Industrial exporters supplying both the United Kingdom and the European Union will have to operate under two different carbon-border frameworks from January 2027, when the UK’s Carbon Border Adjustment Mechanism is scheduled to begin. Companies trading in steel, aluminium, cement, fertilisers and hydrogen will face separate pricing methodologies, reporting requirements and documentation obligations across the two markets.
The UK’s mechanism is due to take effect on 1 January 2027, using sector-specific rates linked to the effective carbon costs under the UK Emissions Trading Scheme (UK ETS). The EU’s CBAM has been in its definitive phase since January 2026, with certificate prices derived from EU ETS auctions. Although both systems seek to address carbon costs associated with imported goods, their calculation and payment structures are not interchangeable.
Different approaches to calculating and collecting carbon costs
Under the UK’s published methodology, a quarterly rate will be calculated for each covered sector and adjusted to account for the free allocation received by comparable domestic producers. The UK system is designed as a tax on specified imported goods.
The EU instead requires authorised declarants to purchase and surrender CBAM certificates. Its liability framework is based on embedded emissions, benchmark adjustments and the applicable certificate reference price.
The initial UK CBAM scope does not include electricity. Electricity is, however, covered by the EU mechanism, creating another distinction for businesses supplying both destinations.
These differences mean exporters cannot assume that compliance with one regime will satisfy the other. Even where the manufacturing process and installation emissions remain unchanged, the relevant carbon reference price, free-allocation adjustment, product classification and reporting requirements may vary.
A comparison of the two systems’ prices also requires consideration of their domestic allocation arrangements and the boundaries used to determine taxable emissions. A difference between the resulting rates does not, by itself, establish that one regime provides greater protection than the other.
Separate calculations and contractual price references
Guidance issued by the UK on 16 October 2026 sets out an illustrative methodology. It does not guarantee that future UK rates will match EU CBAM prices. Actual UK rates are to be published quarterly in accordance with the relevant data and legal provisions.
The EU’s certificate pricing schedule also changes over time. For 2026, prices apply by import quarter, while calculation is scheduled to move to a weekly basis from 2027.
Export contracts covering deliveries to both markets will therefore need distinct carbon-price references. They should also specify how price adjustments will be handled after goods have been shipped, rather than relying on a single carbon surcharge for European deliveries.
A destination-specific product matrix can help manufacturers identify the applicable commodity codes, emissions scope, calculation methodology, default-data arrangements and filing deadlines in each market.
Product classification will be particularly important for manufacturers supplying different forms of the same material. Unfinished aluminium and components manufactured from aluminium, for example, may receive different treatment depending on the product and destination.
The UK applies sector-specific border rates adjusted for the UK ETS, while EU liability is calculated through its emissions-based certificate framework. As a result, quotations for the same physical goods may need two separate carbon-cost items, each supported by its own documentation.
Installation data and supply-chain traceability
Although the two regimes require separate compliance calculations, exporters can use common verified emissions information from their production installations as a starting point. A central factory-level monitoring, reporting and verification database, supported by separate calculation modules for each destination, would provide a more adaptable approach than a single spreadsheet designed around one market’s requirements.
This could also benefit trade intermediaries, although they will face additional administrative work when handling goods destined for both jurisdictions. Suppliers able to provide consistent installation-level data in formats accepted by each system may be better positioned to meet customers’ documentation requirements.
Trading houses sourcing products from several manufacturing plants face a more complex traceability task. They will need to connect each consignment to its supplying installation, maintain separate records of carbon prices effectively paid in the country of origin and establish how liabilities are allocated across individual sales contracts.
General claims that a product is low-carbon will not replace the formal emissions reporting and verification requirements under either mechanism. The underlying installation data must be traceable and suitable for the calculation rules applicable to the destination market.
Potential ETS linkage does not remove CBAM obligations
Discussions about a possible link between the EU and UK emissions trading systems could eventually reduce differences between their carbon markets. However, an ETS linkage agreement would not, in itself, exempt companies from either carbon-border mechanism.
Businesses will need to assess their pricing, reporting and data systems against the legislation governing each regime. They will also need to monitor whether future mutual recognition arrangements or closer carbon-price alignment could reduce duplicated work for verifiers and industrial customers.
For exporters, the introduction of the UK mechanism will create a two-market compliance structure. London and Brussels are applying carbon-border measures to maintain domestic decarbonisation incentives, but have selected different regulatory instruments.
Companies seeking to supply both markets will consequently need reliable installation-level emissions data, separate destination-based calculations and carbon pricing arrangements tailored to each jurisdiction.
