ABN Lookup is the free government search that lets anyone check whether an Australian business number is active, who holds it and whether that business is registered for GST. It sits on top of the Australian Business Register (ABR), and according to the ABR’s own FAQ, only businesses that hold an ABN appear in it, and only with the details they made public when they registered.
Most guides stop at “type the number and press search.” The questions people actually type into Google are more specific. What does an ACN lookup add? Why is there no phone number in the results? Is there an ABN login? Does Western Australia have its own search? This guide from News Protocol answers each of them in plain English, using ABR, ATO, Scamwatch and other sources, and it says so where the sources run out.
ABN Lookup Australia Today: What It Is and Who Uses It
An Australian business number is an 11-digit identifier. The ABR, which the tax office runs, issues it to anyone carrying on a business, whether that is a company, a sole trader, a partnership or a trust. ABN Lookup is the public window into that register. You do not need an account to use it, and the ABR describes the tool as free.
The people who use it fall into three groups. Small businesses check suppliers and contractors before paying them. Accountants and bookkeepers check that an invoice matches a real, registered entity. Software developers plug the register into invoicing and onboarding systems. The same record serves all three, which is why the exact fields it shows, and the ones it hides, matter so much.
Key Facts at a Glance
- ABN: 11 digits. According to Lawpath, the first two are check digits, and for a company the remaining nine are its ACN.
- ACN: nine digits, issued to companies. It appears on the ABR only when it is linked to an ABN.
- Cost: searching is free, and so is applying for an ABN through the ABR.
- Login: not needed to search. Changing or cancelling your own record does need an account.
- Contact details: none. The public record gives only the state or territory and postcode.
- GST threshold: $75,000 in GST turnover for most businesses, and $150,000 for non-profits, per the ATO.
- No-ABN withholding: 47% of a payment, unless an exception applies.
- Update deadline: within 28 days of a change in your ABN details.
How to Use ABN Lookup, Step by Step
The search itself is simple. Open abr.business.gov.au and enter one of three things: an ABN, an ACN or a name. An ABN or ACN search gives the most precise result. A name search is useful when all you have is a brand, but it can return several similar entities, so treat it as a shortlist and not an answer.
A few habits make the results more reliable:
- Start from the invoice. Search the ABN printed on the document in front of you, not the name on the logo.
- Try the legal name. If a trading name finds nothing, search the individual’s or company’s legal name. Lawpath advises this for anyone who cannot find a record.
- Remove filters. If you are hunting for an old or cancelled ABN, switch off any active-only filter. Cancelled records stay on the register with a cancellation date, according to Lawpath.
- Read the whole record. Check the status, the entity name, the entity type and the GST fields together. Any one of them can look fine while another does not.
For bulk work, the ABR’s ABN Lookup tools page offers downloadable tools. One runs multiple ABN or ACN searches at once. Another runs multiple name searches. An advanced version can return ABNs matching criteria such as a postcode.
What an ABN Lookup Record Shows
The ABR FAQ lists the public details a record can hold:
- The ABN and its status
- Entity names, business names and trading names
- The state or territory and postcode of the main business location
- An ACN, ARBN, ARSN or ARFN, where the entity has one
- GST registration
- Deductible gift recipient (DGR) registration
- Charity tax concessions
This list is also a list of what is missing. There is no street address, no director names, no financial information and no credit history. The record tells you that a registered entity exists. It does not tell you that the entity is any good.
Active or Cancelled: How to Read the Status
The ABR says an active ABN means the registration is current. A cancelled one has been deactivated and is no longer current. The record also shows the date the current status took effect, so you can see when a cancellation happened. That date matters if a supplier invoices you for work done after it.
Cancelled does not mean the business was dishonest. Owners cancel an ABN when they sell or close a business, and the ABR can cancel one when records suggest the holder is no longer carrying on a business. It also cancels an ABN when ASIC tells it a company has been deregistered, according to Registry. What a cancelled status does mean is that the entity should not be issuing tax invoices under that number.
Entity Name, Business Name and Trading Name
These three terms cause more mistakes than any other part of the record. The ABR glossary defines the entity name as the name on official documents and legal papers, and says it may differ from the business name. A business name is the name a business operates under. The glossary says you must register one if you run a business and do not trade under your own name.
The practical rule is to address quotes, contracts and payments to the legal entity named on the register. Sprintlaw’s guidance says to compare the supplier name on the invoice with the ABN record, and a mismatch is a reason to pause before paying.
Trading names are shifting too. Upcover reports that unregistered trading names stopped appearing on ABN Lookup from 1 November 2025, so only registered business names now show alongside the legal name. Because that comes from a secondary source, check the ABR before relying on it in a contract.
