How can I find my ABN?
Ask your accountant
Your accountant has your Australian Business Number (ABN), and the ABN of your associated entities, on file at their office. It is usually stored in a computer system and is easily accessible. Alternatively, your accountant can access your ABN through your file at the Australian Taxation Office.
Search the ABN Lookup which gives you access to public information about businesses with an ABN. The Australian government provides this free online search facility, making it easy to find out your ABN.
Find your ABN at the National Names Index which is a free online index of Australian corporate and registered business names.
The Australian Taxation Office can supply you with your ABN.