Post-Brexit Selling in the UK 2026: Customs, VAT, EORI & Cross-Border E-Commerce Guide

The Post-Brexit UK Trade Landscape at a Glance

Below is a quick map of the six compliance pillars every UK-facing seller must master in 2026. Keep this card stack nearby as you read each deep-dive section.

1. What Brexit Actually Changed on 1 January 2021

From Single Market to Third Country

At 23:00 GMT on 31 December 2020, the United Kingdom left the EU Single Market and Customs Union. Despite the Trade and Cooperation Agreement (TCA) being signed just days earlier — on 30 December 2020 — every shipment crossing the GB-EU border from 1 January 2021 became a third-country movement, requiring formal customs declarations on both sides. Politically, the UK had voted to leave on 23 June 2016; legally, it had left on 31 January 2020; but operationally for e-commerce, 1 January 2021 is the date that matters.

The TCA secures zero tariffs and zero quotas on goods that meet the agreement's preferential rules of origin — a meaningful concession compared to a no-deal scenario. But "zero tariff" and "frictionless" are not the same thing: TCA trade requires customs declarations, commodity codes, valuation, origin statements, EORI numbers, and (for some goods) sanitary, phytosanitary and product-conformity certifications.

The Five Big Shifts for E-Commerce

1. Customs declarations became universal — every parcel crossing the GB-EU border needs a formal export and import declaration.
2. The £15 LVCR was abolished on 1 January 2021. Every imported parcel into GB now carries VAT exposure from the first penny of value.
3. VAT registration thresholds reset — overseas sellers storing stock in the UK must register for UK VAT immediately, regardless of turnover.
4. Product conformity diverged — UKCA marking was introduced for GB, although CE remains accepted indefinitely after the 2024 decision.
5. Free movement within Pan-EU FBA ended — Amazon split UK and EU fulfilment stock pools.

2. UK → EU Sales: New Customs Declarations & EORI

Every Parcel Now Has a Declaration

If you sell from a UK address to an EU consumer, every shipment requires a UK export declaration and an EU import declaration. For postal and courier B2C movements, the carrier typically lodges these on your behalf using data you supply on the commercial invoice and CN22 / CN23 customs form (postal) or the equivalent fields on the courier's electronic manifest.

The minimum data you must provide on every cross-border invoice is:

• Sender details including GB EORI
• Recipient details including, for B2B, their EU EORI / VAT number
• Item description in plain English (and ideally translated for clarity)
• Commodity code (HS) — six digits minimum, eight or ten preferred
• Country of origin
• Customs value (item price + freight + insurance, CIF basis)
• Incoterm — typically DAP (delivered at place) or DDP (delivered duty paid) for B2C
• Reason for export (sale, gift, return, sample)

VAT Mechanics: IOSS for B2C Under €150

For B2C sales from the UK into the EU at a consignment value of €150 or less, the EU's Import One Stop Shop (IOSS) scheme is the cleanest route. The seller (or an EU-based IOSS intermediary acting for them) collects EU destination-country VAT at the checkout, displays it as part of the sale price, and remits monthly via a single IOSS return.

The benefit to the buyer is enormous: a parcel shipped IOSS-paid clears EU customs automatically, with no doorstep "handling fee" surprise from the carrier. The benefit to the seller is comparable: cart-abandonment rates on cross-border B2C drop sharply when the buyer sees a fully-landed price at checkout.

For consignments above €150, IOSS does not apply — instead, EU VAT is paid on import either by the customer (DAP) or by the seller acting as importer of record (DDP). DDP at higher price points improves conversion but requires the UK seller to handle EU VAT registration in the destination country or via the Union OSS for B2B-to-private routes.

The GB EORI — Mandatory for UK-Side Declarations

A GB EORI number (format GB followed by your 9-digit VAT number, padded with three zeros — e.g. GB123456789000) is HMRC's identifier for traders moving goods across the GB border. It is free to apply for via the GOV.UK portal and typically issued within 3-5 working days. Without a GB EORI, no UK export declaration can be lodged, and your shipment will be held at the border.

3. EU → UK Sales: UK VAT, IOSS Limits & the £135 Rule

The £135 Low-Value VAT Rule

The headline change for EU → UK B2C is the abolition of the £15 Low Value Consignment Relief (LVCR) on 1 January 2021. Every imported parcel into Great Britain now carries UK VAT exposure from £0.01 of value. The split is based on consignment value (item price excluding VAT, plus shipping if charged separately):

• £135 or less — UK VAT collected at the point of sale. If the sale runs through an Online Marketplace (Amazon, eBay, Etsy, etc.), the marketplace is liable to collect and remit. If it's a direct B2C sale, the EU seller must register for UK VAT and remit themselves.
• Above £135 — UK VAT and (if applicable) customs duty are paid on import, either by the customer (DAP) or by the seller as importer of record (DDP).