ACN Lookup and ABR Lookup: Clearing Up the Confusion
People often treat an ABR lookup and an ABN search as separate tools. They are not. The ABR is the register, and ABN Lookup is its public search. The ACN is a different identifier altogether. It is a nine-digit number for registered companies, issued through ASIC, according to Scrap.io.
Three points follow from that:
- An ACN lookup on the ABR works only if the ACN is linked to an ABN, as the ABR tools page explains.
- A company’s ACN does not change when it renames itself, according to Wikipedia’s ACN entry, so it is the more stable way to track a company across name changes.
- Sole traders and trusts have an ABN but no ACN, because they are not companies.
For companies, a second check is worth the minute it takes. CompanyData’s 2026 guide says companies must tell ASIC about most changes within 28 days, while ABN Lookup relies on details owners report themselves and can lag. When the two registers disagree, the company register is usually fresher.
ABN Lookup Contact Details: Why You Won’t Find a Phone Number
This is the biggest gap for anyone searching for ABN lookup contact details. The ABR FAQ is direct: under tax law, the public record contains only the information a business provided at registration, and that gives the state or territory and postcode, not an address, email address or phone number.
The design is deliberate. It protects the privacy of sole traders, many of whom run a business from home. It also means ABN Lookup confirms identity, not reachability.
If you need to contact a business, use the details on its invoice, contract or website, and verify them independently. Scrap.io makes the point that an active ABN does not prove a business is legitimate, solvent or easy to reach. If your own record is wrong, the ABR has a contact form for corrections.
ABN Login: When You Need an Account and When You Don’t
Searching needs no login. Managing your own ABN does. The ABR says you must update your details within 28 days of learning about a change, and its update guidance says changes made online take effect immediately. Your main business address should be a physical street address, not a post office box or an agent’s address.
Online access works through a Digital ID and the Relationship Authorisation Manager, according to the ATO’s page on cancelling registrations. If you have tried to “log in to ABN Lookup” and failed, that is why: the search is open to everyone, and the account sits behind the ABR’s online services.
ABN Registration: Who Can Apply, What It Costs and How It Works
Registering for an ABN is free. Upcover says there is no application fee and that approval is, in most cases, instant. You apply through the ABR, or through a registered tax or BAS agent, who may charge a fee, according to Aspire.
Eligibility turns on genuinely carrying on a business. Sole traders, contractors, freelancers, partnerships, companies and trusts can apply. Hobbyists and people doing occasional personal projects may not qualify. Before applying, decide on your structure, because the ABN is issued to that entity, and changing structure later usually means a new ABN.
- Sole traders apply under their own name and tax file number. Aspire says including the TFN often leads to instant approval.
- Companies need to be registered first, and the company’s ACN underpins its ABN.
- Business names are separate. If you trade under any name other than your own legal name or your company name, it must be registered with ASIC, per Upcover.
Be careful with websites that offer to register an ABN for a fee. Wise warns that suspicious sites do this, and since the official application is free, paying a third party is optional at best.
ABN and GST: Why the Two Fields Are Different
An ABN is not the same as GST registration. The ATO says you must register for GST when your GST turnover reaches $75,000 ($150,000 for non-profits), and that you need to do so within 21 days of passing the threshold. Below that level, registration is optional. You need an ABN before you can register.
That is why the GST field on ABN Lookup carries weight. A business that is not registered should not charge GST, and a tax invoice from one deserves a second look. For the buyer, the check is simple: compare the GST start date on the record with the way the invoice treats GST.
ABN Lookup WA: Is There a Western Australia Search?
The sources I could read describe one national register. They do not describe a separate Western Australia version. Every record shows the state or territory of the main business location, so a Perth business is identified by the WA shown in its result. The advanced tool can also return ABNs for a chosen postcode.
Business names also work nationally. Upcover notes that ASIC, not the ABR, manages business names, and a registered name links back to the ABN. A search for a business in WA therefore follows the same steps as anywhere else in ABN Australia: search by ABN, ACN or name, then confirm the state in the result.
The 47% No-ABN Rule
The money side of this is what turns a quick check into a real saving. The ATO says a payer must withhold 47% of a payment for a supply if the supplier does not quote an ABN, unless an exception applies. The same applies if the payer has reasonable grounds to believe the quoted ABN is invalid, for example because it belongs to another entity. A supplier has to quote the ABN by the time of payment.
Sprintlaw gives a clear example: on a $1,000 invoice with no ABN, the payer withholds $470 and pays $530. Sleek says the rule generally applies to payments over $75 excluding GST. Some suppliers do not need an ABN, for example because they are not carrying on an enterprise, and they can use the ATO’s statement-by-supplier form. Employees, company directors under certain payments and labour-hire workers cannot use it.
Fake Invoices: Why a Real ABN Isn’t Proof
This is the point many guides miss. A valid ABN does not mean the invoice is genuine. Scamwatch warns that a fake invoice can carry the real business’s logo and ABN, and can arrive from a genuine email address that scammers have hacked or from one that looks almost identical.
