Carbon Price Paid in a Third Country: How the CBAM Deduction Works

The logic of the deduction

CBAM is an equivalence measure mirroring the EU ETS on the import side. For that equivalence claim to hold, a carbon price already paid where the goods were produced has to be recognised; otherwise the same emissions are charged twice and the mechanism functions as a trade barrier rather than a levelling device.

The Regulation accordingly allows the importer to deduct a carbon price paid in the country of production, provided it can be documented. In the cost formula it appears as the fourth and final component.

The conditions

The deduction is not automatic. It depends on several conditions:

• Actually paid. A carbon price that exists in law but is not yet being levied cannot be deducted. Payment must be evidenced.
• Not directly refunded. Where the amount is subsequently refunded, offset or compensated through a support scheme, no right to deduct arises. This condition neutralises export-rebate style arrangements.
• Attributable to the same emissions. The deduction is limited to the amount matching the embedded emissions of the goods declared.
• Verified. The verifier of the emissions report must also verify the carbon price. The verification scope therefore extends beyond emissions.

The Commission foresees country-level default values for carbon prices and dedicated implementing rules during 2026, which will set out how the deduction is documented in practice.

Free allocation and why it blocks the deduction

This is the point most often misread. Many emerging emissions trading systems begin with high or full free allocation. Where an installation's emissions are covered by free allocation, no amount is actually paid, and there is consequently nothing to deduct under CBAM.

A deduction arises only where the installation's emissions exceed its free allocation and it buys allowances on the market, actually paying for them.

There is a further subtlety. Free allocation in most systems, including the EU ETS, is calculated against a benchmark rather than against actual emissions. An installation whose intensity exceeds the benchmark can therefore be short even where the nominal free allocation rate is 100%. In other words, "full free allocation" does not mean zero cost — and it is exactly that shortfall which creates a deductible amount on the CBAM side.

What producers need to do

The practical consequence is that a carbon price paid at home is not necessarily a sunk cost. To the extent the EU buyer can deduct it, the amount becomes an advantage in the supply relationship. Three things have to work together:

1. Documentation. The carbon cost paid must be traceable by product and reporting period. A total payment figure is not enough; it has to be capable of being matched to the emissions of the goods declared.
2. Verification. The emissions verifier must also verify the carbon price, so this belongs in the verifier engagement scope from the outset.
3. Transmission. The information has to reach the EU declarant in a form it can use in its declaration.

If any one of the three is missing, the amount paid at home is disregarded on the EU side and the same emissions are effectively charged twice.

Developments to watch

Two further items appear in the Commission's revision proposals. The first is allowing credits falling under Article 6 of the Paris Agreement to be set against CBAM liability. The second is the possibility of an agreement recognising a third country's carbon pricing system.

The second would be the more consequential change. Recognition at system level would replace product-by-product documentation of the deduction with a systemic mechanism, cutting administrative burden substantially. Exporting countries with operating emissions trading systems have made this a priority in their engagement with the Commission, alongside the mutual recognition of national accreditation bodies.

The wider relationship between an exporting country's own system and CBAM is covered in CBAM and the EU ETS compared.

How the deduction sits within the wider calculation is set out in the CBAM cost formula.

Frequently asked questions

Do energy taxes count?

No. The deduction is limited to charges specific to carbon pricing; general energy taxation is not treated as such.

Who calculates the deductible amount?

The declarant makes the calculation, but it rests on documentation supplied and verified on the producer's side.

Does a carbon tax qualify, or only emissions trading?

What matters is that a carbon price was actually paid, not the instrument's label.

Can the deduction exceed the CBAM obligation?

The obligation cannot fall below zero; a carbon price higher than the CBAM liability does not create a credit.

Sources

• European Commission — CBAM definitive regime
• European Commission — CBAM legislation and guidance

We work on documenting carbon prices paid and preparing them for verification alongside the emissions report, under our CBAM accounting and reporting service. You can contact us with your questions.