CBAM Compliance Intelligence Report: Supplier Emissions Data vs Default Values Before UK CBAM 2027
- Ahtesham Shaikh
- Jun 17
- 18 min read
CBAM Journal | Sekason Research Limited | London
Published 2026 | Compliance Intelligence Series
Executive Summary
The European Commission's default-value escalation schedule confirms that default values are a designed cost penalty, not a neutral fallback: default-value adjustments rise from +10% in 2026 to +20% in 2027 and +30% from 2028 onward for many CBAM products. UK CBAM enters force on 1 January 2027 under the same two-track methodology — verified actual data or government default values — meaning this exposure question now applies on both sides of the Channel. HMRC has confirmed UK-specific default values will be published before commencement, but those figures remain unavailable at the time of this report, leaving Compliance Managers unable to quantify UK default-value exposure with precision.
The regulatory hierarchy is fixed: independently verified actual emissions data is the primary basis for CBAM liability calculation, and default values are a fallback rather than an equivalent option. This unquantified UK gap does not reduce the urgency of action — it increases it, since supplier data acquisition is currently the only confirmed lever available for reducing CBAM cost exposure.
Supplier engagement is also time-constrained: UK CBAM registration is expected to open in late 2026, leaving a narrow window to build supplier data pipelines before 1 January 2027.
This report sets out what is regulatorily confirmed, what remains an open question pending HMRC publication, and the specific actions a Compliance Manager should take now to convert that uncertainty into a managed risk rather than an unbudgeted one.
Top 5 Action Priorities
Priority | Action | Driver |
1 | Map CBAM-affected suppliers and import volumes now | UK registration threshold of £50,000 over a rolling 12-month period |
2 | Request actual emissions data from highest-volume suppliers first | EU default-value mark-up already confirmed at +10% to +30% |
3 | Build an evidence file for every emissions figure used | Draft UK secondary legislation requires monitoring and verification support |
4 | Track HMRC's UK default-value publication | Confirmed to arrive before 1 January 2027, date not yet set |
5 | Brief the board on unquantified UK default-value exposure | Registration window expected to open late 2026 |
Regulatory Context: Why Embedded Carbon Has Become a Compliance Risk
Evolution of EU CBAM and UK CBAM
EU CBAM converted from a reporting obligation into a financial one on 1 January 2026. The transitional period ran from 1 October 2023 to 31 December 2025, requiring quarterly reporting without certificate purchase; from 1 January 2026, authorised declarants must purchase and surrender CBAM certificates tied to embedded emissions. UK CBAM follows a different but parallel track: it has no transitional reporting-only phase and enters directly into a self-assessment liability regime on 1 January 2027, with the first accounting period closing 31 December 2027 and the first return and payment due 31 May 2028.
UK importers are not getting an EU-style transition period to practise reporting before money is on the line — the first UK CBAM return is also the first liability event. Organisations that wait until registration opens in late 2026 to begin building emissions-data processes will be doing so with a live financial deadline already running.
EU CBAM | UK CBAM | |
Transitional reporting phase | 1 Oct 2023 – 31 Dec 2025 | None |
Definitive/liability phase begins | 1 Jan 2026 | 1 Jan 2027 |
Liability mechanism | Certificate purchase and surrender | Self-assessed return and payment |
First financial deadline | 30 Sep 2027 (certificate surrender for 2026 imports) | 31 May 2028 (first return and payment) |
Registration threshold | Not confirmed in research data | £50,000 over rolling 12-month period |
Embedded Emissions Under CBAM
Embedded emissions are the greenhouse gas emissions released during the production of a CBAM-scope good, attributed to that specific good rather than to the importer or the import transaction. The obligation falls on the importer (UK) or the authorised declarant (EU) to calculate and report this figure for every consignment of in-scope goods — currently steel, aluminium, cement, fertilisers, and hydrogen under UK CBAM, with the EU regime additionally covering electricity.
Embedded emissions is the input variable that the CBAM rate is multiplied against to produce liability, which means an inflated or unverified number — whether from a conservative default value or from poor-quality supplier data — flows straight through to a larger CBAM bill.
Supplier Data vs Default Values: The Regulatory Principle
UK CBAM permits two methodologies for determining embedded emissions, and they are not equally weighted. The preferred basis is independently verified actual emissions data obtained from suppliers; the fallback basis is government-published default emissions values, used only where verified actual data is unavailable. This hierarchy is confirmed for the UK framework and structurally mirrored in the EU's published default-value schedule, which exists specifically to apply an escalating mark-up to importers who rely on it.
