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UK CBAM for Hydrogen Importers 2027: Compliance, Registration & Emissions Data Guide

Writer: CBAM Research Team
CBAM Research Team
Sep 25
26 min read

CBAM Journal — Sekason Research Limited, London

CBAM Journal Research & Intelligence Team, Sekason Research Limited. Published September 2026. Data verified: 25 September 2026 · Next review trigger: EU CBAM Q3 2026 certificate price publication, scheduled 5 October 2026.


Disclaimer

This report is provided for information purposes only and does not constitute legal, tax, financial or regulatory advice. It should not be relied upon as a substitute for advice from a qualified professional adviser familiar with your organisation’s specific circumstances. CBAM Journal and Sekason Research Limited accept no liability for actions taken or not taken on the basis of this report. Readers should consult a qualified adviser before making compliance, financial or operational decisions relating to UK CBAM or EU CBAM. Read complete disclaimer here: https://www.cbamjournal.com/disclaimer



CBAM Journal graphic announcing 1 January 2027 UK CBAM entry into force for hydrogen, with red-and-white title design.

1. Executive Summary

Hydrogen enters UK CBAM scope under commodity code 2804 10 from 1 January 2027. As at 25 September 2026, the final default emissions value for hydrogen and the sectoral CBAM rate that determines a hydrogen importer’s actual liability remain unpublished, even as the surrounding legal framework — Finance Act 2026 and four sets of secondary regulations — is now substantially in force. The £50,000 registration threshold tests begin operating on 1 January 2027, a full twelve months before HMRC’s registration service itself opens on 1 January 2028, leaving importers to self-monitor liability with no formal mechanism yet available to record it. That combination defines the compliance problem this report addresses: the rules on what an importer must do are settled; the rules on what it will cost are not.


Finance Act 2026 establishes UK CBAM as a charge on specified imported goods, with the importer as the liable person under s.149. Hydrogen was confirmed within scope by HMRC’s hydrogen scope guidance, which identifies commodity code 2804 10 as liable, and the administrative, rate, carbon-price-relief, and emissions-and-verification regulations needed to operate the charge have all now been laid — the last of them, S.I. 2026/995, covering emissions calculation and verification, was laid as recently as 9 September 2026. Importers must track their own threshold status against a compliance obligation that exists before the administrative system built to receive it does.


This report gives Compliance Managers the operational sequence that HMRC guidance, taken alone, does not assemble into one workflow: what to request from an overseas hydrogen producer, how to decide between actual and default emissions data, what evidence supports a carbon price relief claim, and how to build the internal control system — spanning procurement, customs, sustainability and finance — needed to make the first CBAM return, due 31 May 2028, defensible. It draws exclusively on primary UK legislation and HMRC guidance current to 25 September 2026, states plainly where an input remains unpublished, and treats the outstanding autumn 2026 HMRC guidance wave as a regulatory variable to track rather than a number to forecast. It does not attempt to state a UK hydrogen CBAM cost per tonne, because that figure cannot yet be produced honestly. It sets out, in full, what a hydrogen importer’s compliance function must have in place before the accounting period that determines it begins.


2. Regulatory Context


2.1 What UK CBAM Is and the Legal Basis

  • FINDING: UK CBAM is established by Finance Act 2026, which received Royal Assent on 18 March 2026, and s.149(1) sets the charge as the sectoral domestic price applicable to the CBAM good multiplied by the tonnes of carbon dioxide equivalent emissions embodied in it.

  • SO WHAT: A hydrogen importer’s liability is the product of exactly two variables — sectoral price and embodied emissions — and neither has a published figure for hydrogen as at 25 September 2026.

  • NOW WHAT: Compliance teams must brief finance functions by 31 December 2026 that no defensible 2027 liability estimate exists yet, so that internal budgeting does not rest on an unconfirmed number.


Finance Act 2026 Part 5, sections 143 to 150 and Schedule 16, is the primary charging instrument for UK CBAM. It establishes the charge in principle and identifies the importer of a CBAM good as the liable person. The operative charging provision, s.149(1), states: “CBAM is charged at an amount equal to the sectoral domestic price applicable in respect of the CBAM good multiplied by the number of tonnes of carbon dioxide equivalent emissions embodied in the CBAM good.”

That single sentence is the entire architecture of the charge. A hydrogen importer’s eventual bill depends on two inputs published by government, not calculated by the importer: the sectoral domestic price for hydrogen, and the embodied-emissions figure attaching to the specific shipment. Everything else in the UK CBAM system — registration, returns, verification, carbon price relief — exists to determine those two numbers accurately and evidence them defensibly. The statute is settled law; the numbers it depends on for hydrogen are not yet published, a distinction this report returns to throughout Section 5.