The scam usually changes only the bank details. Scamwatch’s advice is to check payment details directly with the business before paying an emailed invoice, and to compare the BSB and account number with a previous genuine invoice. Lawpath says payment-redirection scams, including invoice fraud, were among the top scam categories in 2024, with losses of about $152.6 million.
Use ABN Lookup to confirm the entity exists. Then use a phone call to a number you already trust to confirm the bank details. The two checks cover different risks, and neither replaces the other. An eSafety guide on fake invoices also points readers to the free ABN check on business.gov.au when they are unsure a business is real. Report scams at scamwatch.gov.au.
Can’t Find an ABN? Common Reasons
- You searched a trading name. Try the legal name of the person or company.
- It is cancelled. Remove the active-only filter and the record should appear with its cancellation date.
- It is brand new. Lawpath says a newly activated ABN should show the same day. If it still does not, use the ABR’s contact form.
- A typo. Re-enter all 11 digits without letters or extra spaces.
- The business has no ABN. Some small operators do not have one. In that case a payer may have to withhold 47%.
- You were looking for contact details. They are not on the register.
Updating, Cancelling and Reactivating an ABN
An ABN is not a set-and-forget number. The ABR expects updates within 28 days, and an out-of-date record can mislead customers and cause problems with government agencies. If you stop trading, you should cancel the ABN. LegalVision says that should happen within 28 days of stopping operations, and the ATO says a cancelled ABN stops lodgment obligations from continuing.
The ATO also says that when you cancel an ABN, most linked tax registrations such as GST are cancelled automatically, and that you should check your postal address on the ABR first, because the cancellation notice is sent there. Some advisers say PAYG withholding and GST need to be cancelled separately, so confirm what applies to you with the ATO or a registered agent.
Reactivation is possible in many cases. LegalVision says a cancelled ABN can be reactivated if the structure has not changed and you are still entitled to one, and that the ATO sometimes carries out a manual review. If the structure has changed, such as a sole trader becoming a company, a new ABN is usually needed. The ABR may also send notices by email, post or text before a cancellation, per Registry, so keep your contact details current.
ABN Lookup for Developers and Bulk Checks
The ABR offers web services that let software validate ABNs and pull record data. A listing on Research Data Australia says access is free, the data updates hourly from the register, and you register to receive a GUID to use the service. The services support searches by ABN, by ACN and by name, and some can return registered business names or filter by active and cancelled status.
Developers should handle one limit in the design. Because the register holds no contact details, a lookup can validate a supplier but cannot complete a contact record on its own.
Common Questions About ABN Lookup
Is ABN Lookup free?
Yes. Searching is free, and the ABR’s web services are free to register for.
Can I find an ABN from a business name?
Yes, but the name must match what is on the register. Try the legal name if the brand name returns nothing.
Does an active ABN mean a business is legitimate?
No. It means the registration is current. It says nothing about solvency, quality or honesty.
Does the record show an address or phone number?
No. Only the state or territory and postcode appear.
Is the information current?
The web service data updates hourly from the ABR, but the underlying details depend on owners reporting their own changes.
What to Do Before You Pay or Sign
- Search the ABN on the invoice or contract, not the brand name.
- Confirm the status is active and read the date it took effect.
- Match the entity name with the name on the contract or invoice.
- Check the GST field and its start date against the invoice.
- For a company, check the ACN on the ASIC register too.
- Phone a known number to confirm bank details before paying.
- Save a copy of the result with the date, since records change.
The Bigger Picture
ABN Lookup works because it does one narrow job well: it tells you who is registered, and since when. It was never designed to vouch for anyone’s character, and treating it that way is where problems start. The most expensive mistakes in this area come from over-trusting a valid number, from a fake invoice carrying a real ABN to a payer withholding too little or too much under the 47% rule. Used alongside the invoice, the contract, the company register and a phone call, the tool takes about a minute and closes the most common gaps. More Australian explainers are on the News Protocol Australia page.
Sources
- ABN Lookup FAQs, Australian Business Register
- ABN Lookup Glossary, Australian Business Register
- ABN Lookup tools, Australian Business Register
- Update your ABN details, ABR
- Statement by a supplier not quoting an ABN, ATO
- Registering for GST, ATO
- Cancelling business registrations, ATO
- Scam alert: fake business invoice scams, Scamwatch
- ABN Lookup web services, Research Data Australia
- How to Find Your ABN, Lawpath
- Fake invoice scams, Lawpath
- Reactivating a cancelled ABN, LegalVision
- Why was my ABN cancelled?, Registry
- Australian company register guide, CompanyData
- ABN Lookup 2026, Scrap.io
- How to get an ABN, Upcover
- Australian Company Number, Wikipedia