An importer may use actual data when a supplier can provide independently verified emissions figures for the specific goods in question, and must fall back to default values when no such verified data exists — whether because the supplier refuses to engage, cannot produce auditable figures, or operates in a jurisdiction without an emissions-data infrastructure.
The EU has made the cost of that fallback explicit and rising: a +10% adjustment in 2026, +20% in 2027, and +30% from 2028 onward for many products under default-value methodology. Every default-value reliance is therefore a probable cost penalty, and the EU schedule is the best available evidence of how steep that penalty is designed to be.
Compliance Obligations: What Importers Must Do
UK CBAM Reporting Requirements
UK CBAM registration is triggered at £50,000 of CBAM goods imported over a rolling 12-month period, or where an importer expects to exceed that threshold within the next 30 days. This is a forward-looking test as well as a backward-looking one: an importer does not need to have already crossed £50,000 to be liable for registration, since an expectation of doing so within 30 days is sufficient to trigger the obligation. Compliance Managers should treat the threshold as a trading-volume trigger to monitor continuously, not a one-off check performed at year-end.
Once registered, liable importers must self-assess their CBAM liability and submit returns to HMRC, with the first accounting period running to 31 December 2027 and the first return and payment due 31 May 2028. The operational burden sits upstream of the return itself: draft UK secondary legislation includes requirements around emissions calculation, monitoring, and verification, meaning the return is only as defensible as the data-collection process behind it.
The consultation on these rules closed 21 May 2026; the research data does not confirm whether or when HMRC will issue a formal response before commencement, which means the operational detail of what counts as adequate evidence is not yet settled.
EU CBAM Declarant Obligations
EU CBAM's definitive phase is live now, not pending. Authorised CBAM declarants must report embedded emissions for imported goods through the CBAM Registry and — distinct from the transitional period — must purchase and surrender CBAM certificates corresponding to those embedded emissions. This certificate mechanism is the operative difference between the transitional and definitive phases: reporting alone no longer satisfies the obligation.
For organisations operating across both jurisdictions, the EU obligation is the more immediate one. The certificate-surrender deadline for 2026 imports falls on 30 September 2027 — well before UK CBAM's first return is due on 31 May 2028. Any organisation treating UK CBAM as the more urgent compliance project is misreading the calendar.
Evidence, Verification and Audit Requirements
Draft UK secondary legislation requires importers to be able to substantiate the emissions figures used in CBAM returns, which means every actual-data figure submitted must be backed by evidence capable of surviving HMRC scrutiny — not simply a supplier-provided number taken at face value.
The documentation burden is highest precisely where supplier data is hardest to obtain: overseas suppliers in jurisdictions without mature emissions-reporting infrastructure are the least likely to provide audit-ready figures, and the most likely to push the importer toward default values, which, per the EU schedule, carry their own escalating cost.
Compliance Managers should treat evidence-readiness as a parallel workstream to data collection, not a downstream formality — a supplier emissions figure with no supporting documentation is functionally indistinguishable from no data at all once HMRC's verification rules are finalised.
Compliance Evidence Checklist | Status to confirm |
Supplier emissions figures with traceable methodology | Required for actual-data basis |
Record of request and supplier response (including non-response) | Supports default-value justification |
Date-stamped emissions data tied to specific consignments | Required to link evidence to liability period |
Verification standard applied to supplier figures | [RESEARCH GAP — pending HMRC consultation outcome] |
Internal sign-off trail for emissions figures used in return | Recommended pending final HMRC audit criteria |
Key Dates and Deadlines
Chronological CBAM Timeline (2023–2028)
Three dates carry the highest practical consequence for a Compliance Manager today.
13 February 2026 is when the European Commission published its definitive-phase default values, setting the benchmark against which any EU supplier data is now measured.
21 May 2026 is when the UK consultation on emissions calculation, monitoring, and verification rules closed, after which the final shape of UK evidence requirements is expected to follow.
1 January 2027 is the UK CBAM commencement date — the hard deadline against which all supplier-engagement work must be completed. The table below carries the full chronology.
