The EU's carbon border charge began with reporting, not payment

The signal

In the Climate sector, the European Union's Carbon Border Adjustment Mechanism began its transitional phase on 1 October 2023. Regulation (EU) 2023/956, adopted 10 May 2023 and in force from 16 May 2023, requires importers of iron and steel, cement, aluminium, fertilisers, hydrogen and electricity to report the emissions embedded in those goods on a quarterly basis, with direct and indirect emissions listed separately along with any carbon price already paid abroad. The regulation names these sectors as among the largest aggregate emitters facing carbon-leakage risk, meaning production that could shift outside the EU to avoid its carbon price.

The evidence

The regulation's own text sets out two distinct periods, and the distinction is the substance of the signal. During the transitional phase, from 1 October 2023 to 31 December 2025, importers file quarterly reports but pay nothing; the last such report is due by 31 January 2026. A second document, the European Commission's Carbon Border Adjustment Mechanism page, describes what follows: from 1 January 2026, importers face authorisation requirements and must purchase and surrender CBAM certificates matching the embedded emissions of the goods they bring in. Reporting without payment is a data-gathering exercise; certificate purchase is a cost. Conflating the two stages would describe a mechanism that charges importers eighteen months before it does.

Timeframe and confidence

Confidence is high on the dates and structure, since both sources are the regulation and the Commission's own explanation of it, agreeing on the same transition and definitive dates. Confidence is lower on effects: neither document opened for this piece states what volume of goods has been reported, what average embedded-emissions intensity importers have declared, or whether reported flows have already shifted ahead of the 2026 charge. The mechanism's reporting phase is a designed information-gathering step, not itself evidence of a trade effect.

What would change the reading

A Commission report compiling the quarterly transitional filings, once available, would show what the reporting phase actually captured about embedded emissions and trade patterns ahead of 2026. Trade data showing a shift in the sourcing of covered goods away from higher-carbon suppliers before certificates become payable would be the direct test of a leakage-prevention effect.

• Is a compliance date being read as the date a cost begins, when the underlying document specifies a separate reporting-only period first?
• Does an emissions-intensity claim about traded goods come from a reporting requirement, or from an estimate made before reporting existed?
• Which covered sectors face the most exposed trade routes, and does the regulation's scope already include or exclude a strategist's own supply chain?

A border mechanism's transitional reporting period is a signal about a coming cost, dated precisely by the regulation itself, not a measurement of a trade shift that the mechanism may or may not eventually produce.

Source trail

1. Regulation (EU) 2023/956 establishing a carbon border adjustment mechanismeur-lex.europa.eu · Source publication: 2023-05-16 · Retrieved 2026-09-16

   Sets the transitional reporting period from 1 October 2023 to 31 December 2025, the definitive regime from 1 January 2026, and the covered sectors.

2. Carbon Border Adjustment Mechanismtaxation-customs.ec.europa.eu · Source publication: not established · Retrieved 2026-09-16

   European Commission's living explainer distinguishing the reporting-only transitional phase from the certificate-purchase definitive regime starting 2026.

Read across the evidence

• A carbon credit standards body set a common bar in 2023
• The Inflation Reduction Act's energy credits scale with take-up
• The EU battery law phases its duties in from 2024 to 2036

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