UK CBAM and EU CBAM now run as two independent carbon border regimes with no mutual recognition between them, and exporters selling into both markets face separate carbon cost obligations on every qualifying shipment. As of January 1, 2026, the EU's definitive phase under Regulation (EU) 2023/956 is in force. The UK CBAM launches on January 1, 2027, under HM Treasury's tax-based design. For producers in Turkey, Morocco, India, and other high-exposure countries, this creates a compounding liability that no deduction mechanism currently addresses. This article examines who is exposed to double payment, how costs stack across both regimes, and what options exist to manage the overlap.
Caption: A Turkish steel producer shipping to both Germany and the UK now faces two separate carbon border adjustment obligations with no mechanism to offset one against the other.
Is the UK CBAM Double-Payment Risk Real?
Yes, the double-payment risk is real, and it is structural: no mutual recognition exists between the EU and UK CBAM regimes, no deduction mechanism links the two systems, and exporters who sell identical goods into both markets carry two separate carbon border obligations on separate shipments.
The EU carbon border adjustment mechanism operates through a certificate system priced against EU ETS auction prices, currently approximately €70 per tonne of CO2e (late March 2026 market data). The UK CBAM operates as a direct tax to HMRC, priced against the UK ETS carbon price. The two prices fluctuate independently. The two administrative systems are entirely separate. Neither regime contains a provision recognizing the other as a qualifying carbon price for the purpose of deduction.
Under EU CBAM, Article 9 of Regulation (EU) 2023/956 allows authorized declarants to reduce their certificate obligation when the exporter has paid a carbon price in their country of origin. The question for UK exporters is whether a UK ETS cost or a UK CBAM charge qualifies as such a carbon price. As of April 2026, no Commission implementing regulation has confirmed UK ETS recognition under Article 9. The UK ETS is not linked to the EU ETS. For goods originating in the UK and imported into the EU, the Article 9 deduction is uncertain at best and, in the absence of a bilateral recognition agreement, effectively unavailable.
The EU carbon border adjustment mechanism is designed around the EU ETS framework and grants deductions only for carbon prices paid in the country of production, under schemes recognized by the Commission. The UK ETS remains a separate, unlinked trading system.
Who Faces the Highest UK CBAM and EU CBAM Overlap Exposure?
Three categories of exporters carry the most concentrated double-payment risk under the UK CBAM and EU CBAM overlap.
Exporters selling to both markets simultaneously face the most direct exposure. A Turkish blast furnace steel producer that ships 10,000 tonnes to Germany and 5,000 tonnes to the UK in 2027 incurs EU CBAM on the German shipment and UK CBAM on the UK shipment as two entirely separate obligations. No netting is possible. The embedded emissions of the steel are calculated under two different methodologies, priced against two different carbon price benchmarks, and reported to two different administrative authorities.
Producers in high-volume bilateral trade corridors between countries that export to both the EU and UK face compounding risk in four specific country-sector combinations, listed below.
The four highest-risk exporter profiles for UK-EU CBAM double payment are listed below:
- Turkey: steel (blast furnace) and cement exports to Germany, France, the Netherlands, and the UK
- Morocco: cement exports to Spain and France, and growing steel exports to UK construction supply chains
- India: steel products routed through both markets, particularly structural steel for infrastructure projects
- Ukraine: steel and pig iron exports to EU member states and the UK under separate trade arrangements
UK-based manufacturers using imported CBAM inputs face a different but related problem. A UK steel fabricator who imports Turkish steel billets faces UK CBAM on those billets from January 1, 2027. If the fabricator then re-exports finished steel products to the EU, EU CBAM applies at the EU border. The carbon costs embedded in the input material have now been priced twice: once under UK CBAM on import to the UK, and once under EU CBAM on export to the EU.
