Running multiple businesses under one company in Australia is more common than most people realise. A tradie who starts a labour hire division, a consultant who launches a software product, a retailer who opens a second brand — all of them face the same question: does each venture need its own legal structure, or can they sit comfortably together? The answer depends on your goals, your risk tolerance, and how much complexity you're willing to manage.
What "one company" actually means in this context
In Australia, a company is a legal entity registered with the Australian Securities and Investments Commission (ASIC) under the Corporations Act 2001. That entity has a single Australian Company Number (ACN) and a single set of directors and shareholders. It can trade under multiple business names, operate in multiple industries, and hold multiple ABNs for different GST registrations — all without creating separate companies.
A business name registered with ASIC is not a separate legal entity. It's a trading name attached to the underlying company. So when customers see "Bright Cleaning Co" and "Bright Property Services," they may be dealing with the same Pty Ltd behind both brands.
Option 1: Multiple trading names under one ABN
The simplest approach is registering multiple business names under one company and one ABN. All revenue flows into the same entity. All expenses are deducted from the same tax return. Reporting stays consolidated.
This works well when the businesses are closely related and carry similar risk profiles. A web design firm adding a social media management service, for example, doesn't need a separate company. The liability exposure is comparable, the client type is the same, and the administrative overhead of running two separate entities rarely pays off.
The downside is that liabilities are shared. If one trading arm gets sued or accumulates debt, the same company assets are on the line for all of it.
Option 2: One holding company with multiple subsidiaries
A more structured approach is a holding company (sometimes called a parent company) that owns shares in two or more subsidiary companies. Each subsidiary operates its own business and carries its own liabilities. The holding company sits above them all, owning the assets and collecting dividends.
This structure is common among Australian small business owners who run genuinely distinct businesses with different risk profiles. A property developer who also runs a café, for instance, would not want the liability of hospitality spills tainting a property portfolio held in the same entity.
Key advantages of the holding company structure include:
- Asset protection: profits shifted up to the holding company are sheltered if a subsidiary faces legal action.
- Clean separation: each subsidiary has its own financials, making it easier to sell, bring in investors, or shut down one arm without affecting the others.
- Flexibility: subsidiaries can have different shareholding arrangements, allowing business partners in one venture without giving them a stake in everything else.
The trade-off is cost and complexity. You're maintaining multiple ASIC registrations, multiple tax returns, and potentially multiple sets of directors. An accountant experienced with group structures is not optional here — it's a practical necessity.
Can a business owner have multiple ABNs under one company?
Yes, but only in specific situations. If your company registers for GST in different capacities (for example, as a non-profit fund alongside a commercial trading arm), the ATO can issue separate ABNs. In practice, most companies operating multiple businesses use a single ABN and distinguish the businesses through business name registrations only. If you're unsure whether your situation warrants separate ABNs, it's worth reading up on whether a business owner can have multiple ABN numbers before registering.
Tax implications of running multiple businesses together
Tax is where the structure decision gets real. Under a single company, all business income is taxed at the corporate rate (25% for base rate entities with an aggregated turnover under $50 million, or 30% for larger companies). Losses in one business arm offset profits in another within the same entity. That can be a genuine advantage in the early years of a new venture.
Under a holding and subsidiary structure, inter-company transactions must be conducted at arm's length. Transfer pricing rules apply even for related Australian entities, and the ATO watches related-party dealings closely. Dividends flowing up to the holding company may carry franking credits, reducing the overall tax burden for shareholders, but the mechanics depend on each company's tax position.
GST is also worth checking. If both businesses are registered under the same ABN, they file a single BAS. If they have separate ABNs, each files separately. Most accountants prefer the single ABN approach where eligible — it reduces paperwork without meaningful cost.
Director duties apply across all businesses
Running multiple businesses doesn't dilute your obligations as a director. The Corporations Act 2001 requires directors to act in good faith, avoid conflicts of interest, and prevent insolvent trading — regardless of how many companies or trading arms they oversee. If you sit on the board of a holding company and its subsidiaries, you carry duties across all of them.
This matters most when one business is struggling. A director who allows a subsidiary to continue trading while insolvent can face personal liability, even if the holding company is financially healthy. Understanding the difference in responsibilities between a company director and a company secretary is a good starting point for anyone taking on a multi-entity structure for the first time.
Insurance across multiple businesses
One company trading under multiple names doesn't automatically mean one insurance policy covers everything. Insurers underwrite risk based on business activities. A company that does IT consulting and roofing under the same ABN will face questions about which activity the policy actually covers.
If your businesses are genuinely distinct in what they do, separate public liability and professional indemnity policies for each trading arm is the standard advice. When multiple subsidiary companies are involved, each company needs its own policies unless a group insurance arrangement has been explicitly structured. Get this wrong and a claim in one arm of the business can be declined because the insurer wasn't told the full picture of what the company does.
When to keep businesses separate vs. together
There's no universal answer. Keeping everything under one company makes sense when the businesses share clients, staff, and suppliers — and when the legal risks are similar. Separating them into distinct entities makes sense when:
- One business carries significantly higher liability than the other (for example, a construction business alongside a consulting practice).
- You plan to bring in external investors or partners to one business only.
- You might sell one business in the future and want clean financials to show a buyer.
- One business could realistically fail, and you don't want that failure to drag everything else down.
A conversation with both an accountant and a commercial lawyer before you set up the structure costs far less than restructuring later. Most business owners who regret their original structure do so because they chose the simplest option upfront without modelling what the business would look like in three to five years.
Registering additional business names
If you decide to operate multiple businesses under one company, each business name must be registered with ASIC. Business name registration currently costs $44 for one year or $102 for three years. The name can't be identical to an existing registered name or company name, and you'll need to display the registered name on any public-facing documents and your website. The company's ACN or ABN must also appear wherever the business name is used.
One practical note: if the different businesses operate in industries with separate licensing requirements (trades, financial services, healthcare), each arm will need its own licences regardless of the shared corporate structure. A company name on an ASIC register doesn't substitute for a contractor licence or an Australian Financial Services Licence.
Getting the structure right from the start
Running multiple businesses under one company in Australia is workable, flexible, and often tax-efficient — but only if the structure fits the actual risk profile of each business. The businesses that get into trouble are usually those that lumped everything together for convenience and discovered too late that a claim or a creditor in one arm could reach everything else. Start with the structure that fits where you want to be in five years, not just where you are today.