CBAM GUIDE

CBAM Compliance Guide

The Carbon Border Adjustment Mechanism (CBAM) is the European Union framework that prices the carbon emissions embedded in imported goods. This guide sets out what CBAM is, how the transitional period differs from the definitive regime, how embedded emissions are calculated and verified, the deadlines and phase-in costs, the six covered goods and their combined nomenclature codes, and the questions exporters and EU importers ask most.

Updated 2026 · about 8 min read · Regulation (EU) 2023/956

Editorial illustration of the EU Carbon Border Adjustment Mechanism: a faceless dock worker and an EU customs officer stand at a port border on either side of a cargo container glowing with amber light, with a container ship at sea, the European Union ring of twelve stars, and an industrial skyline.
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Key facts at a glance

The definitive CBAM regime has applied since 1 January 2026, covering six product groups under Regulation (EU) 2023/956.

Live since 1 Jan 2026Definitive regime
Six product groupsCovered goods
Regulation (EU) 2023/956Legal basis
50 t per importer a yearDe minimis threshold
10 / 20 / 30 percentDefault value markup
2.5 percentPayable share in 2026

What CBAM is

The Carbon Border Adjustment Mechanism (CBAM) is the European Union framework that prices the carbon emissions embedded in imported goods, so the climate ambition of European industry is not undercut by carbon leakage.

Transitional periodOct 2023 – Dec 2025 · quarterly reports onlyDefinitive regimefrom 1 Jan 2026 · verify, declare, surrender1 JAN 2026regime changeFinancial obligationFinancial obligationVerification mandateVerification mandateCBAM certificatesCBAM certificatesAuthorised declarantAuthorised declarantPeriodic reportingPeriodic reportingTHE DEFINITIVE OBLIGATION, IN SEQUENCEVerifyDeclareSurrender
Two CBAM states. The transitional period required quarterly reports only; the definitive regime requires verified emissions, an annual declaration and surrendered certificates.

The Carbon Border Adjustment Mechanism (CBAM), sometimes referred to as a carbon border tax, is the European Union framework that prices the carbon emissions embedded in imported goods. CBAM is not a tax in the legal sense; it operates as a certificate obligation tied to the EU Emissions Trading System rather than a customs duty.

Its purpose is to put a carbon cost on imports equivalent to the cost that production inside the European Union carries under the EU Emissions Trading System (EU ETS), so that the climate ambition of European industry is not undercut by carbon leakage to regions with weaker carbon pricing. Transitional reporting ran from October 2023 to December 2025, and the definitive regime has applied since 1 January 2026. CBAM covers six product groups: cement, iron and steel, aluminium, fertilisers, electricity and hydrogen, listed by combined nomenclature code in Annex I of Regulation (EU) 2023/956.

The transitional period and the definitive regime differ in kind, not only in degree.

  • Transitional period (Oct 2023 to Dec 2025). Quarterly reports on embedded emissions, with no financial obligation, no verification mandate and no certificates.
  • Definitive regime (since 1 Jan 2026). Covered goods enter the European Union only through an authorised CBAM declarant, embedded emissions must be verified, an annual declaration is filed, and CBAM certificates are surrendered against a payable share of those emissions, priced off the EU ETS.
  • Omnibus I de minimis. Regulation (EU) 2025/2083 introduced a threshold of 50 tonnes per importer each year for cement, iron and steel, aluminium and fertilisers; electricity and hydrogen are excluded from that exemption.
  • Coverage despite the threshold. Around 90 percent of importers fall below the threshold, yet close to 99 percent of embedded emissions remain covered, so material exporters are still affected.

An installation in India may register voluntarily in the CBAM registry through the operator module and share its verified embedded emissions data centrally, so the European importer or authorised declarant can rely on it. EU ETS free allocation phases out between 2026 and 2034, and CBAM covers 100 percent of embedded emissions by 2034. The lean overview and the conversion path sit on the CBAM solutions page; this guide holds the detail.

How the Carbon Border Adjustment Mechanism works

Under CBAM, embedded emissions are measured at the installation, verified and shared through the central CBAM registry, then declared at the European border by an authorised declarant who surrenders certificates priced off the EU ETS.

