
The Australian Company Number (ACN) is a unique nine-digit identifier issued by the Australian Securities and Investments Commission (ASIC) to every registered company in Australia. The ACN is required on various company documents, such as invoices, receipts, and official notices. It is one of the key elements required to operate legally in Australia. In this paragraph, we will explore the purpose of an ACN, how it differs from an ABN, and the process of obtaining one.
| Characteristics | Values |
|---|---|
| Full Form | Australian Company Number |
| Type of Entity | Companies |
| Issuing Authority | Australian Securities and Investments Commission (ASIC) |
| Number of Digits | 9 |
| Display | Mandatory on official documents |
| Change | Does not change even if the company changes its name or is deregistered |
| Use | Permanent identification number, required for legal protection, credibility and taxation benefits |
| Prerequisites | Registration of the company |
| Other Requirements | Tax File Number (TFN) and Australian Business Number (ABN) |
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What You'll Learn

ACN vs ABN
In Australia, an Australian Business Number (ABN) and an Australian Company Number (ACN) are two separate identification numbers with different obligations. ABNs and ACNs are unique numbers that are used to identify your business. However, the number you use will depend on the type of business structure you have.
An ABN is a unique 11-digit number that every business in Australia, no matter its size or structure, must have. It identifies the business and is used in commercial transactions and dealings with the Australian Taxation Office (ATO). ABNs are issued by the ATO and are used to identify and monitor a business for tax purposes. All businesses are required to apply for an ABN, and operating a business without one is illegal. ABNs are needed to register for GST, confirm a business's identity when ordering and invoicing, and access government online services.
An ACN is a unique 9-digit number that is only issued to companies. It is issued by the Australian Securities and Investments Commission (ASIC) and is used to monitor companies and for identification purposes. ACNs are part of a company's legal compliance and must be displayed on official documents. A company needs an ACN for legal protection, credibility, and taxation benefits. A company must have an ACN before it can get an ABN.
The process of obtaining an ABN is straightforward and can be done online through the Australian Business Register (ABR) or a registered tax agent. To apply, you will need information such as tax file numbers, previously held ABNs, ACNs, entity legal names, business contact details, and more.
On the other hand, obtaining an ACN is a more complex process as it involves setting up and registering a company. This includes choosing a unique company name, deciding on the company's governance structure, and understanding and meeting legal obligations. You can choose to set up a company yourself through ASIC or with the assistance of a lawyer or accountant.
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Registration process
An Australian Company Number, or ACN, is a unique identifier required by every company registered in Australia under the Corporations Act 2001 (Cth). The ACN is a nine-digit number issued by the Australian Securities & Investments Commission (ASIC) and acts as the company's official ID under Australian law.
The registration process for an ACN involves the following steps:
- Choose your company structure: Most businesses in Australia opt for a proprietary limited (Pty Ltd) structure, but it's important to consider your goals and compliance needs when making this decision.
- Pick a compliant company name: Ensure your chosen name meets ASIC's naming rules and is available. You can verify the availability of your desired name through the ASIC register before submitting your application.
- Get consent from directors and secretaries: Obtain formal consent from all appointees to their respective roles. Your company must have at least one Australian-resident director.
- Identify shareholders and issue shares: Determine who will own the company and allocate the number of shares each person will hold.
- Nominate a registered office address: Provide a physical address in Australia as your registered office address. PO boxes are not accepted.
- Submit Form 201 and pay the fee: Lodge your company registration through ASIC's online portal. Once your application is approved, ASIC will issue a Certificate of Registration, which includes your ACN.
It's important to note that an ACN is not required for all types of businesses in Australia. Sole traders, partnerships, and businesses operating under a trust typically don't need an ACN and can use an Australian Business Number (ABN) instead. However, if you're setting up a proprietary limited company, registering with ASIC and obtaining an ACN is essential.
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ACN as a company name
An Australian Company Number, or ACN, is a unique identifier for companies registered under Australia's Corporations Act 2001 (Cth). It is a nine-digit number issued by the Australian Securities and Investments Commission (ASIC) to every Australian company.
The ACN is separate from the company name and remains the same even if the company changes its name or is deregistered. It is mandatory to display the ACN on official documents, including all correspondence and invoices issued by the company. The number is usually printed in three groups of three digits and preceded by the letters "ACN".