How Do EU CBAM and UK CBAM Costs Stack? A Worked Example
The table below shows the combined carbon border cost for a Turkish blast furnace steel producer shipping 1,000 tonnes to Germany and 1,000 tonnes to the UK in calendar year 2027.
| Obligation | Regime | Emission Factor | Carbon Price | Gross Cost |
|---|---|---|---|---|
| Germany shipment (1,000 t BF-BOF steel) | EU CBAM | ~2.0 tCO2/t | ~€70/tCO2 | ~€140,000 |
| UK shipment (1,000 t BF-BOF steel) | UK CBAM | ~2.0 tCO2/t | ~£55/tCO2 (est.) | ~£110,000 |
| Article 9 deduction (EU CBAM) | EU CBAM | Applied only if Turkey ETS qualifies | Uncertain | Likely €0 |
| UK ETS recognition (EU CBAM) | EU CBAM | N/A — UK ETS not linked | N/A | N/A |
| Combined net exposure | Both | 4,000 tCO2e total | Two separate prices | ~€140,000 + ~£110,000 |
Note: EU ETS price ~€70/tCO2 as of late March 2026; UK ETS price is illustrative. Both fluctuate. Net EU CBAM cost in 2026 includes a 2.5% CBAM factor adjustment due to remaining free allocation; this rises annually through 2034.
The 2026 net EU CBAM cost for this producer is substantially reduced by the free allocation adjustment. Under the SEFA methodology in IR (EU) 2025/2620, the gross €140,000 is multiplied by the 2.5% CBAM factor, yielding an approximate net EU CBAM liability of €3,500 for the German shipment in 2026. This figure rises sharply: the CBAM factor reaches 48.5% in 2030, meaning gross EU CBAM costs are effectively in full force by that year. The UK CBAM does not use an equivalent phase-in mechanism of this kind, so UK-side costs apply more immediately at full rate from launch.
What does not change regardless of the CBAM factor is the absence of any offset between the two systems. The €3,500 paid in EU CBAM certificates in 2026 does not reduce the UK CBAM charge. The UK CBAM charge paid to HMRC does not reduce the EU certificate surrender obligation. They operate independently, in full.
Why No Deduction Exists Between UK CBAM and EU CBAM
The absence of mutual recognition between the UK CBAM and EU CBAM regimes is a structural consequence of how both systems were designed, not an oversight.
The EU CBAM deduction mechanism under Article 9 of Regulation (EU) 2023/956 applies only to carbon prices paid "in the country of origin of the goods." For goods originating in Turkey, that means a Turkish carbon pricing scheme. For goods originating in the UK, a UK carbon pricing scheme could theoretically qualify. The UK operates the UK ETS, which is a qualifying-type scheme in principle. However, the Commission must formally recognize a third-country carbon pricing system before importers can use it for Article 9 deduction, and the Commission has issued no such recognition for the UK ETS as of April 2026.
The UK CBAM has no equivalent deduction mechanism for EU carbon costs at all. It does not contain any provision reducing UK CBAM liability when the exporter has already paid EU CBAM on other shipments. The two systems look in entirely different directions: EU CBAM looks at the carbon price paid in the exporter's home country; UK CBAM looks at the carbon content of the imported good priced against the UK ETS.
For more on the structural differences between the two systems, the UK CBAM guide covers the design choices, sector coverage, and administrative requirements of the UK regime in full.
What Can Exporters Do About the Double-Payment Problem?
Exporters facing UK CBAM and EU CBAM double payment exposure have four practical options, none of which eliminates the overlap entirely.
The practical options available to exporters are described below:
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Decarbonize production. Reducing the embedded emissions of the exported good reduces the carbon border cost under both regimes simultaneously. A Turkish steel producer switching from blast furnace to electric arc route (EAF) with low-emission electricity reduces the emission factor from ~2.0 tCO2/t to ~0.5 tCO2/t, cutting the combined carbon border cost by approximately 75%.
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Segment market supply chains. Producing goods specifically for the UK market and separately for the EU market allows the producer to optimize the production route and emissions profile for each market's pricing methodology. This is operationally complex but can reduce total exposure when the two carbon pricing systems have significantly different price levels.
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Monitor UK ETS recognition progress. If the UK ETS is formally recognized by the European Commission under Article 9, UK exporters would be able to reduce their EU CBAM certificate obligation by the amount of UK ETS cost embedded in their production. This would not eliminate double payment but would reduce the EU side of the overlap. Monitoring DG TAXUD announcements on third-country carbon price recognition is essential for any exporter in this position.
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Engage with HMRC and competent authority early. Both the UK CBAM registration process and the EU authorized declarant application require substantial lead time. Exporters shipping to both markets need compliance frameworks in place for both systems before the respective deadlines. For EU CBAM, the authorized declarant authorization application deadline was March 31, 2026. For UK CBAM, registration requirements are governed by HMRC ahead of the January 1, 2027 launch.
Caption: UK CBAM and EU CBAM obligations stack independently with no offset mechanism between the two regimes.
How Does the UK CBAM and EU CBAM Overlap Affect Specific Sectors?
