Myths vs. realities: Carbon border adjustment mechanism (CBAM) implementation — what the evidence actually supports

The European Union's Carbon Border Adjustment Mechanism began its transitional phase in October 2023, and by January 2026, importers had submitted over 3.2 million quarterly CBAM reports covering approximately EUR 170 billion in affected goods, according to the European Commission's third annual CBAM status report (European Commission, 2026). Yet despite this volume of real-world data, persistent myths continue to shape boardroom decisions, investor assessments, and trade policy debates. A 2025 survey by the International Chamber of Commerce found that 61% of multinational companies operating in CBAM-affected sectors hold at least one significant misconception about the mechanism's scope, cost, or timeline. For investors evaluating exposure across industrial portfolios, separating evidence from assumption is not optional: it is the difference between accurate risk pricing and portfolio surprises.

Why It Matters

CBAM represents the most consequential intersection of climate policy and trade regulation in decades. Beginning January 2026, EU importers of cement, iron and steel, aluminum, fertilizers, electricity, and hydrogen must purchase CBAM certificates reflecting the embedded carbon in their imports, priced at the weekly average EU Emissions Trading System (ETS) allowance price. With EU ETS carbon prices averaging EUR 65 to EUR 80 per tonne through 2025, the financial implications are substantial: the European Commission estimates annual CBAM certificate revenues of EUR 9 to EUR 14 billion once the mechanism reaches full implementation in 2034 (European Commission, 2025).

For US-based investors, the stakes are particularly acute. US exports of steel, aluminum, and fertilizers to the EU totaled approximately $18 billion in 2025 (US Census Bureau, 2025). American producers operating without a domestic carbon price face the full CBAM levy on embedded emissions, while competitors in jurisdictions with equivalent carbon pricing can deduct those costs. Understanding which claims about CBAM are grounded in evidence and which reflect lobbying narratives or wishful thinking is essential for accurate portfolio positioning.

Myth 1: CBAM Is Essentially a Tariff and Will Be Struck Down by the WTO

The claim: CBAM functions as a protectionist trade barrier disguised as climate policy and will be invalidated by World Trade Organization dispute resolution.

What the evidence shows: The EU specifically designed CBAM to comply with WTO rules, and legal analyses from multiple independent bodies support this assessment. The mechanism applies equally to domestic and imported goods: EU producers pay the ETS carbon price, while importers pay the equivalent CBAM levy. This "mirror pricing" structure aligns with GATT Article III (national treatment) because it does not discriminate between domestic and foreign producers but rather equalizes carbon costs.

A 2024 analysis by the World Trade Institute at the University of Bern concluded that CBAM has a "strong but not ironclad" case for WTO compatibility, particularly under GATT Article XX(b) and XX(g) exceptions for measures necessary to protect human health and conserve exhaustible natural resources (Bacchus et al., 2024). India and Turkey have both raised concerns at the WTO Committee on Trade and Environment, but neither has filed a formal dispute as of early 2026. Legal scholars at Georgetown University's Institute of International Economic Law note that filing a dispute would force the complainant to argue against the legitimacy of carbon pricing itself, a position that would undermine those countries' own climate commitments under the Paris Agreement (Hillman, 2025).

The practical reality is that CBAM's WTO status will remain legally untested for years. WTO dispute resolution typically takes 3 to 5 years from filing to appellate body ruling, and the appellate body has been non-functional since December 2019 due to US blocking of judicial appointments. Companies planning compliance strategies based on the assumption that CBAM will be legally invalidated are taking on significant risk.

Myth 2: Only EU Importers Need to Worry About CBAM

The claim: CBAM is purely an EU regulation, so non-EU producers and investors can safely ignore it until the mechanism directly affects their operations.

What the evidence shows: CBAM's effects radiate well beyond the EU's borders. The mechanism is already accelerating carbon pricing adoption globally, as trading partners recognize that implementing domestic carbon prices allows their exporters to receive CBAM deductions. The UK launched its own CBAM in January 2027 (announced in December 2024), Australia began formal CBAM consultations in mid-2025, and Canada expanded its existing carbon pricing system partly in response to CBAM dynamics.

