- ABNs don’t expire but they can be cancelled.
There’s no fixed expiry date, but the ABR can cancel your ABN if you’re no longer carrying on an enterprise or meeting your reporting obligations. - Cancellation is based on business activity.
The ABR reviews ABNs using reporting data and other activity indicators. If there are no clear signs you’re carrying on an enterprise, your ABN may be cancelled. - Compliance keeps your ABN secure.
Timely lodgements, accurate details, and ongoing commercial activity are what protect your ABN from review or cancellation.
Do ABNs expire? It’s a common question for Australian business owners, especially after completing their business registration and assuming their ABN is permanent.
The short answer: ABNs don’t technically expire. But they can be cancelled by the Australian Business Register (ABR). In practice, that can feel just as disruptive as an expiry date.
In this guide, we’ll explain how long an ABN lasts, what triggers cancellation, and what you need to do to keep your ABN active and compliant. By the end, you’ll know exactly how to protect your business identity and avoid unexpected disruptions.
Keep your ABN details and lodgements up to date. Updating your details within 28 days and lodging required tax returns or BAS (including nil where needed) are the simplest ways to show the ABR your business is still active.
Do ABNs expire? Here’s the straight answer
No, ABNs do not expire.
There is no fixed expiry date for an Australian Business Number.
Your ABN remains active as long as you are carrying on an enterprise and meeting your reporting obligations. However, it can be cancelled if the Australian Business Register believes your business is no longer operating.
Key points:
- No expiry date: Your ABN is valid indefinitely while you’re actively carrying on a business in Australia.
- Unique identifier: It’s a 11-digit number issued to your business by the Australian Business Register, managed by the Australian Taxation Office (ATO).
- Business-specific: Australian Business Number stays with you for the life of that specific structure, making it a cornerstone of business government interaction.
- Compliance: ABN is a key part of Australia’s business and tax system and is essential for being legally compliant.
- Business identity: Your ABN is more than just a number; it’s your business’s identity in the eyes of the government and other businesses.
Read our full guide on what is ABN and why your business need it?
Why can an ABN be cancelled?
Here’s where the confusion often begins for many Australian businesses. Although an ABN doesn’t expire, it can certainly be cancelled. The ABR conducts regular reviews to make sure the information on the business register is correct and up to date.
Why?
- To ensure the register only reflects businesses currently operating in Australia.
- If their records suggest you have stopped your business activities, they may cancel your ABN. This decision is based on your business activity, not a specific date on a calendar.
Why does this process matter?
- Maintain the integrity of the ABR and the overall business legally compliant framework.
- Prevents the misuse of ABNs by individuals or entities who are no longer active or no longer carrying on an enterprise.
What triggers an ABN review? 4 common reasons
The ABR uses several indicators to determine if a business is still active. If your ABN is flagged for review, it’s likely due to one or more of these reasons. Staying aware of them is the best way to keep your ABN active.
1. Lack of business activity
The most significant trigger for an ABN review is a lack of reported business activity. The ABR and the Australian Taxation Office share data, so your tax records are a key source of information. If you haven’t reported any business income in your tax return for an extended period, it’s a major red flag that you are no longer operating.
The government looks for signs that you are genuinely carrying on an enterprise, which is a key part of your ABN registration.
Key points:
- Simply holding an ABN is not enough; you need to be actively engaged in business activities.
- You’ll need to invoice clients, advertise for work, or purchase business assets.
- If there are no signs of business activity such as income reported in tax returns or required lodgements, the ABR may review and cancel your ABN if it appears you are no longer carrying on an enterprise.
- An inactive ABN can be flagged for cancellation, as it is no longer active, even if you intend to restart the business later.
2. Failing to meet tax obligations
Another major sign that your business might be dormant is a failure to meet your tax returns and other lodgement duties. This goes beyond just declaring income; it’s about participating in the Australian taxation system as a whole.
If you’re registered for Goods and Services Tax (GST), you must lodge regular Business Activity Statements (BAS). Not lodging your BAS or your annual income tax returns tells the ATO that you may no longer be in business.
Key points:
- Lodge all tax returns and BAS timely, even if your business has no income.
- Submit nil lodgements when there’s no activity. This confirms you’re still active, just in a quiet quarter or year.
- Consistently failing to lodge is a strong signal to government agencies that your business may be inactive.
- Staying on top of your lodgements keeps you compliant and prevents ABN cancellations.
