Accountants for Ecommerce: VAT, Marketplace Rules & the 2026 EU Duty Change

UK online retail sales reached £127.41 billion in 2024, and the UK remains Europe’s largest ecommerce market — yet the tax picture behind that growth has become genuinely more complicated in the past few years. Marketplace “deemed supplier” rules mean Amazon and eBay collect VAT on some of your sales but not others, your true profit margin is buried under platform fees and settlement reports most sellers never fully reconcile, and from 1 July 2026 a significant EU customs change lands that most sellers shipping cross-border haven’t planned for yet.

This guide covers what a specialist accountant for ecommerce actually does, the marketplace VAT rules that catch sellers out, the new EU duty change most guidance hasn’t caught up with, and what it typically costs.

Quick Answer

An accountant for ecommerce handles VAT across UK and EU sales, reconciles multi-channel settlements from Amazon, eBay, Etsy, and Shopify into a single accurate set of accounts, and tracks the marketplace “deemed supplier” rules that mean platforms collect VAT on some of your sales but leave you responsible for the rest. From 1 July 2026, the EU is abolishing its €150 duty-free threshold for low-value parcels and introducing a new €3 per-item customs duty, affecting an estimated 93% of ecommerce parcels entering the EU — a cost that needs building into pricing now, not discovered after the change lands. Fees typically run £150–£400 a month for a multi-channel seller, more for businesses with significant EU or international sales.

Key Takeaways

• UK online retail sales reached £127.41 billion in 2024, with the UK remaining Europe’s largest ecommerce market.
• From 1 July 2026, the EU abolishes its €150 duty-free threshold and introduces a new €3 per-item customs duty on low-value parcels — affecting an estimated 93% of ecommerce parcels entering the EU.
• Platform-collected VAT can mask your true gross turnover, meaning some sellers cross the £90,000 UK VAT threshold without realising it.
• Marketplace “deemed supplier” rules (UK since January 2021) mean Amazon, eBay, and Etsy collect and remit VAT on certain sales — mainly overseas sellers and low-value imports — but you remain responsible for your own VAT on the rest.
• The OSS scheme lets you report EU-wide distance sales VAT through a single registration once you exceed the €10,000 EU-wide threshold.
• Typical fees run £150–£400 a month for multi-channel bookkeeping and VAT, scaling with order volume and number of sales channels.

Table of Contents

1. What Does an Accountant for Ecommerce Actually Do?
2. The New EU Duty Change: What’s Coming from 1 July 2026
3. Why Platform-Collected VAT Can Mask Your Real Turnover
4. Marketplace Deemed Supplier Rules Explained
5. OSS and IOSS for EU Sales
6. Multi-Channel Bookkeeping: Seeing Your Real Profit
7. Sole Trader or Limited Company for Ecommerce?
8. Ecommerce and London: What We See
9. A Worked Example: The 2026 Duty Change in Practice
10. How Much Does It Cost?
11. Common Mistakes People Make
12. Accountant Insights: What We See in Practice
13. Do You Need a Specialist Accountant? (Decision Framework)
14. General Accountant vs Ecommerce Specialist
15. Checklists
16. FAQs
17. Sources
18. Final Thoughts

What Does an Accountant for Ecommerce Actually Do?

Beyond standard accounts, a specialist reconciles settlement data across every channel you sell on into one accurate P&L, applies UK and EU VAT correctly given the deemed supplier rules, tracks your combined turnover against VAT thresholds that platform-collected VAT can otherwise obscure, and keeps pricing and compliance current against changes like the new July 2026 EU customs duty. They typically work through cloud software paired with an ecommerce connector — tools like A2X, Link My Books, or Taxomate — that pulls settlement data from Amazon, Shopify, or eBay directly into Xero or QuickBooks rather than relying on manual reconciliation.

