EU CBAM: The Carbon Border Tax Is Now Live — What UK Manufacturers Need to Do

The EU’s Carbon Border Adjustment Mechanism (CBAM) entered its definitive phase on 1 January 2026. For UK manufacturers exporting steel, aluminium, cement, fertilisers, hydrogen or electricity to Europe, the cost implications are real and the clock is ticking.

This isn’t a distant regulatory risk. The first CBAM certificate price has been set at €75.36 per tonne of CO₂e for Q1 2026. If you’re exporting CBAM-scope goods to EU customers right now, you are already accumulating cost exposure even though payment doesn’t fall due until February 2027.

Here’s what you need to understand and act on.

What CBAM Actually Is (And Isn’t)

CBAM is not a tariff or a tax on UK exports. It’s a carbon pricing mechanism that sits on the EU importer, not the UK exporter. When an EU business buys in-scope goods from outside the EU, they must purchase CBAM certificates to cover the embedded carbon emissions in those products.

The certificate price tracks the EU Emissions Trading Scheme (ETS). For 2026, it’s set quarterly at €75.36 for Q1. From 2027, it moves to a weekly average.

The obligation is your EU customer’s problem in a legal sense. In a commercial sense, it becomes your problem very quickly.

The Direct Impact on UK Exporters

Your EU customers will pass the cost back.

If your product carries 2 tCO₂e per tonne of embedded emissions above the EU benchmark, your customer faces roughly €150 per tonne in CBAM costs on top of what they pay you. They’ll either renegotiate your price, absorb the hit (unlikely), or look for a lower-carbon alternative supplier.

You’ll be expected to provide granular emissions data.

EU importers must declare embedded emissions product-by-product. They need that data from you. If you can’t provide verified, methodology-aligned emissions figures, you create compliance risk for your customer. That’s a commercial risk for you delayed customs clearances, blocked shipments, and damaged relationships.

The UK ETS creates a partial offset, but not a full one.

If you’re already paying under the UK ETS, those carbon costs can be deducted from your customer’s CBAM liability. But the UK ETS and EU ETS prices don’t move in lockstep, and allocation rules differ. There will be a gap in most cases.

The scale of exposure for UK industry is significant. Research from the LSE Grantham Institute estimates around one-third of the total value of UK goods exports to the EU could eventually fall under CBAM’s scope, with UK steel (around £4.8bn in 2021) and aluminium (around £1.2bn) most immediately affected.

What Scope 3 Has to Do With It

CBAM compliance sits at the intersection of two things that are becoming non-negotiable for UK manufacturers: carbon accounting and supply chain transparency.

The emissions data your EU customers now need from you product-level embedded carbon, calculated to EU CBAM methodology standards is essentially a Scope 3 calculation from their perspective. If you’re producing that data already under GHG Protocol Scope 1 and 2 reporting, you’re partway there. If you’re not, this is the business case to start.

More broadly, CBAM is an early signal of where trade and procurement are heading. EU buyers under the Corporate Sustainability Reporting Directive (CSRD) need supply chain emissions data for their own disclosures. UK buyers operating under the Streamlined Energy and Carbon Reporting (SECR) framework, or pursuing net-zero targets with science-based validation, are asking the same questions of their suppliers.

The manufacturers who build robust carbon data systems now will be better positioned in procurement tenders, better protected against losing EU contracts, and better prepared when the UK introduces its own carbon border mechanism something the government has signalled it’s considering.

Four Things to Do Now

1. Map your CBAM exposure. Identify which products you export to the EU, whether they fall within CBAM scope (steel, iron, aluminium, cement, fertilisers, hydrogen, electricity and certain downstream products), and your approximate export volumes. This tells you the financial scale of what you’re dealing with.

2. Build a product-level emissions baseline. Develop embedded carbon calculations aligned to EU CBAM methodology. This requires understanding your Scope 1 and 2 emissions and how they allocate to individual product lines. If you don’t have this, a net-zero program that includes product carbon footprinting is the place to start.

3. Talk to your EU customers before they come to you. Find out who their authorised CBAM declarant is, what data format they need, and what timeline they’re working to. Getting ahead of this positions you as a reliable partner rather than a compliance problem to manage.

4. Run cost scenarios at €75/tCO₂e. Use the current certificate price to model forward CBAM cost exposure under different emission and volume scenarios. This tells you whether process improvements, energy switching, or procurement changes have a credible financial payback and gives your Finance Director a clear basis for capital allocation decisions.

The Bottom Line

CBAM is not a future problem. For any UK manufacturer exporting in-scope goods to EU customers, it’s a present-day cost that will hit cash flow in 2027 based on goods already moving now.

The practical response isn’t complicated, but it does require building carbon data capability that most UK SMEs don’t yet have. The manufacturers who treat that as an infrastructure investment rather than a compliance cost will be better placed commercially for the next decade of trade with Europe.

SBS works with UK manufacturers and industrial businesses to build the carbon accounting and compliance programmes that underpin both regulatory readiness and commercial competitiveness. If you want to understand your CBAM exposure and what it means for your supply chain strategy, get in touch with our team.

Sources: European Commission taxation-customs.ec.europa.eu; LSE Grantham Institute; Carbon Pulse; Ashurst; ICAEW; UK Government business.gov.uk