3. Your business structure changes
Many businesses evolve over time, and your business structure might change with it. For example, you might start as a sole trader and later decide to register as a company. This is a very common path for a growing Australian business.
Read more: Sole Trader Business Structure vs Company: Which is Right for you in Australia?
Key points:
- When you make this change, your original sole trader ABN becomes redundant.
- A company is a separate legal entity and requires its own unique business number.
- You cannot simply transfer your sole trader ABN to your new company.
In this situation, you are required to request an ABN cancellation for your original number. If you don’t, the ABR may eventually cancel it for you after noticing the new ABN for your company is active while the old one shows no activity or business details.
4. Inaccurate ABN details
The details linked to your ABN must be current. This includes your business address, business location, and contact information. The ABR relies on this information to communicate with you.
If the ABR attempts to contact you for a review and the mail is returned to sender or emails bounce back, it is a strong indicator of an inactive ABN. They may conclude that the business is no longer active at the recorded location. This is why you must update ABN details within 28 days of any change.
Not sure if your ABN needs a review?
How the ABR can cancel your ABN
The ABR will generally attempt to contact you before cancelling your ABN, but cancellation decisions are based on whether you are still carrying on an enterprise. The ABR regularly reviews ABNs using tax data and other activity indicators to ensure the register remains accurate.
Here’s how the process typically works:
Step 1: Attempt to contact you
The ABR may reach out using the contact details listed on the Australian Business Register via email, phone or post. This is why keeping your ABN details current is essential.
Step 2: Opportunity to confirm
If contacted, you’ll have the opportunity to confirm that you are still operating and that your ABN should remain active. If you can demonstrate ongoing business activity, your ABN will generally remain on the register.
Step 3: No response or confirmation of closure
If you don’t respond, or you confirm that you’ve stopped carrying on an enterprise, the ABR may proceed with cancelling your ABN.
Step 4: Public status update
Once cancelled, the ABN Lookup tool will show the status as “Cancelled.” This information is publicly visible to clients, suppliers and lenders.
Pro tip: Always keep your ABN details current so you never miss a review notice.
Read our step-by-step guide to cancelling your ABN, whether you’re an individual or running a business.
What happens if my ABN is cancelled?
Having your ABN cancelled can cause some serious problems for your business. It’s not just an administrative issue. The consequences can affect your cash flow, your ability to trade, and your professional credibility.
Here are some of the main issues you could face:
1. Withholding tax
If you do not quote a valid ABN when supplying goods or services, businesses paying you are generally required to withhold tax from the payment and remit it to the ATO.
- Under PAYG withholding rules, this typically applies to payments over $75 (excluding GST), unless an exception applies.
- The withholding rate is the top marginal rate, currently 47%.
This can significantly impact your cash flow, as you’ll receive less upfront and must claim the withheld amount back through your tax return.
2. GST consequences
If you were registered for GST, a cancelled ABN means you can no longer charge GST on your sales or issue valid tax invoices.
You also cannot claim GST credits on business purchases from the date your registration is cancelled, which may increase your effective costs.
3. Domain name eligibility
Many .com.au domain registrations rely on an active eligibility basis, commonly an ABN or ACN.
If your ABN is cancelled and you no longer meet eligibility requirements, you may risk losing your domain name, a critical asset for many businesses.
4. Loss of credibility
Clients, suppliers and lenders often use the ABN Lookup tool to verify that a business is active.
A cancelled ABN may damage your professional reputation and could affect your ability to trade on standard business terms.
5. Legal compliance
If you are required to have an ABN because you are carrying on an enterprise, operating without one may expose you to compliance risks. A cancelled ABN may indicate that your business is no longer recognised as actively operating for registration purposes.
These outcomes show how important it is to maintain an active ABN while you are carrying on a business in Australia.
3 ways to keep your ABN active
Preventing your ABN from being cancelled is quite straightforward. It comes down to good business administration and meeting your government obligations. You just need to show the ABR that you are still here and still in business.
Step 1: Keep your details up to date
This is perhaps the most important step you can take. You are legally required to update your ABN details within 28 days of any change. This includes your business address, contact person, and contact information, ensuring your details are updated.
If the ABR can’t reach you for a review, they have little choice but to assume you are no longer operating. A simple update can prevent a lot of future headaches. You can update ABN details online through the ABR website, through your registered tax agent, or via your myGovID.
Step 2: Meet your tax obligations
Always lodge your tax returns and Business Activity Statements on time. This is the clearest proof you can offer the ATO and ABR that your enterprise is active. It’s a non-negotiable part of doing business legally in Australia.
