Collecting accurate supplier emissions data is essential for CBAM compliance in the Definitive Phase (from 2026). Authorised declarants must report verified embedded emissions (direct and, where required, indirect) to calculate and surrender certificates. Actual installation-level data from suppliers is preferred over higher default values, as it can reduce costs.
How to collect supplier emissions data for CBAM compliance (step-by-step guide)
How to Collect Supplier Emissions Data for CBAM Compliance
Collecting accurate supplier emissions data is the foundation of successful CBAM compliance in the Definitive Phase that began on 1 January 2026. Authorised CBAM declarants must report embedded emissions in imported goods and surrender corresponding certificates. While default values remain available in limited cases, they are typically conservative and increase certificate costs. Using actual, verified CBAM data from suppliers can significantly reduce financial exposure and strengthen supply-chain relationships.
This practical guide explains how to collect CBAM data from non-EU suppliers step by step. It covers identification of priority suppliers, structured outreach, templates aligned with EU requirements, verification support, data validation, common challenges, and technology solutions. An FAQ section addresses frequent questions. With the first full annual declaration due by 30 September 2027 for 2026 imports, starting early is essential.
Why Supplier Emissions Data Matters in the Definitive Phase
Under CBAM, embedded emissions include direct emissions from processes and combustion. For some goods like steel and aluminium, it also includes indirect emissions from electricity use. Data needs to be calculated at the installation level following EU methods (in line with Monitoring and Cbam Reporting Regulation principles) and must be verified by approved third-party verifiers for actual values.
Default values often overstate emissions, especially for efficient or lower-carbon producers. Providing verified actual CBAM data allows declarants to report lower figures, reduce certificate purchases, and demonstrate due diligence. Suppliers who cannot or will not provide usable data force the use of defaults, effectively raising costs that buyers may pass upstream through price negotiations or supplier deselection.
Effective collection of CBAM data therefore protects margins, supports competitive positioning, and encourages decarbonisation across the value chain.
Step-by-Step Guide: How to Collect CBAM Data from Suppliers
1. Map Your Supply Chain and Identify Priority Suppliers
Start by listing all CBAM-covered goods (by CN code) imported into the EU. Track each back to the producer and supplier. First, focus on suppliers with high volume or high emissions, as they are responsible for most certificate liabilities. Often, using an 80/20 approach is effective: a few suppliers usually cause most emissions.
Divide suppliers based on their readiness (those already tracking emissions versus those who need help) and their commercial importance. This prioritization makes sure resources are used where changing from default to actual values has the biggest cost impact.
2. Assess Supplier Readiness and Build Relationships
Reach out to the right people like sustainability, EHS, plant operations, or technical managers, instead of general sales contacts who usually don’t have installation-level data. Clearly explain why you need the data, the commercial benefits of giving verified figures, and what happens if there are gaps (higher costs due to defaults).
Offer help: share guidance on EU methods, suggest accredited verifiers, or give training resources. Engaging early builds trust and gets better responses.
3. Send Structured, Template-Based Data Requests
Use the European Commission’s recommended communication templates (or closely aligned formats) so data arrives in a declaration-ready structure. A good request package typically includes:
- Clear deadlines and a named internal contact for questions.
- Required fields: installation details, production process/route, direct specific embedded emissions, indirect specific embedded emissions (where applicable), production volumes, methodology used, emission factors and sources, and any precursor data.
- Guidance on system boundaries and permitted use of defaults.
- A completed sample response to reduce formatting errors.
- Information on verification requirements and how data will be used.
Avoid free-form emails or unstructured spreadsheets. Structured templates minimise reconciliation work and verification risk.
4. Support Verification of Actual Emissions
From 2026, actual emissions data must be verified by independent verifiers accredited under CBAM rules (aligned with EU ETS principles). Importers should help suppliers identify suitable verifiers, understand monitoring plan requirements, and prepare evidence (utility bills, production logs, fuel records, etc.).
Verification reports provide reasonable assurance that calculations are correct and form a critical part of the audit trail. The first accredited CBAM verifiers became available progressively through 2026.
5. Validate, Track, and Integrate Incoming Data
Maintain a central log of outreach status, response rates, and data quality. Review every submission for:
- Installation-level granularity (not corporate averages).
- Correct methodology and system boundaries.
- Completeness of direct/indirect split and precursor emissions.
