The Registrar of the Australian Business Register may cancel your ABN if there is evidence that you no longer entitled to it. For example, where information available indicates that you are no longer carrying on an enterprise as you have not in the last 2 years:
If you receive a letter saying your ABN has been cancelled it will include the reason. If your ABN has been cancelled and you did not receive a letter it could mean your contact details were not up to date.
If you don’t agree with the decision to cancel your ABN, you can call us on 139 226 to discuss.