CBAM Exposure Methodology Overview

By Ahmed Medhat · Published11 April 2026 · Updated 3 September 2026

CBAM Exposure Methodology Overview

How Your Carbon Data Sets Your Buyer's CBAM Cost

The EU Carbon Border Adjustment Mechanism (CBAM) puts a price on the emissions embedded in the goods you export to the EU.

From January 1, 2026, CBAM transitions into its definitive phase. From then on, your EU buyer surrenders CBAM certificates for the embedded emissions of your goods (Regulation (EU) 2023/956, Article 22).

Your buyer's CBAM cost on your goods is calculated from the embedded emissions declared for them.

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1. Who Pays: Your Buyer, on Your Data

As an exporter, you do not pay the EU for CBAM certificates—your European buyer does, on the embedded emissions declared for your goods.

If your exposure is high, your buyer's costs are high. Two products that look identical on a technical specification sheet carry different CBAM costs when their embedded emissions differ.

The embedded emissions declared for your goods come either from your data or from a default value. You have two options:

• Default Mode: If you cannot provide verified, installation-level data, your buyer uses "default values." Annex IV, point 4.1 of Regulation (EU) 2023/956 sets them at the average emission intensity of the exporting country for that good, increased by a mark-up. Where reliable data for the exporting country is not available, the value falls back to the average of the 10 exporting countries with the highest emission intensities for that good.
• Actual Mode: With verified actual emissions data, your buyer's CBAM bill is calculated on your installation's own emissions, which carry no mark-up.

Default values and the mark-up:

Default values apply where verified actual data is missing. The EU applies a 10% mark-up to default values in 2026 for cement, iron and steel, aluminium and hydrogen, rising to 20% in 2027 and 30% from 2028; fertilisers carry 1% throughout (Implementing Regulation (EU) 2026/1740, Annex I).

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2. Defining Your System Boundaries

An installation is "a stationary technical unit where a production process is carried out" (Regulation (EU) 2023/956, Article 3(30)). Embedded emissions are determined per installation, not per company, country or sector average.

The calculation covers:

• Direct Emissions: All combustion and process reactions occurring directly within your physical boundary.
• Indirect Emissions: For the goods not listed in Annex II — cement, fertilisers and agglomerated iron ore (CN 2601 12 00); Article 7(1) — the emissions from producing the electricity consumed count too.
• Precursor Emissions: If you manufacture complex goods from relevant precursors (such as pig iron or ammonia), their embedded emissions are part of your goods' embedded emissions (Annex IV). Your buyer must declare embedded emissions that include them, and your data is how it does so.

Note: EPDs (Environmental Product Declarations) and LCAs (Life Cycle Assessments) do not equal CBAM compliance. The EU has strict boundary rules that differ from standard LCA reporting.

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3. The 4-Step Exposure Calculation Formula

Whether your buyer uses the DeCarbonPro Calculator or models their risk manually, the CBAM cost on your goods is derived in four steps.

Step 1: Determine Specific Embedded Emissions (SEE)

First, your total emissions intensity (tCO2e per tonne of product) is established. This is your core emissions factor (EF). If you produce complex goods, this involves calculating a weighted average of your precursor emissions combined with your direct installation emissions.

Step 2: Apply the Benchmark (Specific Embedded Free Allocation)

To ensure a level playing field, the EU subtracts a "benchmark" amount of emissions—mirroring the free carbon allowances that a similar operator inside the EU would have received.

• For simple goods (no precursors), the EU provides standard benchmarks.
• For complex goods, the specific embedded free allocation also takes into account the free allocation embedded in each precursor consumed (IR (EU) 2025/2620, Annex, points 3.1 and 3.3).

Step 3: Multiply by the Certificate Price, with the CBAM Factor

What remains after the deduction, and never less than zero, is multiplied by the CBAM certificate price. For 2026 that is the quarterly average of EU ETS auction clearing prices (IR (EU) 2025/2548, Art. 1(1)).

The benchmark is scaled by the cross-sectoral correction factor and by the year's CBAM factor: 97.5% in 2026, 95% in 2027 and 90% in 2028, falling each year after that, with no factor applied from 2034 (Directive 2003/87/EC, Article 10a(1a)). As the factor falls, less of the benchmark is deducted.

Step 4: Deduct Carbon Price Paid Overseas

Where actual emissions are used and a carbon price was effectively paid in your country for them, your buyer can claim a reduction in the number of CBAM certificates to surrender, net of any rebate or other compensation available there (Regulation (EU) 2023/956, Article 9(1)).

The Final Formula:

For your facility's internal modeling, the financial exposure per tonne of your exported material is calculated as:

$\text{CBAM Cost (€/t)} = \max\left(0,\ \text{EF} - \text{Benchmark} \times \text{CBAM Factor} \times \text{CSCF} \right) \times \text{Certificate Price}$

Any Article 9 reduction is converted into a number of certificates under an implementing act still to be adopted (Article 9(5)), so it is not in this formula.

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4. Building a Verification-Ready Methodology

From 2026, actual emissions must be verified by a verifier accredited pursuant to Article 18 (Article 8(1)). Where they are not, your buyer declares default values.

What CBAM-Ready Data Looks Like:

• Production Volumes: Tonnes per goods type and exact CN code for the full annual reporting period.
• Fuel Consumption: Type, quantity, net calorific value, and carbon content per fuel stream.

The Bottom Line for Producers A buyer can declare your installation's actual emissions only once they are verified; otherwise the default value applies.