Compliance
CBAM Verifiers & Importers: Complying With Carbon Border Rules From September 2026
As CBAM enters its definitive period, verifiers and non-EU importers face new accreditation, verification, and emissions reporting obligations that take effect from September 2026 — learn how to prepare.
By NomadicTax Research Team • 5-8 min read • August 23, 2026
## Overview: CBAM’s Definitive Period
The **Carbon Border Adjustment Mechanism (CBAM)** is now in its definitive period. This means all rules designed to prevent carbon leakage — including accreditation of verifiers, emission reporting, and handling default vs actual emission values — are fully live or entering into effect. Key updates were published on **14 August 2026**. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-communication-and-news_en?utm_source=openai))
## New Verification & Accreditation Obligations
- **From 1 September 2026**, verifiers must create an **EU Login Account** and join the **CBAM Registry**, then apply via their **National Competent Authority (NCA)**. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/news/cbam-webinar-follow-become-cbam-verifier-all-about-accreditation-and-verification-2026-07-31_en?utm_source=openai))
- Verifiers also need to adopt updated methodologies — particularly how to define **functional units**, handle **multifunctional processes**, calculate embedded emissions for **precursors**, and set **system boundaries** for iron, steel, aluminium products. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/news/cbam-webinar-follow-become-cbam-verifier-all-about-accreditation-and-verification-2026-07-31_en?utm_source=openai))
## Reporting Emissions: Default vs Actual Values
- Importers declare emissions for goods covered under CBAM goods categories. They can use either **default values** (as set by regulation) or **actual verified values** (if available). Default values have been **corrected** via implementing regulations (EU 2026/1740). ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-communication-and-news_en?utm_source=openai))
- First full declarations are due **30 September 2027**, covering emissions embedded in imports during 2026. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-communication-and-news_en?utm_source=openai))
## Who Needs to Act & How
### Importers inside the EU or their indirect customs representatives
- Ensure registration under CBAM if you import goods exceeding thresholds, starting 2026 imports. Make sure proper CBAM account numbers or application references are in place. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-communication-and-news_en?utm_source=openai))
### Verifiers (third-party & non-EU)
- Secure accreditation via relevant NCA. Ensure understanding of updated guidance documents and webinars (latest held 16 July 2026). ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/news/cbam-webinar-follow-become-cbam-verifier-all-about-accreditation-and-verification-2026-07-31_en?utm_source=openai))
### Non-EU producers
- If clients import your goods into the EU claiming actual values, expect to supply accurate, verified emissions data, conforming to EU-recognized verification criteria. Use default values only where verification isn’t feasible. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-communication-and-news_en?utm_source=openai))
## Practical Compliance Tips
- Map your product lines to CBAM categories early: iron, steel, aluminium, others; identify functional units and production process boundaries.
- Develop data collection systems: gather emissions metrics at origin, ensure transparency in chain of custody and emissions audits.
- Coordinate with verifiers: identify certified bodies early; delays in accreditation could bottleneck operations.
- Review costs: CBAM certificates, verification fees, potential price adjustments – plan these into import costs or supply contracts.
## Example Scenario
A manufacturer in Turkey exporting steel parts to Germany:
- Needs to ensure a certified verifier is in place starting 1 September 2026;
- Must collect data to calculate **actual emissions**; if not feasible, use default values (but with awareness of what corrections have been made);
- Prepare to make the first full emission declaration by **30 September 2027**, covering emissions from 2026 imports. Depend on accurate boundary definitions and functional units. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism/cbam-communication-and-news_en?utm_source=openai))
**Bottom line**: CBAM’s new regime tightens environmental compliance across the supply chain. Verifiers, importers and producers should start doing their homework now — good data, certified methodologies, and clear supply contracts will pay off.