IOSS Does Not Cover UK Imports

A common source of confusion: the EU's IOSS scheme is for EU-bound parcels only. It has no UK counterpart. EU sellers exporting to the UK cannot use IOSS to collect UK VAT — they must register for UK VAT directly (typically as a Non-Established Taxable Person) and use the equivalent UK process, or rely on the marketplace under the Online Marketplace rules.

UK VAT Registration for Overseas Sellers

For EU sellers exporting to UK customers, the question is whether to:

1. Sell only through UK marketplaces (Amazon UK, eBay UK) and let the marketplace handle £135-or-less VAT — minimal registration burden, but you lose the direct customer relationship.
2. Register for UK VAT as a Non-Established Taxable Person (NETP) and trade DDP — full control of the customer experience, full landed-cost transparency, but a quarterly UK VAT return obligation.
3. Hold stock in a UK fulfilment centre (FBA UK, third-party 3PL) — triggers immediate UK VAT registration regardless of turnover (the £90,000 threshold applies only to UK-established businesses).

The UK VAT Registration Threshold for UK-Established Sellers

For UK-established sellers, the VAT registration threshold rose to £90,000 at the 2024 Budget (up from £85,000). Once your taxable turnover in any rolling 12-month period exceeds £90,000, you must register for VAT within 30 days and start charging 20% VAT on standard-rated sales. The deregistration threshold is £88,000.

4. EORI Registration — GB EORI vs EU EORI vs XI EORI

Three EORIs, Three Distinct Functions

An EORI (Economic Operators Registration and Identification) number identifies a trader to customs authorities. Before Brexit, a single EU EORI served the whole single market. After Brexit, three distinct EORIs exist, and they are not interchangeable:

EORI Type	Format	Used For	Issued By
GB EORI	GB + 12 digits (often VAT + "000")	GB customs declarations — England, Scotland, Wales	HMRC (GOV.UK)
XI EORI	XI + 12 digits	Northern Ireland customs movements under the Windsor Framework	HMRC (NI traders or under UKIMS)
EU EORI	Country code (e.g. DE, FR, IE) + digits	EU import declarations from a UK-side export	EU member-state customs authority

Why You Almost Certainly Need Two

If you sell from a UK base into the EU, you need:

• A GB EORI to clear the goods out of Great Britain
• An EU EORI (or your customer's EU EORI, in B2B) to clear them into the EU on the other side

If you sell DDP (delivered duty paid) and are acting as importer of record on the EU side, you must obtain an EU EORI from a single EU member state — typically Ireland (linguistic and legal proximity), the Netherlands (logistics hub), or Germany (largest market). One EU EORI is recognised across all 27 EU customs authorities.

How to Apply for a GB EORI

The GOV.UK process is straightforward:

1. Log in to your Government Gateway account
2. Select "Get an EORI number"
3. Provide your VAT number, Unique Taxpayer Reference (UTR), Companies House number (if applicable), business address and contact details
4. Submit; you'll receive your GB EORI by email, typically within 3-5 working days, sometimes within minutes if your data matches HMRC records cleanly

How to Apply for an EU EORI

Each EU member state has its own portal. For UK-based sellers selecting Ireland (a popular choice), the process is via the Revenue Online Service (ROS); for the Netherlands, via Mijn Douane; for Germany, via the Zoll portal. The data requirements are similar to HMRC's, but you'll typically need either an EU establishment or a registered EU fiscal representative — many UK sellers contract a third-party representative for this.

XI EORI for Northern Ireland

If your business is established in Northern Ireland (or you frequently move goods into NI from GB under the Windsor Framework), you need an XI EORI. HMRC issues XI EORIs automatically to GB EORI holders who indicate a Northern Ireland trade need on their EORI application. The XI EORI is what you cite on EU import declarations for NI-routed goods — it acts as a bridge between the GB and EU customs systems.

5. Northern Ireland & the Windsor Framework

The Original Protocol — Why It Needed Fixing

The Northern Ireland Protocol, signed alongside the 2019 Withdrawal Agreement, kept Northern Ireland aligned with EU single-market rules for goods, to avoid a hard border on the island of Ireland (a foundational requirement of the 1998 Belfast / Good Friday Agreement). The trade-off was an effective customs border in the Irish Sea between GB and NI — supermarkets, parcel carriers and SME sellers reported significant friction on routine GB→NI shipments through 2021-2023.

