CBAM definitive period: what actually changes for a non-EU exporter
The transitional reporting phase ended. From 2026 the certificate purchase obligation is live, and the practical burden lands on your embedded-emissions data long before it lands on your invoice.
The short version
The EU Carbon Border Adjustment Mechanism has moved from reporting-only into the definitive period. If you export cement, iron and steel, aluminium, fertilisers, electricity or hydrogen into the EU, your importer now buys certificates against the embedded emissions of your goods.
The obligation is legally the importers. The data obligation is effectively yours, because they cannot file without it.
What an exporter actually has to produce
- Installation-level emissions data for the production route used, not a sector average
- Direct and, for the relevant goods, indirect embedded emissions per tonne
- Any carbon price already paid in the country of origin, which is deductible
- Verification by an accredited verifier
The default values published by the Commission are deliberately conservative. Using them is allowed and expensive. Most exporters who measure properly land meaningfully below default, and that gap is the whole commercial case for doing the work.
Where exporters are getting caught
The failure mode is not the calculation. It is that the emissions data lives with the plant, the customs filing lives with the importer, and nobody owns the handoff. Filings slip, defaults get applied, and the cost surfaces as a price renegotiation two quarters later.
Practical sequence
- Map which of your HS codes are in scope. The list is narrower than most exporters assume and wider than their sales team assumes.
- Get installation-level data for those production routes.
- Establish the carbon price paid at origin, if any, and document it.
- Agree with your EU importer, in writing, who files what and by when.
- Re-price. If you are absorbing the certificate cost silently you are giving away margin.
Scope expansion to downstream goods is the live question for 2027. Exporters outside the current six categories should not assume they are permanently outside.