
The Australian Business Number (ABN) is an 11-digit identifier issued to entities registered in Australia. It is used for tax and other business purposes, enabling businesses to interact with different levels of government using a single identification number. ABN registration is free and is maintained by the Australian Business Register (ABR), which is operated by the Australian Taxation Office (ATO).
| Characteristics | Values |
|---|---|
| Full Form | Australian Business Number |
| Purpose | Identifies a business, enabling it to deal with government departments and agencies |
| Applicability | All entities carrying on a business in Australia |
| Registration | Mandatory for tax purposes, free to register, and managed by the Australian Taxation Office (ATO) |
| Number Format | 11 digits, with the first 2 digits as a checksum |
| Multiple Businesses | One ABN can be used for multiple businesses if they operate under the same structure |
| Privacy | Businesses can request that certain details not be disclosed to the public |
| Updates | Changes in business structure may require a new ABN |
| Benefits | Increases business credibility and provides access to government services, grants, and concessions |
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What You'll Learn

Who needs an ABN?
An Australian Business Number (ABN) is a unique 11-digit identifier that is used by businesses in Australia to interact with government departments and agencies. It is important to note that not everyone needs an ABN and only those running a business or other enterprise are eligible for it.
If you are running a business or enterprise in Australia, you will need to apply for an ABN for tax and other business activities. This includes registering for tax obligations such as GST and PAYG withholding. You will generally need to quote your ABN on invoices or other documents relating to sales to another business.
If you are a non-resident carrying on a business or enterprise in Australia, you may be entitled to an ABN. This includes making sales connected with Australia in the course of carrying on your enterprise. However, your enterprise does not have to be located in Australia.
If you are planning to run your business through a company, you will need to register your company and obtain an Australian Company Number (ACN) before applying for an ABN. Additionally, if you are looking to become a director of a company, you will need to apply for a director identification number (director ID).
It is important to keep your ABN details up to date in the Australian Business Register (ABR). If you cease business, you will need to cancel your ABN by fulfilling all your lodgment, reporting, and payment obligations. You can also apply to have your ABN reissued if needed.
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How to apply for an ABN
An Australian Business Number (ABN) is an 11-digit identifier that makes it easier for businesses to interact with all levels of government and other businesses using a single identification number. It is free to register for an ABN through the Australian Government's Australian Business Register (ABR).
Not everyone needs or is entitled to an ABN. To be eligible, you need to be running a business or other enterprise in Australia. If you are a non-resident, you may still be entitled to an ABN if you carry on an enterprise or business in Australia or make sales connected with Australia.
Before applying, ensure you have all the necessary information about your business. You can apply for an ABN online or via paper application. When applying, you will be asked a series of questions to determine your entitlement. If you are setting up a business as an individual, providing your tax file number (TFN) will speed up the process. Companies should provide their Australian Company Number (ACN).
If you don't have all the information, you can still start your application and save it as you go, but issuing your ABN may be delayed. The ABR aims to review your application within 20 business days and will contact you if further information is required. If your application is processed successfully, you will receive a confirmation letter within 14 days. If your application is unsuccessful, you will receive a refusal letter within 14 days, outlining the reasons for refusal and your review rights.
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ABN registration and the ABR
The Australian Business Register (ABR) is responsible for all aspects of ABN registration and maintains the information available through ABN Lookup. The ABR is maintained by the Australian Taxation Office (ATO) on behalf of the Commonwealth.
The ABR does not impose a fee for applying for an ABN online or by paper application. It is free to register for an ABN through the ABR. The ABN is a unique 11-digit identifier issued to all entities registered in the ABR. It is a public number that identifies your business to the government, other businesses, and the public. It does not replace your tax file number.
To register for an ABN, you must be running a business or other enterprise. You can apply for an ABN on the ABR website. Before registering, ensure you have all the required information about your business. If you provide all the necessary information, you will receive your ABN as soon as you complete your online application. You can also save your application and come back to it later if you don't have all the information.
Once your application is processed, you will receive a letter within 14 days confirming your ABN or informing you of your application's refusal. If your application is successful, your ABN details will be added to the ABR, and you can access them through ABN Lookup. It is your responsibility to keep your details up to date. If your business ceases to operate, inform the ABR within 28 days, or your ABN may be cancelled.
You can use the ABN Lookup website to find publicly available registered ABN information. However, ABN Lookup does not have access to ABN registration details. Therefore, you should contact the ABR for any queries regarding your application.
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ABN Lookup
The Australian Business Register (ABR) maintains the information available through ABN Lookup and is responsible for all aspects of ABN registration. ABN Lookup is a free public view of the ABR. It provides access to publicly available information supplied by businesses when they register for an Australian Business Number (ABN).
The ABN is a unique 11-digit identifier issued to all entities registered in the ABR. It enables businesses in Australia to deal with a range of government departments and agencies using a single identification number. ABN registration details become part of the ABR, which the Australian Taxation Office (ATO) maintains on behalf of the Commonwealth.
The ABR does not impose a fee for applying for an ABN online or by paper application. You can apply for an ABN on the ABR website. To get one, you need to be running a business or other enterprise. You can conduct any number of businesses or activities under the same ABN provided they all operate under the same business structure. If your second or subsequent business operates under a different structure, you need to apply for separate ABNs for each new business structure.
You can use the ABN Lookup web services for ABN validation, pre-fill on your forms, and for keeping ABN details stored in your database up to date. ABN Lookup served over 1.1 billion searches in the last ten months, and 83% of those searches used the ABN Lookup web services.
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Benefits of having an ABN
An Australian Business Number (ABN) is a valuable tool that offers numerous benefits if you are running a business in Australia.
Firstly, having an ABN allows you to register Australian domain names such as “.au”, “.com.au”, or “.org.au”. These domain endings boost the legitimacy of your website and increase customer trust, as they are a quick signal that a business is local, trustworthy, and secure. This is a crucial step for any new business to facilitate growth, compliance, and a strong market presence.
Secondly, an ABN provides tax advantages. If you are registered for GST (Goods and Services Tax), you can claim GST credits on purchases made for your business. This includes recovering GST on items like office supplies, software, and equipment, as well as claiming business expenses like travel, marketing, and even part of your home office if you are a freelancer or sole trader. These tax benefits put more money back into your business, allowing for reinvestment and growth.
Thirdly, an ABN provides easy identification for your business. It helps you get paid in full, look professional, and protect your business identity. This is particularly important as it allows your business to be easily identified by government agencies, such as if emergency services need to contact businesses during a natural disaster.
Finally, having an ABN means you can access various government grants, loans, and support programs for small businesses, which often require an ABN to apply.
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Frequently asked questions
ABN stands for Australian Business Number. It is a unique 11-digit identifier issued to entities registered in Australia.
ABN is required for tax and other business purposes. It is necessary to interact with different government departments and agencies. It also increases the credibility of a business as it proves it is registered and recognised by the Australian Government.
You can apply for an ABN number through the Australian Business Register (ABR). The ABR does not impose a fee for applying for an ABN.
The Registrar of the ABR, who is also the Commissioner of Taxation, registers entities and issues ABNs.











































