The European Commission’s 15 October 2026 update to its Carbon Border Adjustment Mechanism (CBAM) Questions and Answers clarifies how emissions data, production records and verification arrangements must support compliance under the definitive regime. The guidance covers verified precursor emissions, the allocation of identical goods between export markets, imports of pre-2026 production and the outsourcing of technical verification activities.
For manufacturers and EU importers, the update increases emphasis on traceability for emissions information across the supply chain. It states that calculating tonnes of carbon dioxide equivalent is not sufficient when the underlying data cannot be linked to the relevant production process and supported by appropriate verification.
Traceability requirements for verified precursor emissions
Manufacturers producing complex goods must establish a defensible verification chain when their products incorporate 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 Commission says the information must be traceable to the relevant precursor production and supported by required verification arrangements. This links precursor suppliers, downstream manufacturers and independent verifiers within the compliance process.
EU importers are expected to extend supplier due diligence beyond collecting a single emissions figure. The guidance indicates that they should 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.
Emissions allocation for identical goods across markets
The Commission’s guidance also addresses how emissions are allocated between goods intended for different markets. It states that operators cannot create a preferential low-carbon export stream by assigning identical output from the same production process to different accounting categories.
Where a process produces identical goods, separating one batch for the EU market and another for non-EU destinations requires a physical and evidential basis. The guidance says accounting distinctions alone cannot justify treating one group as lower-emissions output and another as higher-emissions output.
This clarification affects manufacturers seeking to demonstrate different emissions intensities across export consignments. It requires production records and allocation methods to support any claimed distinction rather than relying exclusively on administrative categorisation.
Treatment of inventories manufactured before the definitive CBAM regime
The updated Questions and Answers clarify how inventories manufactured before the definitive CBAM regime began are treated. It states that goods produced in 2025 can fall under CBAM when they are released for free circulation in the EU during 2026.
The guidance specifies that the relevant customs event determines whether the definitive regime applies. It also says that manufacturing date and the date of the sales contract do not override the date on which goods are released for free circulation.
The distinction is relevant for companies holding pre-2026 inventories for subsequent 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 on verification activities sets out conditions for outsourcing certain technical tasks. It states that 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 extend to technical review or issuance of the final verification report. Those responsibilities remain with the accredited verifier.
For industrial operators and technical advisers, this defines boundaries between external support and responsibilities that must remain with the accredited verification body. The guidance also makes clear that verifier accreditation scope and responsibility for final outcome are central to assurance.
Data governance implications for Southeast European supply chains
The clarifications apply to Southeast Europe where industrial installations depend on EU customers, external verification services and emissions information supplied by other companies in the production chain. In this context, compliance requires coordination between installation-level records, precursor data, production allocation and verification documentation.
The ability to calculate emissions accurately must be matched by evidence showing where data originated, which production it represents and how it was validated. The Commission’s guidance makes supplier traceability and verification arrangements central to using actual emissions values.
Producers and importers need records establishing a full evidence chain behind their CBAM calculations. This chain runs from precursor production and allocation through independent verification.