For US producers, the indirect effects are substantial. ArcelorMittal, the world's largest steelmaker outside China, announced in 2025 that it would begin requiring Scope 1 and Scope 2 emissions data from all suppliers globally, not just those exporting to the EU, to standardize reporting and identify decarbonization opportunities across its supply chain (ArcelorMittal, 2025). Heidelberg Materials, the world's second-largest cement producer, implemented a similar supplier emissions disclosure program covering 4,200 upstream suppliers in 38 countries. These procurement ripple effects mean that US-based companies supplying into global industrial supply chains face CBAM-driven data requirements regardless of whether they export directly to the EU.

Investors with exposure to US steel, aluminum, and chemical producers should note that CBAM is already influencing capital allocation decisions. Nucor Corporation allocated $250 million in 2025 to expand electric arc furnace capacity specifically to serve lower-carbon steel demand driven partly by CBAM and similar emerging mechanisms (Nucor, 2025).

Myth 3: The Carbon Cost Will Be Negligible Relative to Product Prices

The claim: CBAM certificate costs will represent only a small fraction of total product value and can be easily absorbed by importers.

What the evidence shows: The cost impact varies dramatically by product and production method, and for some categories it is far from negligible. Using EU ETS prices of EUR 70 per tonne of CO2 equivalent:

Product	Typical Embedded Emissions (t CO2e/t product)	CBAM Cost per Tonne of Product (EUR)	Approximate Share of Product Value
Blast furnace steel	1.8 - 2.2	126 - 154	15 - 25%
Electric arc furnace steel (coal grid)	0.4 - 0.8	28 - 56	4 - 9%
Primary aluminum (coal-powered)	12 - 16	840 - 1,120	30 - 45%
Primary aluminum (hydro-powered)	2 - 4	140 - 280	6 - 11%
Portland cement	0.6 - 0.9	42 - 63	25 - 50%
Urea fertilizer	1.5 - 2.5	105 - 175	25 - 40%

For coal-powered aluminum smelters, CBAM costs could represent 30 to 45% of product value, which is transformative rather than marginal. The Boston Consulting Group's 2025 analysis of CBAM trade flow impacts found that approximately $42 billion in annual EU imports from carbon-intensive production routes face cost increases exceeding 10% of product value (BCG, 2025). This creates genuine competitive pressure to decarbonize rather than simply absorb costs.

Myth 4: Companies Can Avoid CBAM by Rerouting Trade Through Non-EU Countries

The claim: Producers can circumvent CBAM by shipping goods to a non-EU country first and then re-exporting to the EU, avoiding the embedded emissions levy.

What the evidence shows: The EU anticipated this circumvention strategy and built anti-circumvention provisions into the CBAM regulation. Article 27 of Regulation (EU) 2023/956 empowers the Commission to extend CBAM to "slightly modified products" and to investigate trade pattern anomalies suggesting resource shuffling. In September 2025, the European Commission launched its first anti-circumvention investigation, examining a 340% increase in Turkish steel re-exports to the EU originating from facilities in Central Asia with no prior EU trading history (European Commission, 2025).

The regulation also addresses "resource shuffling," where a producer with both high-carbon and low-carbon production allocates low-carbon output to EU-bound shipments while routing high-carbon product to other markets. The verification requirements under CBAM's implementing regulations require installation-specific emissions data rather than corporate averages, making this strategy auditable.

Compliance consultancy Ricardo plc reported in 2025 that three multinational aluminum producers had explored trade rerouting strategies and abandoned them after legal review concluded that the anti-circumvention risks, including potential retroactive certificate obligations and penalties of EUR 10 to EUR 50 per tonne of unreported CO2, outweighed the benefits (Ricardo, 2025).

