CBAM compliance for exporters: the EU carbon border adjustment
What CBAM covers, how embedded-emissions reporting actually works, the sector-by-sector phase-in, and what exporters must build into their data pipelines now.
CBAM compliance for exporters requires three operational moves: prove your products' embedded emissions at installation level, pass those figures to EU customers in the format they need, and retain evidence to support verification and any carbon price deductions.
You are in a reporting-only phase that still shapes your 2026 pricing. EU importers will compare your actual data with CBAM default values and with competitors, then factor certificate costs linked to EU ETS prices into offers. CBAM shifts buyer choice toward lower embedded carbon. Get your CN codes right, establish monitoring for direct and indirect emissions, and prepare documentation for audits and Article 9 deductions.
What is CBAM and why should exporters care?
CBAM is the EU's carbon border adjustment mechanism created by Regulation (EU) 2023/956. It mirrors the EU ETS cost on certain carbon-intensive imports and prevents carbon leakage.
The commercial impact is direct: EU importers will price in CBAM certificate costs when they buy from you or will favor lower-carbon alternatives. Accurate data lowers their CBAM liability and keeps you competitive.
The timeline splits into two phases. The transitional period runs from 1 October 2023 to 31 December 2025 with reporting only. The definitive period begins 1 January 2026 with mandatory certificate purchase.
How CBAM changes the EU import equation
Importers must purchase CBAM certificates corresponding to embedded emissions of each imported product. The certificate price equals the weekly average EU ETS auction price. In 2024, this ranged between €50 and €100 per tonne CO2.
Expect pass-through. Importers will negotiate price reductions, switch suppliers, or re-specify orders.
If you do not provide verified actual emissions, importers can use CBAM default values that include a conservative markup. That typically produces a higher CBAM cost than your true performance.
Illustrative example: Hot-rolled flat steel (CN 7208) from an integrated mill might show 2.1 tCO2e per tonne with actual data versus approximately 2.5 tCO2e using default values. At €90 per tonne CO2, the CBAM cost difference is €189 versus €225 per tonne. That €36 per tonne spread can decide a tender outcome.
Which products fall under CBAM scope?
CBAM covers six sectors: iron and steel, aluminium, cement, fertilizers, electricity, and hydrogen.
Classification is by CN code. Check HS chapters 25 (cement), 28 (hydrogen and certain chemicals), 31 (fertilizers), 72-73 (iron and steel), 76 (aluminium), and 27 for electricity (CN 2716 00 00).
Certain processed iron and steel products in Chapter 73 are included. Composite products are in scope only if their CN code is listed in Annex I.
The Commission will review scope by 2025. Organic chemicals and plastics are under assessment for potential expansion.
| Sector | HS Chapters | Example CN Codes | Key Products |
|---|---|---|---|
| Iron and steel | 72, 73 | 7207, 7208, 7213, 7304 | Billets, hot-rolled coil, wire rod, seamless tubes |
| Aluminium | 76 | 7601, 7606 | Unwrought aluminium, plates and sheets |
| Cement | 25 | 2523 | Portland cement, clinite |
| Fertilizers | 31 | 3102, 3103, 3104, 3105 | Nitrogen, phosphatic, potassic fertilizers |
| Electricity | 27 | 2716 00 00 | Electrical energy |
| Hydrogen | 28 | 2804 10 | Hydrogen gas |
CN code classification for CBAM products
Map your CN codes against Annex I categories. For steel, Annex I lists many 72 and 73 headings with product-specific notes.
Composite or kit products create allocation questions. If a finished good is not listed in Annex I, it falls outside CBAM even if it contains in-scope inputs.
For borderline cases, request Binding Tariff Information from EU customs to fix classification before contracting.
What are your obligations during the transitional period (2023-2025)?
No financial payment yet. This phase is reporting only.
EU importers must submit quarterly CBAM reports via the Transitional Registry. Deadlines fall at the end of the month following each quarter. Importers will request embedded emissions data from you to complete those reports.
Non-compliance penalties apply to importers at €10-50 per tonne of unreported emissions. This makes your data quality a commercial priority for them.
