An 11-digit identifier issued by the Australian Business Register (ABR) that identifies a business entity to the government and to other businesses. All businesses operating in Australia need an ABN to issue invoices, register for GST, open a business bank account, and receive certain government payments. Sole traders, companies, partnerships, and trusts can all hold an ABN.
Understanding the fundamentals of Australian business setup is essential for any entrepreneur or sole trader. Whether you are just starting out or looking to optimise your existing setup, understanding ABN (Australian Business Number) is an important step.
Key points
- ABN required for all businesses operating in Australia
- ASIC registration mandatory for companies
- Choosing the right business structure impacts liability and tax
- A registered business address must be a real street address
Why it matters for your business
In today's evolving Australian business landscape, staying informed about concepts like ABN (Australian Business Number) gives you a competitive edge. From sole traders and freelancers to growing companies, these fundamentals apply across all business types and sizes.
How Space Penguin can help
Space Penguin provides flexible workspace solutions, virtual addresses, and business support services across Australia. Whether you need a professional registered address, a coworking desk, or a private office, we have options to suit every stage of your business journey.
Explore our full glossary for more essential Business setup terms and definitions.

