The EU Combined Nomenclature (CN) – What It Is and What HS 2028 Changes
The Combined Nomenclature (CN) is the EU’s system for classifying goods. It is one of the most important datasets in international trade, requiring regular review – especially as HS 2028 approaches.
Contents:
- What is the combined nomenclature?
- How CN codes are structured
- How the combined nomenclature operates in practice
- The annual update cycle
- HS 2028 — what changes and when
- Why accurate application of the combined nomenclature is essential
- How Customs Support Group can help
What Is the Combined Nomenclature?
The Combined Nomenclature (CN) is the EU’s extension of the Harmonised System (HS) – the global customs classification standard developed by the World Customs Organisation (WCO). Every product crossing an EU border is assigned a CN code – a numerical identifier that helps to determine applicable import duty, controls, and statistical reporting requirements.
Whilst the HS covers the first six digits of every code, the EU adds two further digits to create CN codes. This extension provides additional specificity for EU tariff and trade policy purposes.
How CN Codes Are Structured
A CN code is eight digits long. The first six digits identify the HS chapter, heading, and subheading, with the final two digits indicating the EU’s subdivisions. These final two are the ones that the European Commission updates every year.
However, your commodity code may not stop at the CN code. For example, you need a 10-digit, or longer, code during import clearance – depending on your goods and their rules.
(Related: Classifications 101)
How the Combined Nomenclature (CN) Operates in Practice
The CN code sits at the centre of every customs declaration submitted to EU authorities.
For importers, along with customs origin, it determines:
- The import duty rate
- Whether trade measures such as anti-dumping duties or safeguard quotas apply
- What statistical data is required
For exporters, the CN code appears on export declarations and the export accompanying document (EAD
For businesses operating across multiple EU member states, the CN provides a common reference that aligns customs obligations across all jurisdictions. Inconsistencies in classification between entities or shipment types for the same goods can create audit exposure extending back several years.
An incorrect code can result in under- or over-payment of duty, rejection of preferential origin claims, or adverse findings under customs audit. In many cases, the exposure accumulates silently across multiple shipments before it is identified. This is why it is essential to have specialist help when classifying your goods.
(Related: The Five Best Practices for Product Tariff Classification)
The Annual Update Cycle
The European Commission updates the CN annually, publishing the revised version in the EU Official Journal ahead of the 1st of January. Each update reflects EU trade policy changes, structural reclassifications, and periodic alignment with the Harmonised System.
For businesses, this annual cycle means classification decisions cannot be treated as permanent. A code applied correctly in January 2025 may be invalid by January 2026 – with goods merged, split, or reassigned to a different heading.
(Related: Five Common Tariff Classification Pitfalls – and How to Avoid Them)
Therefore, each new CN release requires a structured review of product databases, ERP system entries, and supplier declarations. Businesses that rely on static classification data between updates carry misclassification risk that compounds with each shipment.
This is where Customs Support Group’s specialists excel. Our teams work with businesses across Europe to get global and local expertise, with deep general and industry-specific expertise available. Contact us for more information.
HS 2028 — What Changes and When
The World Customs Organisation (WCO) has accepted the HS 2028 amendments, which take effect on the 1st of January 2028. The package comprises 390 sets of changes across 98 HS headings – the most significant revision since HS 2022.
Because the combined nomenclature is built on the HS, every change to an affected HS heading integrates directly into the EU’s eight-digit code structure. Businesses whose products fall under those headings will need to reclassify.
That reclassification must then flow through every system, declaration, and supplier document that carries the old code – including ERP entries, binding tariff information (BTI) applications, and long-term supplier declarations (LTSDs).
In practice, the areas of change span public health equipment, pharmaceutical classifications, delivery suppressants, and goods under the circular economy framework. Whilst no single sector is unaffected, manufacturers, life sciences businesses, and automotive supply chains face the most concentrated restructuring.
The transition window is shorter than it appears. Classification decisions, BTI eligibility, and preferential origin determinations will all be made on a structure that customs authorities stop recognising after the 31st of December 2027.
(Related: HS 2028: The Classification Risk Building in Your Product Database Now)
Why Accurate Application of the EU Combined Nomenclature is Essential
An incorrect CN code does not always trigger an immediate alert. It continues to be applied across multiple shipment cycles before a customs authority identifies the discrepancy – and the liability is then calculated retrospectively across every affected declaration.
For businesses with complex product ranges, HS 2028 is a reclassification programme – not a one-off correction. Each affected code must be reviewed against the new heading structure, validated for origin eligibility, and confirmed against applicable trade measures before the deadline.
The financial exposure is not negligible. Incorrectly classified goods imported after the 1st of January 2028 under superseded CN codes can cause delays at the border in the short term. Over the long term, quietly building exposure can attract retrospective duty liability, penalties, and the administrative cost of remediation across supplier and customer documentation.
For procurement and supply chain teams managing sourcing across multiple origins and product categories, this is a gap that cannot be addressed through periodic lookups. It requires a structured approach to classification governance, which must be built before HS 2028 takes effect.
How Customs Support Group Can Help
Customs Support Group provides practical classification support to businesses, and is actively helping those businesses prepare for the HS 2028 transition with:
- Classification database review and remediation against the current CN
- HS 2028 impact assessment across your full product range
- BTI application support and transition planning
- ERP and product database updates following CN reclassification
- Audit-ready classification infrastructure that supports defensibility under scrutiny
- Ongoing classification governance to prevent errors from accumulating between annual CN releases
It all begins with a customs compliance scan, where our experts assess your classification position and return actionable insights on where exposure sits and what needs to change before HS 2028 arrives. Contact our team to begin safeguarding your compliance today.
