Illustrative calculation: if Northshire Engineering imports 100 tonnes of steel with an embedded emissions factor of 1.8 tonnes of carbon dioxide equivalent per tonne, its shipment represents 180 tonnes of emissions; at an assumed UK carbon price of £50 per tonne and an overseas carbon price of £15, the potential CBAM charge is 180 × (£50 − £15) = £6,300, before any applicable deductions.
That is the practical answer to the question, CBAM UK importers what it means. The UK Carbon Border Adjustment Mechanism is planned to begin on 1 January 2027. It will place a carbon-related cost on some goods imported into the UK, so businesses cannot treat this as an EU-only issue or leave it until their customs broker asks for information.
The calculation above is illustrative, not a forecast. The final rate, reporting rules and treatment of overseas carbon prices will depend on the UK scheme’s detailed regulations. The sensible response is to identify your exposure, improve supplier data and model the likely cost.
“We import components, not raw materials. Surely CBAM does not apply?”
Possibly. The UK scheme is expected to cover specified imports in carbon-intensive sectors, including iron and steel, aluminium, cement, fertiliser, hydrogen, glass and ceramics. The exact product coverage will depend on commodity codes and the final legislation, not the description used by your sales team or supplier.
That distinction matters. A fabricated steel assembly, aluminium profile or ceramic component may fall within scope even though it is a finished product. A product made outside the UK may also contain several materials, each with different emissions data and customs classifications.
Start with your import records. Pull the commodity code, country of origin, supplier, weight, customs value and arrival date for each potentially affected product. Ask your customs adviser to confirm whether the code appears in the proposed CBAM scope.
The contrarian point is simple: do not assume every shipment in a listed sector creates a charge. Scope decisions depend on the final rules, product code and relevant threshold. But do not use that uncertainty as an excuse to do nothing.
“Is this just another version of the EU CBAM?”
No. The UK and EU schemes address a similar problem, but they are separate systems. The EU CBAM entered its transitional phase in October 2023 and moves towards certificate purchasing and financial obligations from 2026. The UK has proposed its own mechanism from 2027.
A UK importer buying from an EU supplier may face an awkward data gap. The supplier might already understand EU CBAM reporting, but that does not guarantee it can provide information in the format the UK system requires. Conversely, a UK business exporting goods to the EU may have obligations under the EU scheme even when its UK imports are outside the UK mechanism.
For group businesses, map each legal entity and each border crossing. Do not assume that one group-wide spreadsheet will satisfy every jurisdiction. The EU’s official CSRD overview is also worth checking if your European subsidiary has wider reporting duties.
The objection I hear is usually, “Our supplier handles the EU paperwork, so we are covered.” That is too optimistic. Customs responsibility, emissions evidence and financial liability can sit with different companies.
“How will the UK CBAM charge be calculated?”
The proposed design links the charge to the embedded emissions in imported goods and the difference between the UK carbon price and a valid carbon price paid in the country of production. In broad terms:
Potential CBAM liability = embedded emissions × UK carbon price gap
Embedded emissions may be based on actual verified data from the installation that produced the goods, or on default values where reliable data is unavailable. The rules are expected to distinguish direct emissions from certain indirect emissions, depending on the sector and final methodology.
Worked illustrative example
Assume Northshire Engineering imports 100 tonnes of steel from a Turkish mill. The mill supplies verified production data showing 1.8 tonnes of carbon dioxide equivalent per tonne. Embedded emissions are therefore 180 tonnes. If the relevant UK carbon price is £50 per tonne and an accepted overseas carbon price is £15 per tonne, the gap is £35 and the indicative liability is £6,300.
If the supplier cannot provide accepted data and a default factor of 2.2 tonnes per tonne is used, emissions rise to 220 tonnes. On the same assumptions, the indicative liability becomes £7,700. Poor data has increased the estimate by £1,400.
| Input | Illustrative assumption | Result |
|---|---|---|
| Imported steel | 100 tonnes | Shipment quantity |
| Actual emissions factor | 1.8 tonnes CO2e per tonne | 180 tonnes CO2e |
| Default emissions factor | 2.2 tonnes CO2e per tonne | 220 tonnes CO2e |
| UK and overseas price gap | £50 − £15 | £35 per tonne CO2e |
| Indicative charge using actual data | 180 × £35 | £6,300 |
| Indicative charge using default data | 220 × £35 | £7,700 |
These are disclosed assumptions, not official UK CBAM rates. They show why emissions data can affect procurement decisions. They also show why simply multiplying spend by a generic carbon factor will not be enough for a defensible return.
Some businesses will object that the price is impossible to model before the legislation is final. Fair enough. Model a low, central and high case instead. A range is more useful to a finance director than a false single-point forecast.
“What records will UK importers need?”
CBAM UK importers need to treat this as a data-control exercise, not only a tax exercise. Build a product-level register covering:
- commodity codes and product descriptions;
- supplier and production-site details;
- country of origin and customs entry information;
- imported mass and shipment dates;
- production emissions, including the calculation method;
- evidence of any carbon price paid overseas;
- contracts showing who bears the cost and who supplies the data; and
- versions, approvals and checks for every submitted figure.
