The CBAM forms part of the EU’s climate policy framework under the European Green Deal and the Fit for 55 package (Section 1.1). These initiatives aim to reduce net greenhouse gas emissions by at least 55% by 2030, relative to 1990 levels, and to support the transition towards climate neutrality by 2050. Within this framework, the CBAM complements the strengthening of the EU Emissions Trading System (EU ETS) by addressing the risk of carbon leakage. Carbon leakage may arise when more stringent climate policies increase production costs in regulated jurisdictions, leading production and associated emissions to shift to economies with less stringent policies. This risk is particularly relevant for emissions-intensive and trade-exposed sectors, such as iron and steel, cement, aluminium, fertilisers, electricity and hydrogen. Differences in carbon pricing across countries remain large, with the EU and its Member States among the jurisdictions applying relatively high explicit carbon prices.
The CBAM seeks to align the carbon cost of selected imports with the cost faced by EU producers under the EU ETS to reduce the risk of carbon leakage. It requires importers to report the embedded emissions of covered goods and, from the definitive period, to purchase and surrender CBAM certificates. Carbon prices effectively paid in the country of origin can be deducted, and the use of verified actual emissions is allowed. These design features aim to reflect differences in production processes and existing climate policies abroad, while supporting consistency with the EU’s international commitments.
The mechanism is being implemented in two phases (Section 1.2). The transitional period, from October 2023 to the end of 2025, served as a learning and preparation period, focusing on reporting obligations and data collection, without financial payments. The definitive period started in 2026 and introduced financial obligations for authorised CBAM declarants. Importers are required to submit annual declarations, report embedded emissions, ensure third-party verification, and surrender CBAM certificates priced in line with EU ETS allowances. This phase also coincides with the gradual phase-out of EU ETS free allowances, creating a synchronised approach where EU domestic producers face lowering free allowances while importers face increasing CBAM financial adjustment.
The development of a multi-dimensional framework encompassing data quality and compliance could inform the status of and support effective implementation of CBAM (Recommendation 1). Relevant indicators could include the share of importers meeting reporting deadlines, the completeness and accuracy of emissions data, the use of actual values relative to default values, the number of authorised declarants, changes in import patterns and trends in the emissions intensity of covered goods. Building expertise on carbon accounting, trade exposure, compliance risks and sectoral impacts would inform policy discussions and anticipate future changes to the CBAM Regulation that could affect its implementation.
The effective implementation of the CBAM involves several actors (Section 1.4). The European Commission provides the regulatory framework, develops methodologies, manages the CBAM Registry and oversees consistent implementation across EU Member States. National Competent Authorities (NCAs) are responsible for authorising CBAM declarants, monitoring compliance and applying penalties where needed. EU Member States have designated a diverse range of institutions as their NCAs, reflecting differences in national administrative structures (European Commission, 2026[1]). In addition, Customs Authorities support implementation through border controls and data checks. Finally, CBAM declarants – comprising importers and indirect customs representatives – are responsible for collecting emissions data from suppliers, ensuring verification and meeting reporting and CBAM certificate obligations.