Key Takeaways
- CHIEF is gone: all UK import and export declarations must now be filed through the Customs Declaration Service (CDS), which demands more data elements and tighter accuracy than its predecessor.
- HMRC’s Get Customs Data service became the free replacement for paid declaration reports by the end of March 2026, making regular trader-led checks much easier.
- The Customs (Miscellaneous Amendments) Regulations 2026 take effect on 30 June 2026, recognising digital carnets as valid declarations and extending bulk declaration arrangements for postal packets.
- Digital ATA carnets (eATA) launched on 1 June 2026 across the UK, EU, Norway, and Switzerland, letting travellers and freight operators present carnets via a smartphone app.
- UK CBAM, new excise rules, and EU pre-arrival security requirements mean digital readiness in 2026 is the foundation for compliance in 2027 and beyond.
The Digital Baseline: CDS Is Now Mandatory
If you still think of CHIEF as the UK’s customs backbone, the ground has shifted beneath you. HM Revenue and Customs (HMRC) completed the move to the Customs Declaration Service (CDS) for imports in September 2022 and for exports in June 2024, making CDS the sole platform for UK customs declarations. According to the GOV.UK Customs Declaration Service collection, every standard declaration, supplementary declaration, and many simplified procedures now flow through CDS, and the old Customs Handling of Import and Export Freight (CHIEF) system has been fully decommissioned.
The practical impact is more than a different login screen. CDS uses a more detailed data model than CHIEF. Traders must supply the correct commodity codes, precise customs values, country of origin, and supporting document references. Errors that might have slipped through under CHIEF are more likely to trigger query messages, delays, or post-clearance checks. For any business that files its own declarations, this means the quality of master data, product records, and supplier information is now a compliance issue, not just an administrative one.
CDS also changes the relationship between traders and their customs agents. Because the system exposes declaration data back to the trader through Government Gateway, you can see exactly what your broker submitted in your name. That visibility is useful, but it also means you can no longer treat customs as a black box managed entirely by a third party. If the data is wrong, HMRC will hold the importer or exporter accountable, even if a broker keyed it in.
Free Data Access Means Higher Expectations
A quieter but equally important transition finished in March 2026: HMRC’s free Get Customs Data service replaced the old paid MSS and CDS data reports. HMRC first launched the self-service portal in November 2025; by 31 March 2026 the paid route had closed. Businesses can now pull the declaration information HMRC holds without paying a report subscription. The change sounds like a cost saving, and it is, but its real significance is a shift in responsibility.
When HMRC gives you the same data it sees, it expects you to act on it. That means checking duty calculations against your commercial invoices, confirming that commodity codes match your product specifications, and flagging anomalies before they become compliance letters. In practice, a monthly or quarterly reconciliation between your customs data and your purchase or sales ledger should become routine. The businesses that treat this as a finance or compliance task, not a logistics afterthought, will avoid the penalties that often follow repeated errors.
The data is also a useful negotiating tool. If you can demonstrate a pattern of accurate declarations and timely submissions, you have stronger grounds when applying for Authorised Economic Operator (AEO) status or when asking HMRC for simplified procedures. Conversely, if the data shows repeated mistakes, HMRC has the evidence it needs to refuse those concessions or to inspect more shipments. Access to your own data turns customs compliance from a retrospective guessing game into a forward-looking control process.
The 2026 Regulatory Wave
The Customs (Miscellaneous Amendments) Regulations 2026 come into force on 30 June 2026 and make several technical but important changes. GOV.UK’s published guidance confirms that the regulations recognise digital carnet documents as customs declarations in their own right, update interest calculation rules for unpaid customs duties, and extend bulk customs declaration arrangements for postal packets. They also give HMRC the power to require port operators to provide off-site customs facilities where port space is insufficient, which matters for roll-on, roll-off ports and busy container terminals.
These changes share a single theme: the border is becoming more digital and more conditional. A declaration is no longer just a form submitted to a government computer; it is part of a wider data picture that includes the port, the carrier, the warehouse, and the trader’s own systems. When port operators can be directed to provide customs examination space off the quay, the physical and digital borders move closer together. Importers and exporters need to track both.
For operators, the immediate action is to review declaration procedures with their broker or software provider before 30 June. Check whether your customs software has been updated for the new interest rules and whether your processes still assume paper carnets are the only valid form. If you move goods through postal channels, confirm that your declarations are captured under the extended bulk arrangements or whether you need a separate procedure. Small assumptions left unchanged can become errors after a statutory instrument takes effect.
Digital ATA Carnets: What Changes in June 2026
On 1 June 2026, the UK joined the EU, Norway, and Switzerland in accepting digital ATA carnets. GOV.UK guidance updated in June 2026 explains that traders can now use an electronic ATA carnet, or eATA, through a smartphone app, with desktop access available for freight forwarders and high-volume users. The digital carnet has the same legal status as a paper carnet under the amended regulations, and customs officers can verify it by scanning a QR code or checking the digital record.
ATA carnets are used for temporary admissions: goods such as exhibition stands, professional equipment, samples, and sports kit that enter a country without payment of duty because they will leave again. For businesses that tour trade shows, send demonstration equipment abroad, or move goods for repair, the switch to eATA removes the risk of losing or damaging a paper document. It also reduces the time spent at borders searching for the right stamp or counterfoil.
The practical roll-out is not instant, however. Some customs posts may still be learning the new verification process, and travellers should keep both paper and digital options in mind during the transition. Chambers of commerce, which issue ATA carnets in the UK, have published guidance through bodies such as the London Chamber of Commerce and Industry (LCCI) on how to apply for and manage digital carnets. If your business relies on temporary admission, now is the time to register for the digital service and to brief staff on how to present the carnet at each border.