Steel: The Highest Double-Payment Exposure Sector
Steel carries the highest combined UK CBAM and EU CBAM double-payment risk of the six sectors covered by the EU scheme, for three reasons. First, blast furnace steel has an emission factor of approximately 2.0 tCO2 per tonne, generating large absolute carbon costs at both the EU and UK carbon price levels. Second, Turkey is the largest non-EU steel exporter to both the EU and the UK by volume, and Turkey has no domestic carbon pricing scheme that currently qualifies for Article 9 deduction. Third, the UK construction and infrastructure sector is a major buyer of Turkish structural steel, placing Turkish producers squarely in the overlap zone.
The UK CBAM vs EU CBAM comparison article provides a full breakdown of sector-by-sector differences between the two regimes, including where the UK scheme diverges from the EU model on sector coverage and calculation methodology.
Cement: Morocco's Acute Exposure
Morocco exports approximately 3 million tonnes of cement and clinker annually to Spain and France, making it the EU's largest non-European cement supplier. Morocco is also a growing supplier to UK construction projects. Under EU CBAM, Moroccan cement carries an embedded emission factor of approximately 0.83 tCO2 per tonne of Portland cement. With no domestic carbon pricing scheme recognized under Article 9, Moroccan producers receive no deduction on the EU side. UK CBAM adds a second carbon border charge on UK-bound shipments. The combination is particularly acute for Moroccan producers operating at thin margins in competitive cement markets.
Is the UK CBAM a Tax or a Certificate System?
The UK CBAM operates as a direct tax charged to importers by HMRC, calculated on the carbon content of imported goods and priced against the UK ETS carbon price. This design differs fundamentally from the EU's certificate-based approach, where importers purchase and surrender CBAM certificates through the CBAM Registry. The tax-versus-certificate distinction matters for the double-payment question because it means there is no certificate system to offset against, no registry to cross-reference, and no structural mechanism for the two systems to recognize each other's obligations even if the political will existed to create one.
Does Paying EU CBAM Reduce UK CBAM Liability?
No. Paying EU CBAM certificates does not reduce UK CBAM liability. The two obligations are calculated independently on separate shipments entering separate customs territories. An exporter pays EU CBAM on goods entering the EU and UK CBAM on goods entering the UK. Neither payment has any legal effect on the other.
Will UK ETS Recognition Under Article 9 Ever Happen?
The possibility exists but requires a formal Commission decision recognizing the UK ETS as a qualifying carbon pricing scheme under Article 9 of Regulation (EU) 2023/956. No such decision has been issued as of April 2026. A post-Brexit trade and carbon cooperation framework between the UK and EU would be the most direct route to such recognition, but no formal negotiations on carbon policy linkage are underway as of this date. The CBAM compliance for importers section of this site tracks regulatory developments affecting the Article 9 deduction, including any third-country recognition announcements.
Which Countries Face the Worst UK-EU CBAM Double Exposure?
Turkey faces the worst combined UK CBAM and EU CBAM double exposure among all third countries, for two reasons. Turkey is the largest exporter of steel and cement to the EU by volume among non-EEA countries, and the UK is Turkey's second-largest steel export destination. Turkey's absence from any recognized domestic carbon pricing scheme means no Article 9 deduction applies on the EU side and no equivalent relief applies on the UK side. Morocco ranks second in overall exposure, concentrated in cement. India ranks third, with growing steel exposure to both the EU and UK markets.
What Is the Role of CBAM Certificates in Managing UK-EU Overlap?
CBAM certificates under the EU regime must be purchased, held, and surrendered by authorized declarants according to specific rules: at least 50% of cumulative embedded emissions must be held at each quarter end, with full surrender by September 30 annually. No certificate system exists under the UK regime. Managing both obligations requires separate compliance tracks: EU certificate purchasing from February 1, 2027 onward through the CBAM Registry, and UK tax reporting to HMRC under the UK CBAM's separate administrative framework.
Does the Annual CBAM Declaration Cover Both Regimes?
No. The CBAM declaration under EU CBAM covers only goods imported into the EU customs territory. It is submitted to the competent authority of the member state of establishment by September 30 each year, covering the prior calendar year. A separate reporting obligation exists under UK CBAM for goods imported into the UK. Both declarations require embedded emissions data, but the calculation methodologies differ between the two regimes, meaning a single verified emissions report may not satisfy both systems without adaptation.