This Practice Note covers the requirements of Regulation (EU) 2023/956 of 10 May 2023 establishing the EU carbon border adjustment mechanism (the EU CBAM Regulation). The EU CBAM establishes equivalent rules to those imposed by the EU emissions trading system (ETS) for goods with high embedded greenhouse gas emissions being imported into the EU. This Practice Note covers the scope of the EU CBAM, the transition period reporting requirements, and the obligations to submit CBAM declarations and surrender CBAM certificates as applicable from 2026 onwards. It also provides practical guidance on the calculation of embedded emissions, the administration of the CBAM via registries, and the consequences of non-compliance. This Practice Note also covers proposals for reform of the EU CBAM pursuant to the omnibus simplification package, as published in February 2025.