CBAM 2026: Which emissions data Chinese suppliers must provide

On 14 August 2026, the European Commission published ten guidance documents for the definitive CBAM phase. For China imports, a customs code alone is not enough. Procurement and the supplier need to describe the production route, relevant processes and embedded emissions in a defensible way.

From code to production route

Start with the exact CBAM goods code and manufacturing plant. Two products that look identical may have different emissions data when melting, semi-finished inputs or processing differ.

Prefer primary data to averages

Request actual plant and production data where the supplier can measure it. If only default values or estimates are possible, keep that assumption visible and schedule a replacement.

Version the evidence

Store the supplier declaration, calculation method, energy source, period and contact with the purchase order and import entry. An edited spreadsheet with no version trail is difficult to defend.

Practical checklist

1. Link the CBAM code, plant, production route and supplier number in one master-data record.
2. Align the data fields to the Commission guidance and flag missing items as open actions.
3. Use a site visit or video interview to plausibility-check process steps and measurement points.
4. Before each import, check for changes to plant, recipe, energy source or calculation method.

<!-- Longform expansion: research review 2026-09 -->

Decision frame for your import

The ten Commission guides published on 14 August 2026 turn CBAM into a structured procurement task. The key is not only the goods code, but the link between plant, production route, reporting period, energy use and calculation method. Treat a supplier declaration as a versioned data record rather than a one-off PDF.

Data and document pack per item

For each plant and product request the CBAM code, production route, quantity basis, direct and relevant indirect emissions, energy sources, system boundaries, measurement method and reporting period. Add production orders, meter or fuel data, input quantities and a responsible contact. Label actual values, default values and estimates visibly.

• Reconcile the classification with the technical description and supplier invoice.
• Check plant, line and route against the certificate and factory address.
• Store calculation version, unit and period in every record.
• If primary data are missing, document a deadline and interim value instead of hiding the gap.

A verification workflow from supplier to import

1. First establish in procurement whether the goods and import are in CBAM scope.
2. Send the Commission schema to the Chinese supplier and mark mandatory fields.
3. Use a video or on-site interview to plausibility-check process steps, energy sources and measurement points.
4. Before customs filing, reconcile data, quantity and origin with the forwarder.
5. Reapprove the record after any formula, plant or energy change.

A worked decision example

Two plants quote the same steel item. Plant A provides a traceable route and meter data; Plant B offers only a low flat value. Although its unit price is slightly higher, Plant A is more predictable because its emissions record can be checked and verified later. The decision is based on total effort and risk, not EXW price alone.

Common failure modes and countermeasures

• Presenting an average as primary data — label the source and status of every value.
• Recording only the trading company — require plant and route references.
• Accepting a spreadsheet with no unit or period — make both mandatory.
• Requesting data only after shipment — include CBAM fields in supplier approval.

Message to send to the Chinese supplier

Send a clear, row-by-row data request:

For each item, please provide plant, process route, CBAM code, production period and quantity basis. Please separate direct and relevant indirect emissions and identify the measurement, calculation or default-value source. Please notify us before the next shipment of any change to plant, energy source, formulation or calculation method.

Release criteria for the file

A release is defensible only when four questions can be answered from the same record: What exactly was checked? Which SKU, batch, route or period does the statement cover? Which primary source or supplier document supports it? Who assessed the deviation and when is it reviewed again? Put those answers in the inspection report instead of marking a line only “passed”. Link the file to the order, sample and receipt. If evidence is missing, give the line an “open” status with an owner and due date. This keeps later corrections traceable and lets procurement distinguish evidence from assumptions.

Follow-up and recheck

Approval is not the end of the check. Set a trigger for the next review: a new batch, material or process change, an authority notice, a price or lead-time deviation, or the scheduled review date. A short monthly reconciliation of orders, supplier data and received goods catches drift earlier than an annual catch-up. When a deviation appears, hold the affected batch, obtain a written supplier response and reopen approval only after a documented corrective record.

<!-- Release template: research review 2026-09 -->

Internal release template

A check mark saying “reviewed” is not enough for this topic. In one short line, state that reconcile the classification with the technical description and supplier invoice.. Add the exact scope (SKU, batch, plant, shipment or period), the primary source and document version. The second line records the open assumption or deviation, its owner and due date. The third line records the release decision and which shipment or version remains on hold. Another colleague should be able to reproduce the decision without searching an entire email thread.

Conclusion

CBAM data quality starts in procurement, not at the customs broker. A versioned supplier form reduces questions and exposes cost risk early.

Frequently asked questions

Does every supplier need its own emissions calculation?

You need defensible data for the covered goods. Whether primary, verified or transitional values are used depends on the CBAM rules and available evidence.

Can the customs broker estimate missing data?

A broker can support the filing, but responsibility for accurate import and emissions data remains with your supply chain.

Are default values always forbidden?

Not every supply chain can provide primary data immediately. The value used, its source and the reason for using it must be traceable.

What is the customs agent’s role?

An agent can transfer and file data. Your import file still needs to secure the accuracy of plant, quantity and emissions information.

Sources

• Europäische Kommission: CBAM-Leitfäden