platform reporting rules as longer established marketplaces, sellers should not assume a newer platform means less scrutiny from HMRC. The same trading allowance, Self Assessment and VAT rules apply, and combining your TikTok Shop figures with sales from other platforms is essential for knowing when a threshold has genuinely been crossed, since tax on online sales UK obligations are based on your total trading activity, not any single app.
VAT Considerations as Your Online Business Grows
Tax on online sales UK questions do not stop at Self Assessment. Once your VAT taxable turnover across all your sales channels, including Amazon, eBay, Etsy and TikTok Shop combined, goes over £90,000 in any rolling 12 month period, you must register for VAT. You can check the current thresholds directly on GOV.UK’s VAT registration guidance. Some sellers also choose to register voluntarily before reaching this threshold, for example to reclaim VAT on stock and equipment.
Sellers who buy and resell secondhand goods, such as many Etsy and eBay vintage traders, may also benefit from the VAT margin scheme, which taxes only the profit margin rather than the full sale price. You can read more in our guide to the UK VAT margin scheme, and our VAT services page explains how we handle registration, returns and scheme selection for growing sellers.
Bookkeeping Basics for Multi Platform Sellers
Selling across several marketplaces brings together different fee structures, payout schedules and currencies, which makes tax on online sales UK bookkeeping harder than for a typical small business. Good habits include keeping a separate business bank account, reconciling marketplace payouts against gross sales rather than just the net amount received, and recording platform fees, refunds and advertising costs separately so your true profit is clear.
We have written in more depth about this in our guide to ecommerce bookkeeping for Amazon and Shopify sellers, and our bookkeeping services page has more on how we can manage this for you month to month.
Common Mistakes Online Sellers Make with Tax
When it comes to tax on online sales UK compliance, we regularly see the same issues among Amazon, eBay, Etsy and TikTok Shop sellers who come to us after HMRC has already been in touch.
- Assuming a side hustle does not count as a business until it earns a certain amount
- Recording only the money that lands in the bank, rather than gross sales before fees
- Mixing personal and business spending in the same bank account
- Not putting money aside for tax as sales grow through the year
- Waiting until an HMRC letter arrives before registering for Self Assessment or VAT
Each of these is straightforward to fix with the right advice early on, and far more stressful and costly to correct after HMRC has already flagged your account.
How to Stay Compliant as Your Online Store Grows
Many sellers start as sole traders and later consider moving to a limited company once profits and risk increase. Our guide comparing a sole trader versus a limited company explains the tax and liability differences, and if you decide to incorporate, our company formation service, alongside our article on how to register a limited company in the UK, will guide you through the process. Sellers approaching higher income levels should also be aware of the upcoming Making Tax Digital for Income Tax rules, covered on our MTD for Income Tax page.
Practical Steps to Take This Tax Year
If you recognise your own situation in any of the points above, a few simple actions now can save a lot of stress later and make tax on online sales UK far easier to manage all year round.
- Add up your total online sales across every platform for the current tax year so far
- Check whether you have already passed the £1,000 trading allowance
- Open a separate bank account for your selling activity if you have not already
- Register for Self Assessment if you are over the allowance and have not yet registered
- Speak to a specialist ecommerce accountant before HMRC contacts you first
How NS Accounting Supports Amazon, eBay, Etsy and TikTok Shop Sellers
We work with sellers at every stage of understanding tax on online sales UK rules, from a first side hustle finding its feet to established multi platform ecommerce brands. Our accountants for ecommerce sellers and influencers service covers Self Assessment, VAT, bookkeeping and company formation under one roof, and our CFO services are available for sellers who have scaled to the point of needing forecasting and strategic financial support.
If HMRC has already contacted you about tax on online sales UK rules, or you simply want to get your Amazon, eBay, Etsy or TikTok Shop accounts in order before that happens, get in touch with our team for a straightforward conversation about where you stand.