- Consistency with production volumes and supporting evidence.
Validate against EU rules before incorporating into the CBAM declaration. Tools that use automated checks, OCR, or AI-assisted extraction can significantly reduce manual effort and errors when processing messy source documents.
6. Handle Non-Responses and Escalate Strategically
A non-responding supplier is not neutral—it defaults the importer to higher values. Implement tiered follow-ups, offer third-party assistance, and, where necessary, explore alternative sourcing. Document all efforts for compliance and internal governance.
7. Leverage Technology and Ongoing Processes
Manual collection does not scale. Modern CBAM data platforms automate supplier portals, template distribution, reminders, data ingestion (including Excel uploads), validation, and calculation of embedded emissions and estimated certificate costs. Integration with customs/ERP systems further streamlines the process.
Treat data collection as a controlled annual process rather than a last-minute scramble. Quarterly internal reviews help maintain readiness for the September declaration deadline.
Best Practices and Common Pitfalls
Best practices:
- Start early and prioritise high-impact suppliers.
- Use official or aligned templates consistently.
- Combine commercial leverage with practical support.
- Maintain clear audit trails and data governance.
- Update requests as methodology guidance evolves.
Common pitfalls:
- Contacting the wrong people or sending vague requests.
- Accepting corporate averages instead of installation-level data.
- Underestimating verification timelines and capacity constraints.
- Failing to track and escalate non-responses.
- Relying solely on defaults without attempting actual data collection.
Challenges Specific to Complex Supply Chains
Multi-tier or multi-origin supply chains require cascading data requests (including for precursors). Confidentiality concerns, varying supplier maturity, language barriers, and limited verifier capacity in some regions add complexity. Digital platforms and industry-standardised templates help mitigate these issues.
Conclusion: Building a Robust CBAM Data Foundation
Mastering how to collect CBAM data from suppliers is no longer optional in the Definitive Phase—it is a core commercial and compliance capability. By systematically identifying priority suppliers, using structured templates, supporting verification, validating rigorously, and deploying appropriate tools, authorised declarants can reduce certificate costs, manage risk, and strengthen supply-chain resilience.
Treat supplier emissions data collection as an ongoing process rather than a one-off exercise. Start with high-impact relationships, provide clear guidance and support, and invest in systems that scale. Those who succeed will not only meet CBAM obligations but also gain better visibility into supply-chain carbon intensity, enabling more informed procurement and decarbonisation decisions.
The first major declaration cycle for 2026 imports is approaching. Begin or refine your supplier engagement programme today to ensure high-quality, verified CBAM data is available when needed.
Treat supplier emissions data collection as an ongoing process rather than a one-off exercise. Start with high-impact relationships, provide clear guidance and support, and invest in systems that scale. Those who succeed will not only meet CBAM obligations but also gain better visibility into supply-chain carbon intensity, enabling more informed procurement and decarbonisation decisions.
Also Read: How Does CBAM Change The Wires Industries
Frequently Asked Questions
What exactly is “CBAM data” that suppliers must provide?
Installation-level embedded emissions (direct and, where required, indirect), production process details, volumes, methodology, emission factors, and supporting evidence. For actual values, this must be verified.
Can I still use default values?
Yes, but they are generally higher and increase certificate costs. Actual verified data is preferred and often materially lower for efficient producers.
Who is responsible for verification?
The supplier/operator of the installation must obtain verification from an accredited CBAM verifier. The authorised declarant ensures the data used in the declaration is properly verified.
What if a supplier refuses or cannot provide data?
You may use default values for that portion. Document efforts to obtain actual data. Persistent gaps may lead to commercial discussions about pricing or continued sourcing.
How far in advance should I start collecting data?
Immediately and on an ongoing basis. Full-year 2026 data is needed for the 2027 declaration, and verification capacity can be constrained.
Are there official templates for requesting CBAM data?
Yes. The European Commission provides communication templates for installations. Align internal requests with these formats for compatibility with the CBAM Registry.
Do I need data for every shipment or can I use annual averages?
Data is typically collected and verified on a monitoring-period basis (often calendar year) at installation level and then allocated to the goods imported.
How can technology help with how to collect CBAM data?
Platforms automate requests, portals, validation, calculation, and integration with customs systems, reducing manual effort and improving data quality and audit readiness.
