The European Commission has updated its Carbon Border Adjustment Mechanism (CBAM) Questions and Answers on 15 October 2026, clarifying how emissions data, production records and verification arrangements must support compliance under the definitive regime. The update covers verified precursor emissions, allocation of identical goods between export markets, treatment of inventories manufactured before 2026, and outsourcing of technical verification activities.
The Commission’s clarifications increase the focus on whether emissions information can be traced through the supply chain. For manufacturers and EU importers, calculating tonnes of carbon dioxide equivalent is not sufficient when the underlying data cannot be linked to the relevant production process and backed by appropriate verification.
Verified precursor emissions and supplier due diligence
Manufacturers producing complex goods must establish a defensible verification chain when their products include precursors made by other companies. For steel, aluminium and other CBAM-covered goods, downstream operators are not able to rely solely on unverified supplier emissions figures when using actual emissions values.
The information used for compliance must be traceable to the relevant precursor production and supported by the required verification arrangements. This links precursor suppliers, downstream manufacturers and independent verifiers within the compliance process.
EU importers are therefore expected to extend supplier due diligence beyond collecting a single emissions figure. They need to identify which company produced the precursor, which installation and reporting period the data cover, whether the emissions value has been independently verified, how production volumes were allocated, and whether the verifier’s accreditation scope covers the relevant process.
Allocation of identical goods across export markets
The Commission’s guidance also addresses how emissions should be allocated between goods intended for different markets. Operators cannot create a preferential low-carbon export stream by assigning identical output from the same production process to different accounting categories.
Where identical goods are produced in one process, separating one batch for the EU market from another for non-EU destinations requires both physical and evidential support. Accounting distinctions alone cannot justify treating one group as lower-emissions output while treating another group as higher-emissions output.
The clarification affects manufacturers seeking to show different emissions intensities across export consignments. Production records and allocation methods must support any claimed distinction rather than relying only on administrative categorisation.
Pre-2026 inventories and the customs event trigger
The updated Questions and Answers clarify how inventories manufactured before the definitive CBAM regime began are treated. Goods produced in 2025 can fall under CBAM when they are released for free circulation in the EU during 2026.
Whether the definitive regime applies depends on the relevant customs event. The manufacturing date and the date of the sales contract do not override the date on which goods are released for free circulation.
This distinction is relevant for companies holding pre-2026 inventories intended for later delivery to EU customers. Goods manufactured before the start of the definitive regime may still be subject to its requirements when the relevant customs event occurs in 2026.
Outsourcing technical verification under accredited verifier responsibility
The Commission’s clarification sets out a controlled approach to outsourcing certain technical tasks within verification activities. Accredited verifiers may outsource eligible activities, including to organisations operating in third countries, while remaining responsible for the verification process.
The outsourcing arrangement does not cover either the technical review or issuance of the final verification report. Those responsibilities remain with the accredited verifier.
For industrial operators and technical advisers, this defines where external support ends and where responsibilities must stay with the accredited verification body. It also makes the verifier’s accreditation scope and responsibility for the final outcome central to assurance arrangements.
Data governance demands for Southeast European producers
The clarifications are relevant to Southeast Europe, where industrial installations depend on EU customers, external verification services, and emissions information supplied by other companies in the production chain. Compliance requires coordination between installation-level records, precursor data, production allocation and verification documentation.
Manufacturers need to demonstrate not only that emissions can be calculated accurately, but also where data originated, which production it represents, and how it was validated. The Commission’s 15 October 2026 guidance places supplier traceability and verification arrangements at the centre of using actual emissions values.
Producers and importers are expected to maintain records that establish a complete evidence chain behind CBAM calculations. This runs from precursor production and allocation through to independent verification.