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 from 1 January 2027. The package was released by HM Revenue & Customs (HMRC) on 16 October 2026. It covers emissions calculations, default values, independent verification, record-keeping and the methodology used to determine CBAM rates.
With less than three months remaining before the start date, the guidance defines operational requirements for trade in five covered sectors. These are iron and steel, aluminium, cement, fertilisers and hydrogen. Electricity is excluded from the UK mechanism, which differentiates its sectoral scope from the European Union’s CBAM.
Sector coverage and differences with the EU CBAM
The exclusion of electricity creates a structural difference between the UK and EU carbon-border regimes. The EU mechanism includes electricity as a dedicated sector and contains provisions addressing actual emissions and cross-border contractual arrangements. As a result, companies exporting to both markets face separate assessments of product coverage and compliance obligations.
Although both systems address carbon content in imported goods, their scope, pricing arrangements and reporting procedures do not match. The UK guidance also provides a framework for determining which emissions data can be used for customs-related CBAM reporting. It sets out conditions under which actual installation-level emissions may replace HMRC’s prescribed default values.
Using verified emissions data versus HMRC default values
Overseas installations seeking to provide actual emissions figures for UK CBAM reporting must monitor emissions across 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, the importer applies the relevant HMRC default values.
This approach makes access to verified emissions information a factor in commercial relationships between overseas producers and UK customers. Producers are required to determine before the mechanism begins whether they can support a verified actual-emissions route or whether UK customers will rely on default figures. The choice can affect commercial pricing, contractual provisions, customer selection and working-capital requirements.
The requirements also increase reliance on access to qualified independent verifiers and on maintaining emissions records that meet applicable reporting conditions. For exporters, emissions monitoring and verification need to be integrated into routine trade operations rather than addressed only after the mechanism enters into force.
Quarterly pricing linked to the UK ETS
The UK CBAM will 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 to each covered sector, and the first live rates are scheduled to take effect at the beginning of 2027. This timetable establishes how pricing will operate once the system starts.
The UK approach differs from EU certificate-pricing arrangements. Under the EU CBAM, certificate prices are derived from EU ETS auction prices. Quarterly certificate pricing applies in 2026, followed by a transition to weekly pricing from 2027.
Exporters supplying both markets therefore need to account for different carbon-pricing methodologies and compliance processes. While both mechanisms target emissions associated with imported goods, their pricing schedules and administrative requirements remain distinct.
Implications for steel and aluminium exporters in Southeast Europe
The UK guidance highlights that steel and aluminium producers in Southeast Europe need to align plant-level emissions monitoring with requirements tied to destination markets. A single installation-level emissions file may not meet both UK and EU reporting requirements without additional processing. Producers may need to map emissions data to 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. However, it does not remove the need for market-specific compliance procedures. Companies serving both jurisdictions still need to account for differences in how products are treated and how emissions information is reported.
The availability of verified actual-emissions data may also influence supplier selection and contract negotiations. Where verification is unavailable and default values must be used, carbon-related liability for importing customers may be higher or less predictable compared with scenarios based on verified actual values.
Effects on trade finance, procurement and contracting
The new requirements 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 involving covered goods. 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 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.