1. What Is CBAM or the Carbon Border Adjustment Mechanism?
If you’re asking what is the Carbon Border Adjustment Mechanism, here’s the short answer: it’s a carbon charge applied at the EU border, calculated not on the value of your goods but on how much CO2 was emitted to produce them.
Known as CBAM, it’s the EU’s solution to a problem it’s been wrestling with for years, how do you stop carbon-intensive production from simply relocating to countries with looser environmental rules? The definitive regime launched on 1 January 2026, which means certificate obligations and quarterly reporting are already active. Many exporters shipping steel, aluminium, or fertilisers into the EU may not yet have fully priced in what that means for their business.
Getting this wrong has a cost, and it compounds quickly. This isn’t a traditional tariff. The compliance requirements are more technical than a standard customs declaration, covering product-specific emissions calculations, third-party verification, and certificate surrender, and the margin for error is narrow.
2. Why has the EU created the Carbon Border Adjustment Mechanism?
EU manufacturers pay for their carbon emissions through the EU Emissions Trading System (EU ETS). That cost is the point: it makes cleaner production financially rational inside the bloc. But if imported goods arrive from countries where no equivalent carbon price exists, EU producers face a structural disadvantage. They pay to clean up their operations; their foreign competitors don’t.
That gap is called carbon leakage, and it’s the specific problem CBAM was designed to close. The mechanism works by applying a carbon cost to imports of certain goods that mirrors what EU producers already pay domestically. It levels the playing field rather than penalising imports outright. CBAM differs from a traditional carbon border tax in one important respect: it’s not a fixed charge. Its certificate price is directly tied to the EU ETS allowance price, which currently sits around €79 per tonne of CO2. As the EU phases out free ETS allowances for sectors covered by CBAM, the two systems work in tandem: one prices emissions inside the EU, the other prices the embedded emissions in goods coming in from outside it.
This border carbon adjustment mechanism is designed to be dynamic, not static.
3. Which imported goods does CBAM cover?
CBAM covers six core product categories: cement, iron and steel, aluminium, fertilisers, electricity, and hydrogen.
It also extends to selected precursor goods and certain downstream products tied to those sectors. Coverage is defined by specific CN codes, not entire industries. Not every steel product triggers a CBAM obligation, which is exactly why understanding the precise codes that apply to your goods is the first practical compliance step, not an afterthought.
For a sector-by-sector breakdown of the specific CN codes and products covered, see this guide on goods covered under CBAM. Goods outside these six categories don’t face CBAM today. Organic chemicals and polymers were discussed for inclusion but are not part of the current scope. Future expansion is possible as EU climate policy evolves, but no confirmed timeline exists for additional categories. If you export goods in any of the six covered sectors into the EU, the obligation applies to you now. If you’re in an adjacent industry, keep watching the regulatory pipeline, scope changes are a real possibility.
4. How does embedded carbon emissions calculation actually work?
Embedded emissions are the CO2 produced during the manufacturing process of a CBAM-covered good. For simple goods, the calculation is production emissions divided by output volume. For complex goods, such as certain steel products, it also includes the embedded emissions from any precursors used in manufacturing. The EU’s methodology is product-specific.
There is no universal emissions factor that applies across all goods, which is precisely where companies who attempt this internally without the right expertise run into trouble. For practical guidance on employing Life Cycle Assessment (LCA) methods, see resources about measuring embedded emissions accurately.
CBAM declarants buy certificates from the national authority, and the price per certificate is set at the quarterly average EU ETS auction price, a mechanism documented in the CBAM implementing regulation.
From 2027 onward, that shifts to a weekly average. The formula is straightforward: gross CBAM exposure equals embedded emissions multiplied by the applicable certificate price. At current ETS prices of around €79 per tonne, that number adds up quickly for carbon-intensive products shipped at scale. The net obligation is gross exposure minus any eligible foreign carbon cost already paid in the country of origin.
5. A note on default values
Default values exist for situations where verified production data isn’t available, but they are a fallback, not a strategy. During the transitional period (Q3 2024 through end-2025), estimated values could cover at most 20% of total embedded emissions for complex goods.