2.2 Hydrogen’s Scope Under UK CBAM

  • FINDING: HMRC’s hydrogen scope guidance identifies commodity code 2804 10 as a liable CBAM good, placing hydrogen alongside aluminium, cement, fertiliser, and iron and steel as one of the five sectors within UK CBAM; electricity is not currently in scope.

  • SO WHAT: Scope determination for hydrogen is a commodity-code exercise, not a judgement call, which means misclassification risk sits squarely with the importer’s own customs documentation.

  • NOW WHAT: Compliance Managers must audit all hydrogen import commodity codes against 2804 10 and escalate any borderline classification to customs before 31 December 2026, ahead of the scope’s 1 January 2027 commencement.


HMRC’s guidance confirms that hydrogen is one of five UK CBAM sectors, identified under commodity code 2804 10. This is a narrower and more specific scope determination than “hydrogen is covered” — it means the classification exercise a compliance function must run is a code check against import documentation, not a product-level assessment.

The UK’s System Boundaries Document (version 1.00, published 13 July 2026) sets out the production routes and processes relevant to determining which hydrogen imports fall within this scope, though the detailed technical content of that boundary-setting exercise is addressed further in Section 6.1. Electricity, notably, sits outside the current UK CBAM sector list even though it is within scope for the equivalent EU regime — one of several structural differences addressed in the section that follows.


2.3 How UK CBAM Differs From EU CBAM for Hydrogen

  • FINDING: EU CBAM’s definitive regime began on 1 January 2026 — a full year before UK CBAM commences — and the EU CBAM certificate price stood at €75.28/tCO₂ for Q2 2026, published 6 July 2026, while UK CBAM does not become financially operative until the 2027 accounting period, with the first UK payment due 31 May 2028.

  • SO WHAT: A Compliance Manager with both UK and EU hydrogen exposure is running two entirely different compliance clocks and cost bases in parallel, and treating them as one system creates a direct risk of misapplying EU figures to a UK filing.

  • NOW WHAT: Maintain separate UK and EU CBAM compliance calendars from 1 January 2027, and do not apply the EU hydrogen default value to a UK return under any circumstances, since no UK default value has yet been published.


UK CBAM and EU CBAM are not parallel implementations of the same idea on different start dates. EU CBAM is already a live, financially operative system: its definitive regime began 1 January 2026, importers above the 50-tonne threshold require authorised-declarant status, and the EU has a published, product-specific default emissions value for hydrogen — 10.820 tCO₂e/t for CN 2804 10 00, under Commission Implementing Regulation (EU) 2025/2621 as corrected by (EU) 2026/1740. UK CBAM, by contrast, does not begin charging until the 2027 accounting period, and its first return and payment fall due 31 May 2028 — roughly eight months after the EU’s first declaration and surrender deadline of 30 September 2027 for 2026 imports.


The two regimes also diverge on mechanism: the EU applies a certificate-purchase system tied to the EU ETS allowance price and a free-allocation adjustment (97.5% in 2026, falling to 95% in 2027), while UK CBAM under s.149 applies a direct sectoral-price-times-emissions charge with no certificate market. For a hydrogen importer moving product into both jurisdictions, the practical implication is that the EU’s published hydrogen default value of 10.820 tCO₂e/t has no status under UK CBAM and must never be used to estimate a UK liability.


Table: UK vs EU CBAM — Hydrogen Comparison

Feature

UK CBAM

EU CBAM

Scope start date

1 January 2027

1 January 2026

Commodity code (hydrogen)

2804 10

CN 2804 10 00

Hydrogen default emissions value

Not yet published (as at 25 September 2026)

10.820 tCO₂e/t (Reg. (EU) 2025/2621, corrected by (EU) 2026/1740)

Charging mechanism

Sectoral domestic price × embodied emissions (Finance Act 2026, s.149)

Certificate purchase linked to EU ETS price, with free-allocation adjustment

First filing/payment

First return/payment due 31 May 2028

First declaration/surrender due 30 September 2027


3. Compliance Obligations

3.1 Registration: The £50,000 Threshold Tests

  • FINDING: HMRC’s registration guidance confirms two thresholds apply from 1 January 2027 — a forward-looking test triggered by £50,000 or more of expected CBAM imports within the next 30 days, and a backward-looking test triggered by £50,000 or more imported in the previous 12 months — while businesses that trigger registration during 2027 have until 31 January 2028 to register.

  • SO WHAT: Importers must self-monitor threshold status for up to twelve months with no registration portal available to formalise or confirm that position, since HMRC’s registration service does not open until 1 January 2028.

  • NOW WHAT: Build an internal import-value tracker measuring both the forward-looking and backward-looking tests from 1 January 2027, and do not wait for the registration service to open before starting to monitor.


