HMRC has published fresh Carbon Border Adjustment Mechanism, or CBAM, communications materials today, and while the new pack is aimed at trade bodies and industry groups, the message for small firms is clear. If your business imports certain goods into the UK, or buys from suppliers that do, this is the time to work out whether the new rules could affect you before they start on 1 January 2027.
CBAM is designed to put a carbon price on some imported goods so overseas products do not gain an unfair advantage over UK producers already facing carbon costs. The government says the measure will apply to imports in five sectors: aluminium, cement, fertiliser, hydrogen, and iron and steel.
That may sound like a niche policy, but plenty of smaller firms could end up inside the frame. Engineering workshops, metal fabricators, builders’ merchants, specialist wholesalers, manufacturers buying overseas inputs, and some construction suppliers may all need to pay attention. Even if you are not the named importer, you may still feel the knock-on effect through higher admin, new supplier questions, revised prices, or contract changes.
The new HMRC pack matters because it is not just another technical update buried on GOV.UK. It is specifically designed to help trade associations, representative bodies and other organisations pass accurate information through their networks. In other words, government wants businesses in affected supply chains to start preparing early, not leave it all to the final few months of 2026.
The official materials say businesses should use the pack to inform members, customers and supply chains about the changes coming in from 1 January 2027. HMRC also says proactive communication should help firms stay compliant and reduce the risk of penalties or business interruption. That is the part small businesses should focus on. This is not only about tax policy in the abstract. It is about avoiding disruption to buying, importing and pricing decisions later on.
For smaller firms, the practical issue is often not the headline policy but the hidden workload behind it. You may need to confirm which products are actually in scope, check who the importer of record is, ask suppliers for more information, and make sure your finance and customs processes match the final rules. If your business relies on imported steel parts, aluminium products or cement-related goods, those checks can take longer than expected, especially when suppliers are overseas and data is patchy.
There is also a threshold to keep in mind. According to the government’s CBAM collection page, the measure comes into force from 1 January 2027, and HMRC is already encouraging affected networks to prepare. That means businesses which currently assume they are too small to worry may want to look again, particularly if they import specialist goods in smaller volumes but at relatively high values.
So what should an owner-manager do now? Start with a short review rather than a major project. First, list any imported products you buy or sell that could fall into the five covered sectors. Second, check whether your business is the importer named on customs paperwork, or whether that responsibility sits elsewhere in the chain. Third, ask key suppliers what emissions or product information they expect to be able to provide as the regime gets closer. Fourth, make sure one person in the business owns the issue, even if it only takes a few hours a month for now.
There is a wider cost angle too. Many SMEs are already dealing with tight margins, expensive borrowing and unpredictable input prices. If CBAM adds extra reporting, professional advice costs or sourcing changes, the pressure will land fastest on firms that leave preparation too late. Businesses that start mapping the issue now should have more room to negotiate with suppliers, update pricing and avoid last-minute surprises.
The good news is that there is still time. HMRC’s update is a prompt, not a penalty notice. But it is a useful signal that the government expects businesses in the affected sectors to begin getting organised well ahead of 2027. For small firms importing carbon-intensive goods, or buying from those who do, this is a sensible week to ask a simple question: are we sure this will not affect us?
Sources: HMRC, Carbon Border Adjustment Mechanism (CBAM) communications resources, published 9 April 2026; GOV.UK CBAM collection page.
