Katy Proctor
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Running an ecommerce business from London in 2026 means navigating a tax and compliance environment that changes faster than almost any other sector. Post-Brexit VAT rules have diverged significantly from EU frameworks. Marketplace platforms like Amazon and eBay now sit inside the VAT chain in ways that directly affect how you report and account for your sales. Selling internationally introduces multi-currency accounting complexity that high street accountants rarely handle well and the operational realities of managing inventory, platform fees, fulfilment costs and multi-channel revenue make ecommerce genuinely different from any other kind of business.
The online retailers growing fastest in London right now aren't trying to make generalist accounting advice fit a specialist problem. They're working with accountants who understand how ecommerce actually works, the platforms, the VAT obligations, and the financial discipline that scales an online business properly.
This guide covers the tax and accounting issues that matter most for London ecommerce businesses operating as limited companies in 2026.
The issues an ecommerce business faces are structurally different from those of a traditional retailer or service business, and the difference matters when it comes to getting the right advice.
A specialist ecommerce accountant understands how revenue flows differently across Shopify, Amazon, eBay, Etsy and direct-to-consumer channels and how marketplace fees, payment processor deductions and platform settlements affect what lands in your bank account versus what appears in your reported turnover. They understand how the deemed supplier rules change your VAT position depending on where your customers and stock are located. They understand what a clean multi-currency reconciliation looks like versus a spreadsheet that never quite balances. And they understand how inventory sits on the balance sheet and why getting it wrong distorts both your tax position and your management decisions.
Generalist accountants tend to treat an online retailer like any other small business. The result is usually a VAT setup that doesn't reflect how the platforms actually work, accounts that don't reconcile cleanly to the payment processors, and tax planning that misses the opportunities specific to ecommerce. The cost in overpaid tax, missed reclaims and compliance exposure — compounds year on year.
Pulse Accountants works exclusively with limited companies, and ecommerce is one of the sectors we work with regularly. Our team supports growing online retailers, multi-platform sellers, direct-to-consumer brands and London-headquartered ecommerce operators.
UK VAT registration becomes mandatory once your taxable turnover crosses the current threshold in any rolling twelve-month period, not a tax year or calendar year, but any consecutive twelve months. For fast-growing ecommerce businesses, this can happen without realising it, particularly where revenue is spread across multiple platforms not being monitored collectively.
There is also a forward-looking test: if you have reasonable grounds to believe your turnover will exceed the threshold within the next thirty days alone, you must register immediately. A large wholesale order or a viral product launch can trigger this without warning.
For overseas sellers storing goods in UK warehouses, including through Amazon FBA, there is no threshold at all. Registration is required from the very first UK sale.
Once registered, you must charge VAT on UK sales, file returns through Making Tax Digital-compatible software, and maintain full digital records. The key question for ecommerce businesses is how VAT interacts with each sales channel because the rules differ across platforms, and HMRC's data-sharing arrangements with major marketplaces mean discrepancies are flagged automatically.
Voluntary registration before hitting the threshold can make sense for businesses selling primarily to VAT-registered customers, or with significant input VAT to reclaim on stock and services. For businesses selling mainly to consumers, it affects pricing competitiveness and needs to be modelled before the decision is made.
Under the deemed supplier rules, platforms like Amazon and eBay are treated as the VAT-responsible party for certain transactions, the platform collects and remits VAT directly to HMRC, and the seller accounts for a deemed supply rather than a standard sale.
The rules apply in two main scenarios: imports of low-value goods into the UK from overseas sellers, and sales of goods stored in UK warehouses where the seller is based outside the UK. For UK-based sellers selling from UK stock to UK customers, the deemed supplier rules generally do not apply, you remain responsible for the VAT in the normal way.
The most expensive mistake in ecommerce VAT is assuming that because the marketplace collects VAT on some transactions, the seller has no further reporting obligation. This is wrong. Even where Amazon or eBay acts as deemed supplier, you are still required to report those transactions on your VAT return as deemed supplies and maintain full digital records. Sellers who don't report correctly can appear to HMRC to be significantly under-reporting their activity.
Shopify is not a marketplace in the UK or EU legal sense, it is a platform on which you operate your own store. If you sell through your own Shopify site, you are the seller of record for every transaction. The deemed supplier rules do not apply, and the VAT obligation sits entirely with you regardless of volume.
Multi-channel sellers running simultaneously across Amazon, eBay, Etsy and Shopify face a different VAT analysis for each, depending on transaction type, stock location and customer location. Consolidating this correctly into a compliant VAT return requires ecommerce-specific expertise, not generic VAT knowledge.
The moment you sell to overseas customers, hold balances with international payment processors, or receive settlements in foreign currencies, your accounting needs to handle foreign exchange properly. London ecommerce businesses typically carry balances across Stripe, PayPal, Amazon, Wise and direct bank accounts in multiple currencies simultaneously, and the FX movements between these need to be recognised correctly for both Corporation Tax and statutory reporting.
