Compliance
Navigating the CBAM Accreditation Rules: What Verifiers & Importers Must Know
New EU guidance (24 Aug 2026) clarifies the role, responsibilities, and deadlines for verifiers and national bodies under the Carbon Border Adjustment Mechanism—critical for non-EU installations wishing to use verified emissions data in CBAM declarations.
By NomadicTax Research Team • 5-8 min read • September 15, 2026
## Overview of Updated CBAM Verification Rules
On **24 August 2026**, the European Commission published guidance for CBAM verifiers and National Accreditation Bodies (NABs) to clarify requirements under the **definitive period** of the Carbon Border Adjustment Mechanism (CBAM). This impacts non-EU installations exporting goods to the EU starting from **1 January 2026**. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/news/european-commission-publishes-guidance-cbam-verifiers-and-accreditation-bodies-2026-08-24_en?utm_source=openai))
### Key Deadlines & Process for Verifiers
- NABs must begin accrediting CBAM verifiers who meet defined technical, independence, and reliability standards. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-verification_en?utm_source=openai))
- Accredited verifiers are eligible to register in the CBAM Registry via the O3CI portal **as of 1 September 2026**. Importantly, they must register **within two months** of accreditation. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/news/european-commission-publishes-guidance-cbam-verifiers-and-accreditation-bodies-2026-08-24_en?utm_source=openai))
- The first verification reports may be issued in **January 2027**, allowing importers to use **actual verified emissions data** rather than default values. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/news/european-commission-publishes-guidance-cbam-verifiers-and-accreditation-bodies-2026-08-24_en?utm_source=openai))
### Implications for Importers & Non-EU Installation Operators
- **Default vs. verified emissions**: Until verifiers are duly accredited and reports issued, importers may have to rely on default emissions values. Using verified data requires timely accreditation and registration. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-legislation-and-guidance_en?utm_source=openai))
- **Recordkeeping & transparency**: Non-EU operators must monitor, calculate, and document embedded emissions according to CBAM methodology; verifiers then inspect these, including site visits if needed. Reports are submitted through the Registry. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-verification_en?utm_source=openai))
- **Accreditation fallback**: If a verifier is accredited in another EU or EEA country where accreditation is offered, non-EU operators/importers can still use that verification, provided the procedures are satisfied. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-verification_en?utm_source=openai))
### Actionable Checklist
- Identify the correct **National Accreditation Body** in your country (or an EU/EEA country) and understand their procedures for CBAM verifier accreditation. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-verification_en?utm_source=openai))
- Once accredited, register in CBAM Registry **by or after 1 September 2026** – don’t miss the two-month post-accreditation window. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/news/european-commission-publishes-guidance-cbam-verifiers-and-accreditation-bodies-2026-08-24_en?utm_source=openai))
- Prepare emissions monitoring and reporting systems to meet the verifier’s expected requirements: technical documentation, measurement methodologies, sampling, etc. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-verification_en?utm_source=openai))
- For importers: watch out for verification reports starting in **January 2027** so you can apply actual data instead of defaults in your CBAM declarations. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/news/european-commission-publishes-guidance-cbam-verifiers-and-accreditation-bodies-2026-08-24_en?utm_source=openai))
## Why This Matters
1. **Cost implications**: Using verified emissions (if realistic) may lower payable CBAM amounts compared to default values—so earlier accreditation and accurate reporting can yield savings.
2. **Regulatory certainty**: Clarity on timelines limits uncertainty both for verifiers and importers in adapting compliance systems.
3. **Trade competitiveness**: Non-EU exporters able to provide high‐quality evidence will be better placed in EU trade streams, especially as carbon pricing and climate policy intensify.
If you’re a non-EU producer exporting to the EU, or an EU importer, these steps are not optional—they’re essential to align with CBAM requirements and benefit from using verified emissions data.