EXPORTING COUNTRYEUROPEAN UNIONEU BORDER1InstallationIndia, covered good2Embedded emissionsmeasured or default3Verified, sharedCBAM registry4Border declarantreports the year5Certificatessurrendered, off EU ETSless carbon price paid at origin
The CBAM border mechanism follows embedded emissions from the Indian installation across the European border to the certificate that is surrendered.
  1. Installation · IndiaAn Indian installation produces a covered good: cement, iron and steel, aluminium, fertilisers, electricity or hydrogen.
  2. Embedded emissionsThe emissions embedded in the good are measured from installation data, or estimated using default values that carry a regulatory markup.
  3. Verified and sharedAn accredited verifier confirms the data, which is shared with the European importer through the central CBAM registry.
  4. Border · declarantThe good crosses the European border, where an authorised CBAM declarant reports the embedded emissions for the year.
  5. Certificates surrenderedCBAM certificates are surrendered for the embedded emissions, priced off the EU ETS, with any carbon price already paid at origin deducted.

A carbon price paid in the country of origin is deductible where the European Union recognises it.

Calculating embedded emissions (MRV)

Embedded emissions under CBAM are determined through monitoring, reporting and verification (MRV): the direct embedded emissions of a covered good are determined using either a calculation-based approach or a measurement-based approach, and the calculation-based approach includes a mass-balance method.

Embedded emissions under CBAM are determined through the monitoring, reporting and verification methods set out in the EU rules. These are the official terms, set out in Implementing Regulation (EU) 2025/2547 with the framework methodology in Annex IV of Regulation (EU) 2023/956. The direct and indirect emission categories behind this work sit within the wider greenhouse gas scopes set out on the carbon footprint solutions page, where Scope 1, Scope 2 and Scope 3 emissions are explained in full.

Activity datafuels · materialselectricity · process×Factorsemission + calculationdefault markup 10/20/30%=tCO₂eembeddedMASS-BALANCE METHOD · CARBON-BEARING INPUTS RECONCILED AGAINST OUTPUTScarbon INfuels, feedstockcarbon OUTproduct + emissionsbalance → tCO₂e
Activity data multiplied by emission and calculation factors, with a mass-balance method on carbon-bearing inputs and outputs.
How emissions are determined
Activity data multiplied by emission and calculation factors. Includes a mass-balance method for carbon-bearing inputs and outputs.
Typical fit
Most installations producing cement, iron and steel, aluminium and fertilisers, where fuel and material data are well recorded.
Default values
Default values published by the European Commission could substitute for actual data only until 31 July 2024.
Actual data since 1 Aug 2024
Required from 1 August 2024, with a limited tolerance allowing up to 20 percent of a complex good's embedded emissions to rely on default or estimated values.
Legal basis
Implementing Regulation (EU) 2025/2547; framework methodology in Annex IV of Regulation (EU) 2023/956.
flue gas flowGHG concentrationflue gas flowcontinuous data logtCO₂emeasured
Continuous emission monitoring of greenhouse gas concentration and flue gas flow in the stack.
How emissions are determined
Continuous emission monitoring of the greenhouse gas concentration and the flue gas flow in the stack.
Typical fit
Installations already running continuous emission monitoring systems on the relevant source streams.
Default values
Not applicable; measured data is the basis throughout.
Actual data since 1 Aug 2024
Required from 1 August 2024; measured values carry the determination.
Legal basis
Implementing Regulation (EU) 2025/2547; framework methodology in Annex IV of Regulation (EU) 2023/956.

Whichever approach applies, the determined emissions are verified and shared so the EU importer or authorised declarant can rely on them. A readiness review fixes the monitoring approach before any data work begins.

Download the CBAM compliance checklist

A one-page branded checklist sets out the six CBAM readiness steps: identify covered goods, map embedded emissions, choose the MRV method, track the key dates, appoint or authorise the declarant, and file the declaration.

  1. Identify covered goods
  2. Map embedded emissions
  3. Choose the MRV method
  4. Track the key dates
  5. Appoint or authorise the declarant
  6. File the declaration

The download link is emailed on submit and the team is notified. The checklist is also reachable directly below.

