Preparing Your First CBAM Report: A Step-by-Step Guide

The first CBAM data cycle is always the hardest. Once you have a repeatable process, each subsequent one is routine. This guide gives Indian exporters a practical, step-by-step path to preparing the emissions data your EU buyer needs — the data that fed their quarterly CBAM report during the transitional period (October 2023 to December 2025) and now feeds their annual CBAM declaration in the definitive period from 1 January 2026.

Note the split of responsibility, because it shapes everything: the formal CBAM report or declaration is filed by the EU importer, who from 2026 must be an authorised CBAM declarant and must buy and surrender CBAM certificates. Your job is to give them accurate, EU-format, verifiable emissions data. In practice that supplier-side work is what matters most, and it is what this guide covers, following the structure of Regulation (EU) 2023/956 and the European Commission's tools.

Step 1: Confirm which products are in scope

Before collecting any data, list every product you export to the EU and map each to its eight-digit CN code. Check those codes against the covered goods in the annex to Regulation (EU) 2023/956. Only in-scope products need emissions data. This step prevents you wasting effort on goods that are outside CBAM and prevents you missing goods that are inside it. Confirm borderline classifications with your customs broker, since the code must match what is declared at EU import.

Step 2: Identify the installations involved

Emissions are reported at installation level. Identify which of your sites produce each in-scope product. For each installation, you will need details such as its name and location, the production processes it runs, and the goods it makes. If you source precursors from other sites or suppliers, note those too, because their embedded emissions form part of your product's footprint. Building this installation-and-precursor map early makes the later data collection far more orderly.

Step 3: Gather the underlying data

Collect the raw inputs to the emissions calculation for a defined reporting period:

• Production volumes for each in-scope product.
• Fuel and process-material consumption (activity data) for direct emissions.
• Electricity consumption and its source and emission factor for indirect emissions.
• Embedded emissions of any precursors, from supplier data or defaults.
• Any carbon price already paid domestically, with supporting evidence.

Step 4: Calculate embedded emissions

Using the EU methodology, convert your activity data into direct emissions, add indirect emissions from electricity, incorporate precursor emissions, and allocate the total across your products to get specific embedded emissions per tonne. Draw a clear system boundary so nothing is double-counted, and record the basis of every allocation. Where actual data is incomplete, EU default values can fill gaps, but aim to use actual data wherever possible because it is usually more favourable and its use is expected in the definitive period.

Step 5: Use the EU communication template

The European Commission provides a standard communication template for installation operators to pass emissions data to importers. Populating this template is the cleanest way to hand over data, because it maps directly to what your buyer needs for their CBAM report or declaration. Ask your buyer whether they want the data in this template and follow its structure so nothing is lost in translation. Using the EU's own template also signals to buyers that you are a serious, low-friction supplier.

Step 6: Coordinate with your EU buyer

Because the importer files the actual report, alignment with them is essential. Confirm the reporting period they need, the deadline, and the level of detail. Under the definitive period the importer submits an annual CBAM declaration rather than quarterly reports, so agree a rhythm that lets you deliver verified data comfortably ahead of their declaration deadline. Clear, early communication turns CBAM from a point of friction into a routine part of the trading relationship.

Step 7: Document and prepare for verification

Keep a complete record of your data sources, calculations, system boundary and assumptions. In the definitive period, embedded emissions must be verified by accredited verifiers, so your figures should be transparent and reproducible by someone who did not build them. Treat your first submission's working file as the template for an auditable, version-controlled process, not a throwaway spreadsheet.

Common first-time mistakes to avoid

• Assuming a whole product range is in or out of scope instead of checking each CN code.
• Relying entirely on default values when actual data would give a lower footprint.
• Forgetting indirect emissions from electricity, which can be significant for metals.
• Leaving data collection until the buyer's deadline instead of building it into normal operations.
• Not documenting a domestic carbon price that could reduce the buyer's obligation.
• Keeping calculations in an unstructured file that a verifier cannot follow.

How Social Lab helps with your first cycle

Social Lab helps Indian exporters get the first CBAM cycle right so every later one is routine. We confirm scope by CN code, map your installations and precursors, set up structured data collection for activity data and electricity, run the embedded-emissions calculation on the EU methodology, populate the Commission's communication template, and align the timing with your buyer's declaration deadlines. We also build the documentation into a verification-ready file from the start. Approach your first CBAM data cycle as building a system, not filing a one-off form, and every future cycle becomes faster while you become the well-organised supplier EU buyers prefer to keep.

Frequently asked questions