- STEP 01Collect emissions data
- STEP 02Format per CBAM requirements
- STEP 03Receives and validates data
- STEP 04Quarterly report submission
- STEP 05Review and enforcement
What data will EU importers request from you?
Expect requests for:
- Installation identification and location
- Production process description
- Direct emissions from production, including fuel combustion and process emissions
- Indirect emissions from electricity consumption
- Specific embedded emissions per tonne of each CN product
- Carbon price already paid in the country of origin, if any, with documentation
How to respond to importer data requests
Use Commission templates and formats from CBAM guidance to align units, boundaries, and allocation rules.
Clarify verification status. If unverified during the transitional period, flag your plan and timing for verification.
Protect confidential data with contract clauses that limit use to CBAM reporting, require safeguards, and provide correction rights.
Set expectations. A practical turnaround is 2-6 weeks once metering and allocation datasets are in place.
What changes in the definitive period (2026 onwards)?
Importers must become authorized CBAM declarants and buy CBAM certificates priced at the weekly average EU ETS auction price.
Annual CBAM declarations will replace quarterly transitional reports.
Free allocation of EU ETS allowances to EU producers of CBAM goods will phase out, increasing the share of emissions covered by CBAM on imports.
Your actual embedded emissions and any eligible carbon price deductions will directly affect your customer's certificate volume and cost.
How free allocation phase-out affects your exports
The phase-out schedule for CBAM sectors reduces free allocation as follows:
| Year | Cumulative Reduction | CBAM Coverage |
|---|---|---|
| 2026 | 2.5% | 2.5% |
| 2027 | 5% | 5% |
| 2028 | 10% | 10% |
| 2029 | 22.5% | 22.5% |
| 2030 | 48.5% | 48.5% |
| 2031 | 61% | 61% |
| 2032 | 73.5% | 73.5% |
| 2033 | 86% | 86% |
| 2034 | 100% | 100% |
As free allocation declines, the portion of emissions subject to CBAM rises. This increases the importance of your emissions intensity gap versus competitors.
Strategy: prioritize early emissions reduction at installations serving the EU to lock in a widening cost advantage over 2026-2034.
How do you calculate embedded emissions?
Embedded emissions equals direct emissions plus indirect emissions for the product boundary defined in the CBAM Implementing Regulation.
Direct emissions cover fuel combustion and process emissions at the installation attributable to the product. Indirect emissions equal electricity consumption multiplied by the relevant grid emission factor or eligible contractual instrument factor.
Calculate at installation level, then allocate to product level using mass or energy-based allocation keys where lines are shared.
Direct emissions calculation step by step
Gather fuel consumption by type and period from calibrated meters.
Apply correct emission factors for each fuel. Document higher heating value and carbon content.
Quantify process emissions from chemical reactions, for example calcination in cement or anode consumption in aluminium.
Allocate to products using physical allocation, for example by mass output per line, or validated surrogate drivers. Maintain auditable calculation files.
Indirect emissions from electricity
Multiply metered electricity consumed for the product by the applicable grid emission factor for the country or region of generation. Use official factors where available.
Contractual instruments, for example power purchase agreements or certificates, can reduce the factor only if they meet CBAM criteria on temporal, geographic, and additionality matching. Keep proof of origin and allocation.
Country examples based on IEA data: South Africa grid factor typically exceeds 0.9 kgCO2/kWh, China runs around 0.5-0.6 kgCO2/kWh, Norway approaches zero due to hydropower. Use the factor that CBAM accepts for your case with evidence.
When default values apply, and why you should avoid them
Default values are conservative averages with a markup used when actual data are unavailable or unverified. They typically exceed well-performing installations.
Importers using defaults pay more for CBAM certificates, which hurts your price position against suppliers who document actuals.
Business case: invest in metering, data systems, and early verification to unlock lower CBAM costs and stronger win rates.
Can you reduce CBAM liability through carbon price deductions?
Yes. Article 9 allows deduction for a carbon price already paid in the country of origin for the embedded emissions in the imported goods.