The Windsor Framework — Agreed February 2023

On 27 February 2023, Prime Minister Rishi Sunak and Commission President Ursula von der Leyen agreed the Windsor Framework, which amends the Protocol to introduce a green lane / red lane model for goods crossing from GB into NI. Key dates:

• February 2023 — Framework agreed
• October 2023 — Stormont Brake provisions in force
• October 2024 — Green lane operational for retail goods (UK Internal Market Scheme — UKIMS)
• March 2026 onward — Phased rollout for parcels, agri-food and SPS goods

How the Green / Red Lane Works

• Green Lane — for goods staying in Northern Ireland. Minimal customs checks, no full EU customs declaration. Requires the trader to be registered under the UK Internal Market Scheme (UKIMS) and to certify that goods are not at risk of onward movement to the EU single market.
• Red Lane — for goods at risk of moving on into the EU single market (e.g. unknown-destination wholesaling, restricted goods, non-UKIMS traders). Full EU customs procedures apply, equivalent to a GB→IE shipment.

UKIMS Registration — Who Needs It

Any business moving goods from GB to NI for sale to end consumers — or for transfer between own warehouses in NI — should register for UKIMS via the GOV.UK Trader Goods Profile (TGP). Registration takes 30 days; the trader self-certifies eligibility (broadly: UK-established and not predominantly re-exporting to the EU). UKIMS membership unlocks the green lane and substantially reduces day-to-day friction on NI shipments.

Dual Access — Why Some NI Businesses Are the Brexit Winners

Businesses established in Northern Ireland enjoy a unique status known as dual access: goods produced in NI flow freely into both Great Britain (under the UK Internal Market Act) and the EU single market (under the Protocol / Windsor Framework). A NI manufacturer can sell to a London buyer and a Paris buyer with equivalent friction — the only such position in Europe today. For specific verticals (specialty food, craft, precision manufacturing), NI establishment has become a deliberate post-Brexit strategy.

6. Rules of Origin — The Key to Tariff-Free TCA Trade

Zero Tariff Is Conditional, Not Automatic

The TCA's headline promise — zero tariffs, zero quotas — applies only to goods that meet the agreement's preferential rules of origin (RoO). The default position for any other UK-EU shipment is the Most-Favoured-Nation (MFN) tariff, which the EU applies under the Common External Tariff and the UK applies under its UK Global Tariff schedule. MFN rates run from 0% on most raw electronics to 12% on consumer apparel and as high as 25% on certain dairy.

The "Originating" Test

A product is "originating" under the TCA if it is:

1. Wholly obtained in the UK or EU (e.g. a vegetable grown in Lincolnshire, fish caught in the North Sea), or
2. Produced from non-originating materials that have undergone "sufficient processing" in the UK or EU, defined product-by-product in Annex ORIG-2 to the TCA.

Sufficient processing tests typically take one of three forms:

• Change in tariff classification — the finished good must be in a different HS heading from the imported materials
• Value rule — non-originating materials cannot exceed a set percentage of ex-works price (commonly 40-50%)
• Specific process rule — particular operations must occur (e.g. weaving from yarn, not just sewing)

How to Claim Preference

To claim zero-tariff treatment under the TCA, the importer needs one of two documents:

• Statement on Origin — a short standardised text on the commercial invoice signed by the exporter; this is the most common route for B2C and SME B2B
• Importer's Knowledge — the importer self-declares based on their own records that the goods qualify; useful for repeat shipments from known suppliers

The Statement on Origin uses prescribed wording referencing the TCA. The exporter must hold supporting evidence (bills of materials, supplier declarations, calculations) for at least four years, available on request from HMRC or the EU customs authority.

The "Bonded Goods Trap"

A common pitfall: goods imported from China to a UK warehouse, then re-exported to the EU, do not qualify for TCA preference. Simple repackaging, sorting or relabelling does not confer UK origin. The MFN tariff will apply on the EU side, often eliminating the margin on otherwise-attractive cross-border drop-shipping. Sellers running this model from the UK must factor the duty into their landed cost and disclose it clearly to EU buyers — or restructure to ship direct from a Chinese exporter to an EU-side bonded warehouse.

7. UKCA Marking, CE Recognition & Product Conformity

The Original Plan: UKCA Replaces CE

When the UK left the single market, the government introduced the UK Conformity Assessed (UKCA) mark as the new conformity-assessment regime for goods placed on the Great Britain market. The original plan, announced in 2020, required all regulated products to bear UKCA marking from 1 January 2022, with CE marking no longer recognised after that date.

