CBAM: Monitoring the Single Mass-Based Threshold
Quick answer
EU importers exceeding the single mass-based threshold for carbon-intensive goods must obtain authorised CBAM declarant status before continuing imports. Customs authorities and the Commission monitor compliance via data exchange through the CBAM registry, with enforcement measures for non-compliance, including penalties and decisions to compel authorisation [1][2][3].
Key takeaways
- The single mass-based threshold triggers mandatory authorisation as a CBAM declarant for importers of certain goods into the EU [3:1].
- Importers must apply for authorised CBAM declarant status before exceeding the threshold to avoid penalties [3:2].
- Customs authorities and the European Commission monitor imports and compliance using interconnected electronic systems, including the CBAM registry [1:1][4].
- Non-genuine practices aimed at circumventing the threshold are disregarded and considered serious infringements [1:2][5][6].
- Authorised CBAM declarants may delegate declaration submission to third parties with appropriate credentials, but remain responsible for compliance [3:3].
- The monitoring system involves automatic data exchange and risk analysis to identify importers nearing or exceeding the threshold [1:3][6:1].
Who Must Become an Authorised CBAM Declarant?
Under Regulation (EU) 2023/956, as amended by Regulation (EU) 2025/2083, any importer established in the EU who expects to exceed the annual single mass-based threshold for imports of goods listed in Annex I must apply for and obtain the status of authorised CBAM declarant before surpassing that threshold [3:4]. This requirement ensures that importers are registered and compliant with CBAM obligations, which include reporting embedded emissions and paying corresponding carbon costs.
The single mass-based threshold applies cumulatively to all goods imported by the same importer within a calendar year. Importers who do not obtain authorisation before exceeding the threshold face penalties and enforcement actions [3:5]. The obligation applies regardless of whether the importer uses direct or indirect customs representatives; in cases where indirect representatives are involved, they are also informed by competent authorities when the threshold is exceeded [1:4].
Importers must hold an Economic Operators Registration and Identification (EORI) number and be established in an EU Member State to qualify for authorisation. This ensures traceability and accountability within the EU single market [3:6].
The Single Mass-Based Threshold: What It Means for Importers
The single mass-based threshold is a quantitative limit on the total mass of carbon-intensive goods imported into the EU by a single importer over one calendar year. If an importer’s cumulative imports exceed this threshold, they must comply with CBAM reporting and payment obligations by becoming an authorised CBAM declarant [3:7].
In practice, this means that importers must monitor their import volumes continuously throughout the year. They should maintain accurate records of the goods’ quantities, classifications (using the Combined Nomenclature codes), and carbon content to anticipate when the threshold may be approached or exceeded [4:1].
Failing to track imports against this threshold can lead to non-compliance risks, including enforcement actions by national competent authorities. Therefore, importers should implement internal controls and reporting systems aligned with CBAM requirements to ensure timely application for authorisation and avoid disruptions to their supply chains [3:8].
Monitoring and Enforcement: How Authorities Track Imports
The European Commission and the competent authorities of the Member States where importers are established jointly monitor compliance with the single mass-based threshold [1:5]. This monitoring relies on automatic and periodic exchange of information via the CBAM registry, which is interconnected with customs surveillance systems and risk management platforms [4:2].
Customs authorities communicate detailed import data to the Commission, including the importer’s EORI number, the eight-digit Combined Nomenclature code of the goods, quantities, country of origin, customs declaration dates, and procedures applied [2:1]. This data enables the Commission to identify importers approaching or exceeding 90% of the threshold and to conduct preliminary assessments.
If the Commission’s assessment indicates that an importer has exceeded the threshold without authorisation, it informs the competent authority of the Member State where the importer is established. The competent authority may then request documentary evidence from the importer or customs authorities to verify the situation [1:6].
Upon confirmation, the competent authority issues a decision stating that the importer has exceeded the threshold and informs the importer of their obligations, including the need to obtain authorised CBAM declarant status before further imports. This decision is communicated to customs authorities and the Commission via the CBAM registry [1:7].
Importers have the right to appeal such decisions; however, the appeal does not suspend the enforcement of the decision [1:8].
Consequences of Exceeding the Threshold Without Authorisation
Importers who exceed the single mass-based threshold without obtaining authorised CBAM declarant status face significant consequences. The competent authority will issue a formal decision confirming the breach, which includes information on the right to appeal and the obligations to comply with CBAM regulations [1:9].
