
CBAM stands for "Carbon Border Adjustment Mechanism", namely the "Carbon Border Adjustment Mechanism", commonly known as the "Carbon Tariff". It is an environmental policy instrument proposed and implemented for the first time by the European Union. It aims to impose equivalent carbon costs on imported products as those borne by goods manufactured within the EU, and reduce the risk of "carbon leakage".
CBAM requires that high-carbon products imported into the European Union must pay for carbon emissions generated during production.
Important Reminder: If exporting enterprises fail to provide accurate low-emission data of products, their EU customers will face high carbon tariffs or fines, which will ultimately affect enterprises' orders in the EU and foreign trade profits.
EU CBAM entered the transitional period on 1 October 2023, which will end on 31 December 2025.
The formal taxation period will start on 1 January 2026. EU importers shall fulfil tax payment obligations for embedded carbon emissions of CBAM products. Relevant exporting enterprises need to cooperate with importers and provide CBAM product carbon emission data every year, i.e. submit CBAM reports verified and certified by third parties.
CBAM Development Timeline:
December 2019 | The European Union released the European Green Deal and proposed to set up CBAM |
June 2022 | The European Parliament adopted the CBAM proposal |
September 2020 | The European Commission announced that CBAM would be included in legislative proposals |
May 2023 | The CBAM Regulation was published in the Official Journal of the EU and formally enacted into EU law |
October 2023 (Transitional Period) | During the transitional period, importers only need to declare import volumes and carbon emissions of products without paying any fees. Within one month after the end of each quarter, importers shall submit quarterly reports (The first report shall be submitted no later than 31 January 2024). |
January 2026 (Implementation Phase) | Enterprises need to report annual carbon emission data of imported products and pay corresponding carbon emission fees. Free carbon emission allowances will be reduced year by year, in line with the phase-out pace of free allowances under EU-ETS. |
January 2035 (Formal Full Implementation Phase) | Enterprises need to report annual carbon emission data of imported products and pay full corresponding carbon emission fees.(Phase with 100% abolition of free allowances) |
CBAM Compliance Requirements for Exporting Enterprises:
Exporting enterprises are not direct obligated parties for EU CBAM declarations and do not need to purchase CBAM certificates (pay carbon tariffs). Nevertheless, exporting enterprises must cooperate with importers on CBAM data reporting requirements and submit CBAM product carbon emission reports verified by third-party institutions on schedule.
To meet EU CBAM data requirements, exporting enterprises shall complete the following core work starting from 2026:
CBAM Monitoring Plan Compliance Foundation | CBAM Report Including Precursor Data | CBAM Verification & Certification Third-party Institution | Domestic Carbon Price Payment Vouchers For Carbon Tariff Deduction |
Establish a monitoring plan in accordance with new CBAM rules, define installation boundaries, emission sources, accounting methodologies, etc., and coordinate upstream suppliers to provide measured data of precursor materials to ensure traceable and verifiable data.
| The annual CBAM report shall not only calculate embedded carbon emissions of products in compliance with regulations, but also realize "full-chain traceability" of data (including precursor data), and be compiled based on official templates.
| Whether a CBAM report requires verification depends on the calculation method. Verification is mandatory if actual measured values are adopted, while verification is not required for the EU default value method. After entering the taxation period, CBAM reports must be verified by EU-recognized third-party institutions.
| Carbon costs already paid domestically during product production can be used for carbon tariff deduction by EU importers. Enterprises shall fully retain valid documents including domestic carbon quota transaction vouchers and green electricity procurement agreements, and obtain official recognition from the EU. |
At present, the products covered by the EU CBAM include six industrial sectors: cement, iron and steel, aluminium, fertilisers, hydrogen and electricity, together with certain precursors and downstream products within these sectors, covering more than 570 product categories under CN codes.
Latest Update: On 17 December 2025, the European Union put forward a legislative draft, planning to expand the scope of CBAM starting from 2028 to cover approximately 180 steel and aluminium-intensive downstream products including machinery and equipment, motor vehicles and their components, and household appliances.
As a supporting mechanism of the EU Emissions Trading System (EU ETS carbon market), with technological constraints overcome, the coverage scope of CBAM carbon tariffs will be extended to all products, industries and sub-sectors exposed to carbon leakage risks in the future, including oil refining and chemical products.
