Your Agent Grant Authorisation / Verification of Agent Reference Number was incomplete. Please correctly enter the Agent Reference Number (ARN) and Re-Authorise
If you do not have Agent HMRC Gov Gateway Credentials or an Agent Reference Number (ARN), you must first register with HMRC as a Tax agent and apply for an ARN. Once you have obtained your Agent credentials and ARN, you can return here to proceed with the Agent Grant Authorisation process.