Reasonable assurance: the Commission sets the bar for CBAM verifiers

On 24 August the EuropeanCommission published guidance for CBAM verifiers and the national accreditationbodies that oversee them. It is technical material, but it answers a questionthis site has been tracking all year: what will verification actually demandwhen emissions reports start standing behind certificate surrenders?

The standard is reasonable assurance

The guidance confirms that CBAMverification must deliver a reasonable level of assurance, the same demandingstandard used in the EU ETS, rather than the lighter limited assurance familiarfrom much sustainability reporting. Verifiers must reach high confidence thatan emissions report is free from material misstatement, applying professionalscepticism and demonstrating independence from the operator whose data theycheck.

Materiality gets a number:deviations of 5 per cent in specific embedded emissions or specific embeddedfree allocation, per commodity code, are material. Smaller deviations can stillbe material on qualitative grounds, and the expectation is that errors foundduring verification are corrected before a report is finalised, not noted andwaved through.

Accreditation is a serious hurdle

For verification bodies, theguidance sets out what national accreditation bodies will examine: competence,independence, impartiality, and the procedures and documentation behind them.Accreditation runs for five years with annual surveillance reviews. Leadauditors must rotate after five consecutive years with a three-year cooling-offperiod, and verifiers must be registered in the CBAM registry before they canissue a valid verification report.

Why this matters beyond verifiers

Importers and their suppliersshould read this as a preview of their own experience. A verifier working toreasonable assurance, with a 5 per cent materiality line, cannot sign offemissions data held together by estimates and spreadsheet habits. Monitoringplans, meter records, precursor data and calculation methods will all need towithstand inspection, on site in the first year. Suppliers who prepare for thatlevel of scrutiny now will pass through it; those who improvise will generatefindings, corrections and delay at exactly the moment their EU customers needsigned reports.

‍