Steel processors that source the same precursor materials from multiple installations may need to use a weighted-average embedded-emissions value under the European Union’s Carbon Border Adjustment Mechanism (CBAM). The European Commission has clarified that operators can instead rely on data from a single supplier or a subset of suppliers when they can show that the identified materials entered a specific production process.
Commission clarification on using single-supplier emissions data
The clarification links CBAM treatment to whether material can be traced to the production process in which it was used. Where a manufacturer buys the same CN-coded precursor from both low-emission and high-emission mills, supplier identity alone does not establish eligibility for applying the lower-emission value to particular finished goods.
To separate emissions for CBAM purposes, operators need evidence on which precursor materials were used in the relevant production process. If that information is not demonstrated, the applicable approach remains a weighted average of the precursor received from different installations.
Production records used to connect inputs to output
Evidence that supports separate treatment can come from factory management systems already in place. Examples include purchase orders, coil or heat numbers, warehouse locations, batch records, and enterprise resource planning (ERP) movements.
Additional documentation cited includes material issue slips and production-routing documentation. These records can establish the connection between material from a specific supplier and the production process where it was used.
Maintaining that connection is described as a way to preserve the documented emissions advantage of a lower-carbon supplier rather than diluting it through averaging. The approach depends on whether the operator can demonstrate that separation is possible for the relevant finished goods.
Potential CBAM expansion from 2028 increases compliance focus
The traceability issue could become more significant if the EU adopts an extension of CBAM to additional steel-intensive finished products from 2028. The proposal remains under negotiation and is not yet effective law.
If adopted, additional fabricators would fall within a system where embedded emissions of purchased metal could directly affect their CBAM costs. For companies in Serbia and other Southeast European markets supplying EU-facing customers, this raises expectations around how lower-carbon inputs are handled.
Supplier qualification and financing depend on verified emissions evidence
The clarification also affects supplier qualification practices. Procurement teams may increasingly assess mills not only on price, product grade, and delivery reliability, but also on their ability to provide verified installation-level emissions data and support material segregation within the customer’s production system.
Financing arrangements may also be influenced. For banks providing working capital to manufacturers supplying the EU, traceable inventories of lower-emission precursors may support a more predictable CBAM position than physically equivalent materials without usable verification records.
The commercial significance is described as combining physical material identification with reliable emissions evidence. Under CBAM, chain-of-custody records can become a financial attribute of steel inventory, helping determine whether a documented emissions advantage carries through to downstream production calculations.