What is ABN (Australian Business Number)?
An 11-digit identifier issued by the Australian Business Register to any entity carrying on business in Australia. The first two digits are a checksum, and the ABN is required on tax invoices and for GST registration. Look one up free on the ABR, which publishes entity name, status, GST registration dates, trading names and state.
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Look up a ABN (Australian Business Number) in the official register
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Related Terms
ACN (Australian Company Number)
A 9-digit identifier issued by ASIC to every company incorporated in Australia — as distinct from an ABN, which any business entity can hold. A company's ABN normally contains its ACN as the last nine digits. The ACN appears on the company's public ASIC record alongside status, registration date and registered office.
Company Registration Number
The permanent identifier a national business register assigns to a legal entity when it is incorporated — a Companies House number in the UK, an SIREN in France, a CVR in Denmark, an organisasjonsnummer in Norway. It never changes when the company is renamed, which makes it the safest key for storing, matching or monitoring a company record.
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