
If you're starting a business in Australia, you'll need to get to grips with the country's business registration numbers. There are a few different types, each serving a unique purpose. The main ones are the Australian Business Number (ABN), the Australian Registered Body Number (ARBN), and the Australian Company Number (ACN). Each of these registration numbers facilitates legal compliance and enhances business transaction transparency, credibility, and efficiency.
| Characteristics | Values |
|---|---|
| Name | Australian Business Number (ABN) |
| Unique Identifier | Yes |
| Number of Digits | 11 |
| Issuing Authority | Australian Taxation Office (ATO) |
| Registration Requirements | Running a business or other enterprise |
| Display Requirements | Must be displayed on invoices to avoid top withholding tax rate |
| Related Numbers | Australian Registered Body Number (ARBN), Australian Company Number (ACN) |
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What You'll Learn

What is an Australian Business Number (ABN)
An Australian Business Number (ABN) is a unique 11-digit identifier for any type of business or individual operating in Australia, including sole traders, partnerships, companies, trusts, and non-profits. It is issued by the Australian Taxation Office (ATO) and is used to ensure that businesses meet their financial obligations, such as paying taxes and managing invoices.
The ABN is a crucial identifier for businesses, allowing the government, other businesses, and the public to distinguish one business from another. It is separate from a tax file number and must be accompanied by a registered business name. This is particularly important because many businesses may have similar names, so the ABN provides a clear way to identify a specific business entity.
To register for an ABN, businesses must provide specific information, including directors' tax file numbers (for identification) and certified copies of identification documents for non-resident directors and shareholders. This process is managed by the Australian Business Register (ABR), which is operated by the ATO. It is free to register for an ABN through the ABR, and businesses can apply for an ABN online.
It is important to note that not all businesses require an ABN. To be eligible for an ABN, an entity must be running a business or other enterprise. Additionally, before registering for an ABN, businesses typically need to obtain an Australian Company Number (ACN). The ACN is a unique 9-digit identifier issued to companies upon registration, which remains the same even if the company changes its name or is deregistered.
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What is an Australian Company Number (ACN)
An Australian Company Number, commonly abbreviated as ACN, is a nine-digit unique identifier that is required by every company registered under Australia's Corporations Act 2001. The Australian Securities and Investments Commission (ASIC) issues the ACN to every Australian company. The number is typically printed in three groups of three digits and must be quoted on all correspondence and invoices issued by the company.
The ACN is a crucial identifier for companies operating in Australia, and it serves as a means of legal compliance and enhanced transparency, credibility, and efficiency in business transactions. It is mandatory for companies to display their ACN on various documents, including public documents, negotiable instruments, and all correspondence and invoices.
It is important to note that an ACN is different from an Australian Business Number (ABN). While an ACN is specifically for companies, an ABN is an 11-digit unique identifier for businesses and individuals engaged in business activities. An ABN is required for tax and other business purposes and is obtained from the Australian Business Register (ABR), operated by the Australian Tax Office (ATO).
Although an ACN remains the same even if a company changes its name or is deregistered, it is not required on certain items, such as packaging, labelling, advertisements that do not make specific offers, credit cards, machine-generated receipts, and business cards.
In summary, an Australian Company Number (ACN) is a vital identifier for companies operating in Australia, ensuring compliance and transparency in business operations. It is separate from an ABN, which is applicable to a broader range of business entities and individuals.
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What is an Australian Registered Body Number (ARBN)
The Australian Registered Body Number (ARBN) is a unique nine-digit number issued by the Australian Securities and Investments Commission (ASIC) to entities registering with them but not as companies. Foreign companies registering with ASIC are assigned an ARBN instead of an Australian Company Number (ACN).
The ARBN is issued to entities that are not registered as companies, including foreign companies, enabling them to apply for an Australian Business Number (ABN) and meet display requirements on public documents. The ARBN must be displayed on all public documents, including negotiable instruments published and signed in Australia, as mandated by the Corporations Act.
The ABN, on the other hand, is an 11-digit unique identifier for businesses and individuals engaged in business activities. It is issued by the Australian Business Register (ABR), which is operated by the Australian Tax Office (ATO). The ABN is used for tax purposes and other business reasons, and it helps identify a business to the government, other businesses, and the public.
