Alex Wang – Senior Quality & Compliance Engineer at Welle Inspection, with 8+ years of experience in EU carbon regulations and CBAM compliance. Alex has successfully guided over 150 EU importers and China-based suppliers through CBAM reporting and emissions data collection, making him one of the most experienced practitioners in the field.
Introduction: CBAM Compliance Is About Supply Chain Execution
For European importers, the EU’s Carbon Border Adjustment Mechanism (CBAM) is no longer just a regulation—it is a practical supply chain challenge. Starting 2026, importers are financially responsible for the embedded carbon emissions of imported goods, particularly when sourcing from non-EU suppliers such as China.
The real challenge lies not in reading regulations, but in how to prepare CBAM report that is accurate, verifiable, and aligned with EU requirements. Collecting plant-level emissions data, validating supplier inputs, managing reporting risks, and minimizing reliance on default values are all essential.
As a China-based inspection & engineering partner, we support importers in implementing CBAM compliance on the ground. We do not provide carbon consulting or certification services; our role is operational support through technical checks, supplier engagement, and on-site verification to ensure CBAM readiness.
This CBAM reporting checklist guides importers through actionable steps while highlighting where inspection and engineering support provides the most value.
What CBAM Means for Global Trade
The EU’s CBAM, effective from 2026, introduces a carbon tariff on imports such as steel, cement, and aluminum. Its primary goals are to level the playing field for EU businesses, prevent “carbon leakage,” and encourage cleaner production globally. CBAM directly affects supply chains, increases transparency, shifts trade flows, and creates new operational and reporting requirements for non-EU producers.
Understanding CBAM reporting requirements explained is crucial for importers to minimize financial risk, maintain competitiveness, and comply with EU obligations.
Key Operational Impacts for Importers:
Level Playing Field: Prevents EU companies from being undercut by high-carbon imports.
Carbon Leakage Prevention: Discourages relocation to countries with weaker climate policies.
Decarbonization Incentives: Puts a price on carbon for imports, motivating exporters to adopt greener production methods.
Reporting & Compliance: Importers and suppliers must track embedded emissions using robust carbon accounting systems.
Financial Costs: CBAM certificates are a direct cost linked to EU ETS prices, making accurate CBAM emissions calculation method critical.
Supply Chain Rewiring: Companies may favor low-carbon suppliers, cleaner production methods, or local alternatives.
Trade Friction: Some exporting countries, particularly high-carbon producers, may face disputes or higher costs.
Global Precedent: CBAM sets a benchmark for carbon pricing in international trade and may inspire similar mechanisms elsewhere.
Why Supplier Emissions Data Is Critical
Verified, plant-level supplier data is essential for CBAM compliance. Missing or unverifiable data forces reliance on default values, which increases certificate costs and operational uncertainty.
We help importers by:
Collecting emissions data at the production site
Validating consistency with actual production volumes
Training and supporting suppliers to provide accurate CBAM inputs
Accurate supplier data improves transparency, reduces reliance on defaults, strengthens supplier relationships, and enhances operational insights for more efficient reporting. Scope 3 emissions often make up the majority of an importer’s carbon footprint, making granular data key for risk mitigation, cost management, and operational efficiency.
The importance of supplier emissions data has grown due to new regulations like the EU’s CSRD, SEC disclosure rules, and other mandatory reporting standards. Companies that leverage this data can identify high-impact suppliers, anticipate climate-related risks, improve efficiency through energy and waste reductions, and implement targeted actions on high-emitting suppliers. Accurate emissions data enhances credibility, builds trust with investors and customers, and provides a competitive advantage, as suppliers with verified carbon data gain preferred status.
CBAM Reporting Requirements and Timeline
CBAM is being rolled out in phases to give businesses time to adapt to new requirements. Each phase introduces progressively stricter obligations on both reporting and financial compliance.
Transitional Phase (Oct 1, 2023 – Dec 31, 2025)
During this period, EU importers (declarants) must submit CBAM quarterly reporting EU covering embedded greenhouse gas emissions of imported CBAM goods. No financial transactions are required yet, but accurate reporting is mandatory.
This phase allows companies to build reporting systems, engage suppliers, and ensure emissions data is available and verifiable. Early compliance reduces reliance on default values and prepares for the definitive phase.
Definitive Phase (From Jan 1, 2026)
In the definitive phase:
CBAM certificates must be purchased and surrendered annually for verified embedded emissions.
Under the EU CBAM Omnibus Simplification Regulation, declarants can choose between EU default values or actual supplier data. Using supplier data reduces costs because default values include a mark-up.
Reporting becomes annual, with the first annual declaration due by August 31, 2027.
Third-party verification is mandatory: reports must be verified by accredited third parties, and suppliers must share verified emissions data with importers.
Certificate purchases start in February 2027 and must be surrendered by September 30, 2027. Certificates are priced weekly based on EU ETS averages.
Importers must maintain at least 50% of the embedded emissions as CBAM certificates at the end of each quarter.
The CBAM scope will expand over time to include more CN codes and product types.
These requirements highlight the importance of CBAM emissions calculation steel and other CBAM-covered products, early supplier engagement, and integrated tracking systems.
How EU Importers Comply: CBAM Reporting Checklist
Navigating the EU CBAM (Carbon Border Adjustment Mechanism) can be complex, but a structured step-by-step approach helps importers ensure CBAM compliance, reduce costs, and manage embedded emissions effectively. This guide covers Phase 1 – Preparation and Phase 2 – Definitive Compliance, integrating the latest CBAM regulations and reporting requirements.