The New EU Duty Change: What’s Coming from 1 July 2026

This is the change most ecommerce accounting guidance hasn’t fully caught up with yet. Historically, goods valued under €150 entering the EU were exempt from customs duty — only VAT applied, typically handled through the Import One-Stop Shop (IOSS). From 1 July 2026, that €150 duty-free threshold is abolished entirely, replaced with a new flat €3 customs duty per item on low-value parcels, applied even to goods processed through IOSS. Estimates suggest this affects roughly 93% of all ecommerce parcel flows into the EU — the vast majority of typical cross-border online orders.

The practical impact is on landed cost and pricing: a €3 flat charge per item is a genuinely different economic proposition for a €15 accessory than for a €150 order, disproportionately affecting sellers of lower-value goods shipped individually. Sellers who don’t update pricing models before the change risk either absorbing the cost silently or having customers hit with unexpected charges on delivery — both damaging outcomes that are entirely avoidable with advance planning.

Why Platform-Collected VAT Can Mask Your Real Turnover

UK VAT registration remains compulsory once taxable turnover exceeds £90,000 in a rolling 12-month period — the same threshold as any UK business. Where ecommerce sellers specifically get caught out is that marketplaces already collect and remit VAT on certain sales (mainly for overseas sellers and low-value imports), which can make gross platform revenue look smaller, or differently structured, than actual taxable turnover really is. Sellers checking only their bank deposits, rather than genuine gross sales across every channel, sometimes cross the threshold without realising it — a mistake that risks backdated VAT liability and a late-registration penalty once identified.

Marketplace Deemed Supplier Rules Explained

Since 1 January 2021, UK marketplace rules mean that where you sell goods to UK consumers via an online marketplace and those goods are located in the UK at the point of sale, the marketplace can be treated as the “deemed supplier,” responsible for accounting for VAT on that specific transaction rather than you. Broadly parallel EU rules apply to Amazon, eBay, and Etsy for certain cross-border and low-value transactions into the EU. Crucially, this doesn’t remove your own VAT obligations entirely — as a UK-established, VAT-registered seller, you remain responsible for VAT on sales the marketplace doesn’t treat as deemed supply, and for correctly identifying which of your transactions fall into each category.

OSS and IOSS for EU Sales

The EU’s One Stop Shop (OSS) scheme lets you report VAT on all EU-wide B2C distance sales through a single registration in one member state, rather than registering separately in each country you sell into — available once your EU-wide distance sales exceed the €10,000 threshold. The Import One Stop Shop (IOSS) covers low-value goods (traditionally up to €150, though this changes alongside the July 2026 duty reform) shipped directly to EU consumers from outside the EU, simplifying customs clearance and improving the delivery experience. Using IOSS generally requires an EU-established intermediary if you’re not established in the EU yourself — worth setting up properly from the outset rather than defaulting to duty-paid-on-delivery, which creates a worse customer experience.

Multi-Channel Bookkeeping: Seeing Your Real Profit

Selling across Amazon, eBay, Etsy, Shopify, and TikTok Shop simultaneously means your real profit is buried under platform fees, advertising spend, payment processing charges, refunds, shipping costs, and the cost of goods sold — all deducted before you ever see the money land in your bank account. Reconciling each platform’s settlement report against your bank, and against inventory and cost data, is the only way to see true margin by channel and by product — without it, sellers often can’t say with confidence which of their sales channels or products are genuinely profitable versus simply generating turnover.

Sole Trader or Limited Company for Ecommerce?

Many ecommerce sellers start as sole traders while testing a product or channel, which keeps initial admin simple. A limited company becomes worth considering once profit is consistently substantial, since Corporation Tax treatment and salary/dividend planning can offer genuine efficiency at that stage — though inventory valuation, FX gains and losses on multi-currency sales, and platform-fee categorisation all need proper handling in the Corporation Tax computation once incorporated, adding complexity beyond a straightforward service business.