Download the checklist PDF directly

CBAM Checklist — Lead Magnet

Key dates and phase-in

CBAM phases in between 1 January 2026 and 2034: the definitive regime applies from 1 January 2026, certificate sales open on 1 February 2027, the first annual declaration falls on 30 September 2027, and full coverage is reached in 2034.

The mechanism phases in between 1 January 2026 and 2034. Certificate money moves for the first time in 2027: sales open on 1 February 2027 and the first annual declaration and surrender, covering 2026 imports, falls on 30 September 2027.

202320242025202620272028202920302031203220332034Oct 2023Transitional reporting1 Jan 2026Definitive regime applies31 Mar 2026Authorisation window closed1 Feb 2027Certificate sales open30 Sep 2027First annual declaration2034Full coverage, free allocation endsPAYABLE SHARE OF EMBEDDED EMISSIONS, BY IMPORT YEAR2.5%5%10%22.5%48.5%61%73.5%86%100%
CBAM milestones from the transitional period through to full coverage in 2034.
  1. 1 Oct 2023Transitional period: quarterly CBAM reports on embedded emissions, no financial obligation.
  2. 1 Jan 2026Definitive regime: covered goods enter only through an authorised CBAM declarant, and 2026 imports accrue obligations on a payable share of 2.5 percent.
  3. 31 Mar 2026Authorisation application window closed for uninterrupted importing; pending applicants may continue provisionally.
  4. 1 Feb 2027Certificate sales open on the central platform. Certificates covering 2026 imports are priced on quarterly 2026 EU ETS averages; the standing price is the weekly average from 2027.
  5. 30 Sep 2027First annual CBAM declaration and certificate surrender, covering 2026 imports. The 50 percent quarterly holding requirement runs from 2027.
  6. 1 Jan 2028Proposed application date of the December 2025 downstream extension, around 180 further CN codes. Not adopted.
  7. 2034The payable share reaches 100 percent as EU ETS free allocation ends.
Payable share of embedded emissions by import year
Year 2026 2027 2028 2029 2030 2031 2032 2033 2034
Payable share 2.5% 5% 10% 22.5% 48.5% 61% 73.5% 86% 100%

Certificate exposure on any specific product and volume, on default values against verified data, is estimated year by year in the CBAM cost calculator.

Goods covered and CN codes

CBAM applies to the goods listed in Annex I of Regulation (EU) 2023/956, grouped into six product groups, with coverage following the combined nomenclature (CN) code of each good rather than its trade name.

Coverage follows the combined nomenclature (CN) code of each good rather than its trade name, so the chapters and headings below act as the guide. The product lines name representative goods in each group rather than every covered code.

Cement

CN 2523 · 2507

Cement clinker, white and grey Portland cement, aluminous cement, other hydraulic cements and calcined kaolinic clays.

Within the 50 tonne de minimis

Iron and steel

CN 72 · parts of 73

Pig iron, crude and semi finished steel, flat rolled products, bars and rods, tubes and pipes, screws, bolts and nuts, and steel structures.

Within the 50 tonne de minimis

Aluminium

CN 7601 to 7616

Unwrought aluminium, bars, rods and wire, plates, sheets and strip, foil, tubes and pipes, aluminium structures, containers and stranded wire.

Within the 50 tonne de minimis

Fertilisers

CN 2808 · 2814 · 3102 · parts of 3105

Nitric acid, ammonia, potassium nitrates, urea and other nitrogenous fertilisers, and multi nutrient fertilisers containing nitrogen.

Within the 50 tonne de minimis

Electricity

CN 2716

Electrical energy imported into the European Union.

No de minimis exemption

Hydrogen

CN 2804 10

Hydrogen, a single combined nomenclature code covering the pure product.

No de minimis exemption

A precise check of each product against the Annex I code list is the first step of every CBAM readiness review.

Compliance for Indian exporters

For Indian exporters of covered goods, CBAM compliance turns on measuring the embedded emissions of each product at the installation, verifying that data and sharing it so the EU importer or authorised declarant can file an accurate annual declaration.

