UK CBAM July Update: What Businesses Know

Status at 16 July 2026 — official, but of mixed authority. The delivery statement was made on 14 July 2026 (Hansard). HMRC guidance was checked on 16 July 2026 and may change. Where the wording differs, legislation prevails.

The July 2026 update gives you a clearer operational picture of UK CBAM, but not a complete one. The ministerial statement sets the direction. The HMRC collections add detail on registration and on carbon price relief. The monitoring, reporting and verification legislation is still to follow.

That split decides which document you can rely on. Use the Finance Act and the made SIs for your legal obligations. Use official guidance to understand HMRC's intended workflow. An example on a guidance page, or an outdated collection page, cannot override legislation.

Default values will be trade-weighted, and the numbers are not published yet

The ministerial statement describes the planned default-value methodology as a trade-weighted average rather than a simple global average. Data from jurisdictions with robust mandatory monitoring, reporting and verification systems, "such as the EU", may be excluded. Additional mark-ups may also be applied (ministerial statement, 14 July 2026).

Specific default values for 2027 are promised for autumn 2026 (ministerial statement, 14 July 2026; the publication itself is not yet available).

Do not put an assumed default value into a budget or a supply contract before that publication appears. Model a range instead, and date every assumption you record. At the same time, ask your suppliers whether verified actual-emissions data may be available. The route you eventually take affects both your cost and the evidence you must hold.

Registration guidance adds workflow, not new law

HMRC's registration material explains the £50,000 forward and backward tests (Schedule 17 and HMRC registration guidance). It also says the registration service is expected to open by 1 January 2028 (HMRC guidance, checked 16 July 2026).

One guidance example is difficult to reconcile with the backward-test timing in Schedule 17. The statutory test applies on the first day of a month and looks back over the preceding 12 months.

Where the two differ, keep the statutory method. Ask HMRC for clarification rather than copying the example into automated logic, because an error built into a threshold calculation repeats on every import line.

Carbon price relief guidance is more operational

The carbon price relief collection sets out the claim workflow, the supporting evidence and the context for HMRC's verification form. It names ISO/IEC 17029, ISO 14064-3, ISO 14065 and ISO 14066, together with accreditation expectations under the relevant international arrangements (HMRC CPR guidance, checked 16 July 2026).

It also gives a practical foreign-exchange convention. Use HMRC's rate for the preceding calendar quarter, and round the result down to two decimal places (HMRC CPR guidance, checked 16 July 2026).

These implementation details come from guidance and notice material. SI 2026/809 delegates the named standards and the FX procedure rather than reproducing them.

Your claims file should therefore capture five things: the payment evidence, the relief or compensation, the currency, the calculation steps, and the version of the guidance you followed.

Two classification points to watch

Current law excludes ferro-silicon code 7202 21, while System Boundaries includes 7202 29. An older policy-summary expression, 7202 2, should not control your classification.

A fertiliser example also appears to place 3101 0000 00 under heading 3102. Do not reproduce that mismatch without clarification (official guidance set, checked 16 July 2026).

Both points affect the commodity code you enter on a customs declaration, so they reach the data you file rather than only your internal reading of the rules.

EU–UK linkage is a negotiation, not an exemption

EU–UK ETS-linkage negotiations were officially described as ongoing on 26 May 2026 (EU General Affairs Council reporting). The political understanding links a future agreement with conditions for reciprocal CBAM exemptions.

No exemption follows automatically from the negotiations themselves. Plan on the rules as they stand.

Turn the update into a dated checklist

Update your internal assumptions on the default methodology, on registration readiness and on carbon price relief evidence.

Where guidance and legislation conflict, log the conflict rather than resolving it informally in a meeting. Re-fetch the HMRC collections before each compliance decision, because these pages change.

Build a dated UK CBAM readiness checklist with three separate columns: law, official guidance, and pending rules. That separation makes each later update faster to apply. It also stops an announced policy from being treated as an operative requirement.

This article uses the official statement and the HMRC collections linked below, together with the official EU Council linkage status referenced in the source outline. Research cutoff: 16 July 2026. Volatile pages require a recheck at publication time.

Source

Source publication: Ministerial delivery statement · HMRC registration collection · HMRC carbon price relief collection · HMRC CBAM collection · EU Council reporting · EU–UK Common Understanding

Source status/class: Official UK statement/guidance and official institutional linkage sources; UK guidance is subordinate to Finance Act 2026 and made secondary legislation.