Date | Event |
1 October 2023 | EU CBAM transitional period begins |
31 December 2025 | EU CBAM transitional period ends |
1 January 2026 | EU CBAM definitive phase begins |
13 February 2026 | European Commission publishes definitive-phase default values dataset |
21 May 2026 | UK consultation closes on emissions calculation, monitoring and verification rules |
Late 2026 | UK CBAM registration regime expected to open |
1 January 2027 | UK CBAM enters force |
30 September 2027 | First EU CBAM certificate surrender deadline for 2026 imports |
31 December 2027 | End of first UK accounting period |
31 May 2028 | First UK CBAM return and payment due |
Financial Exposure and Risk
How Embedded Emissions Influence CBAM Liability
UK CBAM liability is calculated using embedded emissions multiplied by the applicable CBAM rate, adjusted for carbon price relief paid overseas. The relationship is direct: liability rises and falls with the embedded emissions figure used, which means the choice of methodology — actual data or default value — is a cost determinant, not a reporting preference. Where embedded emissions are inaccurate, whether overstated through a conservative default or understated through poor-quality supplier data later corrected on audit, liability moves with it.
What can be stated with confidence is the direction of effect: any factor that inflates the embedded emissions figure, including reliance on a conservative default value, inflates liability by the same multiplicative relationship.
The Cost of Using Default Values
Default values are not a cost-neutral convenience. The European Commission's published default-value methodology for many CBAM products applies a +10% adjustment in 2026, rising to +20% in 2027, and +30% from 2028 onward.
These are deliberate conservative mark-ups, designed — per the Commission's own framing — to incentivise the submission of actual emissions data rather than reliance on government defaults. An importer using default values in 2027, the same year UK CBAM commences, would under the EU schedule be absorbing a 20% uplift on the relevant emissions figure before any liability calculation is even applied.
This is the report's most consequential gap, and it should not be filled with an assumed UK figure. The EU has demonstrated that governments price default-value reliance as a penalty, not a parity option, and there is no regulatory signal in the research data suggesting the UK will adopt a materially different philosophy. Compliance Managers should treat supplier data acquisition as the only confirmed lever for reducing CBAM cost exposure, while tracking HMRC's eventual default-value publication closely.
Default Value Exposure — What Is Confirmed | What Is Not Yet Confirmed |
EU default-value mark-up: +10% (2026), +20% (2027), +30% (2028+) | UK default-value mark-up percentage |
Mark-up applies to "many CBAM products" under EU methodology | Which UK CBAM sectors will see the steepest UK default-value gap |
UK default values confirmed to be published before 1 Jan 2027 | Exact publication date and methodology |
Regulatory intent (incentivise actual data) confirmed by EU framing | Whether UK will mirror the EU's specific escalation structure |
Carbon Price Interaction and Cost Drivers
EU CBAM certificates are priced with direct reference to EU ETS carbon prices, and certificate requirements scale with reported embedded emissions: a higher emissions figure requires more certificates, at whatever the prevailing EU ETS price is at the time of surrender.
This creates a second variable layer on top of the emissions-data question — even with accurate emissions data, an importer's certificate cost is exposed to EU ETS price movement between the reporting period and the surrender deadline.
The UK framework includes carbon price relief, adjusting UK CBAM liability for carbon prices already paid overseas on the embedded emissions in question. This mechanism, by its nature, rewards importers who can demonstrate not only emissions data but also evidence of carbon price paid at source, meaning the documentation burden identified above extends beyond emissions figures into carbon-pricing evidence for any importer seeking to claim relief.
Board-Level Risk Assessment Framework
A Compliance Manager briefing a CFO on this topic should frame the exposure in three components a finance function will recognise: a confirmed cost driver, an unquantified cost driver, and a time-bound mitigation cost. The confirmed cost driver is the EU default-value mark-up schedule, published, escalating, and already applicable to current EU CBAM imports.
The unquantified cost driver is the UK default-value mark-up, confirmed to exist and confirmed to be published before 1 January 2027, but not yet modellable in pounds. The time-bound mitigation cost is the operational investment required to secure verified supplier data before that commencement date — controllable now, and harder to control once registration opens in late 2026 and the commencement deadline is fixed.
This framing gives the CFO a decision they can act on immediately: the cost of supplier engagement now is a known, budgetable figure, while the cost of inaction is an unquantified but directionally confirmed penalty, benchmarked against an EU schedule that already demonstrates government appetite for conservative mark-ups. The board-level ask is direct — fund supplier data acquisition as a cost-avoidance measure against a liability that is structurally certain to apply, even though its exact UK magnitude is not yet public.
