EU Carbon Border Tax (CBAM): Complete Guide for Importers

Since 1 October 2023, the European Union has been rolling out the world’s first carbon border adjustment mechanism, more widely known as the carbon border tax, or CBAM (Carbon Border Adjustment Mechanism). From 1 January 2026, it is fully operational: importers of covered goods must now purchase certificates, report emissions, and meet strict annual deadlines.

This guide explains what the carbon border tax is, which products and sectors it covers, how the mechanism works in practice, and what importers need to do to stay compliant.

Origin and Regulatory Framework

The CBAM was officially agreed by the European Council in March 2022, as part of the EU’s “Fit for 55” package, the legislative framework designed to cut EU greenhouse gas emissions by 55% by 2030, in pursuit of climate neutrality by 2050 under the European Green Deal.

The mechanism was reinforced in December 2022 with the expansion of covered sectors and an accelerated deployment timeline. It entered its transitional phase on 1 October 2023 and became fully operational on 1 January 2026.

The legal basis is Regulation (EU) 2023/956, with detailed implementation rules published by the European Commission in late December 2025.

Which Products Does the Carbon Border Tax Cover?

CBAM currently applies to 303 products in six carbon-intensive sectors, identified in Annex I of Regulation 2023/956, trackable by specific customs nomenclature codes:

• Steel and iron (excluding certain ferro-alloys)
• Aluminium
• Cement
• Nitrogen-based fertilisers
• Electricity
• Hydrogen

These sectors together account for approximately 3% of EU imports, but they are the most exposed to the risk of carbon leakage.

At this stage, only direct emissions (Scope 1) linked to the manufacturing of covered goods are included in the mechanism. The European Commission has indicated its intention to extend CBAM to additional industrial sectors and downstream products over time to prevent circumvention through downstream processing.

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Why Was the Carbon Border Tax Introduced?

The core problem CBAM solves is the asymmetry between EU carbon standards and those of the rest of the world. EU manufacturers must comply with strict and costly climate obligations. Competitors in countries with lax or no carbon pricing can produce the same goods more cheaply and undercut European businesses on price.

Without CBAM, this creates a perverse incentive: EU companies lose market share, production migrates to high-emission regions, and global CO₂ levels don’t fall. CBAM breaks this dynamic by:

• Protecting EU industrial competitiveness against producers that don’t bear equivalent carbon costs;
• Preventing carbon leakage : emissions shifting abroad rather than actually being reduced;
• Encouraging third countries to adopt their own carbon pricing policies, since paying at the EU border is equivalent to paying a carbon tax at home, except the revenue goes to Brussels rather than the exporting country.

The OECD’s modelling shows that with CBAM, global emissions fall by 0.54% compared to 0.39% without it; confirming its effectiveness in actually reducing global greenhouse gases rather than merely relocating them.

How the Carbon Border Tax Works?

The Certificate System

Importers of covered goods must purchase CBAM certificates, each equivalent to one tonne of CO₂ equivalent embedded in the product. The price of CBAM certificates is indexed to the EU ETS carbon market, updated weekly based on supply and demand. As of 2025, EU carbon prices have fluctuated between €50 and €75 per tonne.

Importers who can demonstrate that a carbon price has already been paid in the country of origin (through a domestic carbon tax or ETS) can deduct that amount from their CBAM certificate obligation.

Default Emissions Values and the Markup Structure

For importers who did not establish actual emissions tracking during the 2023–2025 transition period, the EU has published default emissions values by country of origin and product type, based on estimated average direct and indirect CO₂ emissions per metric tonne of goods produced.

CBAM Timeline: Key Dates

Phase 1 – Transitional period: 1 October 2023 to 31 December 2025

During this period, importers were not required to pay for emissions but had to file quarterly reports declaring:

• The quantity of each type of covered goods imported;
• Direct emissions generated during production;
• Indirect emissions (notably from electricity consumption);
• Any carbon price already paid in the country of origin.

Importers also registered on the CBAM Transitional Registry to prepare for full implementation.

Phase 2 – From 1 January 2025: authorised CBAM declarant status

Companies wishing to continue importing covered goods must apply for and obtain authorised CBAM declarant status. This became a prerequisite for any import from 2026.

Phase 3 – From 1 January 2026: full operation

Importers must:

• Hold authorised CBAM declarant status;
• Purchase CBAM certificates matching the CO₂ emissions of imported products;
• Hold a minimum of 50% certificate coverage at the end of each quarter;
• File an annual CBAM declaration by 30 September each year (first declaration, covering 2026 imports, due 30 September 2027).

This is also when the progressive phase-out of free ETS allowances to EU industrial sectors began, with CBAM gradually replacing the free allocation as the main carbon cost-equalisation tool.

Phase 4 – By 2034: full phase-out

Free ETS allowances will be fully eliminated, and CBAM will operate as the sole border carbon adjustment mechanism for all covered sectors.

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Who Is Most Affected?

CBAM’s impact varies significantly by country and product. The most affected exporters to the EU are large-scale suppliers of industrial raw materials with carbon-intensive production:

• China : the world’s leading supplier of many industrial materials, including steel produced largely in blast furnaces with high carbon intensity;
• Russia : a major exporter of aluminium and fertilisers to the EU;
• Ukraine : a key player in steel and fertilisers.

Smaller economies with high export dependency on CBAM-covered goods face potentially severe economic consequences:

• Mozambique : approximately 20% of its total EU exports consist of aluminium;
• Zimbabwe : exposed through industrial exports;
• Bosnia-Herzegovina and Serbia : large exporters of iron, steel, and cement to the EU.

Conversely, economies with cleaner production profiles, such as Chile, Mexico, and Türkiye, stand to gain modestly as EU importers shift sourcing toward lower-emission suppliers.

The Broader Geopolitical Picture

The EU’s carbon border tax has not gone uncontested. China has argued that it violates the core principle of the Paris Agreement, that developed nations should bear greater responsibility for cutting emissions and that it risks acting as a form of trade protectionism.

The debate around fairness is real: CBAM does impose equivalent climate standards on developing economies that have historically contributed less to cumulative global emissions. At the same time, allowing higher-emission imports to freely undercut EU producers would reward lower environmental standards, making the EU’s own climate investments commercially self-defeating.

What is clear is that CBAM is setting a global precedent. The UK, Canada, and Australia are all actively exploring similar border carbon adjustment mechanisms. The EU’s experience will shape how these policies are designed worldwide.

FAQ : Carbon Border Tax (CBAM)

CBAM and Fiscalead: How We Can Help

CBAM is technically demanding: it requires emissions monitoring at the production facility level, complex reporting under EU formats, quarterly certificate holdings, and an annual declaration. Getting it wrong, whether through inaccurate default values, missed deadlines, or incorrect product classification, carries significant financial penalties.