Ecommerce and London: What We See

London consumers spend more on ecommerce than anywhere else in the UK — around £4,500 per person annually, well above the £3,716 national average and considerably higher than Northern England’s roughly £2,800. For sellers, that means London represents a disproportionately valuable customer base relative to its population, and London-based ecommerce businesses and brand teams often sit closest to the logistics, marketing, and platform-partnership infrastructure that supports scaling a multi-channel operation. With UK online retail sales at £127.41 billion and continuing to grow, the accounting complexity scales right alongside it — multi-channel reconciliation, VAT threshold monitoring, and now the July 2026 EU duty change all matter more as a London-based or London-focused ecommerce business grows.

A Worked Example: The 2026 Duty Change in Practice

Illustrative Example: Say a UK seller ships 500 low-value parcels a month to EU consumers via IOSS, each averaging €25. Before July 2026, these attract VAT only, with no customs duty since they fall under the old €150 threshold. From 1 July 2026, each parcel also attracts the new €3 flat duty — an additional €1,500 a month in costs that didn’t exist before. Built into pricing in advance, this is a manageable per-item adjustment; discovered after the change takes effect, it’s a sudden, unplanned hit to margin across the entire EU sales channel.

Illustrative Example: A different seller crosses the £90,000 UK VAT threshold without realising it, because a meaningful share of their Amazon sales were already having VAT collected by the marketplace under deemed supplier rules, making their own reported turnover look lower than genuine gross sales. Once identified, backdated VAT liability applies on sales since the date registration should have happened, plus a potential late-registration penalty — a cost that proper multi-channel turnover tracking from the outset would have avoided entirely.

How Much Does It Cost?

Common Mistakes People Make

1. Not planning pricing for the July 2026 EU duty change
Why it happens: The change is recent enough that many sellers haven’t factored it into their pricing models yet.
Consequence: Absorbing an unexpected per-item cost, or customers facing surprise charges on delivery.
How to avoid it: Model the €3 per-item duty into EU pricing before the change takes effect.

2. Assuming marketplace-collected VAT means no VAT obligation at all
Why it happens: It’s easy to assume the marketplace “handling VAT” covers everything.
Consequence: Under-declaring VAT on sales the marketplace doesn’t treat as deemed supply.
How to avoid it: Get your specific transaction mix reviewed to confirm which sales you’re still responsible for.

3. Checking bank deposits instead of gross turnover for the VAT threshold
Why it happens: Bank deposits feel like the natural figure to track.
Consequence: Crossing the £90,000 threshold without realising it, risking backdated liability and penalties.
How to avoid it: Track genuine gross turnover across every channel, not just what lands in the bank.

4. Not reconciling settlements properly across multiple channels
Why it happens: Manually checking Amazon, eBay, and Shopify settlements separately is time-consuming and easy to deprioritise.
Consequence: No clear view of real profit by channel or product, making growth decisions harder to justify.
How to avoid it: Use an ecommerce connector (A2X, Link My Books, Taxomate) to automate reconciliation into your accounting software.

5. Incorporating before the numbers genuinely justify it
Why it happens: A limited company can feel like the natural next step once sales grow.
Consequence: Extra admin and Corporation Tax computation complexity (inventory, FX, platform fees) without a matching tax saving at lower profit levels.
How to avoid it: Model the sole trader versus limited company position at your actual profit level first.

Accountant Insights: What We See in Practice

• The July 2026 EU duty change is, in our experience, still not widely factored into seller pricing — it’s a genuinely new cost that needs modelling before it lands, not after.
• Sellers who track gross turnover across every channel monthly catch a looming VAT threshold breach far earlier than those relying on bank deposits alone.
• Multi-channel sellers who reconcile settlements properly are often surprised by which channel or product is genuinely most profitable — gross sales rank differently from real margin more often than expected.
• Deemed supplier confusion is one of the most common VAT questions we get from newer ecommerce sellers, since the rules genuinely don’t remove all personal VAT responsibility.
• Sellers expanding into the EU benefit disproportionately from proper OSS/IOSS setup from day one, rather than retrofitting compliance after sales have already scaled.

Do You Need a Specialist Accountant?

Step 1: Map every sales channel and its VAT treatment. Confirm which of your transactions fall under marketplace deemed supplier rules.