Penalties apply to importers who fail to secure authorisation before exceeding the threshold, as established in Regulation (EU) 2025/2083. These penalties aim to deter non-compliance and ensure the integrity of the CBAM system [3:9].
Moreover, exceeding the threshold without authorisation may trigger enhanced scrutiny by customs and competent authorities, including requests for documentary evidence and potential audits. Continued non-compliance can lead to further administrative or legal sanctions depending on the Member State’s enforcement framework [1:10].
The system also ensures that importers cannot circumvent obligations by splitting shipments or using indirect customs representatives to remain below the threshold. Authorities monitor such practices closely, and importers found engaging in non-genuine arrangements to avoid CBAM requirements are subject to serious infringement proceedings [1:11][5:1][6:2].
Avoiding Non-Genuine Practices to Circumvent the Threshold
Regulation (EU) 2023/956 and its amendment by Regulation (EU) 2025/2083 explicitly prohibit practices, arrangements, or series thereof that have as their main purpose the artificial reduction of imports below the single mass-based threshold without valid commercial reasons [1:12][6:3].
Such non-genuine practices are disregarded for the purpose of determining whether the threshold has been exceeded. If a competent authority concludes that an importer has engaged in such behaviour, this constitutes a serious infringement of the CBAM Regulation, subject to penalties and enforcement actions [5:2][6:4].
Examples of non-genuine practices may include artificially splitting shipments, using multiple importers without economic justification, or manipulating customs procedures solely to avoid CBAM obligations. Importers must ensure that their import operations reflect genuine commercial activities and maintain transparent documentation to demonstrate compliance [1:13].
Maintaining robust aml watchlist screening and due diligence processes can help companies detect and prevent indirect risks related to non-genuine practices, including potential involvement of sanctioned or high-risk entities in their supply chains [1:14].
Interconnected Systems: Data Exchange and Risk Analysis
Effective monitoring of the single mass-based threshold relies on interconnected IT systems enabling seamless data exchange between customs authorities, competent national authorities, and the European Commission [4:3].
The CBAM registry is linked with the EU’s customs surveillance system (SURV3), the EU Single Window Environment, and the Customs Risk Management System (CRMS2). These integrations facilitate the retrieval of customs import declarations, classification of goods using Combined Nomenclature codes, and the exchange of risk information [4:4].
The Commission performs periodic risk analyses based on data from the CBAM registry, customs declarations, and other sources to identify specific risk factors and points of attention related to threshold compliance. These risk analyses inform the competent authorities and customs administrations to focus controls and enforcement efforts effectively [1:15][6:5].
Such comprehensive data exchange and risk management frameworks support aml watchlist screening by enabling authorities and importers to identify suspicious patterns, potential circumvention, or involvement of high-risk actors in the supply chain, thereby strengthening overall compliance with CBAM and related trade regulations [1:16].
FAQ
What is the CBAM single mass-based threshold?
It is the annual cumulative mass limit of certain carbon-intensive goods imported into the EU by a single importer. Exceeding this threshold triggers mandatory CBAM compliance obligations, including becoming an authorised CBAM declarant [3:10].
When do I need to apply for authorised CBAM declarant status?
Importers expecting to exceed the single mass-based threshold must apply for authorisation before surpassing it. Failure to do so may result in penalties and enforcement actions [3:11].
What happens if I exceed the CBAM threshold without authorisation?
The competent authority will issue a decision confirming the breach, inform the importer of obligations, and penalties may be imposed. Appeals do not suspend enforcement [1:17][3:12].
How do customs authorities monitor CBAM compliance?
Authorities monitor imports through automatic data exchange via the CBAM registry linked with customs surveillance and risk management systems. They track import volumes, classifications, and importer identities to detect threshold exceedances [1:18][2:2][4:5].
What are non-genuine practices under CBAM?
Non-genuine practices are arrangements designed primarily to avoid exceeding the threshold without valid commercial reasons. Such practices are disregarded and constitute serious infringements subject to penalties [1:19][5:3][6:6].
Can a third party submit CBAM declarations on my behalf?
Yes, authorised CBAM declarants may delegate submission to third parties who hold an EORI number and are established in an EU Member State. However, the authorised declarant remains responsible for compliance [3:13].
This article provides general information on CBAM compliance related to the single mass-based threshold and aml watchlist screening. EU businesses should consult qualified legal counsel or their national competent authority for advice tailored to their specific circumstances.