HMRC guidance addresses registration across several separate publications, which can make the trigger date for liability and the date the registration service itself opens easy to conflate. The forward-looking test asks whether a business expects £50,000 or more of CBAM imports within the next 30 days; the backward-looking test asks whether it has imported £50,000 or more in CBAM goods within the preceding 12 months; both tests apply from 1 January 2027, and whichever test is triggered first determines when the liability begins.


Critically, the registration service — the system through which a business actually registers with HMRC — does not open until 1 January 2028. A business that triggers registration during 2027 is given until 31 January 2028 to complete that registration. The result is a full year in which an importer can be liable under the threshold tests before any formal mechanism exists to register that liability, which is why the internal tracking obligation in the NOW WHAT above cannot be deferred to the registration service’s opening date.


Table: Registration Decision Sequence

Step

Test/Event

Date

Action

1

Forward-looking test (£50,000 expected in next 30 days)

Applies from 1 January 2027

Monitor projected import value continuously

2

Backward-looking test (£50,000 in preceding 12 months)

Applies from 1 January 2027

Monitor rolling 12-month import value

3

Registration deadline (if triggered during 2027)

31 January 2028

Register via HMRC service once open

4

Registration service opens

1 January 2028

Formal registration becomes possible

3.2 The CBAM Return: Required Information

  • FINDING: The Carbon Border Adjustment Mechanism (Administrative Provisions) Regulations 2026, S.I. 2026/802, regulation 10, prescribes the CBAM return’s content, and the first UK accounting period runs 1 January to 31 December 2027, with the first return and payment due 31 May 2028.

  • SO WHAT: Every field the return requires — 8-digit commodity code, weight, carbon price relief claimed, and place of origin — must exist as accurate, retrievable data at the point of import, or it cannot be reconstructed defensibly at filing.

  • NOW WHAT: Design the 2027 shipment record template so it captures all four prescribed fields from the first 2027 shipment, and have that template operational by 1 January 2027.


Finance Act 2026, Schedule 17, paragraph 7, establishes the requirement to make a CBAM return, and S.I. 2026/802, regulation 10, sets out its detailed content requirements. The prescribed information includes the 8-digit commodity code for the imported goods, their weight, any carbon price relief being claimed, and the place of origin. None of these fields is complex individually, but each depends on data captured accurately at the point of import rather than assembled retrospectively — and because the first accounting period runs the entirety of calendar year 2027 with the return not due until 31 May 2028, a data-capture failure early in 2027 will not surface as a filing problem until well over a year later, by which point supplier records, verification evidence, or internal shipment data may no longer be readily available.


3.3 Actual Emissions Data and Verification Requirements

  • FINDING: The Carbon Border Adjustment Mechanism (Emissions and Verification) Regulations 2026, S.I. 2026/995, regulation 12(1), requires that “all verified emissions data for a CBAM good must be verified by a person (‘a verifier’),” and these regulations come into force on 1 January 2027.

  • SO WHAT: An importer cannot self-certify emissions data — a verification failure at the supplier or verifier level becomes the importer’s own compliance failure at the point of filing.

  • NOW WHAT: Compliance Managers must issue structured supplier data requests — covering installation identity, production route, monitoring period, emissions intensity and verifier identity — before the first 2027 shipment is booked, not after it arrives.


S.I. 2026/995, regulations 3 to 15, establish the full framework for how embodied emissions are calculated for a UK CBAM good: calculation of actual emissions, default values, attribution rules, precursor emissions, monitoring requirements, verification, verifier accreditation, verification reporting, and record-keeping. Regulation 12(1) is the operative verification requirement, and it is unambiguous — verified emissions data must be verified by an accredited verifier, not asserted by the importer or the producer unverified. HMRC’s confirmed position requires that actual emissions data be obtained from the producer and independently verified before it can be relied on for a CBAM return. The specific accreditation criteria a verifier must meet, and the detailed monitoring and reporting methodology an importer’s supplier must follow, are not fully set out in guidance published as at 25 September 2026;

HMRC has indicated that further detail on monitoring, reporting and verification is expected later in 2026. This report therefore confirms the requirement to verify — it does not, and cannot yet, describe the full accreditation and methodology detail, which is addressed in the Research Limitations statement in Section 10.


3.4 Record-Keeping: Six-Year Retention

  • FINDING: S.I. 2026/995, regulation 16, requires a person making a CBAM return to retain the verification report or good-specific verification summary for six years, and HMRC guidance identifies a £500 fixed penalty for failure to retain required records.

  • SO WHAT: Record retention is a distinct, separately penalised obligation from the return itself, so a compliant filing does not by itself satisfy the retention requirement.

