Before you ship into the EU, make sure your CBAM numbers will survive the definitive regime

For two years, the Carbon Border Adjustment Mechanism asked you for one thing: report. You logged the embedded emissions in your steel, aluminium, cement, fertilisers, hydrogen and electricity, filed a quarterly return, and nobody sent you a bill. That grace period is over. Since 1 January 2026, CBAM has teeth — declarant status, certificates, penalties — and on 14 August 2026 the European Commission published the operating manual for it: a series of ten guidance documents that spell out exactly how the definitive regime works.

Here is the uncomfortable part. Buried in that regime is a single number that decides whether CBAM becomes a routine annual filing or a five- or six-figure line on your P&L. Most importers have not calculated it yet. By the end of this article you will know which number it is, and why getting it wrong is the most expensive mistake you can make in the next twelve months.

What actually changed on 1 January 2026

It helps to be precise about the shift, because the language sounds similar but the consequences are not.

The transitional period (October 2023 to December 2025)

You reported embedded emissions quarterly. There was no financial obligation, no certificate to buy, and no requirement to hold a special status. It was a data-gathering exercise, and the Commission treated errors leniently.

The definitive period (from 1 January 2026)

Three things are now true at once. Only an authorised CBAM declarant may import CBAM goods into the EU. Embedded emissions are declared once a year and must be backed by certificates you have purchased. And if you fall short, there is a penalty. This is no longer a reporting regime — it is a carbon-pricing regime that happens to run through your customs paperwork.

The 14 August guidance, in plain terms

The ten documents are split into four general guides and six sector-specific ones, written — unusually for Brussels — in deliberately non-legislative language. They are aimed squarely at non-EU installation operators, authorised declarants and verifiers, which tells you who the Commission thinks is least ready.

• Guidance 1 introduces the CBAM concepts, the compliance cycle, roles, milestones, deadlines and exemptions.
• Guidance 2 is a quick roadmap for non-EU operators producing CBAM goods.
• Guidance 3 sets out the methods for calculating emissions embedded in goods — the technical heart of the series.
• Guidance 4 explains the free-allocation adjustment: how the number of certificates you must surrender is reduced to mirror the free allowances still given to EU producers.
• Guidance 5a to 5f cover the six sectors individually — cement, hydrogen, fertilisers, iron and steel, aluminium and electricity — with production-process detail and worked examples for each.

If you import in more than one sector, you do not get to pick one guide. You read the relevant sector documents alongside the general four, because the monitoring rules differ by production process.

The obligations you can no longer defer

1. Authorised declarant status

Since 1 January 2026, you cannot import CBAM goods above the threshold without holding authorised CBAM declarant status, granted by the national competent authority in your country of establishment through the Authorisation Management Module. Importers who filed their application by 31 March 2026 were allowed to keep importing provisionally while a decision was pending. If you did not, and you are over the threshold, every consignment since then is exposed.

2. The 50-tonne threshold — and the trap inside it

The Omnibus simplification replaced the old €150-per-consignment exemption with a single mass-based threshold: 50 tonnes of CBAM goods per importer per calendar year, measured as cumulative net mass across iron and steel, aluminium, fertilisers and cement. Electricity and hydrogen are not covered by the exemption. This change exempts roughly 182,000 mostly small importers while still capturing over 99% of in-scope emissions.

The trap is in the word cumulative. The moment your running annual total crosses 50 tonnes, every tonne you imported that year — including everything below the threshold — becomes subject to full CBAM obligations. There is no partial relief. If you sit anywhere near 50 tonnes, you must apply for declarant status before you cross it, not after.

3. Embedded emissions: default values or actual data

You may declare embedded emissions using either the Commission's default values or your suppliers' actual verified emissions. This choice is the number that matters, and it is where the next section lives.

4. The certificate bill

The price of a CBAM certificate tracks the weighted average of EU ETS auction clearing prices. In 2026 the Commission publishes four quarterly prices; the first two came in at €75.36 (Q1) and €75.28 (Q2) per tonne of CO2. From 2027 the price is published weekly, and from February 2027 you begin buying certificates for both your 2026 and 2027 imports. From 2027 onward you must also hold, each quarter, certificates covering at least 50% of the emissions embedded in what you have imported since the start of the year.

5. The deadlines that carry penalties

Your first annual CBAM declaration for the 2026 import year is due by 30 September 2027, and you must surrender the matching certificates by the same date. Miss it, and the penalty is €100 per tonne of CO2 equivalent left uncovered — index-linked, and rising. Paying the penalty does not release you from surrendering the certificates anyway, and repeated breaches can cost you your declarant authorisation entirely.

The number most importers get wrong

Here is the promised answer. The single most consequential figure in your CBAM file is not the certificate price — it is whether your embedded emissions are declared on default values or on actual verified data.

Default values are deliberately conservative. They are designed so that using them is never cheaper than measuring the real thing, because the whole point is to reward accurate data. Actual verified emissions almost always come out lower for a well-run installation — but they require your non-EU suppliers to monitor emissions to the CBAM methodology, communicate them through the electronic template the Commission provides, and have them verified. That is a supply-chain data project, not a spreadsheet, and it is exactly what Guidance 3 and the sector guides were published to enable.

Basis of declaration, what it costs you , and what it requires:

• Default values: Higher certificate bill; conservative by design
  
  • Nothing from suppliers — but you pay for the caution
• Actual verified emissions: Typically lower, and defensible
  
  • Supplier monitoring, the Commission's data template, and third-party verification

The importers who will be blindsided in 2027 are the ones who assumed they could switch to actual data at declaration time. You cannot flip that switch late, and it helps to be precise about why. Verification itself happens after the year closes: the reporting period is the full calendar year, so 2026 emissions can only be verified from 2027, by an EU-accredited CBAM verifier — and the first accreditations are only expected around September 2026. But verification only confirms what was already measured; it cannot invent data. If your suppliers were not running a compliant monitoring system at the installation throughout 2026, there is nothing for an accredited verifier to sign off, and your 2026 declaration defaults to the expensive number. The monitoring has to be live during the year; the verification comes after. If that conversation with your suppliers has not started, it is already late.

The timeline you are actually working to

• 1 January 2026: Definitive regime begins; declarant status, certificates and penalties apply
• Throughout 2026: Capture supplier emissions data; quarterly certificate prices published
• 1 February 2027: Certificate sales open; you begin buying for 2026 and 2027 imports
• During 2027: Hold at least 50% of running-year embedded emissions in certificates each quarter
• 30 September 2027: First annual CBAM declaration and certificate surrender for the 2026 year
• 2026 to 2033: CBAM obligation phases in as EU ETS free allocation phases out
• From 2034100% of embedded emissions covered; no free allocation for CBAM goods

What to do in the next 90 days

1. Confirm your position against the 50-tonne threshold across all four mass-based sectors combined, and check you hold authorised declarant status if you are over or near it.
2. Map every CBAM good you import to its sector guide (5a to 5f) and read the general guides 1, 3 and 4.
3. Decide, supplier by supplier, whether you will declare on default values or pursue actual verified data — and start the supplier conversations now, because 2026 data cannot be recreated later.
4. Model your certificate exposure at current prices so the 2027 cash requirement is not a surprise to your CFO.
5. Build the evidence file — supplier data, the Commission template, verification — that will make your September 2027 declaration defensible.

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