CBAM vs EU ETS: The Differences Explained
The EU Emissions Trading System (EU ETS) prices carbon for domestic European manufacturers. The Carbon Border Adjustment Mechanism (CBAM) prices carbon for non-EU manufacturers exporting to Europe. They are mirror policies designed to prevent carbon leakage.
| Dimension | EU ETS | CBAM |
|---|---|---|
| Regulatory home | Directive 2003/87/EC | Regulation (EU) 2023/956 |
| Who pays | EU domestic industrial installations | EU importers of covered goods |
| Sectors / scope | Power, aviation, maritime, heavy industry | Steel, aluminium, cement, fertilisers, hydrogen, electricity |
| Geographic scope | Production within the EU/EEA | Production outside the EU imported into the EU customs territory |
| Reporting frequency | Annual (March 31) | Annual (May 31) from 2027 |
| Penalty regime | €100 per tonne + surrender obligation | €50–€150 per tonne + surrender obligation |
| Effective date | Established 2005 | Definitive phase starts Jan 1, 2026 |
| Documentation required | Verified emissions report (national body) | Verified embedded carbon record (ISO 14065) |
The Mirror Policies of European Decarbonisation
The European Union Emissions Trading System (EU ETS) and the Carbon Border Adjustment Mechanism (CBAM) are two halves of the same regulatory framework. The EU ETS was established in 2005 to price carbon emissions generated by domestic European manufacturers. CBAM was established in 2023 to price the embedded carbon in goods imported from outside the EU.
The fundamental logic linking the two systems is the prevention of "carbon leakage." For nearly two decades, the EU granted free ETS allowances to heavy industries (like steel and cement) to prevent them from relocating to jurisdictions with weaker environmental regulations. As the EU accelerates its transition to net-zero, these free allowances are being phased out. CBAM replaces them by imposing an equivalent carbon price on imports, ensuring a level playing field.
When to use the EU ETS framing
- When analysing the cost structure of domestic European manufacturing facilities.
- When trading carbon allowances on the open market (EUA futures and spot markets).
- When assessing the impact of the free allowance phase-out schedule (2026–2034) on European industrial competitiveness.
- When discussing the cap-and-trade mechanism that guarantees absolute emission reductions across the continent.
When to use the CBAM framing
- When calculating the compliance costs for non-EU manufacturers exporting covered goods to the European market.
- When determining the obligations of EU importers acting as authorised CBAM declarants.
- When negotiating supply contracts between non-EU producers and European buyers, where the embedded carbon intensity directly affects the landed price.
- When evaluating the impact of Article 9 deductions for carbon prices already paid in the country of origin.
Real-world example: The Free Allowance Phase-out
Consider a German steel mill (covered by the EU ETS) and an Indian steel mill (covered by CBAM) both supplying the European market. In 2025, the German mill receives a significant portion of its carbon allowances for free to protect its competitiveness. Consequently, the Indian mill faces no CBAM financial obligation during the transitional phase.
Starting January 1, 2026, the EU ETS free allowances begin to phase out. In 2026, 2.5% of the free allocation is removed. In exact symmetry, the CBAM factor is set to 2.5%. This means the Indian mill's EU buyer must purchase CBAM certificates covering 2.5% of the imported steel's embedded emissions.
By 2030, the free allocation phase-out reaches 48.5%, and the CBAM factor rises to match. By 2034, free allowances reach 0%, and the CBAM factor reaches 100%. At this point, the German mill pays for 100% of its emissions via the EU ETS, and the Indian mill's buyer pays for 100% of the embedded emissions via CBAM certificates. The price of a CBAM certificate is calculated weekly by the European Commission based on the average price of EU ETS allowances auctioned the previous week, ensuring exact price parity.
Common misconceptions
- "CBAM certificates can be traded." False. Unlike EU ETS allowances (EUAs), CBAM certificates are not tradable on open markets. They are purchased directly from national competent authorities and surrendered.
- "Non-EU manufacturers buy CBAM certificates." False. The financial and legal obligation to purchase and surrender CBAM certificates rests entirely with the EU importer (the authorised declarant). The non-EU manufacturer's obligation is solely to provide the verified embedded carbon record.
- "CBAM covers all EU ETS sectors." False. The EU ETS covers aviation, maritime, and all heavy industry. CBAM currently only covers six specific sectors (steel, aluminium, cement, fertilisers, hydrogen, electricity) with high carbon leakage risk.
Regulatory citations
The phase-out of free allocation under the EU ETS is governed by Directive 2003/87/EC as amended by Directive (EU) 2023/959. The corresponding CBAM phase-in schedule is established in Regulation (EU) 2023/956, Article 31.
The pricing mechanism linking CBAM certificates to the EU ETS weekly average auction price is defined in Article 21 of Regulation (EU) 2023/956.
Frequently Asked Questions
What is the difference between CBAM and the EU ETS?
The EU ETS prices carbon for domestic European manufacturers via a cap-and-trade system where companies buy and sell allowances. CBAM prices carbon for non-EU manufacturers exporting to Europe via an import tariff pegged to the weekly average EU ETS auction price. They are mirror policies: the EU ETS prices production inside Europe, CBAM prices production outside Europe that enters the EU market.
How is the CBAM certificate price calculated?
CBAM certificate prices are calculated weekly by the European Commission based on the average price of EU ETS allowances auctioned during the previous week. This ensures non-EU manufacturers face the exact same carbon price as domestic EU producers. The calculation is published by the European Commission and is publicly available.
What happens to CBAM as EU ETS free allowances phase out?
As EU ETS free allowances phase out between 2026 and 2034, the CBAM certificate requirement scales up proportionally. In 2026, the CBAM factor is 2.5% (matching the 2.5% free allocation reduction). By 2034, the CBAM factor reaches 100%, meaning importers must cover all embedded emissions with CBAM certificates.
Are CBAM certificates the same as EU ETS allowances?
No. EU ETS allowances (EUAs) are tradable instruments that can be bought and sold on open carbon markets. CBAM certificates are not tradable. They are purchased directly from national competent authorities at the weekly-calculated price and must be surrendered for the specific embedded emissions declared. Unused CBAM certificates can be repurchased by the national authority.
Which countries are exempt from CBAM?
Countries participating in the EU ETS or with equivalent carbon pricing mechanisms linked to the EU ETS are exempt from CBAM. This currently includes Iceland, Liechtenstein, Norway (as EEA members), and Switzerland (via the linked Swiss ETS). The EU may grant exemptions to additional countries with comparable carbon pricing in the future.