For Indian exporters of covered goods, CBAM compliance turns on measuring the embedded emissions of each product at the installation, verifying that data and sharing it so the EU importer or authorised declarant can file an accurate annual declaration. The India and European Union free trade agreement provides no exemption from CBAM, so the discipline below applies to material exporters in each covered group. A first step for any Indian exporter is a structured CBAM discovery brief, after which exposure feeds the CBAM cost calculator.

  • Iron and steel exporters. Coverage spans most of combined nomenclature chapter 72 and listed headings of chapter 73, from pig iron and semi finished steel to flat rolled products, bars, rods, tubes, pipes and finished articles such as screws, bolts and steel structures. Embedded emissions are measured per installation and per production route, then verified for the importer.
  • Aluminium exporters. Coverage runs across CN 7601 to 7616, taking in unwrought aluminium, bars, rods, wire, plates, sheets, strip, foil, tubes, pipes and aluminium structures. Indirect emissions from electricity are significant for aluminium, so installation level energy data carries weight in the determination.
  • Cement producers. Coverage sits under CN 2523 and 2507, covering clinker, white and grey Portland cement, aluminous cement and other hydraulic cements. Process emissions from calcination dominate, so the calculation-based approach with a mass-balance method is the usual route to verified figures.

Fertiliser, electricity and hydrogen exporters follow the same measure, verify and report discipline; electricity and hydrogen sit outside the 50 tonne de minimis and stay in scope at any volume.

CBAM questions, answered in depth

Common questions on CBAM scope, data, certificate pricing, deadlines, penalties and verification, answered for exporters and EU importers.

What are CBAM solutions?

CBAM solutions help exporters of covered goods in India and worldwide, and the EU importers who declare them, comply with the European Union Carbon Border Adjustment Mechanism. The work covers exposure assessment, measurement of embedded emissions, verification, reporting through the CBAM registry and management of certificate obligations under the definitive regime that has applied since 1 January 2026.

Which goods does CBAM cover?

CBAM covers six product groups: cement, iron and steel, aluminium, fertilisers, electricity and hydrogen. A proposal published in December 2025 would extend the mechanism to a wider set of downstream products from 2028, but that extension has not been adopted.

Does the 50 tonne threshold remove the obligation?

The Omnibus simplification introduced a de minimis threshold of 50 tonnes per importer each year for cement, iron and steel, aluminium and fertilisers. Electricity and hydrogen are excluded from this exemption. Around 90 percent of importers fall below the threshold, yet close to 99 percent of embedded emissions remain covered, so material exporters are still affected.

What data does the European importer need from an Indian supplier?

The importer or authorised declarant needs the verified embedded emissions of the goods supplied. An Indian installation can register voluntarily in the CBAM registry and share this verified data centrally, so the declarant can file an accurate annual declaration.

Why use actual data instead of default values?

Default values carry a regulatory markup, so they tend to overstate emissions. Actual verified installation data, confirmed by an accredited verifier, usually produces a lower and more accurate figure, which reduces the certificate obligation that the European importer faces.

How is the CBAM certificate price set?

The price tracks EU ETS auction closing prices: certificates covering 2026 imports are priced on the quarterly average of the quarter of importation, and the standing price from 2027 is the weekly average. The first official price, for the first quarter of 2026, is 75.36 EUR per tonne of CO2e, published by the European Commission on 7 April 2026.

Can a carbon price paid in India be deducted?

A carbon price paid in the country of origin is deductible against the certificate obligation where the European Union recognises it. As of June 2026 India's Carbon Credit Trading Scheme is not yet recognised by the European Union, although the India and European Union trade agreement opens a technical dialogue on carbon price recognition.

What are the key CBAM deadlines?

Importers above the threshold must hold authorised CBAM declarant status; the application window closed on 31 March 2026. Certificate sales begin on 1 February 2027, and the first annual CBAM declaration, covering 2026 imports, is due by 30 September 2027.

What are embedded emissions?

Embedded emissions are the greenhouse gas emissions released in producing a good. Under CBAM they are calculated from actual verified installation data where available, or from default values that carry a regulatory markup of 10 percent in 2026, 20 percent in 2027 and 30 percent from 2028.

Which products fall under CBAM iron and steel?

