Australian Company Number ACN

Where must I show my company’s Australian Company Number (ACN)?

Under the Corporations Act 2001, every company in Australia is issued with a unique, nine-digit number, an Australian Company Number (ACN).

Companies are required to disclose their ACN on:

  • the common seal (if any);
  • every public document issued, signed or published by, or on behalf of, the company, including legal documents;
  • every eligible negotiable instrument issued, signed or published by, or on behalf of, the company;
  • and all documents required to be lodged with ASIC.


  • packaging and labelling, including envelopes and transport documents;
  • advertisements which do not make a specific offer which is capable of being accepted (such as advertisements which only promote the company and its goods or services in general);
  • credit cards and credit card vouchers;
  • machine-generated receipts, including cash-register receipts;
  • business cards and ‘with compliments’ slips; and items which are not documents (e.g., vehicles, television advertisements).

If you need help in deciding where you need to display the company name, the Pty Ltd and the ACN, then contact Noel or Amanda on (03) 9585 7555 or email us