ACN (Australian Company Number)
Australian Business & ComplianceAlso: Australian Company Number
Quick definition
An Australian Company Number, or ACN, is a unique nine-digit identifier issued to a company when it is registered with the corporate regulator. Only incorporated companies have one. For marketers it is a signal of business structure, distinguishing a company from a sole trader or partnership, which can matter for targeting and credibility.
How it varies across Australia
The presence of a company number tells you something useful about a business-to-business prospect. An incorporated company tends to be more established and structured than a sole trader, so for some offers the company number is a quiet qualifying signal worth capturing.
See how business-to-business segments vary across Australian industries →What it actually means
An Australian Company Number is the unique nine-digit identifier given to a company when it registers with the corporate regulator. The key word is company. Sole traders, partnerships and trusts do not have an ACN. Only an incorporated company does.
This is where it differs from an Australian Business Number. An ABN is held by any entity carrying on a business, including sole traders. An ACN sits underneath the ABN of a company, identifying the incorporated entity specifically. A company's ABN is usually its ACN with two extra digits at the front.
For marketers the value is as a structural signal. Whether a prospect is an incorporated company or a sole trader tells you something about their size, formality and likely buying process. A company often has more stakeholders, a longer approval chain and a larger budget than a sole operator, which can shape how you target, qualify and message them.
It is also a credibility marker. Displaying an ACN, or finding one on a counterparty, confirms the business is a registered company with the obligations that come with that, which can matter in higher-trust or higher-value dealings.
An ABN says a business exists. An ACN says it chose to become a company.
How it shows up
In marketing operations the ACN shows up as a structural data point on a business-to-business lead, distinguishing incorporated companies from sole traders and partnerships. Combined with the ABN, it helps segment prospects by formality and likely buying process, which can sharpen targeting for offers that suit one structure more than another.
The Australian context
The ACN is specific to the Australian corporate system and is issued by the Australian Securities and Investments Commission when a company is registered. It sits alongside the ABN, which is broader. Many overseas markets fragment or restrict access to company identifiers, whereas Australian company details are publicly searchable, making the ACN a usable signal for local business-to-business marketing.
Where people get this wrong
ACN (Australian Company Number) vs ABN
| ACN (Australian Company Number) | ABN | |
|---|---|---|
| Who holds one | Only incorporated companies | Any business, including sole traders |
| Issued by | The corporate regulator, ASIC | The tax office |
| Signals | The entity is a company | The entity is carrying on a business |
Related terms
Common questions
What is an ACN?
An Australian Company Number, a unique nine-digit identifier issued to a company when it registers with the corporate regulator. Only incorporated companies have one, which is what distinguishes it from an ABN that any business can hold.
What is the difference between an ACN and an ABN?
An ABN identifies any business, including sole traders, for tax and trading. An ACN identifies an incorporated company specifically. A company's ABN is usually its ACN with two extra digits in front, so a company has both.
Why would a marketer care about an ACN?
As a structural signal. Knowing a prospect is an incorporated company rather than a sole trader hints at size, formality and buying process. For offers that suit one structure more than another, it is a useful, free qualifying signal.
Does every business have an ACN?
No. Only incorporated companies do. Sole traders, partnerships and trusts operate without one, so requiring an ACN in a lead form would exclude many genuine small businesses.
About New Rebellion
New Rebellion is a marketing intelligence consultancy. We build tools, score Australian businesses on how their marketing actually performs, and publish Debrief every day. This dictionary is part of how we work in the open.
How we think →