
If you run a business in Australia, you need to have an Australian Business Number (ABN) to carry out commercial activities. An ABN is a unique 11-digit number that identifies your business to the government, other businesses, and the public. It is free to register for an ABN through the Australian Government's Australian Business Register (ABR), which is managed by the Australian Taxation Office (ATO). If you have misplaced your ABN, you can find it using the free online tool ABN Lookup, which allows you to search by your business name, ABN, or ACN (Australian Company Number). Alternatively, you can check any government documents such as tax invoices or letters sent to your business.
| Characteristics | Values |
|---|---|
| ABN full form | Australian Business Number |
| ABN definition | ABN is a unique 11-digit number that identifies a business to the government, other businesses and the public. |
| ABN registration authority | Australian Taxation Office (ATO) |
| ABN registration website | Australian Business Register (ABR) |
| ABN registration fee | Free |
| ABN Lookup | A free tool provided by the ABR to find the ABNs of all registered businesses. |
| ABN Lookup search parameters | Business name, ABN, or ACN |
| ABN validity | ABNs may be cancelled by the ABR if unused. |
| ABN reactivation | Possible by submitting an online application. |
| ABN on business documents | ABN must be displayed on letterheads and tax invoices. |
| ABN on government documents | ABN should be included on tax invoices or any letters sent by the government. |
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What You'll Learn

Using the ABN Lookup tool
ABN Lookup is a free public view of the Australian Business Register (ABR). It is a tool that allows users to access the publicly available information provided by businesses when they register for an Australian Business Number (ABN). ABN Lookup can be used to perform multiple searches and serves over 1.1 billion searches in the last ten months.
To use the ABN Lookup tool, simply visit the ABN Lookup website and enter the ABN you want to look up. The tool will then display the publicly available information associated with that ABN, such as the business name and address. You can also use the ABN Lookup tool to validate ABNs and pre-fill forms. Additionally, you can use the ABN Lookup web services to integrate ABN Lookup validation and data into your own applications and keep ABN details stored in your database up to date.
It is important to note that ABN Lookup will only display information that is publicly available and has been supplied by businesses during their ABN registration. This information may not always be up-to-date, so it is essential for businesses to keep their ABN details current.
When checking an ABN, it is generally not necessary to verify the number quoted by a supplier unless there is a reason to suspect it might not be genuine or belong to a different supplier. In such cases, you can use the ABN Lookup tool to confirm the validity of the ABN and ensure it matches the supplier's details. If the ABN quoted is invalid or does not match the supplier, you must withhold payment at the top tax rate.
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Checking government documents
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 necessary for tax and other business purposes. Registration for an ABN is free and can be done through the Australian Government's Australian Business Register (ABR). The Australian Taxation Office (ATO) manages the ABR.
If your ABN application is successful, your details will be added to the ABR as either public or non-public information. Publicly available information includes your approved worker entitlement fund status, Australian Company Number or Australian Registered Body Number, Australian Charities and Not-for-profits Commission (ACNC) registration status, and deductible gift recipient status.
There are several ways to check an ABN. The ABN Lookup tool, for example, allows you to search for ABNs by ABN/ACN or name and refine your search with extra filters such as state, postcode, tax concessions, and deductible gift recipient status. ABN Lookup also provides quantitative information about ABNs by location, status, and type. The service is free and easy to use, having served over 1.1 billion searches in the last ten months.
Additionally, if you suspect that an ABN quoted to you is incorrect, you can verify it online or by phone through the self-help services provided by the Australian Taxation Office. You can also report incorrect ABNs through these services.
It is important to keep your ABN details up-to-date, as government agencies rely on this information to provide important community services. If your business operations cease or your details change, you must notify the ABR within 28 days. Failure to do so may result in the cancellation of your ABN.
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Contacting the ABN Lookup
ABN Lookup is a free public view of the Australian Business Register (ABR). It provides access to publicly available information supplied by businesses when they register for an Australian Business Number (ABN).
