EU CBAM · multi-supplier importers
Multiple suppliers, multiple sectors: one CBAM declaration pipeline.
One rejected XML from any supplier delays the entire CBAM declaration set. Carbon Mandate coordinates evidence collection across every installation and validates every file before it reaches your declaration.
Reg (EU) 2023/956 Annex I · IR (EU) 2025/2620 · IR (EU) 2025/2621
Sector exposure: four goods classes
Crude steel, hot-rolled and flat product, alloy and finished steel under Chapters 72 and 73. Typically the highest-volume CBAM-exposed class on a multi-supplier declaration.
Primary and secondary aluminium under Chapter 76. Indirect emissions follow the grid intensity of the smelting country, making origin-grid evidence critical to the declared figure.
Calcined clays, cement clinker, Portland and hydraulic cements under Chapter 25 (2507 · 2523). Clinker is the emission-dominant precursor for the declared figure.
Ammonia, nitric acid, urea and NPK fertilisers under Chapters 28 and 31. Precursor chemistry and N₂O process emissions drive the declared embedded-emissions figure.
Scope per Annex I to Regulation (EU) 2023/956. Each goods line carries its own emissions basis and schema-validation path. One rejected supplier XML in any class delays the complete declaration.
Common questions
Frequently asked.
How many suppliers does a typical CBAM declaration involve?
Most EU importers are not sourcing a single good from a single installation. A typical annual CBAM declaration draws embedded-emissions evidence from several non-EU suppliers at once, commonly in the range of 5 to 20 installations, often spanning more than one sector and origin country. Each one must provide schema-valid data, and every one sits on the critical path of the same declaration. The coordination load scales with the number of suppliers, not with the size of any single shipment.
Why does one missing supplier file hold up the whole declaration?
A CBAM declaration is filed as a single set covering all in-scope goods for the period. Until every relevant installation has supplied embedded-emissions data that validates against the EU CBAM schema, the set is incomplete. One rejected, late or non-conforming XML (anywhere among the suppliers) blocks the declaration just as effectively as twenty would. That is why the work is coordination, not calculation: chasing, checking and reconciling many files to a single schema, on one deadline.
What does it cost when suppliers cannot evidence actual emissions?
For any supplier that cannot evidence actual emissions, the declaration falls back to default values, which carry a markup: +10% in 2026 under the standard schedule of Regulation (EU) 2025/2621, rising to 20% and 30% in later years (fertilisers are the sole reduced exception). The uplift is applied to the declared embedded factor on every tonne where actual data is missing, and is surrendered in CBAM certificates, so the more suppliers that fall back to defaults, the higher the bill. Collecting actual supplier data removes the markup.
Does Carbon Mandate file my CBAM declaration with the EU Registry?
No. Carbon Mandate is a preparer, not a filer. We run the supplier pipeline, check every incoming XML against the EU CBAM schema, and hand your filing team an audit-ready evidence pack. You remain the declarant of record and file with the EU CBAM Registry yourself. We are never the verifier.
Live demonstration
See the XML prepared live - in 20 minutes
No slides. No sales pitch. We open a live CBAM file from your sector, run the same checks we run on every declaration, and show you the XML file we produce.