Setting up or expanding a business in Australia comes with a few acronyms. Two you’ll see a lot are ABN and ARBN. They look similar, but they serve very different purposes - and choosing the wrong pathway can cause delays or compliance headaches.
In this guide, we’ll clearly explain what an ABN and ARBN are, who needs each one, how to register, and the key compliance points to keep in mind. Our goal is to help you set things up properly so you can focus on running and growing your business with confidence.
Note: The tax information in this article is general in nature. Always seek advice from a qualified tax professional about your specific circumstances.
What Is an ABN?
An Australian Business Number (ABN) is an 11‑digit identifier issued by the Australian Business Register (managed by the ATO) to entities carrying on an enterprise in Australia. In practice, most businesses need an ABN to operate smoothly - to invoice, register for GST if required, deal with government agencies, and interact with other businesses.
Having an ABN helps you:
- Identify your business to government and other businesses (e.g. on invoices and forms)
- Register for GST if your turnover meets the threshold
- Avoid having tax withheld from payments where no ABN is provided
- Register a business name and apply for certain licences or .com.au domains
Before you apply, it’s worth weighing up the advantages and disadvantages of having an ABN, and whether it suits the way you plan to operate.
What Is an ARBN (And How Is It Different From an ACN)?
An Australian Registered Body Number (ARBN) is a 9‑digit identifier issued by ASIC to certain “registered bodies” that are not incorporated Australian companies. In plain English, ARBNs are typically issued to:
- Foreign companies that register with ASIC to carry on business in Australia; and
- Australian “registrable bodies” that are not companies under the Corporations Act (for example, an incorporated association that registers to operate outside its home state or territory).
Important distinction: Australian companies (e.g. proprietary limited or “Pty Ltd” entities) receive an Australian Company Number (ACN), not an ARBN. A company can operate nationally with its ACN - it does not need an ARBN to do business interstate.
If you intend to incorporate, consider whether a company structure is right for you and what’s involved in a company set up. If you don’t want to incorporate (for example, you’re an incorporated association looking to expand across borders), an ARBN may be the right path.
Quick summary:
- ABN: Tax and government identifier used by most businesses and entities carrying on an enterprise.
- ACN: Issued to Australian companies when registered with ASIC.
- ARBN: Issued by ASIC to foreign companies and certain non‑company registered bodies.
Who Needs an ABN, an ARBN - Or Both?
Here’s how to work out what applies to you.
When You’ll Need an ABN
You’ll generally need an ABN if you’re carrying on an enterprise in Australia (for example, as a sole trader, partnership, trust, company or not‑for‑profit). This allows you to invoice, manage PAYG/GST obligations and interact with government and other businesses. If you’re unsure, think about whether you can practically operate without an ABN - most businesses can’t.
When You’ll Need an ARBN
You’ll typically apply for an ARBN if:
- You’re a foreign company and you intend to carry on business in Australia on an ongoing basis (not just for a short project); or
- You’re an Australian “registrable body” (such as an incorporated association) and you plan to operate outside your home state or territory without converting to an Australian company.
If you’re an association planning to expand beyond a single state, an ARBN application for an incorporated association is often the pathway.
When You’ll Need Both
Some entities need both identifiers:
- Foreign companies carrying on business in Australia generally need an ARBN (for ASIC registration) as well as an ABN (for tax and general business dealings).
- Registrable Australian bodies with an ARBN often also need an ABN for invoicing, GST and dealings with the ATO.
Australian companies receive an ACN on registration with ASIC and will also need an ABN. They do not require an ARBN.
How Do You Register? Step‑By‑Step
ABN Registration
- Choose your structure: Decide whether you’ll operate as a sole trader, partnership, trust or company. If you’re leaning toward a company, consider your goals, liability and governance obligations as part of your company set up.
- Apply online: Lodge your ABN application with the Australian Business Register.
- Outcome: In many cases, ABNs are issued instantly. If the ABR needs more information, it may take longer.
- Use your ABN: Include your ABN on invoices and official documents. Keep your details up to date if anything changes.
ARBN Registration
- Confirm eligibility: Determine whether you’re a foreign company or an Australian registrable body (e.g. an incorporated association) that needs to register under the Corporations Act.