It is important to understand the distinctions between these registration numbers, such as ABN, ACN, and ARBN, to ensure compliance and proper identification for businesses operating in Australia. These identifiers facilitate legal compliance and enhance business transaction transparency, credibility, and efficiency.
To become a registered Australian body, organisations must register with ASIC, which allows them to trade across all states and territories within Australia. Before applying, it is necessary to check the availability of the desired business name and ensure compliance with relevant laws and trademarks.
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When do I need an ABN, ACN, or ARBN?
An Australian Business Number (ABN) is an 11-digit unique identifier for businesses and individuals engaged in business activities. It is free to register for an ABN through the Australian Government's Australian Business Register (ABR), which is operated by the Australian Taxation Office (ATO). An ABN is required for tax purposes and other business reasons. To register for an ABN, you must be running a business or other enterprise.
A company's ABN must be displayed on an invoice, otherwise, the top withholding tax rate will be withheld if the total payment for goods and services exceeds AUD 75. When applying for an ABN, directors who are Australian residents must provide their tax file number (TFN) for identification purposes. Non-resident directors must provide certified copies of identification documents, and non-resident shareholders must also provide certified copies of their identification documents or a certificate of incorporation if the shareholder is a corporation.
The Australian Company Number (ACN) is a unique nine-digit number issued by the Australian Securities and Investments Commission (ASIC) to identify a company. Only companies are eligible for an ACN; sole traders and partnerships are not entitled to register for one. The ACN remains the same even if the company changes its name or is deregistered.
The Australian Registered Body Number (ARBN) is a unique nine-digit number issued by ASIC to entities registering with them but not as companies. Foreign companies registering with ASIC are assigned an ARBN instead of an ACN. Entities with an ARBN can also apply for an ABN. The ARBN must be displayed on all public documents, including negotiable instruments published and signed in Australia.
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How do I register for an ABN, ACN, or ARBN?
In Australia, there are different registration numbers for businesses, and they depend on the type of business entity. Here is how you can register for an ABN, ACN, or ARBN:
ABN (Australian Business Number)
An ABN is a unique 11-digit identifier for businesses and individuals engaged in business activities. Not everyone is entitled to an ABN, and you may face prosecution or criminal charges if you apply when not eligible.
To apply for an ABN, you need to provide accurate details to avoid delays. The application process is faster if you provide a tax file number for identification purposes. You can save your progress and come back to the application later, but this may delay the issuing of your ABN. Once you have an ABN, your details will be added to the Australian Business Register (ABR), which is publicly accessible.
ACN (Australian Company Number)
The Australian Company Number is a unique nine-digit number issued by the Australian Securities and Investments Commission (ASIC) to identify a company. Upon registering your company, you will automatically receive your ACN, which stays the same even if you change your company name or deregister. Sole traders and partnerships are not entitled to register for an ACN.
ARBN (Australian Registered Body Number)
The ARBN is a unique nine-digit number issued by ASIC to entities registering with them but not as companies. Foreign companies registering with ASIC are assigned an ARBN instead of an ACN. Entities with an ARBN can also apply for an ABN, and the ARBN must be displayed on all public documents.
It is essential to understand the differences between these registration numbers to ensure legal compliance and efficient business operations in Australia.
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Frequently asked questions
An Australian Business Number (ABN) is a unique 11-digit number that identifies a business to the government, other businesses, and the public. It is issued by the Australian Taxation Office (ATO) and must be accompanied by a registered business name.
You can apply for an ABN for free through the Australian Government's Australian Business Register (ABR), which is operated by the ATO. To get an ABN, you need to be running a business or other enterprise. Before registering, ensure you have all the necessary information about your business.
An Australian Company Number (ACN) is a unique 9-digit number that identifies a company. It is issued by the Australian Securities and Investments Commission (ASIC) when a company is registered. An ACN is different from an ABN and is only issued to companies, not sole traders or partnerships.
An Australian Registered Body Number (ARBN) is a unique 9-digit number issued by ASIC to entities registering with them but not as companies. Foreign companies registering with ASIC are assigned an ARBN instead of an ACN.































