Carbon Border Adjustment Mechanism

A carbon border adjustment mechanism (CBAM) makes covered imported goods bear a carbon cost comparable to that faced by similar goods produced domestically. It links the import obligation to the goods' embedded emissions, meaning the greenhouse gases released during their production, rather than simply to their market value. Its purpose is to prevent imports from gaining a price advantage solely because their producers face weaker carbon-pricing requirements.

Domestic carbon-cost benchmark

Equalisation begins with the carbon cost imposed on domestic producers. Under an emissions trading system, producers must obtain allowances for covered emissions, and the allowance price provides a benchmark for pricing emissions embedded in imports.

• The comparison concerns equivalent products and emissions covered by the mechanism, not every environmental cost incurred by producers.
• Where domestic producers receive free allowances, the border adjustment must account for that relief to avoid charging imports more heavily than comparable domestic production.
• Equalisation therefore means comparable effective carbon costs, not identical production costs, environmental regulations or final selling prices.

Calculation of the import obligation

The mechanism translates the imported product's covered emissions into a financial obligation using the relevant domestic carbon price. The European Union's design uses CBAM certificates whose price is linked to its emissions trading system.

• Importers must report the embedded emissions of covered goods, making emissions measurement and verification central to the calculation.
• Before applicable adjustments, the obligation broadly reflects the quantity imported multiplied by emissions per unit and the relevant carbon price.
• A qualifying carbon price paid abroad is credited under the applicable rules, preventing the same emissions from being charged twice.
• A cleaner production process reduces the adjustment by lowering the emissions attributed to each unit of the imported product.

How it addresses carbon leakage

Carbon leakage occurs when production or demand shifts towards locations with weaker carbon constraints instead of global emissions falling. A CBAM counters import substitution directly and reduces incentives to relocate production by narrowing the carbon-cost difference between domestic and foreign goods.

• Applying a comparable carbon cost to imports limits the competitive disadvantage faced by domestic producers subject to carbon pricing.
• Because liability depends on carbon intensity, foreign producers retain an incentive to adopt cleaner production rather than merely shifting output across borders.
• For exporters, carbon intensity becomes an additional determinant of competitiveness alongside price, quality and delivery reliability.
• Exporters may face both the carbon-related charge and compliance costs associated with emissions reporting and verification.
• The trade-policy challenge is to achieve environmental comparability without discriminatory treatment or an adjustment exceeding the effective domestic carbon burden.