CBAM reporting basics for US exporters

What CBAM is, from a US exporter's side

The EU's Carbon Border Adjustment Mechanism (CBAM) requires importers bringing certain goods into the EU, currently covering categories like iron and steel, aluminum, cement, fertilizers, hydrogen and electricity, to report the embedded greenhouse gas emissions in those goods. As a non-EU exporter, you are not the one who files the CBAM report; your EU customer's authorised declarant does. But that declarant needs emissions data from you, organized by installation and production route, and if you cannot provide it, they generally have to fall back on higher default values, which raises the CBAM cost on your shipment.

This is general information, not legal, tax, customs or engineering advice, and not a substitute for official EU guidance. CBAM's phased requirements and default values have been updated over time; confirm current rules on the European Commission's official CBAM pages before you or your declarant files anything.

Who this actually affects

• Non-EU manufacturers of steel, aluminum, cement, fertilizer, hydrogen or electricity shipping into the EU
• Export or compliance managers whose EU customer's declarant has asked for embedded-emissions data they do not yet have organized
• Finance teams trying to estimate CBAM certificate cost exposure on EU-bound shipments before it shows up as a customer complaint or a lost bid

The data to start collecting now

Organize this by installation (the specific production facility) and by production route, not just by product:

• CN (Combined Nomenclature) codes for each good you ship to the EU
• Annual volume shipped to the EU, by good
• Production route: for steel, whether it is blast furnace/basic oxygen (BF-BOF) or electric arc furnace (EAF), since these have very different emissions profiles; for other goods, the equivalent process distinction
• Direct emissions data if you measure it (fuel combustion, process emissions at the installation)
• Precursor material emissions if your product incorporates materials made elsewhere (for example, steel made from purchased pig iron)
• Electricity source and emissions factor for purchased power used in production

Default values versus your own measured data

The EU publishes default embedded-emissions values by product and route for use when measured data is not available, generally accepted during the transitional and early definitive-period timelines. Default values are convenient but tend to produce a higher embedded-emissions figure than actual measured data from an efficient installation, which means a higher CBAM certificate cost for your EU customer. If your production process is more efficient than the industry default assumes, measuring and reporting your actual data is usually worth the effort, since it can lower the number your customer's declarant reports.

	EU default values	Your own measured data
Effort to obtain	None, already published	Requires installation-level monitoring and, eventually, verification
Typical result	Often higher than an efficient installation's real emissions	Can be lower if your process is efficient, but requires evidence
Acceptance	Accepted during transitional and early periods per current EU rules	Preferred long-term, and eventually may be required for some categories, confirm current phase-in rules

Structuring your data the way a declarant needs it

A declarant working through the CBAM registry needs data organized by installation, by CN code, and by reporting period (quarterly or annual, depending on the current reporting phase). A spreadsheet organized any other way (by customer, or by shipment date alone) usually needs to be reorganized before it is usable, which costs time on both sides. Structure your workbook with one row per installation-and-product combination, showing volume, route, and whichever emissions figures (default or measured) apply.

Building a gap list for next quarter

Alongside your current numbers, keep a simple gap list: which figures are still using EU defaults, and what measured data would replace each one. This turns CBAM compliance from a one-time scramble into a running project, where each quarter you can point to specific measurement investments that would lower your customer's reported number, which is also a competitive argument when a buyer is comparing suppliers on landed CBAM cost.

What your declarant will probably ask for

• A confirmed CN code for each product shipped, matched to the EU customs declaration
• Annual or quarterly volume, by product and by installation
• Whichever emissions figures you have, clearly marked as measured or default
• Contact details for someone at your company who can answer follow-up questions during the reporting window

Sending this proactively, before your customer's declarant has to chase you for it, is a small thing that makes you an easier supplier to keep buying from as CBAM's cost impact grows.

Timing your response to the reporting calendar

CBAM reporting runs on a periodic cycle (quarterly during earlier phases, moving toward other cadences as the definitive period matures per current EU rules), and each period has its own submission window. Ask your EU customer's declarant directly what reporting period they need data for and by when, rather than guessing, since a late submission on their end can affect the shipment's clearance or cost treatment.