Reality: Endless Extensions, Then Indefinite CE Recognition

The deadline was extended four times — to 2023, then 2024, then 2026 — as industry made clear that switching to UKCA-only would create supply-chain disruption out of proportion to the regulatory benefit. In August 2024, the government announced that CE marking will continue to be accepted in Great Britain indefinitely for most regulated product categories, alongside UKCA. UKCA remains a valid mark but is no longer mandatory.

What This Means in Practice for E-Commerce

• Most consumer electronics, toys, EMC equipment, machinery — CE is fine for the GB market; UKCA is optional
• Construction products — separate UKCA (or UK CA Marking via CPR) regime continues, with its own deadlines
• Medical devices — MHRA-administered regime; current CE-based recognition extended to 2028-2030 depending on device class
• Northern Ireland — continues to use CE (for EU single-market goods) and UK(NI) marking (for goods assessed by a UK conformity assessment body but placed on the NI market)

Sellers' Practical Checklist

• Keep your existing EU Declaration of Conformity on file — it is valid in GB
• Ensure the responsible person address on the product / packaging includes a UK address for products requiring a UK responsible person (toys, machinery, PPE — check the Office for Product Safety and Standards (OPSS) guidance)
• For Northern Ireland sales, double-mark (CE + UK(NI)) where you have used a UK-based assessment body
• For your own UK-manufactured goods, you can choose UKCA-only, CE-only, or both — both is most common to keep cross-border simple

8. Amazon UK FBA & Cross-Border Implications

The Pan-EU FBA Split of January 2021

Before Brexit, Amazon's Pan-European FBA moved inventory automatically between UK, German, French, Italian, Spanish and (later) Polish fulfilment centres to position stock close to demand. On 1 January 2021 Amazon split the programme: UK fulfilment centres and EU fulfilment centres became two independent stock pools, with customs declarations required for any inter-pool movement.

For sellers using FBA, this meant a choice: store stock in the UK only (and reach EU customers via European Fulfilment Network — EFN — with cross-border delivery time of 5-8 days), or store separate stock in EU FCs (faster delivery but doubled inventory commitment), or both.

European Fulfilment Network (EFN) Today

EFN remains the official Amazon route for serving EU customers from UK-warehoused stock (and vice versa). The trade-offs in 2026:

• Delivery time — 5-8 days for EFN cross-border, versus 1-2 days for local FBA
• Customs handling — Amazon coordinates the export and import declarations but charges a per-unit cross-border fee (typically £0.30-£1.20 depending on category)
• Buy Box impact — EFN listings often lose the Buy Box to local-stocked competitors on time-sensitive categories

The 2026 Best Practice: Dual Stock Pools

For serious cross-border sellers, the 2026 consensus is to hold two distinct stock pools: one in Amazon UK FBA (typically the Manchester / Tilbury / Doncaster cluster) for UK demand, and one in Amazon EU FBA (typically a German FC like LEJ1 / DUS3, or a Polish FC for low-cost storage). Pan-EU FBA within the EU pool then redistributes stock across DE, FR, IT, ES, PL, CZ — but no longer crosses the GB border.

VAT Implications of Storing Stock in UK FBA

• Overseas seller using UK FBA — UK VAT registration required from day one (no turnover threshold)
• UK-established seller using EU FBA — VAT registration required in each EU country where stock is stored (typically DE, FR, IT, ES, PL, CZ); Amazon's VAT Services can administer this, or sellers can engage their own EU fiscal representative
• UK→EU Pan-EU rebalancing — Amazon no longer auto-moves UK stock across the EU border

Amazon UK Marketplace Fees in 2026

Amazon UK referral fees follow the standard European structure:

Amazon UK Professional Seller subscription remains at £25 per month (excluding VAT). FBA storage and fulfilment fees rise sharply during the October-December peak period — factor a 15-25% peak premium into Q4 forecasts.

