European Commission Publishes Guidance Documents for the CBAM Definitive Period
On 14 August 2026, the European Commission (the Commission) published ten guidance documents relating to the definitive period of the Carbon Border Adjustment Mechanism (CBAM), which commenced on 1 January 2026.
The guidance documents are of an explanatory nature. They aim to support stakeholders by explaining the requirements of the CBAM Regulation in non-legislative language, with a specific focus on clarifying the requirements for operators of installations producing CBAM goods outside of the European Union (EU) during the definitive period.
The main topics addressed in the guidance documents are summarized below:
Guidance Document 1: Introduction to CBAM Concepts
Guidance Document 1 provides an overview of the main changes to the CBAM methodology between the concluded transitional period and the definitive period and presents a general framework for the operation of CBAM. It covers the CBAM compliance cycle, the roles and responsibilities of the parties involved, key milestones and deadlines for operators of installations outside the EU, and the general exemptions from CBAM. It further explains that the number of CBAM certificates to be surrendered is calculated by reference to (i) the embedded emissions of the imported goods, (ii) the adjustment for free allocation under the EU Emissions Trading System (EU ETS), and (iii) where applicable, any carbon price effectively paid in the country of production. It also sets out the de minimis exemption, under which importers are exempt from CBAM obligations where the aggregate net mass of all CBAM goods imported by the same importer in a given calendar year does not exceed 50 tones, and notes that this exemption does not apply to imports of electricity or hydrogen.
Guidance Document 2: Quick Guide for Non-EU Operators on CBAM Implementation
Guidance Document 2 provides a roadmap for operators of installations producing CBAM goods outside the EU. It summarizes the key concepts relating to the monitoring and reporting of emissions and the principal steps to be followed, with cross-references to the more detailed guidance available elsewhere in the series. It also addresses in detail the steps for designing and implementing a monitoring plan, which operators are required to submit in English.
Guidance Document 3: CBAM Methods for the Calculation of Emissions Embedded in Goods
Guidance Document 3 sets out in detail the methodology for monitoring, calculating and reporting emissions embedded in goods produced within the scope of CBAM. It covers the monitoring and reporting obligations applicable to operators of installations, as well as the methods and recommendations available, and addresses the changes between the methodology applied during the transitional period and that applicable during the definitive period. It further provides that monitoring records and supporting documentation maintained by operators of installations must be retained for at least six years after the end of the reporting period and that embedded emissions must be verified by an accredited verifier before being used in a CBAM declaration. Where an operator of an installation is unable to provide verified actual emissions data, the authorized CBAM declarant may use default values set by the Commission.
Guidance Document 4: CBAM Calculation of the Free Allocation Adjustment to the Number of CBAM Certificates to be Surrendered
Guidance Document 4 explains how the adjustment for free allocation under the EU ETS is to be calculated, the information required for this purpose, and how the adjustment is considered in determining the number of CBAM certificates to be surrendered.
Sector-Specific Guidance Documents
Guidance Documents 5a, 5b, 5c, 5d, 5e and 5f address the sector-specific rules applicable to the cement, hydrogen, fertilizers, iron and steel, aluminum and electricity sectors, respectively. The sector-specific guidance documents explain the CBAM goods falling within the scope of the relevant sectors and their production processes, the system boundaries of the production processes and the relevant precursors, as well as the sector-specific emissions monitoring and reporting requirements; these explanations are supported by worked examples.
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