The EU Border Dimension
UK traders cannot think about digital customs in isolation. The EU is running its own parallel modernisation, and goods crossing the Channel or the Irish Sea are caught in both systems. ICS2 Release 3 became fully operational for all transport modes in September 2025, so road, rail and maritime operators are working under its pre-arrival safety and security data requirements throughout 2026. This means more detailed product descriptions, earlier data submission, and a higher chance that errors or omissions will cause delays or intervention.
Further ahead, the EU Customs Data Hub is the bloc’s long-term vision for a single submission point and centralised risk analysis. Its first major deployment is planned for low-value e-commerce from July 2028, with a wider rollout following in later phases. Pilot work and national implementations are already shaping what data traders need to collect. UK businesses that maintain clean, structured product and shipment data will find the transition easier; those still working from spreadsheets and email attachments will struggle.
Looking Ahead: CBAM, Excise, and Parcel Rules
Digital customs compliance in 2026 is best understood as preparation for 2027. The UK Carbon Border Adjustment Mechanism (CBAM) begins on 1 January 2027, covering specified goods in the aluminium, cement, fertiliser, hydrogen, and iron and steel sectors. Importers must identify CBAM-relevant commodity codes and collect data on embedded emissions. The first accounting period covers the whole of 2027; quarterly accounting begins in 2028. Data collection therefore starts well before the first return is due, which means systems and supplier questionnaires need to be in place during 2026. Our guide to UK CBAM covers the commodity scope and reporting timeline in more detail.
Excise rules are also tightening. The EMCS 4.2 update to the Excise Movement and Control System took effect on 12 February 2026, and warehouse keepers handling excise goods must be on the updated system. Separately, the Vaping Products Duty starts on 1 October 2026 at £2.20 per 10ml of vaping liquid, with mandatory duty stamps carrying digital traceability. From April 2027, unstamped vaping products will be illegal. These are not customs duty changes in the traditional sense, but they show the same pattern: more digital tracking, more upstream data, and tighter enforcement.
For e-commerce and parcel operators, the EU’s temporary €3 customs duty on each distinct item category, based on tariff classification, began on 1 July 2026 for consignments worth up to €150. The measure removes the previous duty exemption until the permanent arrangement is introduced, currently planned for July 2028. While this is an EU measure, it affects UK businesses shipping small consignments into the EU. UK parcel shippers should review their customs data capture because EU systems expect accurate product descriptions, classifications, and values at submission.
What Digital-Ready Looks Like
Digital-ready customs compliance in 2026 has four parts: software, data, audit trails, and relationships. On software, the baseline is a declaration platform or broker connection that is fully CDS-compliant and updated for the June 2026 regulatory changes. If you use a freight forwarder or customs broker, ask for written confirmation that their system is ready and ask how they will pass declaration copies back to you for reconciliation.
Data quality is the next pillar. Every product in your catalogue should have a confirmed 10-digit commodity code, a clear country of origin, and an agreed customs value methodology. If your goods qualify for preferential tariff treatment under a UK trade agreement, you need supplier declarations and origin evidence stored and retrievable. Businesses that have already secured an EORI number and understand their import duty position will find this stage easier; those without those foundations should fix them first.
Audit trails matter because HMRC increasingly expects traders to demonstrate how decisions were reached. A classification choice, an origin calculation, or a valuation method should be documented at the time the declaration is made, not reconstructed months later during a post-clearance enquiry. A simple shared folder, version-controlled spreadsheets, or a dedicated compliance module can be enough, provided the trail is consistent and complete.
Finally, relationships. Customs compliance is no longer a single transaction at the border; it runs through your supply chain. Talk to suppliers about origin evidence and emissions data. Talk to carriers about pre-arrival notification requirements, especially for EU movements. Talk to brokers about what they can see in CDS and what you should be checking yourself. The businesses that treat customs as a supply-chain conversation, rather than a port-side paperwork task, will adapt to the digital border far more smoothly.
Frequently Asked Questions
What is the Customs Declaration Service (CDS)? CDS is HMRC’s electronic system for handling UK import and export customs declarations. It replaced CHIEF for imports in September 2022 and for exports in June 2024. CDS requires more detailed data than CHIEF and is now the only platform for standard UK customs declarations.
Do I need special software to use CDS? You can file directly through HMRC’s online services if your declaration volume is small, but most traders use commercial customs software or a customs broker. The key requirement is that the software is CDS-compatible and kept up to date as HMRC changes data rules. Our customs clearance guide explains the declaration steps in detail.
What changed in March 2026 for customs data access? HMRC launched Get Customs Data in November 2025, and it became the free replacement for paid MSS and CDS reports by the end of March 2026. The service lets businesses reconcile customs records against their own invoices and ledgers without a report subscription.
What is an eATA carnet and who needs one? eATA is the digital version of the ATA carnet, used for temporary admission of goods such as exhibition equipment, samples, and professional tools. From 1 June 2026, the UK, EU, Norway, and Switzerland accept digital carnets presented via a smartphone app. Businesses that regularly move temporary goods across these borders should register for the digital service.
Does the UK CBAM require digital reporting? Yes. UK CBAM starts on 1 January 2027 and requires importers in scope to report data used to calculate embedded emissions and liability. The first accounting period is the 2027 calendar year; quarterly accounting begins in 2028. Traders should start collecting structured supplier data during 2026.
How should importers prepare for EU ICS2 Phase 3? Importers should ensure that carriers and suppliers submit complete, accurate safety and security data well before goods arrive in the EU. This includes detailed product descriptions and correct commodity codes. Late or inaccurate data is more likely to trigger EU customs intervention and delays.