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The UK CBAM starts on 1 January 2027 across the UK, including Northern Ireland. Its initial scope is limited to specified commodity codes in aluminium, cement, fertiliser, hydrogen, and iron and steel. Glass and ceramics are not in the initial 2027 scope.
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What makes a construction import fall within UK CBAM?
Coverage is determined by the commodity code
HMRC’s instruction is to check imported goods by their customs commodity codes. The code reflects the product’s material, composition, form, processing and other characteristics used for tariff classification. Two products sold under the same commercial name can have different codes, while a product used on a building project may fall outside CBAM if its code is not on the relevant list.
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Start with the code used on the UK customs declaration, not a supplier’s marketing description or an internal purchasing category. If the code is wrong, every later decision—scope, importer responsibility, value totals and records—can also be wrong.
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The scheme has a defined initial scope
From 1 January 2027, UK CBAM covers only specified goods in five sectors:
| Sector | How to assess a construction-related import |
|---|---|
| Aluminium | Check the product’s complete commodity code against HMRC’s aluminium list. |
| Cement | Check the exact cement commodity code and any code-specific exclusion. |
| Fertiliser | Check the code even if the product is being imported for a construction, landscaping or infrastructure project. |
| Hydrogen | Use the hydrogen list and the code shown for the imported form of the product. |
| Iron and steel | Check the exact code; not every iron- or steel-containing product is automatically included. |
HMRC publishes a separate list for each sector. The lists are code-based rather than a blanket list of everything used on a construction site.
When the UK rules start
The operative start date is 1 January 2027. The policy applies throughout the UK, including Northern Ireland. Earlier proposals included glass and ceramics, but HMRC’s policy summary says they are not in the initial January 2027 scheme. Do not treat a glass or ceramic product as covered merely because it was mentioned in an earlier proposal or in an outdated article.
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1. Describe the goods precisely
Collect the facts needed to classify the product before looking at CBAM. Record its base material, chemical or alloy composition, physical form, dimensions, manufacturing process, degree of processing, intended use and packaging where those details affect classification.
For example, “steel for a building” is not a sufficient description. You may need to distinguish a finished structural item from a semi-finished product, a fabricated assembly, a coating or a scrap load. Likewise, “aluminium” could describe primary metal, a specific product form, a fabricated article or scrap. The commercial name alone does not establish the code.
2. Identify the code used for the UK import
Use the commodity code on the UK customs declaration and retain the declaration and the product information supporting it. If the code was supplied by a broker or another representative, ask how it was determined and check that it matches the goods actually shipped.
Where the classification is uncertain, pause the CBAM decision rather than selecting a code because it appears close to the product description. A classification decision made for one form, grade or processing stage may not apply to another.
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3. Match the code to HMRC’s current sector list
Open the HMRC CBAM list for the relevant sector—aluminium, cement, fertiliser, hydrogen, or iron and steel—and search for the complete code. Check all digits required by the list. A match must be to the code for the imported goods, not merely to a broader heading or to a similar product.
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HMRC describes this task as “checking their commodity codes.” Keep a copy or dated record of the list version you used, together with the code and product description, so another person can reproduce the decision.
4. Check exclusions and the list’s date
A sector match does not end the analysis. HMRC’s policy summary identifies code-specific exclusions, including imported aluminium scrap and iron-and-steel scrap. Confirm whether the precise code is excluded before treating the shipment as in scope.
Use the current list. HMRC says codes can be updated alongside changes to the UK Tariff to preserve the intended product scope. An old code, a remembered classification or a saved spreadsheet can become unreliable after a tariff change. Put a review date on internal code lists and revisit them when HMRC publishes an update.
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5. Identify the importer for that declaration
Scope and legal responsibility are separate questions. Once a code is listed, determine who HMRC treats as the importer for the particular declaration.
Where customs duties are payable, HMRC generally treats the person named on the customs declaration as the importer. Where no customs duties are payable, HMRC identifies the person importing the goods. Read the declaration and the contractual arrangements together; do not assume that the party paying a supplier, arranging transport or owning the goods is automatically the importer.
An agent, employee, customs broker, freight forwarder, haulier or parcel operator may submit documents or handle logistics on the importer’s behalf. Handling the process does not, by itself, make that representative the importer.
6. Apply the registration-threshold test
HMRC’s registration checklist states that registration is required when the total value of qualifying CBAM goods imported goes over, or is expected to go over, £50,000 under the applicable rules.
From 1 January 2027, assess the relevant rolling 12-month period rather than treating £50,000 as a simple calendar-year allowance. Expected future imports can also trigger liability, so a business should not wait until a shipment has physically arrived if its planned imports are expected to exceed the threshold.
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The £50,000 figure is only the headline threshold. HMRC’s detailed rules include timing provisions and exclusions from the threshold calculation. Check which transactions are excluded and how the start-date calculation applies to your circumstances before concluding that registration is or is not required.