Myth 5: Default Values Make Actual Emissions Measurement Unnecessary

The claim: Companies can rely on the European Commission's default emissions values indefinitely, avoiding the cost and complexity of actual emissions measurement and verification.

What the evidence shows: During the transitional phase (October 2023 through December 2025), importers could use default values derived from average emissions intensity in the country of origin or, failing that, from the worst-performing 10% of EU installations. Beginning in 2026, importers using default values rather than actual verified emissions face substantially higher CBAM costs because default values are deliberately conservative.

Analysis by Carbon Trust in 2025 found that default values exceeded actual emissions by 30 to 80% for steel producers using electric arc furnaces with significant renewable energy shares, and by 15 to 40% for aluminum smelters with hydroelectric power (Carbon Trust, 2025). A US-based EAF steel producer exporting 200,000 tonnes annually to the EU could save EUR 3 to EUR 8 million per year by submitting verified actual emissions rather than accepting defaults. The investment required for emissions measurement, third-party verification, and reporting systems typically runs EUR 100,000 to EUR 500,000 per installation, yielding payback periods measured in months rather than years.

The clear economic incentive means that default values function as a penalty for non-measurement rather than a viable long-term compliance strategy.

What's Working

Verified emissions reporting infrastructure is maturing faster than expected. The European Commission's CBAM registry processed reports from 42,000 authorized declarants during the transitional phase, and third-party verification capacity has scaled significantly. TUV SUD, Bureau Veritas, and SGS collectively added over 800 CBAM-qualified verifiers across 45 countries in 2024 and 2025. Software platforms from Sphera, Persefoni, and SAP now offer integrated CBAM calculation modules that connect emissions data to certificate purchase requirements.

Industry collaboration on measurement methodology is producing tangible results. The World Steel Association's SteelZero initiative established standardized emissions calculation protocols that 85 steel producers accounting for 40% of global production have adopted. This harmonization reduces the cost of CBAM compliance by providing pre-verified methodology that accredited verifiers can assess efficiently.

What's Not Working

Scope 3 upstream emissions remain a measurement gap. CBAM currently covers direct emissions (Scope 1) and emissions from electricity consumption (indirect emissions). Embedded emissions from raw material extraction, transport, and processing upstream of the CBAM-covered installation are excluded. This creates a blind spot: two identical steel products can have vastly different lifecycle emissions based on upstream mining practices, ore transport distances, and raw material processing methods. The European Commission's 2025 review acknowledged this gap and indicated that Scope 3 inclusion will be evaluated for the 2028 CBAM review.

Small and medium enterprises face disproportionate compliance burdens. A 2025 survey by BusinessEurope found that SME importers spent an average of 320 hours and EUR 45,000 on CBAM transitional reporting per quarter, compared to 85 hours and EUR 12,000 for large multinationals with existing sustainability reporting infrastructure. The Commission's simplified reporting tools have reduced this burden modestly, but the fundamental complexity of obtaining installation-level emissions data from overseas producers remains challenging for smaller firms.

Key Players

Established: European Commission DG TAXUD (regulatory authority administering the CBAM registry and verification framework), ArcelorMittal (largest EU steel importer adapting supply chains to CBAM requirements), Heidelberg Materials (cement producer implementing cross-border emissions reporting), TUV SUD (verification body with largest CBAM-qualified auditor network)

Startups: Persefoni (AI-powered carbon accounting platform with integrated CBAM module), CarbonChain (supply chain emissions tracking for commodities including CBAM-covered products), Emitwise (automated Scope 1 and 2 emissions data collection for CBAM reporting)

Investors: Breakthrough Energy Ventures (backing industrial decarbonization technologies that benefit from CBAM-driven demand), Generation Investment Management (portfolio positioning around carbon pricing policy risks), HSBC Asset Management (publishing CBAM exposure analytics for institutional investors)