9. eBay UK Cross-Border & the Post-GSP World

The End of the Global Shipping Programme

eBay's Global Shipping Programme (GSP) was for over a decade the standard way for UK sellers to ship abroad: the seller dropped the parcel at a UK GSP hub (operated by Pitney Bowes), and eBay handled all international customs, currency conversion and last-mile delivery. In 2023-2024 eBay retired GSP in favour of a new architecture:

• eBay International Shipping (eIS) — for outbound from US sellers
• eBay International Standard / eBay Delivery — for UK outbound, in partnership with Royal Mail, Evri and DPD

What Changed in Practice

• Lower buyer fees — the new model typically reduces landed-cost markup by 10-20% versus the legacy GSP
• IOSS-flagged labels — for EU-bound parcels at or under €150, the eBay flow automatically uses eBay's IOSS number, removing import VAT friction
• Faster transit — direct UK→EU dispatch from the seller's address replaces the GSP hub detour, typically saving 2-3 days
• Seller risk — sellers are responsible for accurate commodity codes and customs data on the listing; eBay no longer absorbs incorrect-declaration risk

eBay UK Fees in 2026

eBay UK final value fees vary by category, with the standard band sitting at 12.8% + £0.30 per order (under the typical "Final value fee" structure that consolidates marketplace and PayPal-era fees into one). For Store subscribers (Basic, Featured, Anchor), final value fees discount to roughly 9-11% depending on tier. Cross-border orders carry an additional 1.0-1.5% international fee.

eBay UK + IOSS — A Seller's Friend

For small UK sellers exporting to EU customers, the post-2024 eBay Delivery flow with eBay's own IOSS registration is materially cheaper and simpler than registering for IOSS yourself. Trade-offs:

• Pro — no IOSS registration required for low-value EU sales; eBay collects and remits VAT
• Pro — single label, single carrier coordination, transparent landed cost for the buyer
• Con — locked into eBay's chosen carriers; no Direct Buyer relationship for outside-eBay marketing
• Con — eBay collects the fee on the landed price including VAT — model the margin carefully

10. Practical 2026 Compliance Checklist

Pin this checklist to your project board. It covers the minimum compliance posture for cross-border UK e-commerce in 2026.

Customs & Border

• Apply for and receive a GB EORI (3-5 working days via GOV.UK)
• If you trade NI, request an XI EORI when applying
• If you ship UK→EU as DDP importer of record, obtain an EU EORI (typically IE, NL or DE)
• Register with the UK Internal Market Scheme (UKIMS) if you move goods from GB to NI
• Map every SKU to its 6-10 digit HS / commodity code
• Document country of origin per supplier and per SKU
• Build a Statement on Origin template for TCA preferential claims
• Retain origin-supporting records for at least 4 years
• Choose your Incoterm per route (DAP vs DDP) and reflect it consistently on invoices, declarations and listings
• Use a CDS-aware customs broker or carrier integration (no more CHIEF; the Customs Declaration Service is mandatory)

VAT & HMRC

• Register for UK VAT if you exceed £90,000 turnover (UK-established) or if you store stock in the UK (overseas seller)
• Use Making Tax Digital (MTD)-compatible accounting software with digital links to source records
• For UK→EU B2C under €150, register for IOSS directly or via an intermediary
• For EU→UK B2C under £135, collect UK VAT at point of sale or rely on the marketplace under Section 5A VATA 1994
• Set quarterly reminders for VAT return submission (MTD windows: 7th of the second month after the quarter end)
• If selling from UK FBA into the EU, register for VAT in each EU country where stock is held (or use Amazon's VAT Services)
• Reconcile marketplace VAT collected reports against your own GL monthly

Product Conformity

• Confirm CE marking is sufficient for your product family in GB (true for most consumer electronics, toys, machinery)
• If you sell construction products, medical devices or PPE, check the specific OPSS / MHRA guidance for current marking obligations
• Update product labels with a UK responsible person address where required (typically toys, machinery, PPE, cosmetics)
• Keep EU Declarations of Conformity and supporting test reports on file for 10 years (or as your product directive specifies)
• For NI, double-mark (CE + UK(NI)) where you have used a UK conformity assessment body

Marketplaces & Fulfilment

• Choose your stock topology: UK-only, EU-only, or dual stock pools
• If using Amazon UK FBA, ensure your seller account is configured for UK VAT, GB EORI and your CE / UKCA records
• For Pan-EU FBA on the EU side, register VAT in each storage country (or use Amazon VAT Services)
• If using eBay UK, opt into eBay International Standard / eBay Delivery for low-friction cross-border
• Integrate IOSS into every checkout for EU-bound B2C under €150 (or rely on the marketplace)
• Connect carrier APIs (Royal Mail, DPD, Evri, FedEx, UPS) for label generation and tracking

Consumer Protection

• Honour the 14-day cooling-off period under the Consumer Contracts Regulations 2013
• Honour the Consumer Rights Act 2015 (satisfactory quality, fit for purpose, as described)
• Publish terms & conditions, returns policy, complaints handling, and accessible ADR information
• UK GDPR compliance — appoint a representative if required, publish a clear privacy notice, maintain a record of processing activities

Post-Brexit UK E-Commerce FAQ 2026