As mentioned earlier, lodge even if you have no income or activity to report for a certain period. Filing a nil return tells the system you’re still in the game. It is a positive action that confirms your ongoing business operation to the Australian Taxation Office.
Step 3: Demonstrate ongoing business activity
At its heart, an ABN is for an active business. Continue to engage in commercial activities like marketing your services, sending quotes, issuing tax invoices, and earning income. Keeping good legal documents and business records is evidence of this activity.
If you’re taking a temporary break from your business, you should consider if it’s better to keep the ABN. If it is a short break, lodging nil returns may be fine. For a long, indefinite break, you should use the ABN cancel function yourself and re-apply when you’re ready to start again.
Here is a quick reference table:
| Actions to keep your ABN active | Actions that risk ABN cancellation |
|---|---|
| Update your ABN details within 28 days of a change. | Failing to update your business address or contact details. |
| Lodge all tax returns and BAS on time, even if they are nil. | Failing to lodge required tax returns or BAS over an extended period. |
| Regularly issue invoices and quote for work. | No recorded business income for an extended period. |
| Maintain business records and legal documents. | Ceasing all business activities indefinitely. |
| If your business structure changes, apply for a new ABN and cancel the old one. | Using an old sole trader ABN after incorporating as a company. |
Many ABN cancellations happen unintentionally not because businesses fail, but because owners assume registration alone is enough. An ABN is conditional on ongoing enterprise activity.
What if my ABN is never used?
It’s common for someone registering business credentials to get an ABN with plans for a side hustle that never gets off the ground. What happens in that situation? Does an ABN expire if it sits unused from day one?
- The ABN itself does not expire due to a time limit.
- However, an ABN that has never been used to generate income or report activity will almost certainly be cancelled.
- The ABR system is designed to identify and remove ABNs that aren’t tied to an active enterprise.
If you registered an ABN but your plans changed, the best approach is to request an ABN cancellation yourself. This is part of your obligation and keeps the business register clean and accurate. You can always apply for another one if you decide to start a business later, and it won’t be held against you.
Not sure if your ABN is still active?
How to reapply for a cancelled ABN
What if your ABN was cancelled, either by you or by the ABR, and you now need it again?
The good news is that you can get back on track. You can’t technically reactivate ABN status, but you can apply for a new one with a step-by-step guide from the ABR.
- The process is the same as when you first applied for ABN registration.
- You’ll need to prove you’re entitled to an ABN again by demonstrating that you’re starting or carrying on an enterprise.
- You can do this on the ABR website.
In many cases, if your business details and structure are identical to before, you may be re-issued your previous ABN.
- This helps maintain consistency for your business, but this is not guaranteed.
- If you’re unsure about the process or your eligibility, seeking legal advice is recommended.
If your ABN is cancelled and you’re still eligible, you can reapply and in some cases, the same number may be reissued if your structure hasn’t changed.
How Sleek can help you keep your ABN active
Not sure if your ABN is still active? Had it been cancelled unexpectedly? Or simply want to make sure you never lose it in the first place? Sleek has you covered at every stage.
- Unsure about your ABN status? Our experts quickly check it for you and let you know if action is needed.
- ABN cancelled? We handle the entire reapplication process so you can get back to business without the stress.
- Peace of mind: Stay on top of BAS, tax lodgements, ABR updates, proof of activity requirements, so you never miss a deadline again.
- Ongoing compliance: Get flagged on any risks that could trigger ABN review or cancellation before they happen.
- Need to apply for an ABN? The entire application process from gathering documents to lodging your application is managed by our dedicated experts, ensuring you start off right.
Don’t risk a cancelled ABN. Speak to our experts and get clarity today.
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Frequently Asked Questions
How long does an ABN last in Australia?
An ABN does not have a fixed expiry date. It remains active as long as you are carrying on an enterprise and meeting your reporting and compliance obligations. If there are no signs of business activity, the ABR may review and cancel it.
How do you check if your ABN is active?
You can check your ABN status using the free ABN Lookup tool on the Australian Business Register website. Enter your ABN or business name to see whether your ABN is active or cancelled, along with the effective dates and registered details.
Can you reactivate a cancelled ABN?
If your ABN has been cancelled, you generally need to reapply through the Australian Business Register. In some cases, if your business structure and details remain unchanged, you may be reissued the same ABN. Approval depends on whether you are entitled to hold an ABN and are carrying on an enterprise.
