• Australian Company Number (ACN)

    ACN is the abbreviation for the Australian Company Number which is a unique, nine-digit number issued by the Australian Securities and Investments Commission (ASIC) upon the registration of a company.

    A company’s ACN must appear on all ‘public documents’ and ‘eligible negotiable instruments’. Examples of documents where the ACN is required to appear include:

    • all documents lodged with ASIC;
    • statements of account, which includes all invoices;
    • receipts;
    • purchase orders for goods or services;
    • business letterheads;
    • official company notices;
    • cheques, promissory notes and bills of exchange; and
    • written advertisements making a specific offer.

    Australian Company Number is contrasted with an Australian Business Number (ABN) in that an ABN is issued to all entities (in any capacity such as a sole trader or partnership etc.) that carry on a business, whereas Australian Company Number is only issued to a company when it is registered with ASIC.

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