Leaked EU Draft Would Exempt UK Goods From CBAM From January 2026

British goods could escape the EU Carbon Border Adjustment Mechanism retroactively from January 1, 2026, according to a leaked draft EU-UK summit declaration obtained by Rapporteur ahead of the November 20 summit in Brussels.

The draft reportedly ties the exemption to a formal link between the EU ETS and the UK ETS. If concluded, the linkage would remove carbon-related trade costs between the two markets in both directions. That is the headline. The fine print is that nothing is law yet, and the legal route to a retroactive exemption has not been publicly established.

What does the draft actually propose?

The document, prepared for the November 20 EU-UK summit, reportedly indicates that linking the two carbon markets would allow British goods to avoid the EU's carbon levy — including retrospectively from the start of 2026. That date is not incidental. It is the same day the EU's definitive CBAM regime began operating.

The proposal builds on commitments made at the May 2025 EU-UK summit. In the Common Understanding adopted there, both parties agreed to pursue a formal link between their emissions trading systems, with the intention of enabling mutual exemptions from their respective CBAM regimes.

The European Council authorised negotiations on ETS linkage in November 2025, explicitly identifying reciprocal CBAM exemptions as a potential benefit. The UK government has confirmed that negotiations are underway.

In short: the political track is further along than the legal one.

Who gains, and on which materials?

EU importers purchasing UK-origin steel, aluminium, cement, fertilisers and other CBAM-covered products could avoid carbon border obligations on qualifying goods. British manufacturers would face reduced administrative requirements and, potentially, improved access to European customers.

The reciprocal side matters too. The UK launches its own CBAM in January 2027. Its Finance Act 2026 already provides powers to exclude goods originating in jurisdictions with linked emissions trading systems — a ready-made route to mirror treatment for EU exporters once a linkage agreement exists.

Why the retroactive clause raises eyebrows

The exemption requires changes to EU legislation, subject to approval by both the European Parliament and the Council. Neither has voted.

Article 2(6) of the EU CBAM Regulation sets two conditions for a third country to qualify: a fully linked emissions trading system agreement, and an effective carbon price in that country. The relevant country must also appear in Annex III. The UK currently meets none of these formal tests, because no linkage agreement has been concluded.

The January 2026 start date adds a further complication. The EU's definitive CBAM regime only began operating on that date, and no public legal mechanism exists for applying an exemption backwards to imports already declared under the regime. Retrofitting an exemption onto a system that has been collecting compliance data since day one would be, at minimum, novel.

A retroactive clause with no visible legal mechanism is a promise, not a provision.

What happens at the November 20 summit?

The summit could deliver political clarity. Reuters and the Financial Times have both reported that some elements of the broader EU-UK package may require additional negotiations after the meeting. A declaration is not a statute; it is a signal of intent with a deadline attached.

Until the linking agreement is concluded and the necessary legislation takes effect, companies should continue following existing CBAM reporting and compliance requirements. Any importer banking on the exemption now is trading on a draft.

The reported proposal nonetheless signals a real acceleration in EU-UK carbon-market integration, with consequences extending well beyond the CBAM itself. Two carbon markets once drifting apart now appear to be converging, and at a pace few predicted a year ago.

The milestones to watch are procedural: the linkage agreement text, the Parliament and Council votes, and any UK move on its own exemption powers before January 2027. Until those land, the January 2026 retroactive exemption remains exactly what it is today — a line in a leaked draft.