ABN cancellation in Australia: why it happens and what to do

An ABN does not expire on its own. But the Australian Taxation Office can cancel it if it believes you are no longer carrying on an enterprise, your business details are out of date, or you have not met your lodgement and reporting obligations.

If your ABN has been cancelled, you can usually reapply. If you want to prevent cancellation, the key is keeping your ABR details current and your tax obligations up to date. And if you want to cancel your own ABN because your business has closed, you can do that through the Australian Business Register. If you are applying for an ABN for the first time or reapplying after cancellation, the process is the same.

This guide covers why ABN cancellations happen, how the ATO process works, how to prevent it, what to do if it has already happened, and how to cancel your ABN voluntarily.

At a glance

• An ABN does not expire, but the ATO can cancel it if you are no longer entitled to hold one.
• The most common reasons are inactivity, non-lodgement of tax returns or BAS, and outdated ABR details.
• The ATO follows a process before cancelling: contact attempt, formal notice, objection period, then cancellation.
• If your ABN is cancelled, you can reapply through the ABR at abr.gov.au.
• Without an active ABN, clients may withhold 47% from payments, your GST registration ends, and you cannot issue valid tax invoices.
• If your business has closed, you can cancel your own ABN through the ABR.
• A registered tax agent can help with reinstatement and outstanding lodgements.

Why the ATO cancels ABNs

The ATO and the Australian Business Register review ABN records and cancel those that no longer meet registration requirements. The ABR's cancellation program is designed to keep the register accurate, because government agencies and emergency services use ABR data for economic planning and disaster relief.

Your ABN may be cancelled if:

• You have not reported business income in your tax return for an extended period.
• You have not lodged activity statements that include business income.
• There are no signs of business activity in other lodgements or third-party information.
• Your ABR contact details are outdated and the ATO cannot reach you.
• ASIC has deregistered your company.
• Your business structure has changed (for example, switching from sole trader to company) and the old ABN is no longer valid.
• You obtained the ABN incorrectly or it was issued in error.

The ATO looks at several data sources to identify inactive ABNs, including tax returns, BAS lodgements, Single Touch Payroll data and ASIC records. If you run multiple businesses under one ABN, all of them are affected if that ABN is cancelled. For more on how ABNs relate to business structures, see can a business owner have multiple ABNs.

How the ATO cancellation process works

The ATO does not cancel an ABN without warning. There is a defined process.

1. Issue identified. The ATO identifies a potential problem through data matching against tax returns, BAS, payroll or ASIC records.
2. Contact attempt. The ATO writes to you at the address on the ABR. If your details are wrong, you may not receive this letter.
3. Notice of intended cancellation. The ATO publishes a notice in the Government Gazette and writes to you directly. This is the formal warning.
4. Objection period. You have the right to object. You typically have 28 days to respond with evidence that you are carrying on an enterprise.
5. Cancellation. If you do not respond or your response does not satisfy the ATO, your ABN is cancelled and removed from the ABR.

If you are still running a business, the fastest way to respond is often the automated phone service number provided in the ATO's letter. Other methods of contact may not be received in time.

How to prevent your ABN from being cancelled

Most cancellations happen because the ATO cannot see evidence that you are carrying on a business. Keeping your records current is the simplest way to avoid this.

Keep your ABR details up to date. Your business address, contact details and the nature of your business activities must be accurate on the ABR. If the ATO sends a letter and it bounces, the cancellation process continues without you. You can update your details at abr.gov.au or through your registered tax agent.

Lodge your BAS and tax returns on time. Non-lodgement is one of the strongest signals the ATO uses to identify inactive ABNs. Even if your business income is zero in a period, lodge a nil BAS or return. A nil lodgement shows the ATO that your business is still active. Skipping a lodgement because there is nothing to report is one of the most common paths to an ABN review.

Report business income in your tax return. If you are a sole trader, include the business and professional items schedule in your individual tax return. If you earn business income but do not report it, the ATO has no way to confirm your business is operating. For more on how ABN income is taxed, see our guide to tax implications with an ABN.

Respond to ATO correspondence promptly. If the ATO writes to you about your ABN status, respond within the timeframe given. Ignoring the letter is the most common path to cancellation.

Review your GST registration. If you are registered for GST, make sure you are lodging your BAS. If your turnover has dropped below the GST threshold and you no longer need GST registration, cancel the registration but keep your ABN active.

What to do if your ABN has been cancelled

If your ABN has already been cancelled and you are still running a business, act quickly. Without an active ABN, other businesses are required to withhold 47% from payments they make to you. Your GST registration ends automatically, which means you can no longer claim GST credits or lodge BAS. You cannot issue valid tax invoices, and a public ABN lookup will show your business as inactive.

1. Check your ABN status. Search the public ABR at abr.gov.au to confirm whether your ABN is active or cancelled. Note the cancellation date and entity type.
2. Log in to ATO online services. Check whether there are unpaid obligations or outstanding lodgements. The ATO may have cancelled your ABN because of non-lodgement, so resolving those issues first can help with your reapplication.
3. Gather evidence of business activity. If the cancellation happened because the ABR believed you were not carrying on an enterprise, you will need to show that your business is real and operating. This can include invoices, contracts, client correspondence, a business website, marketing materials or bank statements showing business transactions.
4. Reapply through the ABR. You can list your previous ABN when you reapply for a new one. Reactivating a cancelled ABN through the ABR is free, but you may be charged a fee if your business name needs to be re-registered with ASIC.
5. Expect a review. The ATO may conduct a manual review when you reapply after a cancellation. This review checks whether you are carrying on an enterprise and whether you are entitled to an ABN.
6. Consider engaging a tax agent. A registered tax agent can lodge outstanding returns, respond to the ATO on your behalf and help with the reinstatement process. If your cancellation involves non-lodgement or compliance issues, professional help can speed up the process.