Sector-Specific Impact Analysis
Steel
Steel producers show significant variation between actual and default emissions factors, and importers relying on defaults face materially higher CBAM costs as a result. Production methods vary substantially — from primary blast-furnace routes to electric-arc-furnace recycling routes — and that variance is precisely what a default value, calibrated to a conservative industry-wide benchmark, cannot capture. Compliance Managers sourcing steel from suppliers using lower-emissions production routes have the most to gain from securing actual data, since the gap between their true emissions and the default benchmark is likely to be largest.
Aluminium
Aluminium emissions vary significantly depending on electricity source and production technology, which is the confirmed reason verified supplier data carries particular importance in this sector. An aluminium smelter powered by hydroelectricity and one powered by coal-fired generation can have radically different embedded emissions for what is, on paper, the same product category, meaning a sector-wide default value is almost certain to misrepresent either end of that range. Buyers importing aluminium should treat electricity-source disclosure as a specific, named data point to request from suppliers, not a generic emissions-data ask.
Cement
The European Commission has identified substantial differences between actual cement emissions and default values in some jurisdictions, creating potentially large cost distortions. The Commission's own language — "substantial" and "large" — signals this is not a marginal sector for default-value risk, and Compliance Managers should treat cement suppliers as a category warranting early data requests.
Fertilisers
Fertiliser production is highly emissions-intensive, which is the confirmed reason this sector is particularly sensitive to embedded emissions calculations. High baseline emissions intensity means that even a moderate percentage gap between actual and default values translates into a larger absolute cost impact than the same percentage gap would produce in a lower-emissions sector. This makes fertiliser imports a high-leverage target for supplier data acquisition effort relative to the financial return.
Hydrogen
Hydrogen sits within the scope of both UK and EU CBAM, and its emissions intensity varies dramatically depending on production pathway — the difference between so-called "green," "blue," and "grey" hydrogen production routes is, by definition, a difference in embedded carbon. Because pathway determines emissions so completely, actual supplier data is close to essential for any importer wanting an accurate hydrogen CBAM liability figure, since a default value calibrated across all pathways cannot meaningfully represent any single one of them.
Sector | Confirmed Exposure Driver | Data Confirmed in Research |
Steel | Production-route variance (blast furnace vs electric arc) | Materially higher costs under defaults — confirmed |
Aluminium | Electricity source and production technology | Significant variance — confirmed |
Cement | Jurisdictional variance in actual vs default values | Substantial differences — confirmed; scale not quantified |
Fertilisers | High baseline emissions intensity | Particular sensitivity — confirmed |
Hydrogen | Production pathway (green/blue/grey) | Dramatic variance — confirmed; pathway-specific figures not in research data |
Practical Action Framework: The Supplier Data Acquisition Blueprint
Step 1: Map CBAM Exposure Across Suppliers
The Compliance Manager, supported by procurement, should produce a single register of every supplier providing CBAM-scope goods — steel, aluminium, cement, fertilisers, or hydrogen — with import volume and value attached to each. This register is the prerequisite for the £50,000 rolling 12-month registration threshold assessment, and it must be built from actual import records rather than approximated. Completion of this step produces a defensible answer to whether the organisation is in scope, which HMRC's forward-looking 30-day test requires it to be able to answer continuously, not just annually.
Step 2: Prioritise High-Risk Suppliers
Using the sector exposure findings above, rank suppliers by combined import volume and sector-specific default-value risk: steel and aluminium suppliers with unknown production routes, and any cement, fertiliser, or hydrogen supplier with no existing emissions disclosure, should sit at the top of the list. The output of this step is a prioritised contact list, owned by procurement with compliance sign-off, ranking suppliers by the financial consequence of leaving them on default values rather than by ease of contact.
Step 3: Request and Validate Emissions Data
Compliance should issue a standardised data request to prioritised suppliers, specifying exactly what evidence is required — methodology, production route or electricity source where sector-relevant, and supporting documentation — rather than asking for "emissions data" in generic terms. Each response should be logged against the Compliance Evidence Checklist set out above, and any submission lacking traceable methodology should be treated as incomplete rather than accepted at face value, since an unverifiable actual-data figure carries the same audit risk as a default value without its cost certainty.
Step 4: Manage Non-Responsive Suppliers
Where a supplier does not respond within a defined window, the Compliance Manager should record the request and non-response as evidence in its own right — this record supports the importer's justification for falling back to default values and demonstrates good-faith effort under any future HMRC audit. For high-volume non-responsive suppliers, the organisation should also assess whether the default-value cost penalty, confirmed for EU CBAM and expected but not yet quantified for UK CBAM, justifies a procurement conversation about supplier diversification ahead of 1 January 2027.