The iron and steel group covers most of combined nomenclature chapter 72 and listed headings of chapter 73, from pig iron and semi finished steel through flat rolled products, bars, rods, tubes and pipes, to finished articles such as screws, bolts and nuts and steel structures. Coverage follows the CN code of each good, so Annex I of Regulation (EU) 2023/956 is the reference for any specific product.

Are downstream or finished products covered by CBAM?

The definitive regime covers the six Annex I product groups: cement, iron and steel, aluminium, fertilisers, electricity and hydrogen, including finished articles that Annex I lists, such as iron or steel screws, bolts and structures. A proposal published in December 2025 would extend the mechanism to a wider set of downstream products from 2028, but that extension is a proposal only and has not been adopted.

What is the payable share and how fast does it rise?

Only a share of embedded emissions needs certificates while EU ETS free allocation phases out. The payable share is 2.5 percent for 2026 imports, then 5, 10, 22.5, 48.5, 61, 73.5 and 86 percent through 2033, reaching 100 percent in 2034. A shipment that costs little in 2026 carries nearly twenty times that certificate cost by 2030 on the same emissions, so verified low emission data compounds in value across the phase-in.

What are the penalties for missing CBAM obligations?

Each certificate missing at the 30 September surrender costs the EU ETS excess emissions penalty of 100 EUR per tonne of CO2e, indexed to European consumer prices since 2013, so the effective rate sits above that figure today. Importing covered goods above the 50 tonne threshold without authorised declarant status carries three to five times that rate under Article 26.

Do CN codes decide CBAM coverage?

Yes. Annex I of Regulation (EU) 2023/956 lists the covered goods by combined nomenclature (CN) code, grouped into six product groups. Whether a good is in scope follows from its CN classification rather than from its trade name, so classifying the product correctly is the first step of any CBAM exposure assessment.

How are CBAM embedded emissions calculated, step by step?

Embedded emissions are determined using the methods set out in the EU monitoring rules, principally a calculation based approach and a measurement based, or continuous monitoring, approach, with a mass balance option as a calculation sub method. The sequence runs as follows. First, the system boundary of the installation and the production process is defined. Second, production and activity data are gathered, covering fuels, raw materials, electricity and the relevant process emissions. Third, the calculation based or measurement based approach is applied to those data. Fourth, the result is converted into tonnes of carbon dioxide equivalent, the unit CBAM uses for embedded emissions. Fifth, the figure is reported, verified and shared so the EU importer or authorised declarant can rely on it. Default values published by the European Commission could be used where actual data was unavailable only until 31 July 2024; from 1 August 2024 reporting based on actual emissions was required, with a limited tolerance allowing up to 20 percent of a complex good's embedded emissions to rely on default or estimated values. The direct and indirect emission categories behind this work map onto the wider greenhouse gas scopes covered on the carbon footprint solutions page.

Can an accredited verifier in India support CBAM verification?

An accredited verifier in India supports the data work but does not, by itself, replace EU CBAM verification. NABCB, the National Accreditation Board for Certification Bodies under the Quality Council of India, accredits validation and verification bodies in India to ISO 14065 and ISO/IEC 17029 for greenhouse gas verification, which supports preparing and assuring the emissions data behind a covered good. The final EU CBAM declaration, however, must be verified by a verifier accredited under the EU CBAM accreditation rules set out in Commission Delegated Regulation (EU) 2025/2551, so an India accredited body supports and prepares the data while EU CBAM verification remains a separate step.

Does the India and EU trade agreement exempt Indian exporters from CBAM?

No. The India and European Union free trade agreement does not provide any exemption from the Carbon Border Adjustment Mechanism. CBAM remains fully applicable to imports from India, and the agreement instead establishes a technical dialogue on CBAM implementation. Indian exporters of CBAM covered goods to the European market stay subject to the mechanism, which is why a CBAM consultant in India works from the regulation as it stands rather than on any expected carve out.

Primary sources

The CBAM rules cited in this guide come from the European Union legal texts and the European Commission.

Request a CBAM readiness review

This guide sets out the rules; a readiness review applies them to a specific trade. The CBAM solutions page sets out the engagement, the CBAM cost calculator estimates certificate exposure year by year, and the CBAM discovery brief opens a structured first step.

Reviewed June 2026