The definitive phase, active since January 2026, sets new default values by country of origin and product type under the 2025 implementing regulation. The Commission’s published default values for CBAM give more detail on those fallbacks. Relying on defaults rather than verified actual data exposes you to inaccuracy risk and raises questions under EU scrutiny.
6. Are CBAM deadlines and reporting obligations already in force?
CBAM ran as a transitional phase from October 2023 through December 2025.
During that period, importers reported embedded emissions quarterly but didn’t yet purchase certificates. That changed on 1 January 2026, when the definitive regime became active. Importers must now be registered as authorised CBAM declarants, continue quarterly emissions reporting, and purchase and surrender the correct number of certificates matching their actual imports. Non-EU companies cannot act directly in EU CBAM systems.
If you’re a US exporter and your goods are entering the EU, you must appoint an indirect customs representative established in an EU member state. That representative takes on the reporting and financial liabilities on your behalf. The appointment is made under Article 18 of the Union Customs Code, and the representative applies for CBAM declarant authorisation from the competent authority in their member state.
The key deadlines you need on your radar right now:
– 1 January 2026: Definitive CBAM regime active. Certificate purchases required.
– 31 March 2026: Deadline to apply for authorised CBAM declarant status under simplified transition arrangements.
– 30 September 2027: First annual CBAM declaration and certificate surrender for 2026 imports due.
Quarterly reports remain due within one month after each quarter ends. Missing those deadlines carries financial penalties of €10 to €50 per tonne of unreported emissions, enforced at the national level under the CBAM regulation.
In cases of serious or repeated non-compliance, some member states have additional enforcement powers including import restrictions and public naming of violators. See the latest info here.
7. Why CBAM Will Impact UK, Northern Irish and Irish Importers More Than Expected
For businesses importing goods into the EU, Northern Ireland, or supplying products into EU supply chains, CBAM is no longer a future regulation, it is a live financial reality. Importers of steel, aluminium, cement, fertilisers, hydrogen and electricity now face increasing compliance obligations and potentially significant carbon-related costs linked to the emissions generated during production.
The biggest challenge for many UK and Irish businesses is not the carbon cost itself, it’s data readiness. Most importers have never previously needed to collect verified emissions data from overseas suppliers. Under CBAM, businesses must be able to accurately report embedded carbon emissions at a product level and maintain evidence to support those declarations. Companies relying on spreadsheets, manual supplier questionnaires and disconnected records often underestimate the time, expertise and governance required to remain compliant.
The financial impact can be substantial. With the first official CBAM certificate price published at €75.36 per tonne of CO₂e, inaccurate reporting, poor supplier engagement or unsupported emissions data can quickly translate into increased costs, compliance risks and potential penalties. For importers operating high-volume supply chains, these costs can become significant over time, particularly as CBAM requirements continue to expand and mature.
8. Getting CBAM Compliance Right
CBAM compliance requires far more than simply submitting a report. Businesses must understand which commodity codes fall within scope, gather emissions data from suppliers, assess potential carbon costs, maintain audit-ready records and prepare for annual declarations and certificate obligations.
Allied Group’s specialist CBAM team supports businesses through every stage of the process. From identifying affected commodity codes and calculating embedded emissions to supplier engagement, reporting support and compliance strategy, our experts help businesses reduce risk and prepare for the future with confidence. As one of the few certified CBAM training providers in the UK and Ireland, Allied Group has been supporting businesses since CBAM was first introduced in 2023. For more info, click here.
9. What Should Businesses Do Now?
The businesses that act early will have the greatest advantage. CBAM is rapidly becoming a core part of international trade compliance, and future developments are expected to increase both reporting requirements and the range of affected products.
For UK, Northern Irish and Irish importers, the priority should be understanding your exposure today. Identifying affected commodity codes, engaging suppliers, reviewing emissions data and assessing potential carbon liabilities now can help avoid costly surprises later. Businesses that treat CBAM as a simple reporting exercise risk falling behind, while those that invest in preparation, governance and compliance will be best positioned to protect margins, maintain market access and remain competitive in an increasingly carbon-conscious trading environment.
If you have any questions or need support with CBAM, we would be delighted to support your business with a free no-obligation CBAM Review.
Email info@allied-group.co.uk to get a free CBAM Review for your business.