Registration opens by 1 January 2028. Businesses that become liable before registration opens should preserve the information needed for later registration and reporting.
7. Keep evidence even if you do not have to register
HMRC says records are required even where an importer concludes that registration is not necessary. Your file should allow you to demonstrate both why the goods are, or are not, in scope and how you assessed the threshold.
8. Escalate unresolved classifications
If the code is disputed, technically complex or inconsistent with the supplier’s information, obtain specialist customs advice or an authoritative classification decision. Do not claim that a material is covered—or exempt—on the basis of a broad commercial label.
Which commodity codes are covered by the UK carbon border tax?
There is no single construction-material list. HMRC’s current CBAM pages provide separate commodity-code lists for the five initial sectors. The practical question is always: does this exact code, for these exact goods, appear on the current sector list, and is it subject to an exclusion?
| Question to answer | Evidence to use | What a “yes” means |
|---|---|---|
| Is the product in one of the five initial sectors? | Material description and the UK customs classification. | Proceed to the sector-specific code list. |
| Does the complete commodity code appear on the list? | HMRC’s current aluminium, cement, fertiliser, hydrogen or iron-and-steel list. | The goods are potentially in scope, subject to exclusions and importer checks. |
| Is there a code-specific exclusion? | The exclusion notes and current HMRC policy information. | An apparent sector match may still be outside scope. |
| Is the list current? | Publication or update date and any UK Tariff change notice. | Use the current version, not an archived classification. |
For a particular shipment, the available facts may not establish the code or the result. In that situation, the correct entry in an internal review is “not stated—current HMRC list and classification evidence required,” rather than an assumption based on the product name.
How the importer and £50,000 test work together
Scope does not automatically mean every party registers
A listed code establishes that the goods need further CBAM analysis. It does not identify the person who must register until the importer for the declaration is established. In a supply chain, the manufacturer, UK customer, logistics provider and customs representative can have different roles.
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Use the relevant rolling 12-month period
For imports from 1 January 2027, track qualifying CBAM goods through the relevant rolling 12-month period. A rolling calculation looks back over the applicable 12 months as transactions occur; it is not limited to the financial year or calendar year unless HMRC’s detailed guidance says a particular calculation uses another period.
Track both completed imports and expected imports. A purchase programme, framework order or construction phase that is likely to push the value over £50,000 can be relevant before all deliveries arrive.
Do not ignore threshold exclusions
HMRC’s threshold rules contain exclusions. The value you see on an invoice may not be identical to the value that counts for the registration test. Apply the detailed HMRC definitions to each transaction and document the treatment of excluded items.
Plan for the registration opening date
Registration opens by 1 January 2028, while the scheme starts on 1 January 2027. If your business is liable during the first year, maintain complete records from the first relevant import so the eventual registration and any required information can be supported.
Records to retain for every decision
Build a shipment-level file rather than relying on a single annual total. At minimum, retain the following information where it is relevant to the goods and the declaration:
| Record | Why it matters |
|---|---|
| Complete goods description, composition and form | Supports the classification and shows what was actually imported. |
| Commodity code and the source or rationale for it | Allows the CBAM scope check to be reproduced. |
| HMRC list version or review date | Shows that the current code list was checked. |
| Evidence of any code-specific exclusion | Explains why a listed-sector product was treated as outside scope. |
| Customs declaration and entry details | Identifies the import and the party named on the declaration. |
| Importer and representation details | Supports the decision about who is legally responsible. |
| Import date and value | Feeds the relevant threshold and timing calculation. |
| Expected future imports | Shows how the business assessed anticipated liability. |
| Internal decision and reviewer | Creates an audit trail for the scope and registration conclusions. |
Keep records for shipments that you conclude are outside scope as well as those you include. HMRC says records matter even where the importer does not have to register, because the business must be able to show how it reached that conclusion.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Comparing several construction materials
When a project uses multiple imported products, review each product and each declaration separately. A useful comparison schedule has four fixed tests:
| Comparison point | Material A | Material B | Material C |
|---|---|---|---|
| Complete goods description and exact commodity code | Not stated without the product and declaration details. | Not stated without the product and declaration details. | Not stated without the product and declaration details. |
| Relevant HMRC sector list and exclusion check | Not stated; check the current sector list. | Not stated; check the current sector list. | Not stated; check the current sector list. |
| Person treated as importer | Not stated; review the declaration and representation terms. | Not stated; review the declaration and representation terms. | Not stated; review the declaration and representation terms. |
| Value and timing counted toward the registration test | Not stated; calculate under HMRC’s rolling-period rules. | Not stated; calculate under HMRC’s rolling-period rules. | Not stated; calculate under HMRC’s rolling-period rules. |
This format prevents a project team from grouping all “metals” or all “materials” together. It also exposes where one supplier’s classification or one delivery route differs from another’s.
