Carbon Border Adjustment Mechanism (CBAM): What It Is & How It Works

Since 1 January 2026, imports of steel, cement, aluminium, fertilisers, electricity and hydrogen into the European Union carry a carbon cost. The Carbon Border Adjustment Mechanism has moved from a reporting exercise to a financial one, and much of what was written about it during the transitional period is now out of date.

The rules changed again on the way in. The EU's Omnibus amendment exempted small importers, moved the first certificate sales to February 2027 and reset the declaration calendar. Anyone relying on a 2024 explainer will get the details wrong.

This guide covers the CBAM Europe applies as of July 2026: the regulation, the covered goods, the timeline and what it means for exporters.

What is the carbon border adjustment mechanism (CBAM)?

The Carbon Border Adjustment Mechanism (CBAM full form) is the European Union's carbon price on imported goods. Established by Regulation (EU) 2023/956, it requires EU importers of certain carbon-intensive products to report the emissions embedded in those goods and to surrender CBAM certificates against them, at a price linked to the EU Emissions Trading System.

The CBAM meaning is easiest to see from the EU's side: a tonne of steel made in Europe already pays a carbon price under the EU Emissions Trading System. CBAM applies an equivalent cost to the same tonne when it is imported, so that buying high-carbon imports stops being a way around the carbon price.

Why the EU introduced CBAM

The stated purpose, set out by the European Commission, is to prevent carbon leakage: the relocation of production to countries with weaker climate rules, or the substitution of EU products with higher-carbon imports.

The mechanism is also the counterpart to a change inside the EU. Free allowances that shielded European industry under the Emissions Trading System are being phased out, and CBAM phases in as they disappear. By 2034 the intention is a full carbon price on both domestic production and imports, applied on equal terms. The eu cbam framework is therefore best read as an extension of the ETS rather than a separate trade measure.

Is CBAM a tax?

No. CBAM is a border adjustment, and the distinction is practical rather than academic. A carbon border tax would set a fixed rate in law. CBAM instead requires importers to surrender certificates priced on the weekly average of EU ETS auction prices, so the cost of importing a tonne of embedded carbon rises and falls with the European carbon market.

The design keeps imported and domestic goods on the same footing. When the ETS price is high, both European producers and importers pay more per tonne; when it falls, both pay less. Carbon costs already paid in the country of origin can also be deducted, which matters increasingly as schemes such as India's CCTS mature.

The CBAM regulation

The legal basis is Regulation (EU) 2023/956, adopted in May 2023. It defines the covered goods, the reporting duties, the role of authorised declarants and the certificate system. A set of implementing acts published on 17 December 2025 fixed the operational detail for the definitive regime.

The CBAM regulation was then amended by the Omnibus simplification package, adopted in 2025. The Omnibus made three changes every affected company should know: a 50-tonne annual de minimis exemption, a delayed start to certificate sales (February 2027), and an extended annual declaration deadline. Each is covered in its own section below.

Which goods does CBAM cover?

CBAM currently applies to six categories of goods, defined by customs (CN) codes in Annex I of the regulation: cement, iron and steel, aluminium, fertilisers, electricity and hydrogen. Some downstream products, such as screws and bolts in the iron and steel chain, are included.

Coverage is expected to widen. The European Commission has signalled that additional ETS sectors and further downstream products will be assessed for inclusion before the end of the decade, so a product outside scope today is not necessarily outside scope in 2030.

What steel and aluminium exporters should note

Iron, steel and aluminium account for the bulk of CBAM-relevant trade from India, and both are emissions-intensive to produce. CBAM steel obligations and CBAM aluminium obligations are identical in structure; the difference sits in data complexity across the production route. For these sectors, two numbers now drive competitiveness in the EU market: the embedded emissions per tonne of product, and the quality of the data behind that figure. Where verified actual data is missing, importers fall back on default values, which are deliberately conservative and usually cost more.

CBAM timeline: transitional to definitive

As of July 2026, the timeline stands as follows.

The structure surprises many finance teams: liability accrues through 2026, but the cash outflow for certificates arrives from February 2027. Budgeting for CBAM 2026 exposure therefore happens a year before the payment.

The 50-tonne de minimis exemption

The Omnibus amendment introduced a mass-based exemption. Importers whose net imports of CBAM goods stay below 50 tonnes per year are excluded from the mechanism entirely: no reporting, no authorisation, no certificates. It replaced the earlier 150 euro per-consignment threshold.

The European Commission's stated rationale is proportionality: the exemption removes the large tail of occasional and small importers while keeping the overwhelming majority of embedded emissions in scope. Note that much online guidance still cites the old consignment rule; as of July 2026 the 50-tonne threshold is the operative test.

CBAM certificates and pricing

CBAM certificates are the payment instrument of the definitive regime. One certificate corresponds to one tonne of CO2e embedded in imported goods. The price is set by the weekly average auction price of EU ETS allowances, published by the Commission, so certificate costs track the European carbon market.

Certificates for 2026 imports go on sale in February 2027. Importers then surrender certificates alongside the annual declaration, due by 30 September of the year following import. Deductions apply for carbon prices already paid in the country of origin, subject to evidence.

Who must report, and what data non-EU producers supply

The legal obligation sits with the EU importer, who must hold authorised CBAM declarant status and file one annual declaration covering all CBAM imports of the year. Applications were due by 31 March 2026, with importing allowed to continue while an application is pending.

Non-EU producers have no direct filing duty, but the system does not work without them. The declaration is built on embedded-emissions data measured at the installation that made the goods, and importers must obtain it from their suppliers. In commercial terms this converts emissions measurement into a sales requirement: an exporter that can hand its EU customers verified, installation-level data is easier to buy from than one that cannot.

What CBAM means for exporters to the EU

For exporters in covered sectors, CBAM changes the basis of competition in the European market. Price and quality now sit alongside embedded carbon, because the buyer pays for that carbon at the border. Producers with lower emissions per tonne, and credible data to prove it, gain a structural advantage; producers relying on default values inherit a cost penalty.

India's exposure is concentrated in iron, steel and aluminium. We cover the sector-level numbers, the Government of India's response and the strategic options in our dedicated guide to how the EU CBAM impacts India, and in our CBAM handbook for Indian exporters.

How Oren can help

Every CBAM conversation with an EU customer eventually reaches the same request: installation-level embedded emissions, calculated to EU methodology, with evidence behind every number. Oren's GHG accounting platform builds that data foundation, and our CBAM compliance service prepares exporters for the definitive regime, from emissions calculation to the reports your customers' declarants file. If EU buyers are already asking for your numbers, schedule a demo.

Key takeaways

CBAM is the EU's carbon price at the border, established by Regulation (EU) 2023/956 and live in its definitive form since 1 January 2026. It covers cement, iron and steel, aluminium, fertilisers, electricity and hydrogen.

The Omnibus amendment rewrote the operational details: importers below 50 tonnes a year are exempt, certificate sales start in February 2027, and the first annual declaration is due by 30 September 2027.

Certificate prices track weekly EU ETS auction averages, so exposure moves with the European carbon market and accrues a full year before the first payment.

For non-EU producers the mechanism is commercial rather than legal: verified embedded-emissions data is becoming a condition of selling into Europe, and the exporters who invest in it first will keep their customers longest.