Before you sign a purchase order or release a payment, there is one free verification available to every Australian business: enter the supplier's Australian Business Number (ABN) into ABN Lookup. It will not tell you whether the supplier is any good. It will tell you whether the entity exists on the register, whether that registration is current, what kind of entity it is, and whether it is registered for GST. Those four facts resolve most of the questions that catch businesses out at payment time.
This guide explains what the register actually tells you, how to read it against the invoice in front of you, the specific consequence that lands on you if the details do not match, and what to do next.
What ABN Lookup shows you
ABN Lookup provides free access to public ABN information from the Australian Business Register (ABR). According to ABN Lookup, you can use it to:
- check whether an ABN is active or cancelled
- see the business type
- see GST status
That is the whole tool, and it is enough to cover most buyer questions.
Equally important is what it does not do. ABN Lookup is a register search. It confirms registration. It is not a credit report, not a solvency check, not a licence check, not an insurance check, and not proof that the person emailing you is authorised to bind the entity. Treat it as one control among several, not as a substitute for the others.
To apply for, update or cancel an ABN, you go to the Australian Business Register rather than the lookup tool. If a supplier tells you its ABN is "being updated", that update runs through the ABR, not through ABN Lookup.
Are you actually required to check?
Direct answer: generally, no. The Australian Taxation Office (ATO) states that generally you do not need to check whether the ABN quoted to you by a supplier is correct.
Checking still earns its keep in two situations. First, the ATO says that if you suspect an ABN quoted to you is not correct, you can check it online or by phoning its self-help service. Second, the consequence of a bad ABN falls on you rather than the supplier, so a routine check is cheap insurance.
The consequence you need to know about
This is the part with money attached. Per the ATO, if the ABN quoted on the invoice is not valid, or the details do not match the supplier, you withhold from the payment at the top tax rate.
Read that carefully: the withholding obligation sits with the payer. You pay the supplier less, and you remit the withheld amount to the ATO. If you discover the mismatch after you have already paid in full, you have a problem that is now both administrative and relational. Discovering it before you pay is straightforward. That asymmetry is the entire commercial argument for building the check into onboarding rather than doing it ad hoc.
Verify with the ATO: the current top tax rate that applies when no valid ABN is quoted, and how to report and remit the withheld amount. Tax rates change through federal legislation. Do not rely on a figure quoted in any article, including this one.
How to run the check
- Open ABN Lookup at abr.business.gov.au.
- Search using the ABN printed on the quote or invoice. Prefer copying the number off the document — searching by a name typed from an email signature returns near-matches and creates doubt where none may be warranted.
- Read the record: status, entity or business type, registered and trading names, location, and GST status.
- Compare that record line by line against the invoice and against your contract or purchase order.
- If you still suspect the ABN is not correct, use the ATO's alternative channel — its self-help phone service — rather than treating your own reading of the screen as final.
- If the ABN you have been provided is wrong, the ATO says you can report it to the ATO. Check its page for the reporting channel currently in use.
Reading the result
| Field | What it tells you | If it looks wrong |
|---|---|---|
| Status | Whether the ABN is active or cancelled on the register | Do not treat a cancelled ABN as valid. Ask for a current one before paying. |
| Business type | Whether you are contracting with a sole trader, a company or another structure | If the contract says Pty Ltd but the record shows a sole trader, the legal party is not who you think it is. Resolve before signing. |
| Registered and trading names | The names held on the register | Trading names legitimately differ from legal names, but the gap should be explicable. Ask the supplier to confirm in writing. |
| GST status | Whether the entity is registered for GST | Compare against the invoice. If GST is charged and the record does not support it, query before paying and before claiming anything. |
| Location | Where the entity is registered | Context only. A gap between that state and where work is performed is a prompt to ask a question, not evidence of anything. |
Sorting facts from judgement
Facts from the official sources:
- ABN Lookup gives free access to public ABN information from the Australian Business Register.
- It can show whether an ABN is active or cancelled, plus business type and GST status.
- The ATO states that generally you do not need to check an ABN quoted to you by a supplier.
- If the invoice ABN is invalid or the details do not match, you withhold from the payment at the top tax rate.
- Applying for, updating or cancelling an ABN is done through the ABR.
Our practical interpretation, not an official statement:
- Checking before first payment carries less risk than discovering a mismatch afterwards, because the withholding obligation lands on you.
- The three mismatches worth delaying a payment over are a cancelled status, a business type that contradicts the contract, and a GST status that contradicts the invoice.
- A single clean ABN record is weak evidence on its own. Combine it with licence, insurance and reference checks where the work warrants them.
Questions you should verify yourself, because they change or depend on your circumstances:
- The current top tax rate for no-ABN withholding and how to remit it, on ato.gov.au.
- Invoicing requirements for a valid tax invoice, and your entitlement to claim GST credits.
- Your obligations where a supplier is overseas, or quotes an ABN belonging to a different entity type than the one performing the work.
- Licensing, insurance and professional registration, which sit with other regulators and registers entirely.
When a supplier has a stale or cancelled record
According to the ABR, it may contact an ABN holder about an ABN entitlement review, or because it has identified the ABN as potentially inactive. The ABR also notes that accurate ABN details help government agencies confirm identity and check eligibility for grants and emergency support — one reason a lapsed record is more often neglect than intent.
Practically: ask for a current ABN, set a short deadline, and hold payment until it arrives. Updating or reapplying runs through the ABR. If the supplier cannot produce a valid, matching ABN at all, do not resolve that by paying anyway and hoping. Confirm your withholding obligation and remittance process with the ATO first.
Before you pay: a short checklist
- [ ] ABN copied from the invoice, not retyped from memory
- [ ] Status reads active, not cancelled
- [ ] Business type matches the entity named in the contract or purchase order
- [ ] Name on the register is the name on the invoice, or a trading name the supplier confirms in writing
- [ ] GST status matches what the invoice charges
- [ ] Bank account name matches the entity name, or the difference is explained in writing
- [ ] Search date and result saved to the supplier file
- [ ] Any unresolved mismatch dealt with before payment rather than after
That bank-account line is our own fraud-prevention suggestion, not an ABN requirement. Invoice-redirection scams are common enough that reconciling the payee name against the register name is worth thirty seconds.
Next steps
- Pull the last three supplier invoices you paid and check each ABN now. Any cancelled status or name mismatch is worth raising before the next payment run, not after.
- Where you find a mismatch, ask the supplier in writing to confirm its current ABN and reissue the invoice. Do not pay against a document you cannot reconcile to the register.
- If the ABN you were given is wrong, the ATO says you can report it — use the channel it currently nominates.
- Move the check upstream. Collect the ABN alongside bank details during supplier onboarding rather than chasing it once an invoice arrives.
- Confirm the current top tax rate and remittance process with the ATO before withholding anything.
General information only
This article is general information about Australia's business register, published by Australian Ltd as an independent information site. It is not legal, tax, accounting or financial advice and is not tailored to your circumstances. It draws on publicly available information from the ATO and the Australian Business Register as at the date shown.
Australian Ltd is not the ATO, not the Australian Business Register, and not any government agency, regulator, lender, broker or comparison service. We do not issue, cancel or verify ABNs, and ABN Lookup is operated by the register rather than by us. Register details and tax rates change over time. Confirm current requirements on ato.gov.au and abr.gov.au, or with a registered tax agent or adviser, before acting on anything here.