UK CBAM vs EU CBAM: what's actually different

If you export to the EU and import into the UK, you are going to touch both carbon border regimes. They are similar in spirit — a tax on the emissions embedded in imported goods — but they differ on almost every practical detail: what's in scope, when you owe money, and what data you have to produce. Here's the short version.

The side-by-side

Practical implications

If you are on both sides of both regimes, three things follow:

1. Your EU customers will ask before HMRC does. They're already in the definitive phase and their reporting started in 2027. You'll see supplier data requests from EU customers long before you have to file anything to HMRC yourself.
2. The data you collect is not directly reusable. The two regimes use the same underlying methodology (the EU CBAM Monitoring & Reporting Regulation) but different reporting formats, different default value tables, and different verification requirements. Data collection is one project; formatting for each regime is another.
3. Ceramics and glass matter here. They're in the UK regime but not the EU regime. If you import Turkish tiles into the UK, that's a UK CBAM problem you won't have seen coming from the EU side.

Common misconceptions

• "We're exempt because we're small." There is no size exemption in either regime. The UK regime has a value threshold; the EU regime effectively has none post-2025. What matters is what you import or export, not how many people you employ.
• "Our customs agent handles this." Freight forwarders and customs agents are excellent at clearing goods. They are not the party responsible for CBAM registration, calculating embedded emissions, or paying the charge — that responsibility sits with the importer of record (you).
• "It's just a report to file." The definitive phase of the EU regime has moved the emphasis firmly onto continuous monitoring, evidence and audit trails (the DRMC framework). The UK regime is being built on similar assumptions.