Step 5: Build Documentation and Audit Readiness
Every emissions figure used in a CBAM return, whether actual or default, should sit inside an evidence file containing the request record, the supplier response or non-response, the methodology disclosed, and the internal sign-off confirming how the figure was used. This step should run continuously alongside Steps 1 to 4, not as a final cleanup exercise: HMRC's verification requirements remain unsettled following the consultation that closed 21 May 2026, and a contemporaneous evidence trail is more defensible than one reconstructed after the fact.
Step 6: Establish Internal Governance
A named owner, typically the Compliance Manager, should hold accountability for the supplier data register, with clear escalation routes to procurement for supplier engagement and to finance for liability forecasting. This governance structure should be documented with a RACI-style responsibility split, so that when HMRC's UK default-value figures and finalised verification rules are published, the organisation has a functioning process ready to absorb them immediately rather than building that process under deadline pressure once registration opens in late 2026.
Step | Owner | Output | Completion Signal |
1. Map exposure | Compliance + Procurement | Supplier/volume register | Every CBAM-scope supplier listed with import value |
2. Prioritise | Compliance | Ranked supplier list | List ranked by sector risk and volume |
3. Request and validate | Compliance | Logged supplier responses | Each response checked against evidence checklist |
4. Manage non-response | Compliance + Procurement | Non-response record; diversification review | Record retained; high-volume cases escalated |
5. Document and audit-ready | Compliance | Evidence file per emissions figure used | File complete before return submission |
6. Governance | Compliance Manager (named) | RACI structure | Escalation routes defined and tested |
UK CBAM Readiness Scorecard
Readiness Dimension Assessment
Score each dimension from 0 to 20 based on current organisational status, then sum the five scores for a total readiness position out of 100.
Supplier Readiness (0–20) — How many CBAM-scope suppliers, by import value, have already been contacted for emissions data? Score 0 if no supplier register exists; score 20 if all high-volume suppliers have been contacted with a standardised request.
Data Availability (0–20) — What proportion of CBAM-scope import value currently has actual emissions data attached, versus an assumed reliance on default values? Score 0 if no actual data has been received; score 20 if actual data covers the substantial majority of import value.
Verification Readiness (0–20) — Does the organisation have an evidence file structure in place capable of substantiating emissions figures under audit? Score 0 if no evidence process exists; score 20 if every emissions figure currently in use has a complete, traceable evidence file.
Reporting Capability (0–20) — Is there a defined internal process and named owner for compiling and submitting the UK CBAM return when registration opens? Score 0 if no process or owner is defined; score 20 if a tested process and accountable owner are in place ahead of the late-2026 registration window.
Financial Exposure Awareness (0–20) — Has the organisation modelled its potential CBAM liability under both an actual-data scenario and a default-value scenario, including the confirmed EU escalation logic as a directional benchmark? Score 0 if no modelling has occurred; score 20 if liability has been modelled and presented at board level.
Score Range | Interpretation |
0–30 | High exposure — no meaningful supplier data process in place before registration opens |
31–60 | Partial readiness — process started but material gaps in coverage or evidence |
61–85 | Substantially prepared — most high-volume suppliers and evidence processes in place |
86–100 | Audit-ready — comprehensive actual-data coverage and tested governance |
Strategic Outlook: 2026–2027
Expected UK Secondary Legislation Developments
HMRC published draft secondary legislation in two packages — 10 February 2026 and 9 April 2026 — covering CBAM administration, rate calculation, carbon price relief, emissions calculation, and monitoring and verification. The consultation on this draft legislation closed 21 May 2026. The research data does not confirm a specific publication date for HMRC's response, so organisations should not assume a fixed timeline; what is confirmed is that finalised rules must exist in some form before UK CBAM commencement on 1 January 2027, since the return process cannot operate on draft rules alone.
Future Treatment of Default Values
HMRC has confirmed that official UK default emissions values will be published before 1 January 2027, but the specific values, and any escalation structure analogous to the EU's confirmed +10%/+20%/+30% schedule, are not yet available. The EU has already established the precedent of a deliberately conservative, escalating mark-up designed to incentivise actual data submission; organisations should monitor the GOV.UK CBAM guidance page directly for the UK publication rather than relying on secondary commentary.