The ACN serves as a permanent identification number for the company and is used to monitor companies and ensure they operate within legal and regulatory boundaries. It is crucial for maintaining compliance and running a business effectively in Australia.
To obtain an ACN, one must first register a company with ASIC. The process involves choosing a unique company name, deciding on the company's structure and governance, and meeting legal obligations. Once the company is registered, ASIC will automatically issue a unique nine-digit ACN.
Therefore, the ACN is an essential aspect of doing business in Australia, providing a way to uniquely identify registered companies and ensure compliance with legal and regulatory requirements.
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ACN and legal compliance
An Australian Company Number (ACN) is a unique nine-digit identifier issued by the Australian Securities and Investments Commission (ASIC) to every company registered in Australia under the Corporations Act 2001 (Cth). The ACN is permanent and remains with the company for its entire life, even if the company changes its name or is deregistered. It is mandatory to display the ACN on all official documents and serves as the company's permanent identification number.
The ACN is used to monitor companies and ensure they are operating within legal and regulatory boundaries. It is an important tool for legal compliance, as it brings a company under ASIC's regulations. Companies are required to display their ACN on all company documents, including invoices, public documents, negotiable instruments, and documents lodged with ASIC. The ACN must be quoted on all correspondence and invoices issued by the company and should be placed on the first page of documents where it is clearly visible and easily readable.
The ACN is also used for identification purposes, as it is a foolproof way to identify registered businesses in Australia. It helps to reduce fraud and mistakes by clearly differentiating between companies with similar names, as companies with similar names will tend to have different ACNs.
In addition to the ACN, companies may also be required to have an Australian Business Number (ABN) and a Tax File Number (TFN). The ABN is an eleven-digit number that all businesses must obtain and is used for commercial transactions and dealings with the Australian Taxation Office. A company can have only an ACN, but if it conducts business, it will also need an ABN. The ABN facilitates and streamlines business-to-government and government-to-business processes. If a company has an ABN, it may use it in place of the ACN on documents, as long as the ABN includes the nine-digit ACN within it.
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ACN and sole traders
An Australian Company Number, or ACN, is a unique identifier for companies registered under Australia's Corporations Act 2001. It is a nine-digit number issued by the Australian Securities and Investments Commission (ASIC) to every Australian company.
Sole traders, unlike companies, do not have an ACN. Sole traders are individuals carrying on an enterprise, and they are entitled to an Australian Business Number (ABN). This is a unique 11-digit identifier issued by the Australian Taxation Office (ATO) to various business structures, including sole traders, partnerships, companies, trusts, and other organisations. An ABN is required when a person or trust is registered with the Australian Business Register (ABR) and conducts a business.
The ABN facilitates and streamlines many Australian business-to-government and government-to-business processes, such as Australian Tax Office transactions involving the collection and remittance of GST. It is also needed to register a business name in Australia, regardless of whether the business is a company, partnership, or sole trader.
While a company can have both an ACN and an ABN, an individual or partnership will only have an ABN. When a sole trader applies for an ABN, they are required to provide certain information, including their legal name, date of birth, and business details. Notably, a sole trader's business address can be their home address.
It is worth noting that ABN details do not need to be renewed yearly, unlike ACN details. ABNs remain active indefinitely unless cancelled by the individual or the ATO.
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Frequently asked questions
ACN stands for Australian Company Number. It is a unique nine-digit identifier issued by the Australian Securities and Investments Commission (ASIC) to every registered company in Australia.
ABN stands for Australian Business Number. It is an eleven-digit number that all businesses must obtain. A company can have only an ACN, but if it conducts business, it will also need an ABN.
Yes, you need an ACN to start a company in Australia. An ABN is also required if you're carrying on an enterprise or starting a business.
You can get an ACN by registering your company with the Australian government's Business Registration Service. Once your application is processed, your company will be registered, and you will receive an ACN.
A company's ACN does not change even if the company changes its name or is deregistered. When a company is deregistered, its ACN is retired and cannot be reused.











































