CBAM Transitional Period: What India’s Quarterly Reports Revealed About Industry Readiness

The CBAM transitional period ran from 1 October 2023 to 31 December 2025, with EU importers required to file quarterly reports on embedded emissions for CBAM-covered goods. For Indian exporters, the main lesson from that period is simple: many buyers relied on default values rather than supplier-specific emissions data, and that left a large compliance gap once the definitive regime began in January 2026.

Key Takeaways

  • During the transitional period, importers could report either actual embedded emissions data supplied by the exporter or EU Commission default values. The transitional phase was designed as a learning period, not a final compliance model, and quarterly reports had to be filed in the CBAM Transitional Registry.
  • A large share of CBAM reports relied on default values rather than producer-specific data, especially when suppliers in third countries had not yet built reliable emissions-monitoring systems. That created a readiness gap for Indian exporters that is now much more visible in the definitive regime.
  • In the definitive period, CBAM compliance shifts toward verified actual emissions data. Standard transitional-style reporting is no longer enough, and importers now need emissions data that can withstand verification under the CBAM framework.
  • The first annual CBAM declaration for 2026 imports is due on 30 September 2027. That makes 2026 a critical data-collection year for exporters that did not already have robust MRV systems in place.
Jan 2026Definitive regime begins — shifting compliance from default reporting to verified actual data
30 Sep 2027Deadline for the first definitive annual CBAM declaration covering 2026 imports
Verified DataStandard transitional reporting is replaced by installation-level verified MRV requirements
High RiskDRI-EAF steel and secondary aluminium face severe cost inflation if relying on default values

What defaults meant

EU default values were used when importers could not obtain supplier-specific emissions data. During the transitional phase, those defaults were intended to keep trade flowing while nudging exporters toward better data quality.

The problem is that defaults can overstate or understate actual emissions depending on the product and the producer. For lower-carbon Indian manufacturers, especially DRI-EAF steel and scrap-based aluminium, the default values were often much higher than actual emissions, creating a misleading picture of carbon exposure.

That difference matters because CBAM is not just a reporting exercise anymore. The same data that were treated as approximate during the transitional phase now feed directly into certificate obligations in the definitive regime.

Steel and aluminium

For steel, the gap between default values and actual emissions is modest for BF-BOF producers, but much larger for DRI-EAF producers. A BF-BOF exporter may sit relatively close to a CBAM default, while a gas-based DRI-EAF plant could be far below it.

For aluminium, the risk of distortion is even greater. Primary aluminium is carbon-intensive, but scrap-based secondary aluminium can be far cleaner, so using a primary-aluminium default for a secondary producer can dramatically inflate the apparent CBAM liability.

That is why the readiness gap is commercially important. A supplier that has not built plant-level emissions tracking can end up appearing far dirtier than it really is, which can distort pricing, negotiations, and sourcing decisions.

Verification requirements

Under the definitive CBAM framework, actual emissions data must be verified by an accredited verifier operating under the CBAM verification rules. The Commission’s framework is built around independent verification, accreditation by EU national accreditation bodies, and registry-based reporting.

The framework requires verifiers to be recognised within the EU CBAM accreditation system, rather than demanding only specific brand-name validation firms. Local verification bodies can participate if they meet the equivalence and accreditation criteria.

For exporters, that means MRV systems must be built at the installation level, with clear methodology, traceable records, and enough documentary support for a verifier to test the numbers.

Financial impact

Using default values can materially change the estimated CBAM cost of a shipment. For BF-BOF steel, the difference may be limited if the producer is already close to the default; for DRI-EAF steel or scrap-based aluminium, the difference can be enormous.

This is especially true for secondary aluminium, where a scrap-based producer may have actual emissions far below the primary-aluminium default. In those cases, relying on defaults can make a low-carbon product look far more carbon-intensive than it actually is.

The key commercial lesson is that exporters who invested early in verified emissions data will be better placed to defend value, while those who relied on transitional defaults may now face pricing pressure or delayed sales.

Indian readiness gap

The readiness gap is most acute among mid-tier and downstream exporters. Large integrated groups have generally moved earlier on CBAM monitoring, but smaller tube, pipe, wire-rod, and specialty alloy exporters often still lack the data systems needed for definitive compliance.

That does not mean they are excluded from the EU market. It means they need to accelerate emissions accounting, verifier engagement, and product-level mapping now, rather than waiting until the first annual declaration deadline arrives.

For exporters that have never run an installation-level emissions inventory, the immediate priority is to map Scope 1 and Scope 2 data to the CBAM methodology and to prepare for verification under the definitive rules.

Bottom line: The transitional period exposed a real readiness gap in Indian industry. Many exporters could survive the reporting phase by relying on defaults, but the definitive regime now rewards actual emissions data, formal verification, and disciplined MRV systems. For Indian exporters, the message is straightforward: the transitional phase is over, and the compliance bar has moved from approximate reporting to verifiable emissions accounting.

Frequently Asked Questions

Can importers still use default values in the definitive phase?

The definitive regime is built around actual verified emissions data and a formal CBAM verification process. Default values are not a substitute for proper supplier data in routine compliance planning.

What verification standard applies?

Emissions data must be verified under the CBAM framework by an accredited verifier recognised through the EU accreditation system. The relevant verifier must be independent and qualified to assess the embedded emissions calculation.

What should an exporter do now?

Exporters should build an installation-level emissions inventory, align it with CBAM methodology, and contract a recognised verifier as early as possible. That is the only practical way to avoid being stuck with transitional-period assumptions in a regime that now requires defensible actual data.

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