UK CBAM 2027 Explained: What Manufacturers Need to Know About the UK's Carbon Border Tax
- Jun 27
- 4 min read
From 1 January 2027, the UK Carbon Border Adjustment Mechanism (UK CBAM) will change how many manufacturers, importers and suppliers buy materials from overseas.
Despite the significance of the new legislation, many UK manufacturers are still unaware of how the UK's Carbon Border Adjustment Mechanism (CBAM) works, who it affects and what they should be doing now.
This guide explains UK CBAM in plain English, including the products affected, the £50,000 threshold, what "embedded emissions" means, and the practical steps manufacturers should take before the legislation comes into force.
What is the UK Carbon Border Adjustment Mechanism (CBAM)?
The Carbon Border Adjustment Mechanism (CBAM) is often referred to as a carbon border tax.
Its purpose is to place a carbon price on certain imported goods that have been manufactured overseas, where carbon pricing is lower, or doesn't exist at all.
The UK Government aims to create a more level playing field for UK manufacturers who already face carbon costs through domestic environmental policies.
Without CBAM, imported products produced using higher-carbon manufacturing processes could undercut UK businesses that invest in cleaner production methods.
Put simply:
If imported products have higher embedded carbon emissions, importers may need to pay a carbon charge when those goods enter the UK.
Which Products Will UK CBAM Apply To?
From 1 January 2027, UK CBAM applies to imports within five key sectors:
Aluminium
Cement
Fertiliser
Hydrogen
Iron and steel
The rules may apply whether you import:
Raw materials
Semi-finished products
Components
Finished goods
Even if your business doesn't import directly, suppliers who do may pass these additional costs into your supply chain.
What is the UK CBAM £50,000 Threshold?
Not every importer will fall within the scope of UK CBAM.
The legislation includes a £50,000 rolling 12-month import threshold.
If your total imports of CBAM-covered goods remain below this value, you are generally outside the reporting requirements.
However, businesses should still monitor import values carefully, as crossing the threshold will trigger new compliance obligations.
Why the 2027 Start Date Matters
The UK CBAM becomes effective on 1 January 2027.
The European Union's CBAM is already further ahead, with financial obligations beginning in 2026.
This timing creates an interesting challenge.
While the EU begins charging for carbon-intensive imports, the UK has a one-year gap before its own charging mechanism starts.
Some industry experts believe this could increase the likelihood of higher-carbon imported goods being redirected into the UK market during that period.
For UK manufacturers competing on quality, cost and sustainability, this is something worth monitoring.
What Does "Embedded Emissions" Mean?
One of the biggest differences between CBAM and traditional import duties is that the charge is based on embedded emissions.
Embedded emissions are the greenhouse gases generated during the manufacture of a product before it reaches the UK.
This means businesses may need emissions data from overseas suppliers—not simply invoices or customs values.
Obtaining accurate carbon data could become one of the biggest practical challenges for manufacturers and importers over the next 18 months.
Five Common UK CBAM Myths
"It's an EU regulation. It won't affect UK businesses."
Incorrect.
The UK has introduced its own separate Carbon Border Adjustment Mechanism, which starts in January 2027.
"Only importers need to worry."
Not entirely.
If your suppliers import affected products, increased costs could flow through your supply chain.
"It's just another customs charge."
No.
The charge is linked to the carbon emissions associated with manufacturing, rather than simply the value of imported goods.
"We've got plenty of time."
Collecting emissions information from international suppliers can take months.
Businesses that begin preparing early are likely to face fewer challenges once reporting begins.
"The UK and EU systems are identical."
No.
The UK and EU CBAM schemes have different rules, reporting requirements and implementation timelines.
Businesses trading in both markets may need to comply with both systems separately.
How Manufacturers Can Prepare for UK CBAM
There is no need to panic, but there is value in preparing early.
Here are five practical steps:
1. Review your imports
Identify products that fall within the five CBAM sectors.
2. Check commodity codes
Confirm whether imported products are covered under UK CBAM.
3. Monitor the £50,000 threshold
Track imports over a rolling 12-month period.
4. Speak to overseas suppliers
Ask whether they can provide reliable embedded emissions data.
5. Estimate future costs
Understanding the potential financial impact today makes future budgeting and pricing decisions much easier.
Frequently Asked Questions About UK CBAM
When does UK CBAM start?
The UK Carbon Border Adjustment Mechanism comes into force on 1 January 2027.
Who will pay UK CBAM?
Businesses importing certain aluminium, cement, fertiliser, hydrogen, iron and steel products above the £50,000 threshold may be required to pay the carbon charge.
Does UK CBAM affect manufacturers?
Yes. Manufacturers importing affected products—or buying from suppliers that do—could experience increased costs.
What information will businesses need?
Many businesses will need accurate embedded emissions data from overseas suppliers to calculate their carbon liability.
Final Thoughts
The UK Carbon Border Adjustment Mechanism (CBAM) represents one of the biggest changes to importing carbon-intensive goods into the UK in recent years.
While the new rules don't take effect until January 2027, manufacturers that begin reviewing their imports, engaging with suppliers and understanding their potential exposure today will be in a much stronger position when the legislation arrives.
Rather than viewing UK CBAM as simply another compliance requirement, businesses that prepare early can reduce disruption, improve supply chain visibility and avoid costly surprises.
