How to Register for CBAM Verifier Accreditation?
A step-by-step guide for verifiers
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Before You Begin
Registration in the CBAM Registry happens in two stages. The first is technical access through EU Login, the European Commission's shared authentication system. The second is a business-level application submitted through the O3CI portal, which your National Competent Authority reviews and approves.
This guide assumes you already hold CBAM accreditation from a national accreditation body; the accreditation process itself is a separate track and is not covered here. You will need a company email address, your accreditation details on hand, and awareness that registration requests cannot be submitted before September 1, 2026.
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Step-by-Step: CBAM Verifier Registration
Step 1: Confirm Your CBAM Accreditation Is Finalised
Registration in the CBAM Registry only opens once accreditation is complete. Without it, the O3CI portal will not allow you to submit a verifier registration application, so this step is a hard prerequisite rather than a formality.
Step 2: Create an EU Login Account
Register at the EU Login portal using a company email address, which the Commission strongly recommends over a personal one. Set a password, confirm your registration through the email link you receive, and then set up two-factor authentication using the EU Login app, a QR code, or a FIDO2 key.
Step 3: Access the O3CI Portal
Once your EU Login account is active, go to the CBAM Registry's O3CI portal and log in with your EU Login credentials. This is the same portal used by non-EU operators, but accredited verifiers use it specifically to register and later connect with declarants.
Step 4: Submit the Verifier Registration Application
Within the O3CI portal, complete the application to become a registered accredited verifier, following the Commission's verifier access guide published August 28, 2026. This is where you formally request registration rather than simply technical access.
Step 5: Wait for Your National Competent Authority's Approval
Your application goes to the NCA in the country where you hold accreditation. The Commission notes that approval can take several weeks, so this step, not the technical setup, is usually the longest part of the process.
Step 6: Confirm Working Access Once Approved
Once the NCA approves your registration, you gain working access in the CBAM Registry, available no earlier than September 30, 2026. From this point, you can connect with non-EU installation operators, review their emissions data, and prepare to issue verification reports.
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Tips, Mistakes and Troubleshooting
Do Not Wait to Submit
Registration requests are due within two months of receiving CBAM accreditation, so treat the two-stage process as something to start immediately rather than something to schedule around other priorities.
Mind the September 1, 2026 Start Date
The O3CI portal was not open for verifier registration applications before September 1, 2026, so any attempt to register earlier simply was not possible. This is a system constraint, not a mistake on the applicant's side.
Monitor Your EU Login Email Closely
Both Commission and NCA communications, including approval decisions, go to the email address linked to your EU Login account, so treat that inbox as your primary channel during the review period.
Know What Comes After Approval
Once registered, verifiers are expected to begin issuing verification reports in the CBAM Registry from January 2027, ahead of the first annual declaration deadline of September 30, 2027.
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Conclusion
Registering as a CBAM verifier follows a clear sequence: confirmed accreditation, an EU Login account, an O3CI application, and National Competent Authority approval.
Given the two-month submission window and a multi-week review period, the practical takeaway is to start the process as soon as accreditation is in hand rather than waiting for a quieter moment.
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Frequently Asked Questions
How do I register as a CBAM verifier?
After obtaining CBAM accreditation, create an EU Login account, apply through the O3CI portal, and wait for your National Competent Authority to approve the registration.
What is O3CI in CBAM verification?
O3CI is the CBAM Registry portal that accredited verifiers use to register and later connect with non-EU installation operators and declarants.
Do I need CBAM accreditation before I can register in the Registry?
Yes, accreditation from a national accreditation body is a prerequisite for Registry registration.
How long does NCA approval take?
The European Commission notes that approval can take several weeks.
When can accredited verifiers begin working in the CBAM Registry?
Working access follows no earlier than September 30, 2026, after registration is approved.
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