Explainer · Corporate
The Australian Business Register, Explained
Published 11 Aug 2026
What ABN Lookup tells you — and what it does not — before you contract, invoice or extend credit.
In short: The Australian Business Register (ABR) is the Commonwealth register of ABN holders, maintained by the Registrar of the ABR within the Australian Taxation Office. Its public face is ABN Lookup, and a two-minute search there tells you who you are really dealing with.
What the ABR records
- The ABN and its status (active or cancelled), with effective dates.
- The entity's legal name, and its entity type — individual/sole trader, Australian private company, discretionary trust, partnership, or other.
- GST registration status and the dates it applied.
- Registered business names linked to the ABN.
- Main business location, shown at postcode and state level.
- For charities, endorsement status such as deductible gift recipient endorsement.
The ABR does not record directors, shareholdings, financials, licences or credit history. For company officeholders and share structure you need the ASIC register; for security interests over assets, the PPSR.
Why we search it before every engagement
Most contract disputes we see involving the wrong party started with a name on an invoice that nobody checked. Three checks take minutes:
- Is the ABN active, and does the legal name match the entity you have been negotiating with? A trading name is not a legal entity. "Northside Fitouts" may be a business name held by a trustee company, a sole trader, or nobody at all.
- What entity type is it? A trust changes who signs and how, and often means the counterparty's assets sit elsewhere. A sole trader means personal liability — useful when you are the one owed money.
- Is it registered for GST? If it is not, an invoice charging GST is wrong, and you cannot claim the credit.
ABN withholding — the practical consequence of no ABN
If a supplier does not quote an ABN on an invoice for a supply made in carrying on an enterprise, the payer is generally required to withhold at the top marginal rate and remit it to the ATO. That obligation sits with the payer, not the supplier, which is why accounts teams should not simply pay an invoice with no ABN on it. Limited exceptions apply, including where the supply is private or domestic or the payment is below the statutory threshold.
Keeping your own ABR details current
ABN holders are required to keep their details up to date, generally within 28 days of becoming aware of a change. In practice the entries that matter most are the postal and email address for ATO correspondence, the authorised contact, and your ANZSIC industry code. Out-of-date contact details are a recurring cause of missed ATO notices — and the Registrar has been progressively cancelling ABNs that show no sign of an active enterprise.
Where the ABR fits with the other registers
- ABR / ABN Lookup — who holds an ABN, entity type, GST, business names.
- ASIC registers — company registration, ACN, directors, shareholders, business name holders, and licence registers including AFS licensees and credit licensees.
- PPSR — registered security interests over personal property, including any general security agreement over the counterparty's assets.
- Land titles offices — registered proprietors of land, mortgages and caveats.
Together these four cover most of what we check on a business sale, a significant supply agreement, or before extending trade credit. Individually, none of them is enough.
Frequently asked questions
What is the Australian Business Register?
The Australian Business Register (ABR) is the Commonwealth register of ABN holders, maintained by the Registrar of the ABR within the Australian Taxation Office. It records who holds an ABN, their entity type, GST registration status, business names and trading location details.
What is the difference between the ABR and ASIC?
The ABR records ABN and tax-related registration details for all business entities, including sole traders and trusts. ASIC maintains the corporate register — company registration, directors, share structure and business names. A company appears on both.
How do I look up an ABN?
Use ABN Lookup at abr.business.gov.au. It is free and shows the entity name, ABN status, entity type, GST registration dates, main business location by postcode, and any registered business names — which is why it is a standard first step in counterparty checks.
Do I need an ABN to run a business in Australia?
You need an ABN if you are carrying on an enterprise in Australia. Without one, other businesses must withhold tax from payments to you at the top rate under the ABN withholding rules, and you cannot register for GST or issue valid tax invoices.
Can an ABN be cancelled?
Yes. The Registrar can cancel an ABN if the entity is no longer carrying on an enterprise, and does so periodically for inactive ABNs. If a counterparty's ABN shows as cancelled, treat it as a warning sign and confirm which entity you are actually contracting with.
Related reading
Talk to us
Legal built for counterparty checks.
Send us a note about what you're working on. We'll respond within one business day and, if we're a fit, book a free 15-minute consultation with a senior lawyer.