Your buyer asked you to sign a CBAM supplier declaration

Some buyers send a letter to sign, confirming your emissions data is accurate and that you'll provide more. Read it before you sign it.

Reviewed by the Carbon Passport compliance team, Singapore. Updated and checked against official EU sources on 28 September 2026. Rules change often; we update this page when they do.

Quick answer

A CBAM supplier declaration is a signed statement that your emissions data is accurate and that you'll provide updates and verified data. Sign once the wording matches what you can deliver, but push back on guarantees that data will pass verification and on open-ended cost indemnities.

What this request is

A short letter or form, usually prepared by the buyer's compliance or legal team, asking you to confirm that the emissions data you provide is accurate, that it follows the EU method, and that you'll supply updates and verified data by certain dates. Some include liability or cost-sharing wording.

Why your buyer is asking

The importer is legally responsible for its CBAM declaration. A signed statement from you gives it a paper trail showing it relied on supplier information in good faith, and sometimes a way to pass costs back if the data turns out to be wrong.

What to send

  1. The declaration signed only after the wording matches what you can deliver
  2. The data or template it refers to, with the period and installation named
  3. A list of assumptions and whether figures are provisional or verified
  4. Your realistic timeline for verified data

Be careful about

  • Wording that guarantees figures will pass verification
  • Open-ended indemnities for the buyer's CBAM costs or penalties
  • Deadlines earlier than a verifier can realistically visit
  • Confidentiality: make sure your data is used only for CBAM purposes
  • Have a lawyer review any indemnity or liability clause

A reply you can adapt

Dear [name],

Thank you for your supplier declaration. We are happy to confirm that the data we provide for [period] is prepared in line with the EU CBAM methodology and is accurate to the best of our knowledge.

Before signing, we would like to adjust two points: our [period] figures are provisional until verification, which we expect by [month], and we cannot accept liability beyond correcting data we have supplied. A marked-up version is attached.

Kind regards,
[name]

Keep a copy of everything you send. The same buyer will ask again next year, and other buyers will ask for the same data.

Got a request you're not sure about?

Send us what your buyer sent. We'll tell you what they need and what it will take, free, within one week.

Send your request

Frequently asked questions

Should I sign a CBAM supplier declaration?

Usually yes, once the wording matches what you can deliver. Push back on guarantees and open-ended cost indemnities.

Can the buyer make me pay their CBAM costs?

Only if you agree to it contractually. Check any clause that shifts certificate costs or penalties to you.

What if my data is still provisional?

Say so in the declaration and give a date for verified data.

Sources

This guide explains the rules in plain language. It isn't legal advice; see our disclaimer. Always check the current official texts and your buyer's instructions.

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