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Worked decision paths for common construction purchases
Structural steel or fabricated iron-and-steel items
First establish the exact form and processing stage, then confirm the code on the import declaration. Compare that code with HMRC’s current iron-and-steel list and check whether an exclusion applies. If the code is listed, identify the importer and add the qualifying value to the relevant rolling-period calculation.
Aluminium products
Do not treat every aluminium article as covered or every aluminium shipment as excluded. Determine the product form and code, check the aluminium list, and look specifically for the scrap exclusions identified by HMRC. A fabricated product and a scrap load can follow different scope outcomes.
Cement
Use the cement code rather than a project description such as “concrete works.” Confirm whether the imported product itself, in its declared form, is on HMRC’s list. Then complete the importer, value, timing and record checks.
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Glass and ceramics are not in the initial January 2027 scope according to HMRC’s policy summary. Retain the product and code evidence supporting that conclusion, and monitor later policy or tariff updates rather than assuming the exclusion will never change.
Mixed or consolidated consignments
A single lorry, container or customs entry can contain goods with different codes. Separate the lines in the review. One line may be in scope while another is excluded or outside the five initial sectors. Do not apply the result for the dominant material to every item in the consignment.
Common mistakes and how to correct them
- Using a broad material name: replace “steel,” “metal” or “construction product” with the complete goods description and declaration code.
- Checking an old article: return to HMRC’s current sector list because codes can change with the UK Tariff.
- Stopping at the sector heading: verify the complete code and any code-specific exclusion.
- Assuming the broker is the importer: inspect the declaration and representation terms; a broker or haulier does not become the importer merely by handling the paperwork.
- Treating £50,000 as a simple annual allowance: apply the rolling 12-month and expected-import rules, including threshold exclusions.
- Keeping only invoices: retain the code, declaration, list version, importer evidence, dates and calculations needed to defend the decision.
- Ignoring goods outside scope: retain evidence for non-covered shipments too, because HMRC expects records supporting the conclusion that registration is not required.
- Combining different import flows: check who is importer and how value is counted for each relevant declaration and business.
A practical CBAM control process for a construction business
Before placing an order
- Ask the supplier for composition, form, processing and proposed commodity-code information.
- Compare the proposed code with the current HMRC sector list and investigate any mismatch.
- Confirm which UK entity will be named as importer and who, if anyone, will act as representative.
- Estimate qualifying imports expected from 1 January 2027 and flag any route toward the £50,000 threshold.
When the goods are shipped
- Check that the declaration code and goods description match the shipment.
- Save the declaration, value, date, list version and any exclusion analysis.
- Update the rolling 12-month and expected-import calculations.
During monthly or project reviews
- Reconcile import records to the CBAM tracking schedule.
- Review code changes, HMRC updates and UK Tariff changes.
- Reassess forecasts when a project phase, supplier or delivery route changes.
- Escalate disputed classifications before the next declaration.
Before registration or an HMRC query
- Confirm the liable importer for each relevant flow.
- Reperform the threshold calculation using HMRC’s detailed timing and exclusion rules.
- Assemble the shipment-level evidence and preserve records for imports made before registration opens.
Key dates and changes to monitor
| Date or period | What it means |
|---|---|
| 1 January 2027 | UK CBAM begins for specified goods across the UK, including Northern Ireland. |
| From 1 January 2027 | Apply the relevant rolling 12-month registration test and consider expected imports. |
| By 1 January 2028 | Registration opens, according to HMRC’s checklist. |
| Whenever HMRC or the UK Tariff changes a code | Recheck affected products and update internal classifications and evidence. |
The initial sector list is not a permanent substitute for checking the current rules. HMRC says commodity codes will be updated alongside UK Tariff changes to preserve product scope. Assign responsibility for monitoring those updates rather than relying on an unmaintained spreadsheet.
When to obtain specialist customs advice
Obtain specialist advice or an authoritative classification decision when the product has complex composition, multiple processing stages, a disputed code, an unusual scrap or by-product status, or a supply chain in which different parties could be treated as importer. Advice is also appropriate when a forecast is close to the £50,000 threshold, when expected imports are changing rapidly, or when the declaration does not clearly identify the responsible entity.
A specialist cannot replace the basic evidence. Give the adviser the technical specification, invoices, packing information, declarations, proposed codes, contracts and representation arrangements. Record the conclusion and the date on which the current HMRC list was checked.
The decision in one sentence
For every imported construction material, identify the precise goods and UK commodity code, match that code to HMRC’s current CBAM list, check exclusions and the 1 January 2027 scope, identify the importer, apply the detailed £50,000 registration test—including expected imports and exclusions—and retain the evidence.
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