The proposed downstream extension of the Carbon Border Adjustment Mechanism (CBAM) could bring carbon compliance closer to finished industrial products, shifting responsibilities from primary metal producers toward manufacturers of machinery, equipment and components. From 2028, companies exporting products to the EU could become directly subject to CBAM if their product codes are included in the final legislation, even when those products are made from steel already covered by the mechanism.
The proposed expansion remains separate from current obligations
The European Commission has proposed extending CBAM to 180 downstream steel- and aluminium-intensive products, while the positions adopted by the Council of the EU and the European Parliament envisage broader coverage. The policy objective is to reduce the risk of production relocating from the EU to jurisdictions with lower carbon costs, particularly where basic metals remain subject to the mechanism but downstream manufacturing does not.
The final product list and calculation methodology remain under negotiation. Companies should therefore distinguish between the legislation governing 2026 imports and the possible requirements of a future downstream extension. The Commission proposal and the positions of the Council and Parliament can inform scenario analysis, investment planning and contract drafting, but should not be treated as binding requirements for current declarations before the amending legislation takes effect.
A two-scenario approach can support preparation without assuming that proposed changes are already law. One model should reflect current CBAM requirements, while a second should estimate exposure under a potential reform. This allows businesses to prepare data systems and optional contractual provisions without basing their present compliance position on an unsettled legislative outcome.
Machinery manufacturers face a different data challenge
For a machinery plant, the challenge differs from that of a steel mill. A manufacturer may purchase dozens or hundreds of steel components from multiple suppliers, with the embedded emissions of those materials potentially outweighing the plant’s own direct emissions.
If downstream products enter the CBAM framework, compliance would require more than monitoring fuel consumption and emissions at the manufacturing site. Companies would need reliable bills of materials, supplier information, emissions values and consistent allocation methods linking covered inputs to finished product families.
Manufacturers should be able to identify the quantities of covered steel used in each product family, the installations supplying those materials and the relevant emissions data. Where the same precursor contributes to several outputs, allocation must follow a consistent, auditable methodology. Enterprise resource planning (ERP) systems and procurement master data would become important components of monitoring, reporting and verification (MRV), particularly for high-volume standardised components.
Product-level accounting can clarify investment decisions
Steel producers and downstream manufacturers should assess carbon costs at the product and production-process level rather than relying exclusively on corporate-average targets. Under CBAM methodology, improvements within the regulated boundary may affect the calculated liability, while other decarbonisation measures may improve a product’s wider environmental performance without producing the same immediate effect on CBAM costs.
A documented link between an engineering measure and its potential certificate impact can help management compare investments. Some measures may reduce current border-adjustment costs, while others may lower energy expenditure, improve the broader product carbon footprint or reduce future transition risks. These benefits should be assessed separately to avoid double-counting the same emissions reduction.
The distinction matters when companies compare production routes, suppliers and capital expenditure. A lower corporate emissions figure does not automatically establish a corresponding reduction in the CBAM liability for every product.
Supplier choices could reshape make-or-buy decisions
A downstream extension could change the relative economics of manufacturing inside and outside the EU. European producers already facing carbon costs under the EU Emissions Trading System (EU ETS) may gain additional protection against imports of carbon-intensive components. However, non-EU manufacturers using lower-emission steel and supplying robust emissions evidence could remain competitive.
Reliance on default values may become a greater commercial disadvantage if applicable mark-ups increase from 2028. Suppliers with product-specific data and verifiable production records could be better positioned to demonstrate their emissions performance to EU customers.
For purchasing teams, the implications extend beyond the price of the finished component. Supplier selection may increasingly depend on the ability to substantiate the origin, quantity, production route and emissions of the steel incorporated into a product. Carbon data quality could therefore become part of supplier qualification and commercial negotiations.
Existing industrial records should underpin CBAM controls
Companies should use established industrial records wherever possible, including heat numbers, production orders, warehouse movements, fuel-meter readings and ERP material issues. A separate CBAM spreadsheet may be useful for calculations, but it should not become the sole record of how material quantities and emissions have been allocated.
The control system needs to connect reported figures to the underlying commercial and production evidence. This is particularly important when manufacturers rely on actual emissions values for specific precursors, because the verifier must be able to trace the claimed result through the relevant records and calculation methodology.
The same information should support purchasing, production, customs, finance and compliance functions. Maintaining disconnected datasets increases the risk that a change in supplier, production route, price or regulatory treatment will produce inconsistent figures across the business.
Western Balkan exporters face supply-chain exposure
Manufacturing across the Western Balkans is closely integrated with EU automotive, electrical equipment and machinery supply chains. Extending CBAM downstream could therefore affect a much wider group of exporters than primary steel and aluminium producers.
Companies with high metal content, narrow margins and customers able to switch suppliers quickly may be particularly exposed. Their preparation should begin with screening the relevant CN codes, ranking products by EU sales and metal intensity, and requesting CBAM-ready data from strategic steel suppliers.
Investment in data architecture can remain useful even if the final list of covered downstream products is narrower than proposed. EU customers are increasingly seeking comparable information through procurement requirements and product-carbon programmes, creating reasons to strengthen material traceability beyond the scope of any single regulatory change.
Evidence gaps should be addressed before reporting deadlines
A practical implementation test is whether a company can explain the same emissions result to a verifier and a commercial manager using the same underlying records. The minimum decision file should connect the CN code, precursor, process boundary, production record and verified emissions value, while identifying who approves each assumption.
The file should also define a documented fallback where the preferred accounting treatment cannot be substantiated. That alternative may be less commercially attractive, but establishing it in advance reduces the risk of discovering the actual exposure only after a verifier, customs authority or authorised CBAM declarant challenges the claim.
As the financial implications of CBAM develop through the decade, unresolved evidence gaps could become recurring costs. Clear records and controlled assumptions would also make price adjustments, changes to verification requirements and management reporting easier to substantiate.
The key planning question is whether exposure has been assessed before the relevant transaction or reporting period is finalised. Companies that can translate complex material bills into credible, traceable emissions evidence will be better equipped to manage supplier negotiations, demonstrate compliance and respond to changes in the regulatory framework.
