What is an ABN and how do you get one? - Aspire

Summary

An ABN is a free, 11-digit number issued by the Australian government that identifies your business in all commercial and tax dealings, and without one, other businesses are legally required to withhold 47% of any payments made to you.
Not everyone is automatically entitled to an ABN. You generally qualify if you are conducting a genuine business activity in Australia, whether as a sole trader, partnership, company, or contractor, but hobbyists and those doing occasional personal projects may not meet the criteria.
Applying online through the Business Registration Service at register.business.gov.au is the fastest route, and including your Tax File Number typically results in instant approval, with more complex applications reviewed within 20 business days at no cost.
Your ABN is often just the starting point. Depending on your turnover, structure, and activities, you may also need to register for GST, PAYG withholding, and a business name, all of which can be bundled into the same application to save time.
Once your ABN is active, you must quote it on all invoices and business communications, update your details on the Australian Business Register within 28 days of any changes, and cancel it properly when you close your business to meet all outstanding tax obligations.

Why do you need an ABN in Australia?

Your ABN acts as your business's official identifier across government and commercial dealings. In practice, it's used for quoting on invoices, registering for GST, and accessing tax deductions.

Without one, other businesses must legally withhold tax from payments to you at 47%. That's a significant chunk of your income gone before it reaches you. Your ABN signals that you're a legitimate, registered business to clients and suppliers.

Who needs an ABN?

Not everyone is automatically entitled to an ABN. Common business types that typically qualify include:

Sole traders expecting GST turnover over AUD $75,000
Partnerships conducting any business activity in Australia
Companies registered with ASIC
Contractors or freelancers who regularly invoice clients for work

If you're earning from a hobby or doing occasional personal projects, you may not be entitled to an ABN. The ATO has an "Are you in business?" tool to help you check your situation. When in doubt, confirm your entitlement before you apply.

How much does an ABN cost?

If you've been searching "What is an ABN?" and wondering whether it costs anything to get one, the good news is: registration is free. You apply through the Australian Government's Business Registration Service or directly through the Australian Business Register (ABR). There are no application fees and no ongoing renewal charges.

Some third-party services charge to handle your application, but going directly costs nothing. You can save your money by applying through the official government portals.

What to prepare before you apply

Getting your documents ready beforehand reduces delays and speeds up the process. Here's what you'll typically need before you begin:

Your Tax File Number (TFN) and TFNs for any associates or partners
Your Australian Company Number (ACN), if registering a company
Your legal business name and main business activity description
Contact details for any authorised representatives
Your intended business start date within 6 months of applying

If you're a sole trader, including your TFN often results in instant ABN approval. For companies, get your ACN from ASIC first before applying for an ABN.

How to apply for an ABN

There are 2 main ways to apply. Both paths are straightforward, and you can bundle your GST and PAYG withholding registrations at the same time.

Apply online through the Business Registration Service

The Business Registration Service at register.business.gov.au is the easiest starting point for most people. You'll answer a series of questions to confirm your entitlement. With your TFN included, you'll often receive your ABN instantly.

Applications needing manual review are processed within 20 business days. You can track your progress on ABN Lookup at any time.

Apply through a registered tax agent or BAS agent

If your business structure is complex, a registered tax agent or BAS agent can help apply on your behalf. This path suits companies, trusts, or businesses with multiple partners. Agent fees apply, but professional help reduces errors and saves time.

What happens after you apply?

If approved instantly, your 11-digit ABN will appear on screen. You should save or print the confirmation document straight away. If the ABR needs to verify more details, you'll receive a reference number and a follow-up letter within 14 days. Once confirmed, your business details are listed on the Australian Business Register. You can request that certain details stay private if needed.

Once your ABN is active, other businesses can look up your details on the public ABR register. This builds trust with clients and suppliers. It also confirms that you're operating legitimately, which matters when you're invoicing, signing contracts, or applying for business finance.

If your application is refused, you'll get a refusal number and a letter explaining why, along with your review rights. It may be helpful to consult a tax agent or BAS agent for help if your application is denied.

What other registrations should you consider?

Your ABN is often just the beginning. Depending on your business type and size, several other registrations may be required.

GST registration

Goods and Services Tax (GST) is a 10% tax on most goods and services sold in Australia. You must register if your annual GST turnover reaches AUD $75,000, or AUD $150,000 for not-for-profits. Be sure to register within 21 days of hitting that threshold.

Some businesses, like ride-sourcing providers, must register regardless of turnover. You can bundle GST registration with your ABN application to save time.

PAYG withholding

Pay as you go (PAYG) withholding applies if you employ staff or engage contractors under voluntary agreements. You withhold a portion of their payment and forward it to the ATO. You should register for PAYG before you withhold tax from anyone. Like GST, you can complete this at the same time as your ABN application.

Business name registration

If you trade under a name other than your own legal name, register it with ASIC. For example, "John Smith" needs no registration, but "John Smith Landscaping" does. You need your ABN in place before you can register a business name with ASIC.

What to do once you have your ABN

Once your ABN is confirmed, there are a few practical steps to take straight away. These are the key actions to complete as soon as possible:

Quote your ABN on all invoices and business communications immediately
Update your ABR details within 28 days if your address or structure changes
Register for GST, PAYG, or a business name if you haven't already
Cancel your ABN and meet all tax obligations when you close your business

Knowing how to find your ABN is also useful if you lose your documentation. Search ABN Lookup at abr.business.gov.au using your business name or registered details. It's free and publicly accessible. Keep your information current, as multiple government agencies rely on it.

FAQs

Here are answers to some common questions about ABNs.

What is an ABN used for?

An ABN is used to identify your business to the government and clients. It's essential for invoicing, registering for GST, and claiming tax deductions.