How to check an ABN and what it actually tells you

Three things to check on any invoice before you pay it: does the ABN belong to the business you're dealing with, is it still active, and does the entity type match what you were told (sole trader, company, or something else). Each takes under a minute on ABN Lookup, and skipping the check is how people end up paying a business that no longer legally exists.

What ABN Lookup shows you

ABN Lookup is the free public search of the Australian Business Register, run by the Australian Taxation Office. Go to the site, enter the 11-digit ABN (or the business name if that's all you have), and the result page returns a standard set of fields for that entity, as at 2026.

The fields that matter for a quick trust check are:

• ABN status: Active or Cancelled. An active ABN means the entity is currently registered. A cancelled ABN means it isn't, which is a reason to stop and ask questions before paying.
• Entity type: whether you're dealing with an individual/sole trader, an Australian private company, a partnership, a trust, or another structure from the ABN Lookup entity type list.
• Goods & Services Tax (GST): whether the entity is currently registered for GST, and from what date, per the ABN Lookup glossary.
• Main business location: the state or territory the ABN is registered against, useful for confirming a trade is actually local rather than interstate or overseas.
• Business name(s): any trading names registered against the ABN, which you can match against the name on the invoice or quote.

None of these fields confirm the quality of the work, the accuracy of a quote, or whether the business is insured. They confirm registration status only.

Why an active ABN matters when you're paying an invoice

If a supplier doesn't quote an ABN on an invoice and the payment for goods or services is more than $75 excluding GST, the payer is generally required to withhold the top rate of tax from that payment and send it to the ATO, per the ATO's guidance on withholding if an ABN isn't provided. This is the "no-ABN withholding" rule, and it's the main reason businesses insist on a valid ABN before paying a contractor or supplier.

For a homeowner hiring a tradesperson, no-ABN withholding usually isn't your problem in the same way it is for a business paying suppliers, but a missing or invalid ABN is still a red flag. A legitimate operating business registers for an ABN as a basic step, per business.gov.au's ABN registration guidance. If the ABN on a quote doesn't check out, that's worth a phone call before you pay a deposit. For what else you're entitled to before and after paying, see consumer rights when hiring a tradie.

GST registration: what it does and doesn't tell you

A business must register for GST once its annual turnover reaches the ATO's threshold, and can register voluntarily below that, according to the ATO's page on registering for GST. GST registration on an ABN Lookup result tells you the entity is charging GST on its invoices and lodging activity statements. It does not tell you the business is large, well established, or reliable. Plenty of small, perfectly legitimate operators register for GST early because it lets them claim GST credits on tools and materials.

If an invoice includes GST but the ABN Lookup result shows the entity isn't currently registered for GST, that's a mismatch worth asking about directly.

ABN vs ACN: what's the difference

An ACN (Australian Company Number) is a unique 9-digit number ASIC issues when a company is registered under the Corporations Act. An ABN (Australian Business Number) is an 11-digit number the Australian Business Register issues to any entity conducting a business, including sole traders, partnerships, trusts and companies, for use in tax dealings with the ATO and other businesses.

When a registered company applies for an ABN, the ABN is built from its ACN, with two extra digits added at the front. So a company has both numbers, and its ABN and ACN are directly linked. A sole trader or partnership has an ABN but no ACN, because there's no company to register with ASIC.

Sole trader vs company: what it means if something goes wrong

The entity type field on your ABN Lookup result tells you what kind of legal structure you're dealing with, and that structure determines your recourse if the work is faulty or the business folds.

A sole trader is the individual named on the ABN. They are personally liable for the debts and obligations of the business, per the ATO's guidance on business structures. There's no legal separation between the person and the business, which in practice means a court judgment against the business is a judgment against that individual's personal assets.

A company (shown as "Australian Private Company" or similar in the entity type field) is a separate legal entity from the people who run it. If a company that did faulty work is deregistered or wound up, chasing the individual directors for money is harder, and in some cases impossible, because the company's debts don't automatically become the directors' personal debts. This is worth knowing before you hire: a company structure can mean less personal recourse for you as the customer if things go wrong, not more protection for you.

Neither structure is inherently safer to deal with. What matters is that you know which one you're dealing with, and that you keep records (quotes, invoices, contracts) that name the correct legal entity, not just a trading name.

An ABN is not a licence, and it's not insurance

This is the most common misreading of an ABN Lookup result. An active ABN confirms the entity is registered for tax purposes. It says nothing about:

• Trade qualifications or a state building/trade licence
• Public liability or professional indemnity insurance
• Membership of an industry association
• A clean record with a state fair trading or consumer affairs regulator

For trades and building work, checking the ABN is step one, not the whole job. See our guide on checking a builder's licence by state for how to verify the licence itself, which is issued separately by each state regulator and is what actually confirms qualifications and insurance eligibility. The same principle applies across trade services generally, and to bigger jobs listed under home builders: an ABN check is a starting filter, not proof the operator is licensed, insured, or any good.

Frequently asked questions

Is an ABN the same as a business licence?

No. An ABN registers an entity for tax purposes with the Australian Business Register. It says nothing about trade qualifications, building licences, or professional registration, which are issued separately by state regulators.

Can I check an ABN without giving my own details?

Yes. ABN Lookup at abr.business.gov.au is free and anonymous. You enter the ABN, ACN, or business name and get results instantly with no login.

What does it mean if an ABN shows as cancelled?

A cancelled ABN means the entity is no longer registered in the Australian Business Register, often because the business closed, restructured, or was deregistered. Do not pay an invoice quoting a cancelled ABN without asking why.

Does GST registration mean a business is bigger or more trustworthy?

Not necessarily. GST registration is compulsory once turnover reaches the ATO threshold, but many smaller businesses register voluntarily. It confirms tax status, not size, quality, or reliability.

What's the difference between an ABN and an ACN?

An ACN is a 9-digit number ASIC issues when a company is registered. An ABN is an 11-digit number the Australian Business Register issues to any entity, including companies, for tax dealings. A registered company's ABN embeds its ACN as the last 9 digits.

Sources

• ABN Lookup
• ABN Lookup — Entity types
• ABN Lookup — Glossary
• ATO — Withholding if ABN is not provided
• ATO — Registering for GST
• ATO — Business structures, key tax obligations
• ASIC — Australian Company Number (ACN)
• business.gov.au — Register for an ABN