UK CBAM · From 1 January 2027
UK CBAM arrives 1 January 2027. The XML data requirement comes with it.
The UK Carbon Border Adjustment Mechanism applies from 1 January 2027 to imports of aluminium, cement, fertiliser, hydrogen, and iron and steel. A separate instrument from EU CBAM, a separate filing — the same embedded-emissions data discipline. Carbon Mandate produces the XSD-validated XML the obligation requires.
EU CBAM vs UK CBAM
- Six sectors, including electricity
- Fully operational since 1 January 2026
- Registers and files with the EU Registry
- Five sectors, electricity excluded
- Applies from 1 January 2027
- Registers and files with HMRC
The headline difference: electricity is in scope for EU CBAM but excluded from UK CBAM. Indirect emissions are delayed until 2029 at the earliest under the UK regime.
Who carries the obligation
UK CBAM obligations fall on the UK importer of the relevant goods — usually the person named on the customs declaration, or the person on whose behalf the goods are imported. Importers meeting or exceeding the £50,000 registration threshold over a 12-month period must register with HMRC.
Carbon Mandate prepares the XML evidence. The UK importer registers and files with HMRC themselves.
The same XML architecture
UK CBAM is a new instrument, but the data problem is the one Carbon Mandate already solves: turning unstructured supplier emissions data into schema-valid XML. As HMRC publishes its return format and data schema, the same validation engine, the same preparer-not-filer posture, and the same audit-ready output apply to the UK regime.
See the XML engine live
20 minutes. We validate a real CBAM file in front of you.
No slides. Live validation against your sector.