FX gains and losses are real economic events that affect what your business is worth at any given point. They need to flow through your accounts accurately rather than sitting as unreconciled differences and they directly affect your reported profit and tax position.
Cloud accounting platforms like Xero and QuickBooks handle multi-currency properly when set up correctly, reconciling FX movements automatically and producing clean reports in your functional currency. Many ecommerce businesses are nominally on these platforms but have bank feeds connected in ways that don't reconcile currency movements accurately. For businesses that have grown quickly, multi-currency accounting is one of the most common areas where the setup has been outgrown without the business realising it.
For most ecommerce businesses, stock is the largest item on the balance sheet. How it is recorded, valued and adjusted through the year directly affects reported profit, Corporation Tax liability and management decision-making. Getting it wrong doesn't just create a year-end tidy-up problem, it creates decisions made on inaccurate information.
Amazon FBA inventory, stock in third-party fulfilment centres, in-transit stock from overseas suppliers, returns awaiting inspection and stock requiring write-off all need to flow through the accounts correctly. The reconciliation between what your sales platform reports and what you physically hold needs to happen regularly, not annually.
Ecommerce businesses that treat inventory as an afterthought tend to either overstate profits because stock is over-recorded and cost of goods sold is understated or understate them when stock movements aren't captured properly. Either way, the tax position doesn't reflect the economic reality of the business. Annual reconciliation at year end is too late to be useful; monthly reconciliation feeding into real-time management accounts is achievable with the right setup and essential for any growing online retailer.
R&D tax relief is one of the most underused reliefs available to ecommerce businesses, largely because the sector doesn't think of itself as doing research and development. The eligibility test is not about whether you are a technology company, it is about whether your business has resolved genuine technical uncertainty in the course of its work, and ecommerce operations frequently do.
Qualifying activity for online retailers can include custom development on Shopify, WooCommerce or headless commerce platforms; bespoke integrations between ecommerce and fulfilment, warehouse or ERP systems; custom recommendation or personalisation engines; fraud detection tools built or significantly adapted for the business; and automated pricing or inventory management systems.
The R&D landscape changed significantly following the 2023 and 2024 reforms, which merged the previous SME and RDEC schemes and substantially tightened documentation requirements. HMRC's compliance focus is sharper than at any point in the scheme's history, and poorly prepared claims are being challenged. Properly prepared claims for genuine qualifying activity remain a material cash benefit but they need specialist input, not a template.
Pulse works exclusively with limited companies, and ecommerce is a sector we know well. We support growing online retailers, multi-platform sellers and direct-to-consumer brands with Corporation Tax and statutory accounts, UK VAT registration and returns, EU OSS and IOSS compliance, marketplace VAT analysis across Amazon, eBay, Etsy and Shopify, multi-currency accounting on Xero and QuickBooks, inventory accounting, R&D tax relief claims, and year-round strategic tax planning.
We have a London office at 368 Gray's Inn Road, King's Cross, alongside our head office in Newton Aycliffe and Newcastle office.
For more on how we work with the sector, visit our [Ecommerce page]. For our London presence, visit our [London office page]
Do I need to register for VAT if I only sell through Amazon or eBay?
Yes, if your taxable turnover exceeds the current UK threshold in any rolling twelve-month period. Selling through a marketplace doesn't remove your registration obligation, it only affects who accounts for VAT on certain specific transactions. Overseas sellers storing goods in a UK warehouse have no threshold and must register from their first sale.
Does Amazon handle all the VAT on my sales so I don't need to worry about it?
No. Amazon acts as deemed supplier for specific transaction types, primarily imports from overseas sellers and certain low-value consignments. UK-based sellers selling from UK stock remain responsible for their own VAT. Even where Amazon handles the VAT, you must still report those transactions on your VAT return as deemed supplies and maintain full digital records.
What is the difference between OSS and IOSS for selling into the EU?
OSS covers intra-EU cross-border sales where goods are already in the EU and shipped to consumers in other EU countries. IOSS covers imports of low-value goods shipped directly to EU consumers from outside the EU, including from the UK. Both schemes simplify compliance by replacing country-by-country registration.
Can my Shopify store use OSS or IOSS?
If you sell through your own Shopify store to EU consumers and ship from the UK, IOSS is the relevant scheme for low-value consignments. Shopify is not a marketplace for VAT purposes, so the compliance obligation sits with you, not the platform.
Does my ecommerce business qualify for R&D tax relief?
Possibly and it's worth a proper assessment. Qualifying activity is not limited to tech companies. Ecommerce businesses with bespoke platform development, custom integrations between selling and fulfilment systems, or automated pricing and inventory tools may have qualifying projects. The regime has tightened significantly, so specialist assessment is essential before making a claim.
Get in touch:
Website: www.pulse-accountants.co.uk
Email: help@pulse-accountants.co.uk
London office: 368 Gray's Inn Road, King's Cross, London
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