  • NOW WHAT: Set retention-system rules — document type, retention start date, six-year expiry date — before the first verification report is received, which for a 2027 shipment could be as early as 1 January 2027.


The six-year retention period applies specifically to verification reports and good-specific verification summaries, not merely to the return itself, and HMRC’s separate operational guidance confirms a £500 fixed penalty attaches to a failure to keep required records. Because the retention clock runs from when a record is created rather than from the filing date, a hydrogen importer receiving verification evidence for shipments across calendar year 2027 will be managing overlapping six-year retention windows from the outset, not from a single fixed filing date in 2028.


4. Key Dates and Deadlines

UK CBAM obligations are front-loaded into 2027, even though the registration service and first filing deadline fall in 2028. The compliance calendar below sets out every confirmed date affecting a UK hydrogen importer between now and the first UK CBAM filing, with EU comparator dates shown separately for importers managing parallel exposure.



Table: UK CBAM Hydrogen Compliance Calendar

Date

Regime

Milestone

Autumn 2026 (webinars October 2026)

UK

HMRC further guidance and webinars expected, covering default values, rates and monitoring/verification detail

1 January 2026

EU

EU CBAM definitive regime begins

1 January 2027

UK

UK CBAM comes into force; hydrogen imports become subject to UK CBAM where the goods and importer meet the statutory conditions

1 January 2027

UK

£50,000 forward-looking and backward-looking registration tests begin operating

1 January 2027

UK

First UK CBAM accounting period begins

Q3 2027 (30 September)

EU

First EU CBAM declaration and surrender, for 2026 imports

1 January 2028

UK

UK CBAM registration service opens

31 January 2028

UK

Registration deadline for businesses that triggered registration during 2027

31 May 2028

UK

First UK CBAM return and payment deadline, for the 2027 accounting period


5. Financial Exposure and Risk


5.1 How the UK CBAM Charge Is Calculated

  • FINDING: Under Finance Act 2026, s.149, the charge equals sectoral domestic price multiplied by embodied emissions, and as at 25 September 2026 both the final 2027 hydrogen default emissions value and the final 2027 sectoral CBAM rate remain unpublished, though HMRC has indicated an illustrative rate is expected during autumn 2026.

  • SO WHAT: No defensible UK hydrogen CBAM £-per-tonne figure can be produced today, which means any such figure currently in circulation — from a third party or otherwise — is not authoritative.

  • NOW WHAT: Treat rate and default-value publication as a tracked regulatory trigger rather than an assumption, and do not present third-party liability estimates to finance functions as confirmed figures before HMRC publishes.


The s.149 charging formula is simple in structure and entirely dependent on two government-published inputs. For hydrogen specifically, neither input exists yet in final form. This is the current state of UK regulatory publication as at 25 September 2026, and it should be communicated to internal stakeholders in those terms — a structural fact about where the regime currently stands, not a limitation of available guidance.


5.2 Penalties for Non-Compliance

  • FINDING: HMRC guidance confirms a £500 fixed penalty may apply for failure to retain required CBAM records, and Finance Act 2026 incorporates CBAM into the UK’s existing tax-penalty schedules for notification, registration and return-accuracy failures.

  • SO WHAT: The £500 figure is the only currently quantified UK CBAM penalty; broader exposure for registration or filing failures exists but is not separately quantified in a CBAM-specific schedule.

  • NOW WHAT: Brief risk committees on the general UK tax-penalty framework — not a bespoke CBAM figure — as the applicable standard, and complete this briefing before the accounting period begins on 1 January 2027.


Finance Act 2026’s approach is to fold CBAM penalties into the existing UK tax-penalty architecture rather than create a wholly separate schedule, which means the precise financial exposure for a registration or accuracy failure depends on the general penalty rules applicable to that failure type and the surrounding circumstances, not a single published CBAM number.


5.3 What Cannot Yet Be Calculated — and Why That Matters

  • FINDING: HMRC’s own policy summary, dated 9 September 2026, states: “The details in this document may therefore be subject to change; updates will be reflected in this document.”

  • SO WHAT: Even HMRC’s most current published guidance is explicitly provisional, meaning a compliance programme built solely around today’s detail is exposed to rework the moment that detail changes.

  • NOW WHAT: Build the internal compliance control system in Section 7 around the data-collection process, not around today’s unpublished numbers, and have that process operational before 1 January 2027 so it absorbs the autumn 2026 guidance update without disruption.


This is a central finding of this analysis, not a caveat appended to it. The strongest compliance posture available to a UK hydrogen importer today is not a forecast of what the rate or default value will be — no such forecast can be defended — but a control system built to function whatever those figures turn out to be.


