The European Union’s Carbon Border Adjustment Mechanism (CBAM) is set to introduce financial obligations on eligible steel imports from 2026, exposing vehicle manufacturers to carbon-related sourcing costs. The expense may reach carmakers through suppliers and component makers even when they do not import steel themselves.
CBAM exposure can arise before steel reaches a vehicle plant. Imported slabs and flat products may pass through suppliers for rolling, coating, stamping and welding before becoming body panels, chassis parts or subassemblies. The intermediaries handling the material determine where the legal obligation first applies and how costs may be passed on.
The EU imported 60.95 billion euros of steel and iron products under Chapter 72 and Chapter 73 codes in 2025. Hot-rolled and cold-rolled flat steel are especially relevant to vehicle makers, but whether a product is covered depends on its exact eight-digit code; some automotive parts remain outside current Annex I coverage.
The European Commission’s December 2025 downstream proposal would extend CBAM to additional goods from 2028 if agreed. Such an extension could redraw the boundary between basic metal products and manufactured components, affecting which items in automotive supply chains fall within the mechanism.
Automotive purchasers need to identify the installation that produced relevant steel feedstock, which processing steps are included in emissions calculations, and whether the importer has verified actual emissions or will use default values. A generic low-carbon certificate from an immediate parts supplier does not establish those details. Emissions can also differ between mills using blast furnaces, electric arc furnaces and scrap, even when their steel meets the same technical specification.
The cost reaching a vehicle maker will depend on contractual arrangements. Suppliers may add metal surcharges, revise long-term price formulas, hold prices fixed until the next model-year negotiation or absorb increases to protect sales volume. An importer paying CBAM certificate costs may pass them to a service centre, which may or may not pass them on to a stamping company; carmakers buying finished parts from EU suppliers can therefore still have indirect exposure.
Further market analysis would need to examine product-level imports, metal service centres and documented supplier relationships in Germany, Italy, France, Spain, Poland and central Europe. It should establish where prices are indexed to steel costs and where carbon charges are separate contractual items. Supply chains combining reliable quality, transparent emissions evidence and manageable cost-adjustment clauses are likely to have an advantage over those offering only the lowest headline steel price.
