Can You Have 2 ABNs in Australia?

As a small business owner, it’s normal to reach a point where your operations evolve. Maybe you’re branching into a new product line, setting up a second venture with a partner, or preparing to spin off a division into its own company. When this happens, one question comes up a lot: can you have two ABN numbers?

In Australia, the Australian Business Number (ABN) is central to running a business legitimately. Getting this right from the start helps with tax, invoicing, and credibility with customers and suppliers. In this guide, we’ll explain when you can have more than one ABN, when you can’t, and how to structure your business so everything is compliant and set up for growth.

We’ll also cover the scenarios where operating multiple businesses under one ABN makes sense, when a separate entity and ABN is the better choice, and the legal documents you should consider as you expand.

Quick Refresher: What Is An ABN And Who Needs One?

An Australian Business Number (ABN) is a unique 11-digit identifier for a business. It’s used on invoices, for GST, when dealing with other businesses, and in many everyday business interactions.

If you’re running a business in Australia (as a sole trader, company, trust or partnership), you generally need an ABN. If you’re weighing up the pros and cons of getting one as you start out, it’s worth reading about the advantages and disadvantages of having an ABN.

As your venture grows, it also helps to understand what actually counts as “doing business” under Australian law. This can be nuanced, so if you’re unsure whether your activity crosses the threshold, see our plain-English breakdown of what defines a business activity.

So, Can You Have Two ABN Numbers?

Short answer: yes, you can have more than one ABN - but only if you have more than one business entity.

Each ABN is tied to a particular legal entity:

• Sole trader (an individual)
• Partnership (two or more people or entities carrying on business together)
• Company (a separate legal entity registered with ASIC)
• Trust (a trustee operating a business for the benefit of beneficiaries)

One entity gets one ABN. You can’t have two ABNs for the same entity. However, if you set up a new entity (for example, a company alongside your sole trader activities), that new entity can have its own ABN. That’s how a business owner ends up with “two ABN numbers”-one per entity they control.

By contrast, if you’re just launching a second product line or a new trading name inside the same entity, you don’t need a new ABN. You can generally run multiple ventures under one ABN and register separate business names for branding.

Two Common Paths: One ABN With Multiple Businesses vs Separate ABNs

Option 1: One Entity, One ABN, Multiple Business Names

Many owners operate several offerings under a single entity and ABN. For example, you might run a design studio and a print-on-demand service as one sole trader or company. In that case, it’s typical to register additional business names for branding while continuing to invoice under the same ABN.

If this is your situation, you may find it helpful to consider whether you can use one ABN for multiple business lines. We’ve addressed the practicalities here: can you use one ABN for multiple businesses.

Branding tip: your legal entity name isn’t the same as your trading name. If you’re clarifying your options, this breakdown of business name vs company name explains how they differ and when each is used.

Option 2: Separate Entities, Separate ABNs

There are plenty of reasons to separate out new ventures into their own entities (and ABNs):

• Risk management and asset protection (ring-fencing liabilities in separate companies or a trust)
• Bringing in co-founders or investors on specific ventures
• Preparing for a sale of one business while keeping others
• Operating in a different industry with distinct regulatory or operational risk

For example, you may keep your consulting business as a sole trader but set up a company for a new eCommerce brand. The sole trader and the company are different legal entities, so each gets its own ABN.

If you’re exploring a trust structure, keep in mind that trusts have their own setup and tax numbers. This overview of trust requirements in Australia (ACN, ABN, TFN) outlines what’s involved and how a trustee operates the business for the trust.

When Should You Split Out A New Entity (And ABN)?

There’s no one-size-fits-all rule. It comes down to risk, growth plans, funding needs and administration.

Good reasons to create a new entity (and ABN)

• You want limited liability for a higher-risk venture and prefer a company structure.
• You’re bringing in a co-founder or investor who should only own a stake in the new venture, not your existing business.
• You plan to sell or franchise the new business separately in future.
• You need a different ownership or profit-sharing model (e.g. a unit trust for investors).

Good reasons to keep it under one ABN

• You’re testing a small side offering and want to keep administration simple.
• The risk profile is low and similar to your current activities.
• You don’t need outside investment or a different ownership structure.

If you decide a new company is the right move, you’ll need at least one Australian resident director. You can read more about the Australian resident director requirements before you incorporate.

Practical FAQs On ABNs For Multi‑Business Owners

Can I hold two ABNs as the same sole trader?

No. A single legal entity can only have one ABN. If you’re a sole trader, that ABN stays with you for all your business activities as that sole trader. If you want a separate ABN, you need a separate entity (for example, register a company or create a trust).

Can my company have several ABNs?

No. One company, one ABN. If you operate multiple brands under one company, you can register multiple business names, but the ABN stays the same.

What if I start a partnership on the side?

A partnership is a different entity from you as a sole trader or your company. The partnership can apply for its own ABN. That’s a common way founders run a one-off project together without changing their existing businesses.

