Manufacturers assessing their exposure to the proposed downstream expansion of the EU Carbon Border Adjustment Mechanism (CBAM) face a classification challenge before calculating potential carbon costs. The customs code assigned to an imported machine, metal assembly or construction component helps determine whether the product falls within the mechanism, making accurate classification essential for both current compliance and future planning.
CBAM already covers selected processed steel and aluminium products. Certain fasteners, structures, tanks and other fabricated goods cannot be assumed to be exempt simply because they have undergone further processing. Conversely, the presence of steel or aluminium in a finished product does not automatically bring that product within the mechanism.
Combined Nomenclature codes define product coverage
The starting point is the EU’s Combined Nomenclature (CN), the system used to classify imported goods. Manufacturers should reconcile the codes recorded on actual EU import declarations with their product specifications rather than rely on broad commercial descriptions such as automotive components, machinery or industrial equipment.
This distinction becomes more important as the downstream expansion progresses through negotiations. The European Commission, Council and European Parliament have proposed different product lists, meaning companies must distinguish goods already covered by existing rules from those appearing only in proposed legislative annexes.
An effective assessment should record the code used, the legal text and version against which it was checked, and the date of the assessment. This provides a clearer audit trail when legislation changes or customers request evidence supporting a supplier’s conclusions.
Mixed-material products complicate classification
Goods made from several materials can present particular difficulties. Two products serving similar purposes may receive different classifications because of differences in design, composition or principal function. At the same time, products falling under the same customs code may contain different proportions of steel or aluminium.
Customs classification and emissions attribution are related but separate exercises. The code helps establish whether a product is covered, while the applicable CBAM methodology determines how its embedded emissions and associated obligations are calculated.
Importers must also establish precisely what crosses the EU customs border. A complete machine, a replacement part and an unfinished assembly may fall under different classifications. Shipping arrangements and declarations must reflect the actual goods and applicable customs rules; artificial changes intended to avoid coverage can create additional enforcement risks.
A product-level exposure register supports procurement decisions
Manufacturers can improve their assessment by linking each export product to its import code, EU customer, annual sales volume and principal metal inputs. This creates a practical basis for distinguishing current CBAM exposure from potential costs under the proposed expansion.
Such a register can also reveal inconsistencies where different customers classify apparently identical products differently. These discrepancies warrant investigation before they affect declarations, pricing or contractual negotiations.
Where classification remains uncertain, formal customs advice or a Binding Tariff Information (BTI) decision may provide a more reliable basis than an exporter’s commercial product description. Changes to product design, function or material composition should trigger a review if they could affect the applicable code or CBAM treatment.
Classification clarity matters for long-term contracts
Customs codes will also influence negotiations over the allocation of future carbon costs. A supplier cannot assess an unlimited CBAM-related cost clause properly without knowing which products it covers. Buyers need the same clarity when comparing landed costs and evaluating competing suppliers.
The risk is particularly significant for fixed-price contracts extending beyond the potential 2028 start date of the proposed downstream expansion. A manufacturer could discover after signing that a product was already covered by existing rules or that the final expansion captures a substantially larger share of its sales than anticipated.
Accurate classification therefore provides the foundation for credible CBAM exposure estimates, more precise contract terms and better-informed investment decisions. Before calculating a carbon liability, manufacturers need to establish exactly which goods they are selling and how those goods are classified under EU customs rules.