Action Checklist

• Map all EU-bound exports and imports of CBAM-covered products (cement, iron, steel, aluminum, fertilizers, electricity, hydrogen) across your portfolio
• Quantify the financial exposure by comparing actual installation-level emissions against CBAM default values to identify cost reduction opportunities from verified reporting
• Engage with third-party verification bodies (TUV SUD, Bureau Veritas, SGS) to establish emissions verification for production installations exporting to the EU
• Evaluate supply chain partners for CBAM readiness, particularly upstream raw material suppliers who must provide installation-level emissions data
• Monitor CBAM scope expansion signals, including the 2028 review covering potential addition of organic chemicals, polymers, and downstream manufactured goods
• Assess portfolio companies' decarbonization roadmaps against CBAM cost trajectories to identify stranded asset risk and competitive advantage opportunities

FAQ

Q: When does CBAM start costing real money? A: The transitional phase (reporting only, no financial obligations) ran from October 2023 through December 2025. From January 2026, importers must purchase CBAM certificates at the weekly average EU ETS price. However, free allocation to EU producers is being phased out gradually from 2026 to 2034, meaning CBAM certificate obligations increase proportionally. Full financial impact occurs from 2034 onward when free allocation reaches zero.

Q: How does CBAM interact with the US lack of a federal carbon price? A: US producers exporting to the EU face the full CBAM levy because there is no federal carbon price to deduct. State-level programs like California's cap-and-trade system could theoretically qualify for deductions, but the European Commission has not yet issued guidance on recognizing sub-national carbon pricing schemes. This creates a competitive disadvantage for US exporters relative to producers in Canada, the UK, and other jurisdictions with national carbon prices.

Q: Will CBAM expand beyond its current product scope? A: The European Commission is required to evaluate scope expansion by 2028, with organic chemicals, polymers, and potentially downstream manufactured goods (automobiles, appliances, machinery) under consideration. The Commission's 2025 impact assessment found that extending CBAM to downstream products would increase covered imports from approximately EUR 170 billion to over EUR 600 billion annually, though implementation complexity increases substantially.

Q: Can companies offset CBAM costs with carbon credits? A: No. CBAM certificates must be purchased from the CBAM registry at ETS-linked prices. Voluntary carbon credits, offsets, or removal certificates cannot be used in place of CBAM certificates. The only deduction available is for carbon prices already paid in the country of origin, verified through official documentation from the exporting country's government.

Sources

• European Commission. (2026). Third Annual CBAM Implementation Report: Transitional Phase Results and Compliance Assessment. Brussels: European Commission DG TAXUD.
• European Commission. (2025). CBAM Revenue Projections and Scope Expansion Impact Assessment. Brussels: European Commission DG CLIMA.
• Bacchus, J., Hillman, J., & Lester, S. (2024). WTO Compatibility of the EU Carbon Border Adjustment Mechanism: Legal Analysis and Risk Assessment. Bern: World Trade Institute.
• Hillman, J. (2025). Carbon Border Adjustments and Trade Law: Navigating GATT Exceptions. Georgetown Journal of International Law, 56(2), 312-358.
• Boston Consulting Group. (2025). CBAM Trade Flow Impact Assessment: Cost Exposure by Sector and Production Route. Munich: BCG.
• Carbon Trust. (2025). CBAM Default Values vs. Actual Emissions: Quantifying the Cost Differential Across Industrial Sectors. London: Carbon Trust.
• ArcelorMittal. (2025). Annual Climate Action Report 2024: Supply Chain Emissions Transparency. Luxembourg: ArcelorMittal SA.
• Nucor Corporation. (2025). Sustainability and Capital Allocation: EAF Expansion for Low-Carbon Steel Markets. Charlotte, NC: Nucor Corporation.
• US Census Bureau. (2025). US Exports of Steel, Aluminum, and Fertilizer Products to EU Member States: 2025 Annual Summary. Washington, DC: US Census Bureau.
• Ricardo plc. (2025). CBAM Anti-Circumvention: Legal Risks of Trade Rerouting and Resource Shuffling Strategies. Harwell, UK: Ricardo plc.