Supplier data should be specific to the installation where possible. A supplier’s corporate emissions intensity may be useful for screening, but it may not prove the emissions embedded in the goods you bought.
This is where the same discipline used for Scope 3 accounting helps. The GHG Protocol Corporate Standard gives a useful framework for emissions boundaries and documentation, although it is not a substitute for the final CBAM rules. You can also adapt the questions in this supplier engagement letter for Scope 3 data when asking overseas manufacturers for site-specific information.
The caveat is that more data is not always better data. If a supplier sends an unexplained figure with six decimal places, do not mistake precision for evidence. Record the source, method and reviewer.
“Can we pass the cost to customers?”
Contract terms will decide more than carbon policy. If you buy imported steel under a fixed-price agreement, a new carbon cost may sit with your business. If your terms include duties, taxes or regulatory charges, there may be a route to recovery, but that needs legal and commercial review.
Procurement teams should add carbon data to supplier comparisons. A lower invoice price can become more expensive if the supplier only offers default emissions values. Ask suppliers three questions now: where was the product made, how were its emissions calculated and what evidence can be provided if the figure is audited?
For manufacturers, the answer may be redesign or substitution. For distributors, it may be changing supplier or consolidating shipments. For finance teams, it may be creating a provision based on a scenario range rather than waiting for the first annual return.
A common pushback is, “Our customers will not pay more for a greener product.” They may not. The business case may instead be fewer data disputes, better access to European customers and less exposure to a supplier whose emissions cannot be evidenced.
“What should we do before 2027?”
Take four practical steps.
- Screen your imports. Review the previous 12 months of customs data and flag goods in the proposed sectors.
- Confirm scope. Match products to commodity codes and monitor UK government publications as the rules develop.
- Test the numbers. Calculate emissions using actual supplier data, plausible defaults and three carbon-price scenarios.
- Fix ownership. Give named responsibility to procurement, finance, customs and sustainability rather than leaving the task with one overstretched manager.
Do not confuse CBAM with the UK Emissions Trading Scheme. The UK ETS guidance concerns covered domestic installations and emissions trading obligations; CBAM concerns the carbon content of specified imported goods. A business may be affected by one, both or neither.
If your wider emissions inventory is already uncertain, a carbon audit can expose the gaps before they become a customs problem. Speak with Audit My Carbon about an import and emissions data review.
The final contrarian point is worth keeping: you may not need a sophisticated CBAM platform. A controlled spreadsheet can work for a small import portfolio, provided the source documents, calculations and approvals are clear. Systems become worthwhile when product lines, suppliers and jurisdictions make manual checking unreliable.
Frequently asked questions
When does the UK CBAM start?
The UK government has proposed that the Carbon Border Adjustment Mechanism begins on 1 January 2027. Businesses should confirm the final start date, scope and reporting process when the legislation and detailed guidance are published. Early preparation still makes sense because supplier emissions records can take months to obtain and check.
Which goods are expected to be covered?
Proposed sectors include iron and steel, aluminium, cement, fertiliser, hydrogen, glass and ceramics. Coverage will depend on specific commodity codes and the final legislation. Do not decide scope from a product name alone. Check the customs classification, country of origin and any published UK government schedule.
Will small UK importers be exempt?
The UK has proposed a threshold based on the value of relevant imports over a rolling 12-month period, with a consultation figure of £50 million discussed for registration and liability. The final threshold and calculation method must be confirmed in legislation. Small businesses should still screen imports because group structures and rapid growth can change the position.
Do suppliers have to provide embedded emissions data?
Overseas suppliers may not be the legally responsible party under the UK scheme, but their information can determine the importer’s calculation. Without credible site-level data, default values may apply and produce a higher liability. Put data requirements into purchase orders and contracts, then test whether suppliers can actually meet them.
For many UK importers, the first CBAM decision is not whether to buy certificates. It is whether the business knows exactly what it imports, where it was made and how much carbon sits inside it.
Arrange a practical CBAM readiness discussion if you want an independent view of your exposure before the rules take effect.
Frequently asked questions
When does the UK CBAM start?
The UK government has proposed that the Carbon Border Adjustment Mechanism begins on 1 January 2027. Businesses should confirm the final start date, scope and reporting process when the legislation and detailed guidance are published. Early preparation still makes sense because supplier emissions records can take months to obtain and check.
Which goods are expected to be covered?
Proposed sectors include iron and steel, aluminium, cement, fertiliser, hydrogen, glass and ceramics. Coverage will depend on specific commodity codes and the final legislation. Do not decide scope from a product name alone. Check the customs classification, country of origin and any published UK government schedule.
Will small UK importers be exempt?
The UK has proposed a threshold based on the value of relevant imports over a rolling 12-month period, with a consultation figure of £50 million discussed for registration and liability. The final threshold and calculation method must be confirmed in legislation. Small businesses should still screen imports because group structures and rapid growth can change the position.
Do suppliers have to provide embedded emissions data?
Overseas suppliers may not be the legally responsible party under the UK scheme, but their information can determine the importer’s calculation. Without credible site-level data, default values may apply and produce a higher liability. Put data requirements into purchase orders and contracts, then test whether suppliers can actually meet them.