5.4 EU Benchmark: Certificate Prices and Free Allocation

  • FINDING: The EU CBAM certificate price stood at €75.28/tCO₂ for Q2 2026, published 6 July 2026, with Q3 2026 pricing scheduled for publication on 5 October 2026, and the EU ETS free-allocation factor applied against the CBAM charge falls from 97.5% in 2026 to 95% in 2027.

  • SO WHAT: EU pricing trends are directionally informative for cost-planning conversations involving parallel EU exposure, but they carry no status whatsoever as a UK CBAM proxy.

  • NOW WHAT: Where an EU-derived figure is used in any internal cost discussion, label it explicitly as an EU benchmark — never as a UK estimate — in every document from 1 January 2027 onward.


From 2027, EU CBAM certificate prices move from quarterly to weekly publication, a frequency change that has no equivalent under the UK’s sectoral-price mechanism. This is a further structural divergence importers should note when building any dual UK/EU compliance reporting template.


6. Sector-Specific Impact Analysis


6.1 Hydrogen Production Routes and System Boundaries

  • FINDING: HMRC’s System Boundaries Document, version 1.00, was published on 13 July 2026 and establishes the production routes and processes relevant to determining which hydrogen production emissions are attributed to a UK CBAM good.

  • SO WHAT: Suppliers must be asked for emissions data mapped specifically to the UK’s boundary definition, not a generic carbon-footprint figure, or the data received will not be usable in a UK return.

  • NOW WHAT: Include the UK system-boundary scope explicitly in every supplier data request template from the outset, so that data collected from 1 January 2027 is UK-CBAM-compatible from the first shipment.


The System Boundaries Document confirms that HMRC has defined which hydrogen production processes and associated emissions fall within the UK CBAM calculation. Beyond confirming the document’s existence, version and publication date, the detailed technical content of the boundary methodology — precisely which process-level emissions are included or excluded for specific hydrogen production routes — is not set out in the guidance available as at 25 September 2026 in sufficient detail to state further here without risk of inaccuracy; this is addressed in the Research Limitations statement in Section 10, and a Compliance Manager needing that process-level detail should consult the primary System Boundaries Document directly.


6.2 Third-Country Exporter Readiness: What the Evidence Shows

  • FINDING: An EU Delegation/ITC-QazTrade assessment published in June 2026 found that Kazakhstan exported more than €600 million of steel and aluminium to the EU, with estimated annual CBAM exposure of approximately €100–114 million for key product categories under the study’s methodology.

  • SO WHAT: Third-country exporters with materially more CBAM experience than the UK’s hydrogen sector are already restructuring their emissions-data and reporting systems in response to comparable financial exposure.

  • NOW WHAT: Use the Kazakhstan case as the internal business case for beginning supplier engagement now, well ahead of the UK’s 1 January 2027 commencement date, rather than waiting for the accounting period to start.


Nurlan Kulbatyrov, Deputy Director General of QazTrade, stated on 3 June 2026:

“We have already begun systematic adaptation of industrial exporters to the new requirements of the European Union.”

This is not a hydrogen-specific case — it concerns steel and aluminium exposure to EU CBAM — but it is the clearest available evidence of how quickly and materially a comparable carbon border mechanism can translate into exporter-side operational change once exposure is understood. Indian steel and aluminium producers illustrate a related, though less quantified, pattern of exposure. Tata Steel’s FY2025–26 Integrated Report identifies EU CBAM as a regulatory pressure affecting the global steel industry and records 22.53 million tonnes of India deliveries in that year; JSW Steel’s annual report material discusses EU CBAM and identifies Italy, Belgium and Spain among its export destinations; Hindalco’s FY2025–26 results report 1.34 million tonnes of upstream aluminium capacity and consolidated revenue of ₹274,944 crore.


None of these three companies’ EU-destined export tonnage or company-specific CBAM liability is disclosed in the sources reviewed for this report, and no such figure should be inferred, estimated, or implied from the production and revenue data that is disclosed. These three companies are documented as potentially affected exporters, not as companies with a quantified CBAM liability.


7. Practical Action Framework


7.1 Supplier Data Readiness Protocol

  • FINDING: HMRC guidance confirms that actual emissions data must be obtained from the producer and independently verified under S.I. 2026/995, but does not itself set out the sequence of information an importer should request from an overseas hydrogen producer.

  • SO WHAT: Without a structured data request, an overseas producer will not spontaneously supply information in a form compatible with UK CBAM’s verification and attribution requirements.

  • NOW WHAT: Issue the supplier data request checklist below to every hydrogen producer before the first 2027 shipment is booked, and complete this for all existing suppliers by 31 December 2026.


