Estimate the embedded-carbon surcharge, supplier risk, and alternative-sourcing options for CBAM-scope products

A CBAM readiness review quantifies how the European Union's Carbon Border Adjustment Mechanism will reshape the client's cost base, supplier book, and export competitiveness once the definitive regime enters force. The work identifies the in-scope HS6 lines in the client's portfolio, prices the embedded-emissions surcharge at the border, reads the exposure of current suppliers by origin and emissions intensity, and lays out the alternative-sourcing options with their own risk profiles. It is equally useful to an EU importer preparing its verification and reporting stack, and to a non-EU exporter trying to understand how its shipments will compete after the carbon charge applies.

Problem

CBAM's definitive regime enters force in the first quarter of 2026, ending the transition period during which importers have been required to report embedded emissions without paying the charge. From that point forward, importers of cement, iron and steel, aluminium, fertilisers, hydrogen and electricity into the EU will be required to purchase CBAM certificates corresponding to the embedded emissions of their shipments, priced against the EU Emissions Trading System benchmark and netted of any carbon price already paid in the country of production.

For a client with material exposure, three questions follow. Which HS6 lines in the current import or export book actually fall in scope, once the Annex I product scope is mapped down from the implementing regulation to the customs tariff? What is the likely surcharge on each line under the definitive regime, both for the baseline EU ETS price path and for a higher-price-carbon scenario in which the EU Innovation Fund pressures or geopolitical supply-shocks push the benchmark higher? And which alternative suppliers, of the same HS6 line, sit in origins with lower embedded emissions or higher paid-carbon regimes that net favorably against the CBAM charge?

The review answers these questions with the primary product scope, the best available emissions-intensity data, and the workbench's full BACI-bilateral sourcing map.

Data

Product scope follows the EU CBAM regulation Annex I mapped to HS6. The mapping is not one-to-one: some EU customs codes roll up multiple HS6 lines and some HS6 lines sit only partly in scope depending on the CN8 position, which the review flags explicitly for each line. Bilateral trade flows by HS6 come from CEPII BACI at the usual thousands-USD convention. Critical-minerals and metals trade, where the downstream aluminium and steel exposure reaches back into primary-input sourcing, draws on the workbench's critical-minerals panel backed by USGS Mineral Commodity Summaries and the IEA Critical Minerals database. For rare earths specifically, the workbench maintains a supplier panel at the HS6 and producer-mine level.

Energy use by country is the World Bank World Development Indicators set, which gives the denominator for intensity comparisons. Fertiliser-specific flows use the FAO fertiliser tables alongside HS 31 BACI to reconcile volumetric and value-basis reads. Embedded-emissions estimates are built on the methodology in Simola (2020, Bank of Finland Institute for Emerging Economies), which attributes upstream emissions to final products through an input-output decomposition and is the standard reference used in the CBAM impact-assessment literature. Where primary facility-level emissions data is available (for example from Worldsteel, International Aluminium Institute, or client-supplied verified supplier data), it replaces the Simola defaults for that line.

Method sketch

The review runs in four steps. First, in-scope identification: every HS6 line in the client portfolio is checked against the CBAM Annex I scope, with partial-scope lines flagged for CN8 verification. The output is an in-scope product table with annual trade value and volume by origin over the most recent five years of BACI coverage.

Second, supplier concentration: for each in-scope line, the review computes a Herfindahl-Hirschman index over the origin distribution of the client's imports, plus the top-five supplier share and the geographic split between EU, non-EU-with-carbon-price, and non-EU-without-carbon-price origins. High-HHI lines are the ones where supplier substitution is hardest; low-HHI lines are the ones where the client already has the sourcing flexibility to shift toward lower-embedded-emissions origins if the economics warrant.

Third, embedded-emissions surcharge estimate: for each in-scope line and each major origin, the review attributes embedded emissions using the Simola (2020) attribution plus any available facility-level overrides, then prices the resulting tonnes of CO2-equivalent at the EU ETS benchmark net of any paid carbon price in the origin. The baseline scenario uses the current EU ETS reference price; the high-price-carbon scenario uses a stressed path calibrated to reach the upper bound of the EU Innovation Fund and the 2030 ETS cap trajectory. Both scenarios are reported per shipment, per HS6 line, and as a total annual charge against the current book.

Fourth, alternative-sourcing and stranded-value projections: for each in-scope line, the review identifies the three to five candidate alternative origins with the largest combined score on emissions intensity, paid-carbon credit, distance, and prior trade volume with the client country. Stranded-value projections compute the current-book cost exposure under the two carbon scenarios and the cost exposure under the reoptimized sourcing mix, making the switching-cost calculus explicit.

Deliverable

The standard deliverable is a twenty-page readiness review, a supplier-HS6 risk map, and a scenario table comparing baseline and high-price-carbon scenarios. The written review opens with an executive exposure summary, continues through in-scope identification, supplier-concentration reading, embedded-emissions surcharge under both scenarios, and alternative-sourcing recommendations line by line, and closes with a reporting-and-verification section that maps the client's obligations under the definitive regime against the systems they already have. The supplier-HS6 risk map is a table at the HS6-origin level scoring every supplier on emissions intensity, switching difficulty, and political-risk exposure. The scenario table is a side-by-side comparison of baseline CBAM cost, stressed CBAM cost, reoptimized-sourcing cost, and residual exposure after reoptimization.

Related workbench pages

Each review is backed by live links to the workbench pages that carry the underlying analysis, so the client can verify any exposure number against source and track how the picture evolves as CBAM enters its definitive phase.

• CBAM scope, coverage, and embedded-emissions read
• Stranded-asset exposure under carbon-price paths
• Critical-minerals supplier concentration
• Input-cost decomposition for energy-intensive sectors
• Supply-chain mapping and reshoring scenarios

Timeline

The standard engagement runs three weeks. The first week is scope mapping and supplier-book reconstruction, including any CN8-level disambiguation the product scope requires. The second week is emissions attribution and scenario pricing, with facility-level override reconciliation where the client supplies verified supplier data. The third week is writing, peer review, and final sanity-checking of every number against the primary regulation text and the embedded- emissions source.