How to cancel your own ABN

If your business has permanently closed and you want to cancel your ABN voluntarily, you can do this through the Australian Business Register at abr.gov.au using your myGovID linked through the Relationship Authorisation Manager (RAM). You can also ask a registered tax or BAS agent to handle the cancellation on your behalf.

Before cancelling, make sure you have met all outstanding obligations:

• Lodge any remaining BAS and activity statements.
• Lodge your final tax return including business income.
• Submit any outstanding PAYG withholding reports.
• Pay any remaining tax debts.
• Cancel your GST registration if you are registered.
• Notify clients, suppliers and any platforms you trade on.

Once your obligations are met, cancel your ABN through the ABR portal. Your GST, Luxury Car Tax, Wine Equalisation Tax and Fuel Tax Credits registrations end automatically when your ABN is cancelled. Keep all business records for at least five years after cancellation, because the ATO can review them during that period. If you are unsure which registrations to cancel and which to keep, a tax agent can advise.

Do ABNs expire?

No. An ABN does not have an expiry date. Once issued, it remains active until it is cancelled by the ATO or by you. However, the ATO can cancel an ABN at any time if it determines you are no longer entitled to hold one. Keeping your lodgements current and your ABR details accurate is what keeps your ABN active.

Is that ABN cancellation message legitimate?

The ATO does contact businesses about ABN cancellations, usually by letter to the address on the ABR. In some cases the ATO may also use email or SMS. However, scam messages are common. If you receive a phone call, text message or email saying "your ABN will be cancelled unless you phone us" or asking for payment to keep your ABN active, be cautious.

The ATO will never ask you to pay a fee to prevent ABN cancellation. The ATO will never ask for credit card details, passwords or financial information over the phone or by text. If you are unsure whether a message is genuine, do not respond to it. Instead, contact the ATO directly on 13 28 66 or check your ABN status at abr.gov.au.

How ABN cancellation can affect your business insurance

If your ABN is cancelled, your business insurance can be affected. Most business insurance policies are issued to a specific ABN entity. If that ABN is no longer active, the insurer needs to be notified, and the policy details will likely need to be updated.

If you reapply for an ABN and receive a new one, contact your broker or insurer to confirm that your policy is linked to the correct ABN. If your business name changes or your business structure changes (for example, from sole trader to company), the new entity will have a different ABN and may need a separate policy.

upcover arranges insurance for eligible Australian businesses, including public liability, professional indemnity, business pack and other cover, subject to policy terms and conditions. If your ABN status changes, contact upcover or your broker to check whether your existing cover is affected.

Frequently asked questions

Why was my ABN cancelled?

The ATO cancels ABNs when it believes you are no longer carrying on an enterprise. Common reasons include non-lodgement of tax returns or BAS, no reported business income, outdated ABR contact details, or ASIC deregistering your company. The ATO will usually attempt to contact you before cancelling.

Can I get my ABN back after cancellation?

Yes. You can reapply for an ABN through the Australian Business Register at abr.gov.au. You can list your previous ABN on the application. The ATO may conduct a manual review to confirm you are entitled to an ABN. Resolving any outstanding lodgements before you reapply can help. If your business structure has changed, you may need a new ABN for the new entity rather than reactivating the old one. See can a business owner have multiple ABNs for more on how ABNs relate to business structures.

Do ABNs expire?

No. An ABN does not have an expiry date. It remains active until it is cancelled by the ATO or by you. However, the ATO can cancel an ABN if it determines you are no longer entitled to hold one.

How do I cancel my own ABN?

You can cancel your ABN through the Australian Business Register at abr.gov.au. Before cancelling, make sure you have lodged all outstanding returns, paid any remaining tax debts and cancelled your GST registration if applicable.

Can a tax agent help with ABN cancellation or reinstatement?

Yes. A registered tax agent can lodge outstanding returns on your behalf, respond to the ATO about your ABN status and assist with the reapplication process. If your cancellation involves non-lodgement or compliance issues, a tax agent can help resolve them.

How long do I have to respond to an ATO cancellation notice?

You typically have 28 days to respond to a notice of intended ABN cancellation. The fastest way to respond is usually the automated phone service number provided in the ATO's letter.

Does ABN cancellation affect my business insurance?

It can. Business insurance policies are usually issued to a specific ABN entity. If your ABN is cancelled and you receive a new one, contact your broker or insurer to confirm the policy is linked to the correct ABN. If your business structure changes, the new entity may need a separate policy.

Is "your ABN will be cancelled unless you phone us" a scam?

It may be. The ATO contacts businesses about ABN cancellations by letter, not by text message or unsolicited phone call. The ATO will never ask for payment to prevent cancellation. If you are unsure, do not respond. Contact the ATO directly on 13 28 66 or check your ABN status at abr.gov.au.

How do I check if my ABN is still active?

Search the public Australian Business Register at abr.gov.au. Enter your ABN or business name and the register will show your current status, entity type and registration dates.

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_{The information in this article about ABN cancellation and ATO processes is general in nature and drawn from publicly available sources. It does not constitute tax, legal or business advice. Always consult a registered tax agent or accountant for advice specific to your situation. All insurance products arranged through upcover are subject to the terms, conditions, limits and exclusions contained in the relevant policy wording and Product Disclosure Statement. Before deciding whether a particular insurance product is right for you, please read the relevant PDS and consider your personal circumstances. upcover Pty Ltd ABN 17 628 197 437 is a Corporate Authorised Representative (CAR 1299211) of Experience Insurance Services Pty Ltd ABN 41 657 596 506, AFSL 539078. upcover arranges insurance products with selected insurers and underwriters and does not compare all general insurers or insurance products available in the market.}