Table: Supplier Data Readiness Checklist

Data item

What it establishes

Acceptable evidence

Installation identification

Which production facility the hydrogen originates from

Facility name, address, registration/licence reference

Production route

Which production process applies (affects emissions attribution)

Producer’s own process documentation

Monitoring period

The timeframe the emissions data covers

Dated monitoring records aligned to shipment period

Emissions intensity

The embodied emissions figure per unit of hydrogen

Producer-calculated figure, pending verification

Methodology

How the emissions intensity was calculated

Reference to the calculation methodology applied

Verifier identity

Who independently verified the data

Named verifier and accreditation reference

Verification evidence

Proof that verification (not self-assertion) occurred

Verification report or good-specific verification summary

Carbon-price documentation

Evidence of any carbon price already paid in the country of production

Scheme name, payment evidence, applicable period

7.2 Emissions Data Decision Tree: Actual vs Default

  • FINDING: HMRC requires the use of a default emissions value where actual data is unavailable or lacks verification evidence, but the UK hydrogen default emissions value itself is not yet published under Schedule 17, paragraph 11, and S.I. 2026/995, regulation 4, as at 25 September 2026.

  • SO WHAT: The decision structure between actual and default data can be built now, but its default-value branch cannot be completed with a working figure until HMRC publishes one.

  • NOW WHAT: Deploy the decision tree below with the default-value branch explicitly marked pending, and update it the moment HMRC publishes — do not wait for that publication before the rest of the framework goes live on 1 January 2027.


Decision tree: - Actual emissions data received from producer, and independently verified → use actual data in the CBAM return. - Actual emissions data unavailable, or available but not independently verified → default emissions value must be used

— UK hydrogen default value not yet published as at 25 September 2026; pending HMRC publication.


7.3 Carbon Price Relief Evidence Checklist

  • FINDING: S.I. 2026/809 permits an importer to claim carbon price relief where embedded emissions have already been subject to a qualifying carbon-pricing scheme, and HMRC’s qualifying-scheme list — published 27 August 2026 and explicitly provisional — currently includes the EU ETS, China’s ETS, India’s Carbon Credit Trading Scheme, Japan’s GX-ETS, Korea’s ETS and Australia’s Safeguard Mechanism.

  • SO WHAT: A relief claim is only as strong as the supplier evidence trail behind it, and because the qualifying-scheme list itself can change, a claim built on today’s list may need re-evidencing before filing.

  • NOW WHAT: Build carbon-price evidence requirements into supplier contracts immediately, and re-check the current qualifying-scheme list immediately before every return is filed, starting with the return due 31 May 2028.


For a hydrogen importer, this makes supplier carbon-price documentation a material compliance-control issue in its own right, not an optional supporting document. The evidence required — scheme name, payment amount, applicable period, and independent verification — must be obtained from the producer as part of the same engagement that secures emissions-intensity data, not sought separately after the fact.


7.4 Internal Control Matrix: RACI for CBAM Readiness

  • FINDING: No equivalent internal-ownership framework for UK CBAM hydrogen compliance is present in currently published HMRC or independent guidance as at 25 September 2026 — the obligations exist, but responsibility allocation across functions is left to each importer to design.

  • SO WHAT: Without assigned internal ownership, CBAM data collection defaults to no single function, and gaps in supplier data, verification evidence or record-keeping surface only when the return is due — by which point they cannot be corrected retrospectively.

  • NOW WHAT: Assign named owners against every requirement row in the matrix below, with assignments complete before 31 December 2026.


Table: 2027 Compliance Control Matrix

Requirement

Owner

Data required

Supplier responsibility

Internal evidence

Deadline

Failure consequence

Threshold monitoring

Compliance

Import value, rolling 30-day and 12-month

None

Internal tracking log

Continuous from 1 Jan 2027

Late/missed registration

Supplier data request

Procurement/Compliance

Installation, route, monitoring period

Full disclosure

Signed data request record

Before first 2027 shipment

Unusable/incomplete emissions data

Emissions verification

Sustainability/Compliance

Verified emissions intensity

Producer + verifier engagement

Verification report

Before return filed

Cannot use actual data; falls to default (pending)

Carbon price relief evidence

Compliance/Finance

Scheme, payment, period

Documentary evidence

Retained evidence file

Before return filed

Relief claim unsupported

Record retention

Compliance

Verification reports/summaries

N/A

Six-year retention system

From date of receipt

£500 fixed penalty

Return filing

Finance/Compliance

Commodity code, weight, relief, origin

N/A

Completed return

31 May 2028

Filing/accuracy penalty exposure


7.5 Worked Example: A UK Hydrogen Importer Walkthrough

  • FINDING: This walkthrough uses only confirmed UK CBAM inputs — commodity code 2804 10, the £50,000 threshold tests, the S.I. 2026/802 return fields, and the six-year retention rule — alongside clearly labelled illustrative figures where no official UK number yet exists.

