Navigating the European Union’s Carbon Border Adjustment Mechanism
An exporter’s technical guide
The European Union’s Carbon Border Adjustment Mechanism (EU CBAM) entered its definitive phase in January 2026, creating new costs and reporting considerations for exporters of CBAM-covered goods to the European Union. This technical guide focuses on steel and aluminum exporters and includes how CBAM costs are calculated, what verified emissions reporting requires, and how carbon prices paid in the country of origin can reduce CBAM liability.
Key Messages
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The EU CBAM definitive phase, which began in January 2026, ends the flexibility of the transitional reporting-only period and creates binding financial obligations for EU importers of covered goods, with direct commercial consequences for exporters.
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How much an importer pays under CBAM depends heavily on the quality of the exporter's emissions data. Companies that cannot provide verified data are assigned default values deliberately set high, with annual increases through 2028.
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Supply chain emissions data matters more than many exporters realize. Most steel and aluminum products require verified emissions data not only from the exporter's own production but also from input suppliers.
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Carbon prices effectively paid in the country of origin, including under a domestic emissions trading system, can be deducted from EU CBAM liability, avoiding double carbon pricing and rewarding domestic climate policy.
Since January 2026, the EU CBAM has moved from a reporting-only system to one that imposes binding financial obligations on EU importers of steel, aluminum, cement, fertilizers, hydrogen, and electricity. For exporters of these goods, the shift has significant commercial implications: the CBAM costs their EU buyers face depend heavily on the exporters' ability to report verified emissions. Exporters that cannot provide verified emissions data are assigned deliberately set default values that will increase further in 2027 and 2028. The first formal CBAM payment is not due until September 2027, but liability is building from every shipment made today. With CBAM's likely expansion to new sectors in coming years, the scope will widen.
This technical guide breaks down what exporters need to know about CBAM: how costs are calculated, what verified emissions reporting requires, and how carbon prices paid in the country of origin can reduce CBAM liability. The guide is designed as a practical reference that can be read as a step-by-step overview or consulted selectively by topic. By explaining the full range of compliance considerations and cost drivers, the guide aims to help exporters understand their exposure, engage more effectively with EU buyers, and identify opportunities to reduce costs through better emissions data and domestic carbon pricing.
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