Phase 1 – Preparation & Data Collection (Transitional Phase 2023–2025)
Step 1 – Identify Products & Scope
Importers must confirm which imported goods fall under CBAM and verify CN codes across suppliers and shipments. Misclassification can force default emission values, increasing costs. We support by reviewing supplier product lists, cross-checking invoices, and auditing semi-finished goods to ensure CBAM scope alignment.
Step 2 – Understand Requirements
Translating regulatory obligations into internal workflows is critical. We help map responsibilities, set up reporting processes, and align supplier data collection to prevent last-minute errors during quarterly reporting.
Step 3 – Track Embedded Emissions
Collecting plant-level Scope 1 & 2 emissions is complex. Many suppliers lack carbon accounting systems, and data is often scattered across departments. Our engineers audit production processes on-site, validate energy and output data, and ensure reporting reflects actual operations.
Step 4 – Verify Data
Verification readiness starts early. We perform pre-verification checks, trace emissions to production records, confirm mass balance, and document findings, reducing dependency on default values in the definitive phase.
Step 5 – Register as an Authorized Declarant
Registration ensures legal compliance and certificate management readiness. We guide clients to prepare documentation, confirm legal entity alignment, and coordinate with customs and registry systems.
Phase 2 – Definitive Compliance (From January 2026)
Step 6 – Calculate & Collect Embedded Emissions
With CBAM certificates now carrying financial weight, data accuracy impacts working capital, certificate purchases, and quarterly compliance. We assist importers by aggregating verified emissions, consolidating supplier inputs, and aligning calculations with EU regulations.
Step 7 – Verify Data
Independent third-party verification is mandatory. We prepare and support verification processes, ensuring data passes methodology checks, cross-validation, and auditing requirements. Suppliers unable to provide verified data are flagged early for mitigation.
Step 8 – Make Annual Declarations
Annual declarations consolidate emissions, verification reports, CN codes, and certificate calculations. We review submissions, reconcile inconsistencies, and support reporting to the EU CBAM Registry.
Step 9 – Purchase CBAM Certificates
Certificates reflect the carbon cost of imports. We help monitor ETS prices, track deductions for carbon costs paid locally, and manage quarterly balances to optimize financial impact.
Step 10 – Surrender Certificates & Maintain Records
Compliance does not end at submission. We archive supplier data, verification documents, declarations, and certificates, ensuring audit readiness and regulatory traceability.
Start Your CBAM Report Preparation
Common CBAM Reporting Challenges
Common CBAM reporting challenges stem from complex and manual data collection from suppliers, lack of standardized methods, confidentiality concerns, limited platform accessibility/usability, and insufficient internal carbon accounting expertise. These issues often lead to reliance on default estimates, increased costs, and potential non-compliance—especially for SMEs. Key pain points include obtaining accurate, installation-specific emissions data from non-EU producers and navigating unclear instructions in the EU digital registry.
Data Collection & Supply Chain
Supplier Data Gaps: Difficulty obtaining detailed, verified emissions data; suppliers may lack tools or willingness to share sensitive info.
Lack of Standardization: No unified data request method, causing inconsistencies and delays.
Confidentiality Concerns: Suppliers hesitant to share proprietary production data.
Cross-Functional Effort: Data scattered across procurement, operations, and IT, requiring significant coordination.
Technical & Administrative Hurdles
Platform Complexity: CBAM reporting portal and registry can be hard to navigate, with limited language support.
Manual Processes: Heavy reliance on manual entry increases errors and workload.
Unclear Instructions: Ambiguity in submission rules, particularly for declarants acting on behalf of others.
Knowledge & Capacity Gaps
Carbon Accounting Expertise: Many importers lack familiarity with complex EU carbon accounting rules.
SME Burden: Disproportionate administrative and cost pressures for smaller businesses.
Awareness: General lack of understanding about CBAM obligations.
Data Quality & Accuracy
Reliance on Defaults: Using estimated/default values when primary data is unavailable, though this is gradually evolving.
Verification Challenges: Ensuring accuracy and audit readiness remains a key concern.
Solutions & Outlook
Automation: Implementing digital tools to streamline data collection and submission.
Supplier Engagement: Developing clear protocols and training suppliers to improve data quality.
Regulatory Adjustments: EU initiatives—such as raising thresholds and simplifying default values—aim to ease reporting burdens (Institute for European Environmental Policy)
FAQs on CBAM
Q1: What are the CBAM reporting requirements?
Importers must submit accurate reports on Scope 1 & 2 emissions of imported goods such as steel, cement, aluminum, fertilizers, electricity, and hydrogen. During the transitional phase (Oct 2023 – Dec 2025), reporting is quarterly. From 2026, reporting becomes annual with mandatory third-party verification and CBAM certificate purchases.
Q2: How are CBAM emissions calculated for imports?
CBAM emissions are calculated based on plant-level energy consumption, production output, and emission factors for Scope 1 & 2. Default EU values can be used if supplier data is unavailable, but verified supplier data is preferred to minimize costs. Accurate calculation is critical for CBAM certificate volume and financial planning.
Q3: How does the CBAM reporting transitional phase differ from definitive compliance?
The transitional phase focuses on quarterly reporting without financial obligations, allowing importers to prepare systems and engage suppliers. Definitive compliance (from Jan 2026) requires annual reporting, certificate purchase, and third-party verification, making accurate emissions data financially important.
Q4: What are common CBAM reporting challenges?
Challenges include missing supplier data, lack of standardized data collection, confidentiality concerns, platform usability issues, and limited internal carbon accounting expertise. These can lead to reliance on default values, higher costs, or non-compliance risks.
Q5: How can importers ensure accurate CBAM emissions data?
Importers should engage suppliers early, collect verified plant-level emissions data, perform pre-verification checks, and use digital reporting tools. Partnering with a China-based inspection & engineering service can help validate data, perform on-site checks, and prepare for third-party verification.