  • SO WHAT: A worked walkthrough exposes precisely where real, citable regulatory data is available today and where an importer must currently substitute a placeholder pending HMRC publication.

  • NOW WHAT: Copy this walkthrough’s structure directly into your own first 2027 shipment file, and complete steps 1–3 before the shipment is booked, well ahead of 1 January 2027.


Scenario: A UK-based industrial gas importer plans to bring in a shipment of liquid hydrogen under commodity code 2804 10 from an overseas producer, with a Q1 2027 delivery date, at a shipment value placing the importer close to the £50,000 forward-looking threshold.


  • Step 1 — Scope check (sourced). 

    The importer confirms the shipment is classified under commodity code 2804 10, matching HMRC’s confirmed hydrogen scope. Result: in scope.

  • Step 2 — Registration threshold test (sourced). 

    The importer applies the forward-looking test: is £50,000 or more of CBAM-liable hydrogen expected within the next 30 days? Illustrative shipment value used for this example: £62,000. This is an assumed figure for demonstration purposes only and is not drawn from any confirmed case. Against the confirmed £50,000 threshold, this illustrative shipment would trigger the forward-looking test.

  • Step 3 — Supplier data request (sourced obligation). 

    Before the shipment is booked, the importer issues the Section 7.1 checklist to the overseas producer: installation identity, production route, monitoring period, emissions intensity, methodology, verifier identity, verification evidence, and carbon-price documentation.

  • Step 4 — Emissions data decision (sourced logic; no sourced figure). 

    If the producer returns independently verified actual emissions data, that data is used. Illustrative emissions intensity used for this example only, if actual data were unavailable: 9.5 tCO₂e/tonne. This figure is illustrative only — no official UK hydrogen default emissions value is published as of 25 September 2026, and this number must not be treated as, or mistaken for, the eventual HMRC default value.

  • Step 5 — Carbon price relief check (sourced mechanism). 

    The importer checks whether the country of production applies a qualifying carbon-pricing scheme from HMRC’s 27 August 2026 list (e.g. the EU ETS or India’s Carbon Credit Trading Scheme) and, if so, requests documentary evidence of the carbon price already paid.

  • Step 6 — Return field population (sourced). 

    The importer prepares the return fields required under S.I. 2026/802, reg. 10: commodity code (2804 10), weight, any carbon price relief claimed, and place of origin.

  • Step 7 — Record retention (sourced). 

    The verification report or good-specific verification summary is filed under a six-year retention rule beginning from its receipt date, per S.I. 2026/995, reg. 16.


Sourced figures used: commodity code 2804 10; £50,000 threshold; S.I. 2026/802 return fields; six-year retention (S.I. 2026/995, reg. 16); qualifying carbon-pricing scheme mechanism (S.I. 2026/809). Illustrative figures used: shipment value of £62,000; emissions intensity of 9.5 tCO₂e/tonne. Both are labelled Illustrative and are not official HMRC figures.

This walkthrough deliberately stops at Step 7 of the sequence above. It does not calculate a resulting CBAM charge in pounds, because no defensible UK hydrogen CBAM rate or default emissions value exists as at 25 September 2026 to complete that calculation with.


8. Strategic Outlook


8.1 What Happens Next: The Autumn 2026 Guidance Wave

  • FINDING: HMRC has stated that further guidance is expected during autumn 2026, with webinars planned for October 2026, covering default values, rates, and monitoring and verification detail not yet finalised as at 25 September 2026.

  • SO WHAT: Several of the data gaps identified throughout this report have a defined, if not exact, resolution window rather than an indefinite one.

  • NOW WHAT: Diarise HMRC’s October 2026 webinars now, and treat their content as the trigger for reviewing every section of this report flagged as pending.


The guidance wave expected this autumn is the single most consequential near-term event for a UK hydrogen importer’s compliance planning, because it is expected to resolve the default emissions value, the illustrative 2027 rate, and further monitoring and verification methodology — the three inputs this report has consistently identified as unpublished.


8.2 The 2027–2028 Horizon: Registration, First Return and Beyond

  • FINDING: The confirmed UK CBAM date sequence runs 1 January 2027 (CBAM commencement and threshold tests begin) → 31 January 2028 (registration deadline for 2027 triggers) → 1 January 2028 (registration service opens) → 31 May 2028 (first return and payment due).

  • SO WHAT: The compliance burden is front-loaded into 2027 — data collection, supplier engagement, and threshold monitoring all begin then — even though the registration service and the filing deadline itself do not arrive until 2028.