Potential HMRC Enforcement Priorities
[NOTE: RESEARCH GAP - The research data contains no confirmed information on HMRC's enforcement priorities, audit selection criteria, or penalty regime for UK CBAM. This should not be speculated upon and should be sourced separately once HMRC publishes operational guidance closer to the 1 January 2027 commencement date.]
What Compliance Managers Should Monitor
Three confirmed publication events sit on the regulatory watchlist:
HMRC's response to the secondary legislation consultation that closed 21 May 2026; the opening of the UK CBAM registration window, expected in late 2026; and HMRC's publication of UK-specific default emissions values, confirmed to arrive before 1 January 2027.
Each will convert a currently unquantified element of this report, verification standards, registration mechanics, and default-value cost exposure respectively, into a confirmed figure, and each should trigger an immediate review of the organisation's readiness scorecard once published.
Watch Item | Current Status | Expected Resolution |
UK secondary legislation (consultation response) | Consultation closed 21 May 2026 | Before 1 Jan 2027 (exact date not confirmed) |
UK CBAM registration window | Not yet open | Expected late 2026 |
UK default emissions values | Not yet published | Confirmed before 1 Jan 2027 |
HMRC enforcement/audit criteria | Not addressed in available research | Not yet confirmed |
FAQ Section
How are embedded emissions calculated under UK CBAM?
Liability is calculated by multiplying embedded emissions by the applicable CBAM rate, adjusted for carbon price relief on emissions already priced overseas. Embedded emissions can be determined using either independently verified actual supplier data or government-published default values. The precise calculation formula and rate are set out in HMRC's secondary legislation, which was still in consultation as of 21 May 2026.
Can I use default values instead of supplier emissions data under UK CBAM? Yes, default values are a permitted fallback under UK CBAM where verified actual emissions data is unavailable. They are not a cost-neutral equivalent: the EU's parallel default-value methodology applies an escalating mark-up of +10% in 2026, +20% in 2027, and +30% from 2028 onward, and HMRC has confirmed UK-specific default values will be published before 1 January 2027.
How much higher could my CBAM liability become if I rely on default values?
The exact UK figure is not yet published. The EU's confirmed default-value methodology applies mark-ups of +10% (2026), +20% (2027), and +30% (2028 onward) for many CBAM products, signalling the direction and design intent of default-value pricing. Treat this as a directional benchmark, not a confirmed UK percentage, until HMRC publishes its own figures.
What should I do if an overseas supplier refuses to provide emissions data?
Record the request and the refusal or non-response as formal evidence, since this supports your justification for using default values under audit. For high-volume suppliers, assess whether the confirmed cost penalty of default-value reliance justifies a procurement review of alternative, more data-transparent suppliers ahead of 1 January 2027.
What evidence should I retain to support my CBAM emissions calculations?
Retain the supplier's disclosed methodology, the date-stamped data tied to specific consignments, the record of your request and the supplier's response, and an internal sign-off trail confirming how the figure was used. HMRC's exact verification standard remains pending the outcome of the consultation that closed 21 May 2026, so build an evidence file capable of supporting scrutiny under multiple possible standards.
Which suppliers should I prioritise first when collecting CBAM emissions data?
Prioritise by import volume combined with sector-specific default-value risk: steel and aluminium suppliers with unknown or high-emissions production routes, and any cement, fertiliser, or hydrogen supplier with no existing emissions disclosure. These sectors carry the largest confirmed gap between actual and default emissions values.
References and Sources
This article is backed by authoritative source and research;
HM Treasury / HMRC — Carbon Border Adjustment Mechanism (CBAM): Policy Summary (9 April 2026)
European Commission DG TAXUD — Carbon Border Adjustment Mechanism (Current)
https://taxation-customs.ec.europa.eu/carbon-border-adjustment-mechanism_en
European Commission DG TAXUD — CBAM Registry and Reporting (2026)
European Commission DG TAXUD — CBAM Legislation and Guidance (13 February 2026)
HMRC — Sample Email – UK CBAM Communications Resources (9 April 2026)
European Commission — Call for Evidence on CBAM Emissions Methodology, Free Allocation Adjustment and Carbon Price Paid in Third Countries (29 August 2025)
UK Government — EU Carbon Border Adjustment Mechanism Guidance (13 April 2026)
UK Parliament Research Briefing — Carbon Border Adjustment Mechanism (10 April 2026)
https://researchbriefings.files.parliament.uk/documents/CBP-9935/CBP-9935.pdf
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