Trading As, what It Means for Your Business Name and Legal Entity

"Trading as", often shortened to "t/a", is the phrase that connects the name your customers see with the legal entity that actually owns and runs the business. "Jane Smith t/a Coastal Cleaning" tells you the individual Jane Smith stands behind the business. "XYZ Holdings Pty Ltd t/a Sunshine Cafe" tells you the company does.

It is a simple idea, but the details trip up plenty of new and growing businesses: whether a trading as name creates a new entity, when you are required to register the name, and how to use it correctly on contracts, invoices and signage. This guide explains what trading as means in Australia, the rules that apply to business names, and the mistakes to avoid.

What "Trading As" Actually Means

"Trading as" is shorthand for saying that a legal entity is operating under a different, public-facing name. The entity behind the name can be an individual, a company, a partnership or a trustee. The trading name is only a label. It does not create a new company, and it does not create a new person in law.

That distinction matters because everything important flows to the legal entity, not the name. The entity signs the contracts, pays the tax, holds the assets and is liable for the debts. If Coastal Cleaning is sued, the claim runs against Jane Smith. If Sunshine Cafe goes broke, the creditors look to XYZ Holdings Pty Ltd.

The business name itself is recorded against the entity on the Business Names Register, which is administered by ASIC. When you see "XYZ Holdings Pty Ltd t/a Sunshine Cafe", you are looking at the register's logic made visible: the company is the entity, Sunshine Cafe is the registered business name attached to it, and "trading as" is the link between the two.

Company Name, Business Name and Trading As: Three Different Things

The terminology confuses people partly because the words overlap in everyday use. In Australian law they refer to three separate things:

Company name: the name of the company as registered on the public register at ASIC, such as "XYZ Holdings Pty Ltd". It identifies the legal entity itself.
Business name: the name you use in trade when it is not your own personal name or your company's exact registered name, such as "Sunshine Cafe". It identifies the banner you trade under, not the entity.
Trading as: the connective phrase that shows which legal entity stands behind a business name, as in "XYZ Holdings Pty Ltd trading as Sunshine Cafe".

In short: the company name or personal name identifies who owns and runs the business, and the business name is how the market knows them. The two are joined whenever you say you are "trading as" that business name. A sole trader does not have a company name, so the legal entity is simply the individual's own name.

When You Must Register a Business Name

In most cases, if you want to trade as a name, you must register it. Under s 18 of the Business Names Registration Act 2011 (Cth) (the Act), carrying on a business under a name that is not registered to you is an offence carrying a maximum penalty of 30 penalty units.

The Act sets out the situations where no registration is needed, and they are narrow:

an individual trading under their own name;
a company trading under its exact registered name; or
a partnership trading under a name made up of all the partners' names.

ASIC's guidance is even more specific for sole traders: you must use your first name and surname and nothing else. "Jane Smith" needs no business name; "Jane Smith Gardening" or "Jane Smith & Co" does. Similarly, if your company's registered name is "Sunshine Cafe Pty Ltd", you can trade as "Sunshine Cafe" without registering anything, but trading as "Sunshine Roastery" would require a business name registration. Trusts trade through their trustee, and the business name is registered to the trustee that operates the business.

To register, you need an ABN, the registration fee, and a name that is available. ASIC's online register uses a traffic light system when you check a proposed name: green means it is available, amber means it needs assessment, and red means it is unavailable. Registration is granted for a term of either one or three years under s 33 of the Act, and ASIC must remind you before the term expires. If you let the registration lapse and keep trading, you fall back into the s 18 offence, and the name may also become available for someone else to register.

What Registration Gives You, and What It Does Not

Registering a business name gives you the right to lawfully trade under that name, and it stops ASIC from registering the identical or nearly identical name to another business. That is the extent of the protection.

Under s 17 of the Business Names Registration Act 2011 (Cth), registration does not give you property in the name, and it does not affect anyone's rights in the name under other laws. ASIC makes the practical point bluntly: registration does not stop other people using similar words in their business name, and it does not protect you against legal action if you use someone else's trade mark.

If you want genuine brand protection, the separate step is a trade mark. Under s 20 of the Trade Marks Act 1995 (Cth), the registered owner of a trade mark gets the exclusive right to use the mark for the goods and services it is registered for, plus the right to sue for infringement. Business name registration and trade mark registration answer different questions: one asks "who is behind this business?", the other asks "who owns this brand?"