Do ABNs expire? What if I paused a venture and want to restart?

ABNs don’t automatically expire, but they can be cancelled if you stop trading. If you’re reactivating, it’s worth checking the status first using this quick guide on how to check if an ABN is active. If you’ve genuinely ceased activity for one entity and won’t use it again, make sure your records reflect that.

Can I run a business without an ABN while I “test the waters”?

If you’re invoicing or operating in a way that amounts to running a business, you’ll usually need an ABN. There are some nuances, so this overview on whether you can run a business without an ABN may help you assess your situation.

How To Set Up A New Entity (And ABN) The Right Way

If you’ve decided your new venture should sit in its own entity, here’s a high-level roadmap.

1) Choose a structure

Think about risk, funding, and control. Common options include:

• Sole trader: simple and low cost, but no separation between you and the business liabilities.
• Company: a separate legal entity that offers limited liability and is often better for growth and investment.
• Trust: can be useful for investment or asset protection, but requires a trustee and more administration.
• Partnership: simple for two or more people to operate together, but partners can be jointly liable.

2) Register the entity and get its ABN

For a company, you’ll register with ASIC, adopt a Company Constitution or rely on replaceable rules, and apply for the company’s ABN once the ACN is issued.

If you’re setting up a trust, you’ll arrange the trust deed, appoint a trustee (often a company), and apply for the trust’s ABN and TFN. Partnerships also apply for their own ABN.

3) Register business names and set up branding

Your entity’s legal name can differ from the trading name you use in the market. If you want a unique brand per venture, register the relevant business name and consider trade mark protection for your logo or brand elements.

4) Put the right governance in place

If you have co-founders or investors in the new company, document roles, decision-making and ownership using a Shareholders Agreement. This helps prevent disputes and clarifies how key decisions are made.

5) Get your customer and supplier contracts ready

Before trading, make sure you have tailored contracts and policies. If you’re selling goods or services online, a Website Terms and Conditions and Privacy Policy are essential. For B2B or service work, robust Terms of Trade set expectations and reduce risk.

6) Consider employment and contractors

As you grow, ensure staff have appropriate agreements and you’re meeting Fair Work obligations. A clear Employment Contract (or contractor agreement) plus policies around conduct and privacy will set standards from day one.

What Legal Documents Should You Have In Place?

Whether you keep everything under one ABN or set up a new entity, strong paperwork protects your business and helps you scale with fewer headaches. Documents to consider include:

• Shareholders Agreement: Sets out ownership, decision-making, exits and dispute processes between founders and investors.
• Company Constitution: The rulebook for how your company operates internally (board meetings, share issues, director powers).
• Terms of Trade or Customer Contract: Covers scope, pricing, payment, risk allocation, IP ownership and liability with clients.
• Website Terms and Conditions: Rules for using your site or app, including acceptable use and limitations of liability.
• Privacy Policy: Explains how you collect, use and store personal information to align with the Privacy Act.
• Employment Contracts and Policies: Outline rights, responsibilities, confidentiality and post-employment restraints where appropriate.
• Non-Disclosure Agreement (NDA): Protects confidential information when exploring partnerships, suppliers or investors.
• Supplier/Manufacturer Agreements: Ensure supply, quality standards, delivery timelines and remedies are clear and enforceable.

Not every business will need all of these from day one, but most growing ventures need several. Getting them tailored to your operations and risk profile makes a real difference if a dispute arises.

Compliance Tips When You Run Multiple Ventures

When you operate more than one business - whether under one ABN or across several entities - a little extra discipline goes a long way.

• Keep records clean: Separate bank accounts and bookkeeping per entity. If you’re running multiple brands under one ABN, track income/expenses per brand for clarity.
• Use consistent branding and disclosures: Make sure invoices, quotes and websites clearly display the correct entity name and ABN.
• Be clear on tax and registrations: Register for GST if required and lodge activity statements for each entity on time.
• Check ABN status periodically: If you pause or close a venture, ensure the ABN status and records match reality so you don’t create confusion down the track.
• Know when to restructure: If a side brand starts to outgrow the core business, consider moving it into its own company for risk management and clean ownership - and obtain a new ABN for that entity.

Key Takeaways

• One legal entity can only have one ABN. To hold two ABN numbers, you must operate through two separate entities (for example, your sole trader activity and a new company).
• You can run multiple business lines under one ABN by registering additional business names, as long as they sit within the same entity.
• Create a new entity (and ABN) when you need limited liability, different ownership, investment, or to ring-fence risk for a new venture.
• Set up the basics for any new entity: structure selection, entity registration, business names, and core contracts like Terms of Trade, Privacy Policy and Employment Contracts.
• If you’re unsure whether your activity is a business, or whether a new ABN is needed, check what counts as a business activity and confirm your ABN status if you’ve paused and plan to restart.
• Getting the structure and documents right early makes compliance easier and protects your brand as you grow.

If you’d like a consultation on structuring multiple ventures and ABNs for your small business, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.