CBAM Third-Party Verification: What It Is, Who Does It, and Why It Is Required

Is Third-Party Verification Mandatory Under CBAM?

Third-party verification is mandatory for actual emission values. If a non-EU manufacturer wants to use their actual embedded carbon figure — rather than the EU default — that figure must be validated by an ISO 14065 accredited verifier. Self-declaration, internal audits, and unaccredited consultants do not satisfy this requirement.

For default emission values, verification is not required — the EU Commission publishes the default values in Annex III of Implementing Regulation 2023/1570 and any manufacturer can use them without verification. However, default values are set at the 90th percentile of EU production emissions and are typically 2–5 times higher than actual values for modern non-EU facilities. The cost of not verifying is almost always higher than the cost of verification.

What Accreditation Do Verifiers Need?

CBAM verifiers must hold ISO 14065 accreditation — the international standard for bodies that validate and verify greenhouse gas assertions. ISO 14065 accreditation is granted by national accreditation bodies, which are themselves members of the International Accreditation Forum (IAF). The accreditation confirms that the verifier has the technical competence, independence, and quality management systems required to conduct GHG verification.

Accreditation Bodies by Country

What Does the Verification Process Involve?

A CBAM verification engagement typically follows four stages:

1. Scoping and data request: The verifier reviews the facility's production processes, identifies the CBAM-covered goods, and requests the data required for the calculation — fuel consumption records, electricity bills, production volumes, and any existing GHG monitoring systems.
2. Desktop review: The verifier reviews the submitted data, checks the calculation methodology against Implementing Regulation 2023/1570 requirements, and identifies any gaps or inconsistencies.
3. Site visit: The verifier conducts an on-site inspection to verify that the data collection systems are functioning correctly, that the production processes match the calculation assumptions, and that there are no material errors in the data.
4. Verification statement: The verifier issues a verification statement confirming the embedded carbon calculation methodology, data sources, monitoring period, and resulting tCO2e per tonne figure. This is the document you upload to embeddedcarbonrecord.com.

How Long Does Verification Take?

A typical CBAM verification engagement takes 4 to 12 weeks from initial engagement to verification statement issuance. The timeline depends on the complexity of the facility, the quality of existing data collection systems, and the verifier's current workload. Facilities with existing ISO 14001 environmental management systems or EU ETS monitoring plans typically move faster because the data infrastructure is already in place.

Given that EU importers need verified embedded carbon data before they can file their CBAM declaration, manufacturers should allow at least 3 months before their EU buyer's first CBAM reporting deadline. The first CBAM certificates must be surrendered by 30 September 2027 for 2026 imports — meaning verification should be complete by mid-2027 at the latest for 2026 data.

How Much Does CBAM Verification Cost?

Verification cost is a one-off annual expense. The CBAM saving it unlocks recurs every year, compounding as the EU ETS price rises. For any facility exporting more than 1,000 tonnes of CBAM-covered goods per year, the ROI on verification is positive in Year 1 and grows every subsequent year.