- Prepare documents: You’ll need constituting documents, proof of existing registration (for foreign companies, in their home jurisdiction), and certified translations if applicable. Foreign companies typically appoint a local agent in Australia.
- Apply with ASIC: Lodge the application and supporting documents via ASIC’s channels. Processing times vary depending on the complexity of your structure and documents.
- Display your ARBN: Once issued, include your ARBN on required public documents and ASIC filings.
If you’re weighing up cross‑border expansion, some businesses also choose to incorporate a local subsidiary instead of registering a foreign company - this is a strategic choice that depends on control, liability, tax and operational preferences.
Compliance Essentials To Keep You Out Of Trouble
Once you have the right identifiers in place, compliance becomes an ongoing habit rather than a one‑off task.
For ABN Holders
- Tax and GST: Report income, keep accurate records and register for GST if required. Consider cash flow impacts and set up systems from day one.
- Names and branding: If you’re not trading under your own name, register a business name. Understand the difference between a business name vs company name so you’re clear on what each does (and doesn’t) protect.
- Consumer law: If you sell goods or services, ensure your marketing, refunds and warranties comply with the Australian Consumer Law.
- Privacy and data: If you collect personal information (for example, through a website, app or mailing list), you may have obligations under the Privacy Act 1988 (Cth). Many businesses adopt a clear, accessible Privacy Policy as good practice and to meet platform or customer expectations, even where not strictly required by law.
For ARBN Holders (Foreign Companies and Other Registered Bodies)
- ASIC obligations: Keep company details current, lodge required financial statements and notices, and (for foreign companies) maintain a local agent to act on your behalf in Australia.
- Public disclosures: Ensure your ARBN is displayed on required public documents (e.g. letterhead, website notices and certain contracts).
- Tax in Australia: If you derive Australian‑sourced income, you’ll generally need an ABN and to meet Australian tax obligations in addition to your home‑jurisdiction requirements.
If You Operate Through an Australian Company
- Directors and governance: Companies must meet director eligibility and residency rules. If you’re new to Australian directorships, review the Australian resident director requirements.
- Company details: Keep ASIC records current, pay annual review fees and ensure your public documents display the correct details (ABN/ACN as required).
Key Legal Documents To Put In Place
Getting your structure and identifiers right is a strong start. The next layer of protection comes from your contracts and policies. The exact suite you need will depend on your model, but most growing businesses benefit from the following.
- Company Constitution: The rulebook for how your company is managed, including decision‑making and director powers.
- Shareholders Agreement: Sets expectations between co‑founders or investors on ownership, roles, exits and dispute processes.
- Privacy Policy: Explains how you handle personal information and supports compliance with privacy and platform requirements.
- Website Terms and Conditions: Sets the rules for using your site or platform and limits your risk.
- Customer or Service Terms: Clear terms for how you sell your products or services, payment, delivery and liability.
- Employment or Contractor Agreements: Defines responsibilities, IP, confidentiality and termination rights for your team.
- NDAs and Supplier Agreements: Protects confidential information and sets expectations with key partners.
Not every business needs every document on day one, but having the essentials tailored to your operations will significantly reduce risk and confusion as you scale.
Key Takeaways
- ABN and ARBN serve different purposes: the ABN identifies you for tax and government dealings, while the ARBN identifies foreign companies and certain non‑company registered bodies with ASIC.
- Australian companies receive an ACN and can operate nationally without an ARBN; many will also need an ABN for everyday business activities.
- Foreign companies and some registrable Australian bodies often need both an ARBN (ASIC) and an ABN (ATO) to operate lawfully in Australia.
- Registration is only the first step - keep your details up to date, meet ASIC and tax lodgement obligations and display the correct number on required documents.
- Protect your position with the right documents, such as a Company Constitution, a Shareholders Agreement and clear online terms and policies.
- For tax questions and structure choices, get tailored advice early so your setup supports your growth plans and compliance from day one.
If you would like a consultation on the difference between an ABN and ARBN - or help setting up the right structure and registrations for your Australian business - you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no‑obligations chat.