Eligible instruments include explicit carbon taxes, emissions trading systems, or equivalent schemes. The deduction equals the eligible carbon price paid multiplied by the embedded emissions, with no double counting where rebates or free allocation apply.
Which carbon pricing systems qualify for deductions?
National carbon taxes with an explicit price per tonne CO2 may qualify, for example South Africa's Carbon Tax.
Emissions trading systems with allowance purchase and surrender records may also qualify, for example UK ETS, Korea K-ETS, or Switzerland ETS. Specific eligibility for CBAM deductions depends on Commission implementing decisions.
Use OECD Effective Carbon Rates as a reference for identifying explicit prices, then confirm legal eligibility and traceability to your installation.
| System Type | Examples | Documentation Required | Eligibility Status |
|---|---|---|---|
| Carbon Tax | South Africa Carbon Tax | Official payment receipts, rate certificates | Subject to Commission confirmation |
| Emissions Trading | UK ETS, Switzerland ETS | Allowance purchase records, surrender documentation | Likely eligible (Switzerland linked to EU ETS) |
| Emissions Trading | Korea K-ETS, China National ETS | Allowance purchase records | Subject to Commission confirmation |
Documentation requirements for carbon price deductions
Gather official receipts or certificates proving carbon tax or ETS allowance costs paid for the specific period.
Provide evidence that no free allocation, export rebate, or exemption reduced that cost.
Establish traceability linking the payment to the installation and the exported product batch.
Prepare for independent verification of the deduction evidence alongside emissions data where required.
What are the verification requirements for third-country installations?
To have actual emissions accepted in the definitive period, data must be verified by accredited verifiers that meet EU standards.
The Commission is preparing pathways for third-country verifier accreditation. Guidance is anticipated in 2025, though timing remains subject to confirmation. Until then, EU-accredited verifiers can conduct remote or on-site verification if they can obtain sufficient evidence.
Preparing your installation for verification
Documentation: Maintain meter calibration records, data logs, emission factor sources, allocation workpapers, and management approvals.
Monitoring systems: Implement procedures that align to CBAM Annex III, including periodic reconciliations and change control.
Internal audits: Run a mock verification over one quarter to test traceability from invoice to meter and to product.
Verifier selection: Assess sector experience, language coverage, site access logistics, and data security commitments.
How should you structure supply chain communications?
Proactive communication signals reliability and reduces buyer risk. Send a CBAM data pack that mirrors Commission templates and shows verification status.
Formalize data sharing with contract clauses that align accuracy obligations, liability, and confidentiality.
Coordinate timelines so your data handover precedes importer reporting deadlines.
Contractual provisions for CBAM data sharing
Include in customer agreements:
- Data accuracy warranties with clear limitations and reliance conditions
- Liability allocation and cure periods for incorrect emissions data
- Confidentiality and permitted use only for CBAM compliance and auditing
- Update and correction procedures on a defined cadence
Building CBAM compliance into customer relationships
Position your verified low embedded emissions as a commercial differentiator in tenders.
Co-plan for 2026, including annual declaration calendars, verifier scheduling, and change controls.
Share emissions reduction roadmaps for specific CN products to support multi-year contracts.
For related guidance on managing EU regulatory requirements, see our tariffs and compliance pillar and carbon pricing fundamentals.
CBAM exporter compliance checklist
Immediate actions (now):
- Confirm CN codes and whether products are in Annex I
- Map EU customers and their CBAM reporting calendars
- Baseline direct and indirect emissions at installation level
Short-term (2025):
- Implement monitoring aligned to Annex III
- Respond to importer quarterly data requests on time
- Decide on verification pathway and prepare documentation
Medium-term (2026 and after):
- Execute verification for definitive period acceptance
- Put data sharing and liability terms into supply contracts
- Pursue Article 9 carbon price deductions where eligible
- Invest in process and energy changes that lower embedded emissions
Ongoing:
- Track EU ETS price trends that set certificate costs
- Monitor CBAM scope expansion and guidance updates
- Maintain verifier-ready records and controls