A Worked Example: From Sole Trader to Company

Maya is a baker who runs her business as a sole trader under the registered business name "Bayside Bakehouse". She has an ABN, the name is registered to her on the Business Names Register, and she signs her shop lease and supplier contracts in her own name, "Maya Chen t/a Bayside Bakehouse". If the business is sued, the claim runs against Maya personally, because she is the legal entity.

Two years in, Maya incorporates "Bayside Bakehouse Pty Ltd" to take on a co-owner and limit her personal exposure. The business name does not automatically follow the brand. Because the name must be registered to the entity that carries on the business, Maya needs to update the register so the business name is held by the new company rather than by her personally. From then on her invoices read "Bayside Bakehouse Pty Ltd (ACN 123 456 789) trading as Bayside Bakehouse (ABN 11 111 111 111)", contracts are signed by the company, and the business name registration still needs renewing every one to three years.

If Maya wants to stop another baker using "Bayside" branding, business name registration will not do that job. She would need to register the name and logo as a trade mark in the classes that cover her products before someone else does.

Using a Trading As Name Correctly Day to Day

Once the name is registered, the rules for using it are straightforward but easy to slip on:

Display it where customers can see it: Under s 20 of the Business Names Registration Act 2011 (Cth), you must display your business name prominently at every place where you carry on business that is open to the public, such as a storefront. On business documents like invoices and purchase orders, ASIC requires the registered business name and ABN to appear.
Companies have extra document rules: Under s 153 of the Corporations Act 2001 (Cth), a company must set out its name on all its public documents and negotiable instruments, and must set out its ACN alongside the name unless the last nine digits of the ABN match the ACN. On invoices, quotes and contracts, showing both the company name and the trading as business name is what makes it clear who the customer is dealing with.
Sign contracts in the legal entity's name: A business name is not a legal entity and cannot enter a contract. The contract should be made with the entity itself, executed in its name, with the trading as name noted for identification. This is where errors cause real pain: if only the business name appears on the signature page, it can be unclear who is actually bound, and for a sole trader the answer is still the individual.
Keep everything consistent and current: Use the same spelling and punctuation everywhere, and tell ASIC about changes to your details, which it expects within about 28 days. A lapsed registration interrupts your right to trade under the name, so put renewal dates in the calendar.

Common Misconceptions About Trading As

The same wrong ideas come up again and again, and each one has a practical cost:

"Trading as creates a new legal entity": It does not. The individual, company, partnership or trustee remains the entity that is liable, taxed and bound. You cannot shield yourself by trading under a name.
"Registering the business name means I own the name": Section 17 of the Act says the opposite: registration gives you no property in the name. Someone else can use similar words, and another business can even hold a trade mark over the same name.
"A business name is the same as a trade mark": They are different regimes with different registers and different rights. Business names identify who is behind a business; trade marks protect brands and are enforceable against copycats.
"I can trade under any name I like": Trading under an unregistered name is an offence under s 18 of the Act, and ASIC can also refuse names that are undesirable or too close to an existing registration.

When a Lawyer Can Help

For many businesses, registering a business name is a do-it-yourself job through ASIC Connect. The situations where professional help earns its keep are the ones where the consequences of getting it wrong are larger.

A lawyer can help you choose the right structure before you lock in a name, since the entity behind the trading as name determines your personal liability and tax position. If you are transferring a business name between entities, restructuring from sole trader to company, or buying a business whose name you want to keep, getting the registration and documents right matters. A trade mark search and registration strategy is another area where a lawyer adds value, because a business name registration will not stop a trade mark owner from coming after your branding.

Lawyers also handle the disputes: someone using a confusingly similar name, a trade mark conflict, or a contract that was signed in the wrong name and needs to be sorted out. In each case the work starts from the same place, identifying who the legal entity actually is.

Ask Who Your Customers Are Actually Dealing With

The most expensive mistake in this area is treating the trading as name as if it were the entity. A business name cannot sign a contract, cannot be sued, and cannot protect your brand. When the business fails or a dispute arrives, the law looks past the name to the person or company behind it, and that is who pays.

So the question worth asking about your own business is a simple one: if a customer opened your latest invoice, could they tell, without guessing, exactly which legal entity they are dealing with? If the answer is no, that is the gap to close, starting with the business name registration and the documents you send out under it.