UK CBAM guidance arrives: registration, records, relief and penalties
The UK CBAM has moved fromconsultation to instruction. In mid-July HMRC published a package of guidancebuilt on the framework now settled in the Finance Act 2026, alongside anupdated policy summary. For importers of aluminium, cement, fertilisers, hydrogen,iron and steel, this is the material to work from between now and 1 January2027.
What the package contains
Four pieces matter most. First,guidance on registering for the scheme, including how to track the £50,000registration threshold, which is measured against the value of CBAM goodsimported over a rolling twelve-month period. Second, guidance on record-keeping:records supporting CBAM returns must be kept for six years, and the guidancesets out the penalties for getting this wrong. Third, step-by-step guidance onclaiming carbon price relief, the mechanism that reduces UK CBAM liabilitywhere a carbon price has already been paid overseas. Fourth, published a fewdays earlier, drafts of the Force of Law Notice, the System Boundaries documentand a Carbon Pricing Verification Form, which together carry much of thetechnical detail of how emissions and overseas carbon prices will be evidenced.
What it tells us
The shape of the scheme is nowfirm. The UK CBAM is a tax, with returns and payments rather than certificates.The £50,000 threshold keeps the smallest importers out. Relief for overseascarbon pricing will be real but evidenced, which means paperwork fromsuppliers, not assertions. And the six-year record-keeping requirement, backedby penalties, signals that HMRC intends to audit this tax like any other.
Some detail is still to come.Further material on monitoring and reporting requirements and on themethodology for default emissions values is expected later in 2026. Thosedefaults matter, because importers without actual data from their supplierswill fall back on them.
What importers should do now
Work out whether you will crossthe registration threshold, and map which of your products fall within thecommodity codes in scope. Read the draft System Boundaries document againstyour own supply chain. Start the conversation with overseas suppliers aboutemissions data and carbon price evidence, because both take time to produce andthe relief claim will need the verification form completed properly. And briefyour finance team: transitional easements extend the first deadlines forregistration, returns and payment, but the liability itself accrues from dayone.
The pattern from the EU schemeis clear. The businesses that struggled were the ones that waited for everyrule to be final before acting. The rules are now final enough to start.
CBAM-Assured provides UK CBAMtraining and helps importers build the supplier data and evidence they willneed from January. Contact us to get ready.