The United Kingdom has published the technical and compliance framework for its Carbon Border Adjustment Mechanism (CBAM), setting out requirements for importers and overseas producers ahead of the system’s start on 1 January 2027. HM Revenue & Customs (HMRC) released the package on 16 October 2026, covering emissions calculations, default values, independent verification, record-keeping and the methodology used to determine CBAM rates.
With less than three months remaining before implementation, the guidance specifies operational requirements for trade in five covered sectors: iron and steel, aluminium, cement, fertilisers and hydrogen. Electricity is excluded from the UK mechanism, creating a different sectoral scope compared with the European Union’s CBAM.
Sector coverage and differences with EU CBAM
The exclusion of electricity is described as a structural difference between the UK and EU carbon-border regimes. The EU mechanism includes electricity as a dedicated sector, with provisions addressing actual emissions and cross-border contractual arrangements.
Companies exporting to both markets are therefore required to carry out separate assessments of product coverage and compliance obligations. While both systems address carbon content in imported goods, their scope, pricing arrangements and reporting procedures are not aligned.
The UK guidance also sets out how importers and foreign producers can determine which emissions data may be used for customs-related CBAM reporting. It further defines when actual installation-level emissions can replace HMRC’s prescribed default values.
Emissions data, verification and use of default values
Overseas installations seeking to provide actual emissions figures for UK CBAM reporting must monitor emissions over a full calendar year. The resulting data must be verified by an eligible independent verifier before importers can use the actual values under the framework.
If monitoring records or verification are not available, importers must apply the relevant HMRC default values. The guidance links the availability of verified emissions information to commercial considerations between overseas producers and UK customers.
Producers are expected to determine before the mechanism begins whether they can support a verified actual-emissions reporting route or whether UK customers will need to rely on default figures. The choice is stated to affect commercial pricing, contractual provisions, customer selection and working-capital requirements.
The requirements also place emphasis on access to qualified independent verifiers and on maintaining emissions records that meet applicable reporting conditions. For exporters, emissions monitoring and verification are positioned as part of routine trade operations rather than activities addressed only after entry into force.
Quarterly pricing under UK ETS and EU certificate pricing
The UK CBAM is set to apply a quarterly pricing structure, with rates adjusted to reflect the effective carbon price under the UK Emissions Trading Scheme (UK ETS). Separate rates apply across each covered sector, with first live rates scheduled for the beginning of 2027.
The UK approach is contrasted with the EU’s certificate-pricing arrangements. Under the EU system, certificate prices are derived from EU ETS auction prices, with quarterly certificate pricing applying in 2026 and a transition to weekly pricing from 2027.
Exporters supplying both markets are expected to account for separate carbon-pricing methodologies and compliance processes. Although both mechanisms target emissions associated with imported goods, their pricing schedules and administrative requirements remain distinct.
Compliance implications for steel and aluminium exports
For steel and aluminium producers in Southeast Europe, the UK guidance highlights aligning plant-level emissions monitoring with destination-market requirements. It notes that a single installation-level emissions file may not be sufficient to meet both UK and EU reporting requirements without additional processing.
Producers may need to map emissions data into different product groupings, verification standards and importer reporting structures. A common monitoring, reporting and verification (MRV) system at plant level can support data collection across export markets but does not remove the need for market-specific compliance procedures.
The ability to provide verified actual-emissions data may also affect supplier selection and contract negotiations. Where verification is unavailable and default values must be applied, carbon-related liability for importing customers may be higher or less predictable.
Trade finance considerations for carbon-adjusted costs
The new requirements also have implications for banks and trade-finance providers handling transactions in covered commodities. Lenders and financing counterparties are expected to distinguish between the headline commodity price and the carbon-adjusted landed cost of imported goods.
A supplier that cannot provide verified emissions data may expose customers to a default-based CBAM liability that is higher or less predictable than liability based on verified actual values. This can influence credit limits, procurement terms and financial conditions attached to cross-border transactions.
For exporters, commercial consequences extend beyond emissions reporting itself. Access to verification, reliability of installation-level records and allocation of carbon-border costs in contracts can affect terms offered to UK buyers.
HMRC’s publication dated 16 October 2026 provides an operational framework ahead of the mechanism’s scheduled launch on 1 January 2027. It establishes requirements covering emissions data, independent verification, default values, record retention and sector-specific carbon pricing under the UK CBAM.