Your Complete Guide to the EU Carbon Border Adjustment Mechanism

Get clear, practical answers on what CBAM means for your business, how the 2026 changes affect costs, and how supplier emissions data drives your exposure. CarbonChain provides the data, workflows and reporting tools to help you comply with confidence.

What is CBAM?

The Carbon Border Adjustment Mechanism is the European Union’s carbon border policy. It ensures that imported goods face a similar carbon price to goods produced inside the EU under the EU Emissions Trading System.

The EU describes CBAM as an environmental policy tool for fair carbon emissions pricing, which aims to prevent carbon leakage, protect the competitiveness of EU industries and encourage adoption of lower carbon production globally.

Who does CBAM apply to?

Importers and Declarants

EU-based buyers importing in-scope goods. Required to collect actual emissions from suppliers, calculate CBAM cost, and report via the CBAM Registry.

Installations and Producers

Non-EU producers supplying in-scope goods to the EU. Required to provide actual emissions data to customers so they can calculate exposure. From 2026 actual values are essential.

Traders and Intermediaries

Entities moving goods into or through the EU who may be responsible for CBAM declarations depending on contract structure and delivery terms or want to understand the associated CBAM cost of a trade.

Other Stakeholders

Consultants, auditors, procurement teams, downstream producers and logistics providers increasingly affected by customer requests for emissions data.

What Changes in 2026?

From 1 January 2026, CBAM entered its definitive period. Importers will begin paying for embedded emissions using CBAM certificates, which marks a fundamental change that will impact both procurement costs and supplier relationships. Here are four key things to bear in mind:

Default values are punitive, actual values will be required

Supplier specific emissions data must be verified by an accredited third party to be used. If a supplier does not undertake - or fails - verification, actual emissions data cannot be used and default data/ benchmarks will apply instead.

New EU benchmark values

The European Commission has introduced commodity-code specific benchmarks that define the emissions thresholds for CBAM when using both actual and default values.

Costs come into effect from 1st January 2026

Any CBAM goods that are customs cleared, and released for free circulation, into the EU from 1st January 2026 are subject to EU CBAM costs.

CBAM Registry updates

The EU CBAM Registry will become the central system for managing emissions reporting and certificate management.

Does CBAM Apply to Your Business?

CBAM coverage depends on your location, the goods you import or export, the CN codes involved and your annual tonnage.

Products currently covered

If a product you import into the EU falls under a covered CN code and has a country of production outside the EU, then you are obligated to report under EU CBAM, with a financial liability starting from January 1, 2026.

Who CBAM affects in practice

CBAM generally impacts two sets of businesses: producers of CBAM goods outside of the EU and importers of CBAM goods into the EU.

• CBAM affects producers, because their EU customers need verified, installation-level emissions data to comply with their reporting obligations and avoid using default values.
• Importers are impacted because they are subject to reporting obligations and CBAM costs associated with their imports from 1 January 2026.

CBAM is expanding beyond today’s scope

The current product list is not the end state. On 17th December 2025, the European Commission stated explicitly that CBAM will expand over time to close carbon-leakage gaps and align more closely with the EU ETS.

How do I Calculate my CBAM Costs?

CBAM becomes a cost regulation on January 1, 2026. Every 0.1 tCO₂e/t difference in emissions intensity changes cost by ~€9/t, directly impacting margins. Importers and traders alike will need to be able to answer critical questions such as:

• What will CBAM cost me next year?​
• How do I quickly compare suppliers?

CBAM Cost Formulas

• Emissions Intensity = the producer's direct embedded emissions intensity of their CBAM goods for aluminium and steel products; both direct and indirect for fertiliser and cement CBAM goods.
• CBAM Benchmark = the benchmark set by either the installation or default value.
• Carbon price paid overseas = the carbon price already paid overseas covering a proportion of the emissions intensity of the CBAM goods.

Why is CBAM Difficult for Most Companies to Manage?

CBAM introduces a level of operational, data, and financial complexity that most producers and importers are not equipped to manage with existing processes. Here are the areas where most companies struggle:

Supplier data collection

CBAM shifts responsibility upstream, requiring importers to collect installation-specific emissions data from global suppliers.

Data quality and consistency

Supplier data often passes through multiple tiers, geographies, and production routes before reaching the importer.

Complex methodologies

CBAM calculations go far beyond simple emissions factors.

Benchmark and price volatility

CBAM cost exposure is directly linked to EU ETS dynamics.

Verification pressure

To use actual emissions data, companies must undergo third-party verification.

How CarbonChain Helps You Manage CBAM

CBAM for Importers (Declarants)

• Actual emissions validation: Replace punitive default values with supplier-specific emissions data.
• Automated supplier outreach: Request, track, and manage CBAM data from dozens or hundreds of suppliers in one place.

How to Comply with CBAM: Importers

1. Confirm whether you import CBAM-covered goods: Assess whether your imports fall within CBAM scope.
2. Apply for authorised CBAM declarant status: Register to become an authorised declarant.
3. Identify suppliers and request actual emissions data: Contact all relevant suppliers and request installation-specific data.
4. Calculate and estimate CBAM cost exposure: Apply CBAM formulas using embedded emissions, benchmarks.
5. Report declarations via the EU CBAM Registry: Submit annual CBAM declarations.
6. Purchase and surrender CBAM certificates: Procure CBAM certificates from 2027.

How to Comply with CBAM: Producers

1. Identify whether your products are exported to the EU: Confirm whether your goods are CBAM goods.
2. Define covered products and production routes: Establish which installations fall within CBAM scope.
3. Develop a CBAM-aligned monitoring methodology: Ensure alignment with EU ETS-grade requirements.
4. Track production and precursor emissions data: Collect activity data and emissions factors.
5. Model future CBAM cost exposure: Assess how your installation-level benchmarks affect costs.
6. Engage customers on cost and data strategy: Share emissions insights with EU customers.

FAQs

Is EU CBAM a tax?
CBAM is not officially a carbon tax but will function similarly.

What sectors are included in EU CBAM?
CBAM covers high-emitting commodities including electricity, cement, aluminium, fertilisers, iron, steel and hydrogen.

What is the difference between EU ETS and CBAM?
CBAM complements the EU ETS by covering goods imported from outside the EU.