Product Category | Types of Greenhouse Gases | Number of Tariff Lines Covered |
Iron, Steel and Related Articles | CO2 | 27 tariff lines under Chapter 72 and Chapter 73, among which 13 are excluded items |
Aluminium and Related Articles | CO2, PFCs | 14 tariff lines under Chapter 76 |
Cement | CO2 | 6 tariff lines under Chapter 25 |
Fertilisers | CO2, N2O | 6 tariff lines under Chapter 28 and Chapter 35, among which 1 is an excluded item |
Electricity | CO2 | 1 tariff line under Chapter 27 |
Hydrogen | CO2 | 1 tariff line under Chapter 28 |
After CBAM enters the taxation period, EU importers will start paying CBAM carbon tariffs.
Compliance with CBAM carbon tariff obligations is fulfilled by purchasing CBAM certificates from the European Commission. One CBAM certificate corresponds to one tonne of carbon dioxide equivalent embedded emissions. Importers are required to purchase a corresponding number of CBAM certificates according to the carbon emissions of the CBAM products they import.
Important Reminder: Before importers submit CBAM certificates to the EU, exporting enterprises need to submit CBAM product carbon emission reports verified and certified by third-party institutions, which serve as the basis for importers to determine the quantity of CBAM certificates to purchase.
The price of CBAM certificates is directly linked to the auction allowance price of the EU Emissions Trading System (EU ETS). For products exported in 2026, the price of CBAM certificates shall be calculated based on the quarterly average price of EU ETS; starting from 2027, the price of CBAM certificates shall be calculated based on the weekly average price of EU ETS.
CBAM certificate prices are published by the European Commission and available for enquiry on its official website. The CBAM certificate price for the first quarter of 2026 has been released: EUR 75.36.
Key Timelines for CBAM Certificates for EU Importers
Launch of CBAM Certificate Sales | CBAM Certificate Surrender | CBAM Certificate Buyback | CBAM Certificate Cancellation |
Starting from 1 February 2027 | From 2027 onwards | From 2027 onwards | From 2027 onwards |
The calculation of EU CBAM carbon tariff follows the formula below:
CBAM Carbon Tariff = (Embedded Carbon Emissions per Unit Product – EU Free Allocation) × Import Volume of Products × CBAM Certificate Price – Pre-paid Carbon Costs
* Parameter Description:
Embedded Carbon Emissions: meaning "embedded carbon emissions per unit CBAM product". Measured values or default values can be adopted.
Free Allocation: Free allocation for CBAM products = Product Benchmark Value released by the EU × Free Allocation Coefficient. The free allocation coefficient decreases year by year, which means carbon tariff costs will rise annually.
Certificate Price: namely the auction allowance price of EU ETS. Quarterly average price applies for 2026, and weekly average price will be adopted starting from 2027.
Pre-paid Carbon Costs: carbon emission expenses already paid for exported products in the country of origin. Valid supporting documents are required and must be recognised by EU authorities.
CBAM Carbon Tariff Calculation Approaches: Measured Value Method, Default Value Method, Combined Measured & Default Value Method
Calculation | Measured Value Method | Combined Measured & Default Value Method | Default Value Method |
Advantages | Lower CBAM carbon tariff costs payable by importers. Drives the whole supply chain to pursue green and low-carbon transition and accelerate the adoption of green technologies.
| For complex products where partial data is unavailable, this method enables compliant reporting while avoiding excessive carbon tariffs caused by exclusive use of default values. Allows comparison and balancing of overall costs brought by EU CBAM to identify the optimal cost solution.
| Exporters are not required to submit CBAM product data and incur no extra expenses. Importers can complete product import even without obtaining CBAM data from suppliers.
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Disadvantages | Exporters need to develop monitoring plans, prepare CBAM reports and undergo verification, incurring additional costs. It imposes high requirements on supply chain collaboration and requires traceable verified emission data of upstream precursors.
| Exporters need to develop monitoring plans, prepare CBAM reports and complete verification with certain extra costs, whilst facing pressure from buyers to cut product carbon emissions. Importers are liable for certain carbon tariff costs.
| It may directly cause loss of EU customers or reduced orders for exporters. Importers will bear substantial carbon tariff costs, which will rise year after year. |
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