EU Carbon Border Adjustment Mechanism (CBAM) assessments for manufacturers considering the proposed downstream expansion hinge on customs classification before carbon costs are calculated. The customs code applied to an imported machine, metal assembly, or construction component can determine whether the product falls within the mechanism.
CBAM already covers selected processed steel and aluminium products. Certain fasteners, structures, tanks, and other fabricated goods cannot be treated as exempt solely because they have undergone further processing. At the same time, the presence of steel or aluminium in a finished product does not automatically place that product within CBAM.
Combined Nomenclature codes as the basis for coverage
The starting point for determining whether goods are covered is the EU’s Combined Nomenclature (CN), which classifies imported products. Manufacturers are expected to reconcile CN codes shown on actual EU import declarations with product specifications rather than rely on broad commercial descriptions such as automotive components, machinery, or industrial equipment.
The classification challenge increases as negotiations on downstream expansion progress. The European Commission, Council, and European Parliament have proposed different product lists, requiring companies to separate goods already covered under existing rules from those that appear only in proposed legislative annexes.
An effective assessment records the customs code used, the legal text and version against which it was checked, and the date of the assessment. This documentation supports an audit trail when legislation changes or when customers request evidence for supplier conclusions.
Mixed-material goods and emissions calculations
Goods made from multiple materials can complicate classification. Products that serve similar purposes may be classified differently due to differences in design, composition, or principal function. Even where goods fall under the same customs code, they may include different proportions of steel or aluminium.
Customs classification and emissions attribution are linked but distinct processes. The customs code helps determine whether a product is covered, while the applicable CBAM methodology sets how embedded emissions and associated obligations are calculated.
Importers also need to establish what exactly crosses the EU customs border. A complete machine, a replacement part, and an unfinished assembly may be classified differently. Shipping arrangements and declarations must reflect the actual goods and applicable customs rules, since artificial changes intended to avoid coverage can increase enforcement risk.
Building internal registers and managing classification uncertainty
Manufacturers can strengthen assessments by linking each export product to its import code, EU customer, annual sales volume, and principal metal inputs. This approach supports distinguishing current CBAM exposure from potential costs under the proposed expansion.
A product-level exposure register can also identify inconsistencies when different customers classify apparently identical products differently. Such discrepancies require investigation before they affect declarations, pricing, or contractual negotiations.
When classification remains uncertain, formal customs advice or a Binding Tariff Information (BTI) decision may provide a more reliable basis than an exporter’s commercial description. Changes to product design, function, or material composition should trigger a review if they could affect the applicable code or CBAM treatment.
Contract implications ahead of a potential 2028 start
Certain contract terms depend on which products are covered by CBAM through customs codes. A supplier cannot assess an unlimited CBAM-related cost clause without knowing which products it covers, and buyers need similar clarity when comparing landed costs across suppliers.
The risk is particularly relevant for fixed-price contracts extending beyond a potential 2028 start date for downstream expansion. After signing, a manufacturer could find that a product was already covered by existing rules or that the final expansion captures a substantially larger share of sales than expected.
Accurate classification underpins credible CBAM exposure estimates and more precise contract terms. Before calculating carbon liability, manufacturers need to confirm which goods they sell and how those goods are classified under EU customs rules.