  • NOW WHAT: Do not treat the 2028 filing dates as grounds to delay 2027 data-collection work; that work must be operational from 1 January 2027, regardless of when the return is actually due.


Beyond the UK’s own calendar, EU CBAM’s parallel shift to weekly certificate pricing from 2027 (Section 5.4) is a further signal of how quickly a carbon border mechanism can move from a settled legal framework to an operationally demanding one — a trajectory UK CBAM is following on its own, later timeline. For a UK hydrogen importer, the single action that determines whether the first return is defensible is not filed in 2028 — it is the supplier engagement, emissions verification and internal ownership assigned before 1 January 2027.


9. FAQ Section


Is hydrogen actually in scope for UK CBAM, and how do I check? 

Hydrogen is in scope for UK CBAM under commodity code 2804 10, confirmed by HMRC’s hydrogen scope guidance. Check your import documentation against this code directly; scope determination is a commodity-code exercise, not a judgement call.


When exactly do I cross the £50,000 UK CBAM registration threshold for hydrogen imports? 

Two tests apply from 1 January 2027: a forward-looking test triggered by £50,000 or more of expected CBAM imports within the next 30 days, and a backward-looking test triggered by £50,000 or more imported within the previous 12 months. Whichever test you trigger first determines when your registration obligation begins.


What must I request from my overseas hydrogen producer before my first 2027 shipment? 

Request installation identity, production route, monitoring period, emissions intensity, calculation methodology, verifier identity, verification evidence, and carbon-price documentation. UK CBAM requires this data to be independently verified, not self-asserted by the producer.


What happens if my hydrogen supplier cannot provide verified actual emissions data? 

HMRC requires use of a default emissions value where actual data is unavailable or unverified. The UK hydrogen default emissions value has not yet been published as of 25 September 2026, so this decision branch currently cannot be completed with a working figure.


Can carbon pricing my supplier has already paid reduce my UK CBAM liability, and what evidence do I need? 

Carbon price relief is available under S.I. 2026/809 where embedded emissions were already subject to a qualifying carbon-pricing scheme, currently including the EU ETS, China’s ETS, India’s Carbon Credit Trading Scheme, Japan’s GX-ETS, Korea’s ETS and Australia’s Safeguard Mechanism. You need documentary evidence of the scheme, the payment, and independent verification, and this list is provisional and subject to change.


When do I have to register, file my first CBAM return, and make payment? 

Registration liability begins with the threshold tests on 1 January 2027, but the registration service itself does not open until 1 January 2028, with a registration deadline of 31 January 2028 for anyone who triggered registration during 2027. The first CBAM return and payment, covering the full 2027 accounting period, is due 31 May 2028.


10. References and Sources

Research Limitations

This report is based on UK primary legislation and HMRC guidance current to 25 September 2026. The following inputs were not available in final, published form as at that date and are treated throughout as open items, not estimated figures:


• The final UK CBAM default emissions value for hydrogen has not been published; HMRC states it will be published before the regime takes effect in 2027.

• The final UK CBAM sectoral rate for hydrogen for 2027 has not been published; the calculation methodology is established, but the operative figure is not, and an illustrative rate is expected during autumn 2026.

• The final operational methodology and guidance for carbon price relief claims is not yet published in full; the regulatory framework under S.I. 2026/809 is established, but further guidance is expected.

• Detailed monitoring, reporting and verifier-accreditation guidance beyond the core verification requirement in S.I. 2026/995, regulation 12(1), is not yet published; HMRC states further detail is expected before 1 January 2027.

• The full technical content of the UK System Boundaries Document, beyond its confirmed existence, version (1.00) and publication date (13 July 2026), was not available in sufficient published detail to state further in this report.

• No authoritative, sector-specific India-to-EU export tonnage dataset for hydrogen, steel, aluminium, cement or fertiliser was located; the Indian Ministry of Commerce’s total India–EU goods export figure of US$75.85 billion (2024–25) is not a CBAM-sector tonnage dataset and should not be treated as one.

• Company-specific EU-destined export tonnage and CBAM liability for Tata Steel, JSW Steel and Hindalco are not disclosed in any source reviewed for this report; only production, capacity and revenue figures from company reports are confirmed.

• The EU CBAM Q3 2026 certificate price was not published as at 25 September 2026; the European Commission scheduled its publication for 5 October 2026.


Sources Used in This Report


© 2026 Sekason Research Limited. All rights reserved. CBAM Journal is an independent research publication. This article is provided for informational purposes only and does not constitute legal, tax, or regulatory advice. Readers should seek qualified professional advice before taking compliance decisions. Regulatory positions stated are as at 25 September 2026 and subject to change.





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