UK CBAM Starts in January 2027: What Affected Businesses Should Prepare Now

From 1 January 2027, the UK Carbon Border Adjustment Mechanism (CBAM) places a carbon price on imports of certain carbon-intensive goods into the United Kingdom. If your business imports — or supplies products made from — aluminium, cement, fertiliser, hydrogen, iron or steel, the clock is already running.

What UK CBAM is

UK CBAM is designed to address carbon leakage: the risk that emissions simply move abroad as domestic carbon pricing tightens. It applies a charge to the embodied emissions of imported goods in the covered sectors, so that imports face a comparable carbon cost to goods produced under the UK Emissions Trading Scheme. Unlike the EU's version, the UK mechanism is structured as a tax administered by HMRC rather than a certificate-trading system.

Who is affected

• Importers of covered goods in the aluminium, cement, fertiliser, hydrogen, iron and steel sectors.
• UK manufacturers whose supply chains include imported precursors in those sectors — the carbon cost will appear in purchase prices.
• Exporters to the EU, who already face EU CBAM: its definitive regime began in January 2026, and evidence of actual embodied emissions directly affects what customers pay.

Why measured data matters

Border carbon mechanisms price embodied emissions. When actual, verifiable emissions data is not available, default values apply — and defaults are set conservatively, which usually means a higher charge than a well-run operation would pay on its real numbers. The businesses that can evidence measured, asset-level emissions per tonne of product will pay for what they actually emitted, not for a pessimistic assumption.

That evidence cannot be assembled retrospectively from utility bills. It requires knowing which processes consumed which energy, when, and against which emission factors — with an audit trail. This is measurement infrastructure, and it takes months, not weeks, to baseline properly.

A sensible preparation timeline

• Now: map your exposure — which imported or exported goods fall in covered sectors, and what share of cost they represent.
• Within six months: put continuous energy and carbon measurement in place at the sites that make or process covered goods, and start building a baseline.
• During 2026: run at least two full reporting cycles internally, so data quality issues surface before they matter.
• January 2027: enter the regime with a year of measured, auditable data behind you.

CarbonMeter automates this workflow — asset-level measurement, verified emission factors, and auditor-ready reporting — from £500 per month. If you would like to understand your CBAM exposure, get in touch.