Step 2: Track genuine gross turnover, not just bank deposits. Confirm your position against the £90,000 UK VAT threshold accurately.

Step 3: Model the July 2026 EU duty change into your pricing. Don’t wait for the change to land before adjusting.

Step 4: Set up proper multi-channel reconciliation. Use an ecommerce connector rather than manual settlement checking.

Step 5: Choose based on genuine ecommerce-sector experience. Marketplace VAT, OSS/IOSS, and multi-channel bookkeeping all need specialist, current knowledge.

General Accountant vs Ecommerce Specialist

Checklists

Checklist 1: VAT and Compliance

• ✓ Confirm which sales fall under marketplace deemed supplier rules
• ✓ Track genuine gross turnover across every channel monthly
• ✓ Confirm OSS/IOSS registration if selling into the EU
• ✓ Model the July 2026 EU duty change into your pricing

Checklist 2: Bookkeeping and Structure

• ✓ Set up an ecommerce connector for automated settlement reconciliation
• ✓ Review true margin by channel and product, not just gross sales
• ✓ Track inventory and cost of goods sold accurately
• ✓ Model sole trader versus limited company at your actual profit level

FAQs

What is changing with EU customs duty from July 2026?
The EU is abolishing its €150 duty-free threshold for low-value parcels and introducing a new €3 flat customs duty per item, affecting an estimated 93% of ecommerce parcels entering the EU.

Does Amazon or eBay handle all my VAT for me?
Only on certain transactions under deemed supplier rules, mainly for overseas sellers and low-value imports — you remain responsible for VAT on the rest of your sales as a UK-established, VAT-registered seller.

Why might I cross the VAT threshold without realising it?
Platform-collected VAT can make your reported figures look different from genuine gross turnover, so checking only bank deposits rather than total sales across every channel can mask when you’ve crossed £90,000.

What is the OSS scheme?
The One Stop Shop lets you report VAT on all EU-wide B2C distance sales through a single registration, available once EU-wide distance sales exceed €10,000.

What is the IOSS scheme?
The Import One Stop Shop simplifies VAT and customs clearance for low-value goods shipped directly to EU consumers from outside the EU.

How much does an ecommerce accountant cost?
Typically £150–£400 a month for multi-channel bookkeeping and VAT, rising for limited companies with inventory and multi-currency sales.

Should I use a general accountant or an ecommerce specialist?
A general accountant may suit a very simple, single-channel UK-only seller; anyone with multiple channels or EU sales benefits from specialist knowledge of marketplace VAT and OSS/IOSS rules.

What software do ecommerce accountants typically use?
Cloud accounting software like Xero or QuickBooks, paired with an ecommerce connector such as A2X, Link My Books, or Taxomate to automate settlement reconciliation.

When should I incorporate my ecommerce business?
Generally once profit is consistently substantial enough that Corporation Tax treatment and salary/dividend planning outweigh the added complexity of inventory and FX accounting.

Do I need to worry about EU VAT if I only sell through Amazon?
Often yes for certain transactions, though marketplace deemed supplier rules cover some of it — your specific position depends on where your stock is held and who your customers are.

Sources

• GOV.UK — VAT and overseas goods sold to customers in the UK using online marketplaces
• GOV.UK — VAT registration thresholds
• European Commission — One Stop Shop (OSS) and Import One Stop Shop (IOSS)
• European Commission — EU customs reform and low-value parcel duty changes

VAT thresholds, marketplace rules, and EU customs changes are subject to update — always confirm current figures and your specific position on GOV.UK and the European Commission’s official guidance before relying on them.

Final Thoughts

Ecommerce accounting has become genuinely more complex as marketplace rules, cross-border VAT, and now a fundamental EU customs change all interact — and the businesses that plan ahead for the July 2026 duty reform, rather than discovering it after the fact, will manage the transition far more smoothly. A specialist accountant for ecommerce should be tracking exactly this kind of change as standard, not leaving sellers to find out mid-quarter.

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