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Taxation and Customs Union

Carbon Border Adjustment Mechanism


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Climate change is a global problem that needs global solutions. As the EU raises its own climate ambition, and as long as less stringent climate policies prevail in many non-EU countries, there is a risk of so-called ‘carbon leakage'. Carbon leakage occurs when companies based in the EU move carbon-intensive production abroad to countries where less stringent climate policies are in place than in the EU, or when EU products get replaced by more carbon-intensive imports.

The EU’s Carbon Border Adjustment Mechanism (CBAM) is our landmark tool to put a fair price on the carbon emitted during the production of carbon intensive goods that are entering the EU, and to encourage cleaner industrial production in non-EU countries. The gradual introduction of the CBAM is aligned with the phase-out of the allocation of free allowances under the EU Emissions Trading System (ETS) to support the decarbonisation of EU industry. 

By confirming that a price has been paid for the embedded carbon emissions generated in the production of certain goods imported into the EU, the CBAM will ensure the carbon price of imports is equivalent to the carbon price of domestic production, and that the EU's climate objectives are not undermined. The CBAM is designed to be compatible with WTO-rules.

This infographic describes how the CBAM works in practice

Latest developments

The CBAM regulation officially entered into force the day following its publication in the Official Journal of the EU on 16 May 2023. The CBAM itself will enter into application in its transitional phase on 1 October 2023, with the first reporting period for importers ending 31 January 2024.

The reporting obligations and information sought from EU importers of CBAM goods, as well as the provisional methodology for calculating embedded emissions released during the production process of CBAM goods were further specified in an Implementing Regulation adopted by the Commission on 17 August 2023.

Key elements

The CBAM will enter into force in its transitional phase as of 1 October 2023.It will initially apply to imports of certain goods and selected precursors whose production is carbon intensive and at most significant risk of carbon leakage: cement, iron and steel, aluminium, fertilisers, electricity and hydrogen. With this enlarged scope, CBAM will eventually – when fully phased in – capture more than 50% of the emissions in ETS covered sectors.  The objective of this transition period is to serve as a pilot and learning period for all stakeholders (importers, producers and authorities) and to collect useful information on embedded emissions to refine the methodology for the definitive period.

The gradual phasing in of CBAM over time will also allow for a careful, predictable and proportionate transition for EU and non-EU businesses, as well as for public authorities. During this period, importers of goods in the scope of the new rules will only have to report greenhouse gas emissions (GHG) embedded in their imports (direct and indirect emissions), without making any financial payments or adjustments. Indirect emissions will be covered in the scope after the transitional period for some sectors (cement and fertilisers), on the basis of a defined methodology outlined in the Implementing Regulation published on 17 August 2023 and its accompanying guidance.

The Implementing Regulation on reporting requirements and methodology provides for some flexibility when it comes to the values used to calculate embedded emissions on imports during the transitional phase. During the first year of implementation, companies will have the choice of reporting in three ways: (a) full reporting according to the new methodology (EU method); (b) reporting based on equivalent third country national systems; and (c) reporting based on reference values. As of 1 January 2025, only the EU method will be accepted.

The Commission is also developing dedicated IT tools to help importers perform and report these calculations, as well as in-depth guidance, training materials and tutorials to support businesses when the transitional mechanism begins. While importers will be asked to collect fourth quarter data as of 1 October 2023, their first report will only have to be submitted by the end of January 2024.

Once the permanent system enters into force on 1 January 2026, importers will need to declare each year the quantity of goods imported into the EU in the preceding year and their embedded GHG. They will then surrender the corresponding number of CBAM certificates. The price of the certificates will be calculated depending on the weekly average auction price of EU ETS allowances expressed in €/tonne of CO2 emitted. The phasing-out of free allocation under the EU ETS will take place in parallel with the phasing-in of CBAM in the period 2026-2034.

A review of the CBAM's functioning during its transitional phase will be concluded before the entry into force of the definitive system. At the same time, the product scope will be reviewed to assess the feasibility of including other goods produced in sectors covered by the EU ETS in the scope of the CBAM mechanism, such as certain downstream products and those identified as suitable candidates during negotiations. The report will include a timetable setting out their inclusion by 2030.

Sectors concerned by CBAM: cement, iron and steel, aluminium, fertiliser, electricity and hydrogen.

Legislative Documents

17 DE MAYO DE 2023
CBAM regulation in the Official Journal of the EU
(117.57 KB - HTML)
17 DE AGOSTO DE 2023
CBAM Implementing Regulation for the transitional phase
(1.16 MB - HTML)
17 DE AGOSTO DE 2023
Annexes to the CBAM Implementing Regulation for the transitional phase
(1.16 MB - HTML)

Guidance documents

To help stakeholders prepare for the new reporting obligations as from 1 October 2023, the European Commission has prepared written guidance documents, to help navigate the transitional period (1 October 2023 – 31 December 2025):

17 DE AGOSTO DE 2023
Guidance document on CBAM installations for importers of goods into the EU
(1.64 MB - PDF)
17 DE AGOSTO DE 2023
Guidance document on CBAM installations for installation operators outside the EU
(4.22 MB - PDF)
22 DE AGOSTO DE 2023
CBAM communication template for installations – PRELIMINARY 22.8.2023
(1.19 MB - XLSX)


The Commission is organising six online webinars, covering general features of the CBAM as well as the specifics of each sector (iron & steel, aluminium, cement, fertilisers, electricity and hydrogen).

Interested stakeholders are invited to register and participate in the webinars, and will have the possibility to ask questions which will be answered live. All webinars will be recorded and uploaded on the Customs & Tax EU Learning Portal.

TopicDate and registration

The webinar recording is available here.


21 September 2023, 14:00-15:30 (CET time)

Registration for this webinar is now closed.


26 September 2023, 11:30-13:00 (CET time)

Registration for this webinar is now closed.


28 September 2023, 09:30-11:00 (CET time)

Registration for this webinar is now closed.


3 October 2023, 15:30-17:00 (CET time)

Registration for this webinar is now closed.

Iron and steel

5 October 2023, 16:00-17:30 (CET time)

Registration is now open here.

A seventh webinar for National Competent Authorities will also be organised. The date will be communicated at a later stage.

E-learning courses

A first nano-learning module gives a short top level introduction to CBAM for EU importers and customs declarants and third country operators. It presents the purpose and aims of CBAM, and implications for importers and declarants, the main criteria for CBAM pricing, the six sectors targeted by CBAM and the roles and responsibilities within the CBAM administration system, as well as planning priorities including key milestones and explains the calculation methods and reporting requirements.

An e-learning module for the cement sector has also now been made available here.

Further training modules covering sector-specific content will soon become available on the Customs & Tax EU Learning Portal.

Further info

10 DE MAYO DE 2023
CBAM Factsheet
(949.32 KB - PDF)
17 DE JULIO DE 2023
Questions and Answers: Carbon Border Adjustment Mechanism (CBAM)
(269.17 KB - PDF)

Related Links

Press release on the political agreement reached by the co-legislators on the Carbon Border Adjustment Mechanism (December 2022)

Commission proposal for a Carbon Border Adjustment Mechanism (July 2021)

Commission Staff Working Document Impact Assessment accompanying the Proposal for a Carbon Border Adjustment Mechanism (July 2021)