The European Commission has proposed extending the Carbon Border Adjustment Mechanism (CBAM) to a defined group of steel- and aluminium-intensive downstream products from 1 January 2028. The proposal would shift the policy debate beyond basic aluminium products to profiles, components and other manufactured goods containing significant amounts of embedded metal. For many processors, this could be more consequential than the initial 2026 scope, potentially bringing their own exports within the border mechanism rather than requiring only carbon information about upstream aluminium.
The Council and European Parliament have advanced broader positions, and the final list of Combined Nomenclature (CN) codes remains subject to interinstitutional negotiations. Companies are expected to distinguish preliminary exposure assessments from a legal determination that a particular product is covered.
Current CBAM duties versus proposed downstream reforms
For extruders, component manufacturers, facade companies, distributors and EU importers, preparation should not blur the line between current requirements and proposed reforms. The Commission proposal and the Council and European Parliament positions can be used for scenario analysis, supplier discussions and contract drafting. They should not be treated as operative requirements for current declarations before amending legislation takes effect.
A two-scenario model—one based on current law and another on a plausible reform scenario—can help management prepare necessary data. It also supports consideration of optional contractual clauses without relying on legislation that remains under negotiation.
Embedded emissions accounting for complex downstream products
Downstream aluminium products often include complex bills of materials that combine metal with glass, plastics, electronics, fasteners and other inputs. A central accounting challenge is identifying the relevant covered aluminium precursor and allocating its embedded emissions to the finished product under the eventual methodology. Meeting that requirement may require closer coordination among procurement, engineering and customs-classification teams than some processors currently maintain.
Manufacturers are also expected to separate statutory CBAM emissions from a broader product carbon footprint. The statutory figure is used for the border mechanism, while the product footprint can be influenced by electricity consumption, recycled content and other factors that do not necessarily map directly onto the current CBAM calculation.
Product carbon measures and precursor data requirements
Aluminium manufacturers and buyers need to assess two different carbon measures when evaluating commercial implications. Customers may assign value to both measures, but their financial implications are not interchangeable. A premium for genuinely lower-carbon aluminium should not automatically be presented as a direct CBAM saving.
Manufacturers should map precursor aluminium by supplier installation, CN code, quantity and product family. Where profiles or components incorporate non-CBAM materials, reliable bills of materials are needed to establish relevant metal content for future calculation. Companies should retain actual verified precursor emissions data wherever available to reduce reliance on less favourable default values when downstream reporting begins.
Traceability across precursor routes and supply-chain systems
A downstream extension could increase protection for EU producers exposed to carbon costs under the EU Emissions Trading System (EU ETS), while creating new compliance expenses for non-EU manufacturers. Processors using lower-carbon aluminium may remain competitive if they can substantiate relevant data. Suppliers lacking reliable information could face higher delivered costs in the EU market even if their own fabrication processes have relatively low emissions.
The assurance trail is expected to connect precursor metal, its production route and final product classification. Aluminium manufacturers already maintain detailed alloy specifications and quality records that could support CBAM compliance if installation identities and emissions information are integrated consistently.
The main control weakness may be fragmented rather than missing data. Procurement, production, customs and sustainability systems can describe the same material differently. A shared master-data model can help reconcile these records and maintain a consistent account of the product throughout the supply chain.
Exposure assessment for Western Balkan exporters
Serbia, Bosnia and Herzegovina, North Macedonia and Montenegro export aluminium profiles, construction products and components to the EU. The 2028 policy debate is therefore relevant to small and medium-sized enterprises that have not acted as direct CBAM declarants during the initial phase.
Companies should conduct a CN-code exposure assessment and compare their product lines with those appearing in competing legislative proposals. They should prioritise supplier-data collection for products most likely to be affected. Until final scope is adopted, preparation should focus on building reliable data and retaining flexibility rather than treating proposed coverage as settled law.
An evidence trail linking compliance files to commercial records
A practical implementation test is whether a company can explain its emissions result to both a verifier and a commercial manager using the same underlying records. The compliance file should connect purchasing, production, customs and finance rather than being maintained as a separate reporting exercise.
Routine operational data, controlled assumptions and documented fallback methods can allow responses to changes in suppliers, production routes, prices or legislation without rebuilding calculations. This approach can also support customer negotiations by enabling manufacturers to explain not only a carbon figure but the operational evidence supporting it and the conditions under which it could change.
The minimum decision file should link precursor route, product classification, material flow and verified installation data while identifying who approves each assumption. It should also document fallback treatment for cases where preferred approaches cannot be substantiated. Defining fallback in advance reduces risk of discovering actual exposure only after a verifier, customs authority or authorised declarant challenges a claim.
As CBAM’s financial impact grows, preventable evidence gaps risk becoming recurring carbon costs. A structured record can also make subsequent price adjustments, verification changes and management reporting easier to substantiate.
The centre of gravity of CBAM policy is moving from the smelter towards finished products. For aluminium processors, the proposed 2028 extension could make supply-chain carbon data a direct factor in EU market access through product classification, precursor traceability and coordinated compliance planning.