If your ABN application is successful, your details will be added to the ABR and you can check your ABN via ABN Lookup. You can use the search box at the top of every page to search ABN Lookup by ABN/ACN or name. Additional search options are also available, such as using advanced search to refine your search with extra filters such as state, postcode, tax concessions, and deductible gift recipient status. You can also use the statistical query to report quantitative information about ABNs by location, status, and type.
If you cannot find your ABN using the search box, you may need to manually enter your ABN and company name by clicking "Manual Entry" in the error message. It is important to keep your ABN details up-to-date.
If you have any questions or concerns about contacting or using ABN Lookup, you can refer to the help section on the ABN Lookup website for further information and guidance.
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$161.99

Reactivating a cancelled ABN
If you want to run any kind of business in Australia, you need to have an ABN (Australian Business Number). This is a registration number issued by the Australian Tax Office (ATO), and it allows businesses to carry out commercial activities. Your ABN will stay with you for life, but if you lose it, you can find it by checking any documents you have from the government, such as your Tax Invoice or any letters sent to your business. You can also use the online tool ABN Lookup to search by your name or ACN (Australian Company Number).
If your ABN has been cancelled, you must follow the process of getting this reactivated. This is because quoting an inactive ABN in a transaction is an offence. Further, if your business makes $75,000 per year or more, you cannot trade without an active ABN. To reactivate your ABN, you need to re-apply for it. A simple way is through Lawpath's ABN registration service, where you can reactivate your ABN within 24 hours. First, enter your basic contact information, such as your email, contact number, name, and business location (please note that this must be a physical address, not a PO box). An ABN typically takes 24 hours to reactivate once the application is submitted online, but it may take longer in some cases where additional information is required.
If your ABN is inactive, your business is not registered for goods and services tax (GST) and other tax obligations. This could result in fines and penalties if you continue to operate your business without an active ABN. An inactive ABN can last up to two years. After that, it will be automatically cancelled by the Australian government. If you wish to continue operating your business, you will need to apply for a new ABN.
The Australian Business Register (ABR) maintains the information available through ABN Lookup and is responsible for cancelling and issuing ABNs. You must inform the ABR if you have ceased trading or your business has been sold. Only when your ABN has been cancelled on the ABR will it show as 'cancelled' on ABN Lookup. As ABN Lookup cannot cancel or issue an ABN, you must contact the ABR for further assistance.
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Keeping your ABN updated
To update your ABN details, you can log in to the Australian Business Register (ABR) online services and select 'Update ABN record'. You will need to use your Digital ID, such as myID, and the Relationship Authorisation Manager (RAM). Changes made to your ABN online will take effect immediately.
When updating your ABN record, you will need to select the Australian and New Zealand Standard Industrial Classification (ANZSIC) and business details. You will then need to describe your business activity by typing a short description that best categorises your business activity. Next, select the drop-down menu and choose the category that best matches your business activity. The ANZSIC code and description will automatically update based on your selections.
In addition to updating your business activity, you can also update your business address, postal address, and any additional location addresses for your business. It is important to note that your main business address should not be a post office box or tax or BAS agent address. Make sure to check that all other contact information is current before submitting your updates.
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Frequently asked questions
You can find your ABN number by using the ABN Lookup tool. This free tool allows you to search for your ABN by entering your business name, ABN, or ACN. If your ABN doesn't show up, try checking your government documents, such as tax invoices or letters sent to your business.
ABN stands for Australian Business Number. It is a unique 11-digit number that identifies your business to the government, other businesses, and the public. You need an ABN to run a business in Australia, as it allows you to carry out commercial activities and legitimises your business.
If your ABN doesn't appear on the ABN Lookup tool, it may have been cancelled by the ABR due to inactivity. You can reactivate a cancelled ABN by re-submitting an online application. Alternatively, if you have simply misplaced your ABN, try checking your business documents, such as letterheads or tax invoices, as these commonly include your ABN.



























