What Is a Company Constitution in Australia?

When you’re building a startup or running a small business, it’s easy to focus on the fun (and urgent) parts: finding customers, refining your offer, hiring your first team member, or raising capital.

But sooner or later, most business owners end up asking a deceptively simple question: what is a constitution (and do I need one for my company)?

In Australia, a “constitution” in a business context usually means a company constitution - a core governance document that helps set the rules for how your company operates. Getting it right early can save you a lot of stress later, especially if you bring on co-founders, investors, or you start scaling quickly.

Below, we’ll walk you through what a constitution is, when it matters, what it typically covers, and how it fits alongside other key documents like shareholders agreements.

What Is A Constitution (In A Company Context)?

Let’s start with the question we see most often from founders: what is a constitution in a company context?

For Australian startups and small businesses, a company constitution is a legal document that sets out the internal rules for managing your company.

Think of it like your company’s “rulebook”. It helps clarify things like:

• how decisions are made
• who can appoint or remove directors
• how shares can be issued or transferred
• how meetings and voting work
• what powers directors have (and any limits)

In Australia, companies are generally governed by:

• the Corporations Act 2001 (Cth)
• replaceable rules (a standard set of default rules in the Corporations Act that may apply depending on your company type and circumstances), or
• a company constitution, which can replace or modify those default rules (in whole or in part)

Many founders choose to adopt a constitution because it gives more control and certainty, especially if the business is not a simple “one director, one shareholder” company forever.

If you’re setting up a company (or already have one), having a properly drafted Company Constitution can help align expectations and reduce confusion as your business grows.

Is A Company Constitution Public?

Usually, a company constitution is an internal document. It’s not routinely published by ASIC in the same way certain company details are.

That said, in practice it can still become accessible or requested. For example, shareholders are generally entitled to obtain a copy, and third parties (like investors, lenders, or buyers) may ask to see it as part of due diligence. So it’s worth treating it as a serious foundational document - not just an administrative formality.

Do I Need A Company Constitution To Run A Company In Australia?

Not always - but in many cases, it’s strongly recommended.

When you register a company in Australia, you can generally choose to:

• operate under the Corporations Act replaceable rules (default rules), to the extent they apply to your company, or
• adopt a company constitution, or
• use a combination (some rules in a constitution, others relying on replaceable rules)

If your company is very simple (for example, you’re the sole director and sole shareholder), you might be able to operate fine on replaceable rules. But as soon as any of the following are true, a constitution becomes much more valuable:

• you have (or plan to have) more than one shareholder
• you want different share classes (e.g. ordinary shares and preference shares)
• you expect to raise capital or bring on investors
• you want clearer control around share transfers
• you want to tailor decision-making rules to your business (rather than rely on generic defaults)

It’s also common for banks, investors, and other stakeholders to expect that a company has a constitution in place.

As part of a proper Company Set Up, it’s worth thinking ahead: what will your company look like in 12-24 months, not just today?

Constitution vs Replaceable Rules: What’s The Difference?

Replaceable rules are default rules set out in the Corporations Act that apply to some companies (depending on their type and structure).

A constitution allows you to tailor (and in many cases override) those default rules. This can be particularly useful if you want to:

• set stricter requirements for key decisions
• create specific processes for issuing shares
• customise meeting, notice, and voting procedures
• reflect how you actually run the business day-to-day

In other words, if you’ve been asking what a constitution is and why people bother with one, a big reason is control - it lets you design governance rules that match your real business needs.

What Should A Company Constitution Include?

There’s no single “perfect” constitution, because the right document depends on your structure, your growth plans, and the risks you’re trying to manage.

That said, many constitutions for Australian startups and small businesses will cover the areas below.

1. Share Structure And Shareholder Rights

This is often where the biggest issues arise later - especially if you raise capital, bring on a co-founder, or someone wants to exit.

Your constitution may deal with topics like:

• how new shares are issued
• whether existing shareholders have “pre-emptive rights” (a right to buy new shares first)
• how dividends are handled (if relevant)
• what happens when shareholders want to sell or transfer shares

Even if you’re not planning an exit right now, it’s wise to think about how ownership can change. A lot of disputes happen because people didn’t talk about this early.

2. Directors, Powers And Decision-Making

Your constitution often outlines how directors are appointed and removed, and what powers they have to run the business.

If you’re not clear on the roles, it can help to understand the difference between a director vs shareholder, because they have very different rights and responsibilities.

Depending on how the company is structured, the constitution might also include:

• rules about director meetings and resolutions
• what decisions need shareholder approval
• what decisions can be made by directors alone

3. Shareholder Meetings And Voting

As your company grows, you’ll likely need formal processes for:

• calling general meetings
• issuing meeting notices properly
• setting quorum requirements (how many people must attend for a meeting to proceed)
• voting thresholds (e.g. ordinary vs special resolutions)

These may sound procedural, but they matter when you’re making high-stakes decisions - like appointing directors, approving major transactions, or changing share rights.

4. How Documents Are Signed

Signing is another area where founders can get caught out, especially when you move quickly and assume an email approval is “enough”.

Your constitution may interact with how your company executes documents, including under the Corporations Act. If this is relevant to you (and it often is once you start signing leases, finance documents, supplier contracts, or investor paperwork), it’s worth understanding signing documents under section 127.

5. Dispute Processes And Internal Administration

Not every constitution includes detailed dispute clauses, but it may include practical governance mechanisms that reduce conflict risk, such as:

• how notice must be given (and when it’s valid)
• how meetings can be held (including using technology)
• how the company keeps minutes and records

These details help make sure your company’s decisions are properly made and enforceable - which becomes very important in disputes, audits, and due diligence.

Company Constitution vs Shareholders Agreement: Do You Need Both?

This is one of the most common questions we hear from founders: if you already have a constitution, do you still need a shareholders agreement?

Often, yes - because they do different jobs.

What A Constitution Is Best For

A constitution is primarily an internal governance document. It sets out the foundational rules for running the company and managing key corporate processes.

It tends to be broader and more structural.

What A Shareholders Agreement Is Best For

A shareholders agreement is a contract between shareholders (and often the company) that sets out how shareholders will manage ownership, decision-making, and exits.

It’s commonly used to address practical commercial realities, such as:

• what happens if a founder leaves the business
• how deadlocks are resolved (e.g. if two shareholders can’t agree)
• restrictions on selling shares to outsiders
• drag-along and tag-along rights (often relevant for exits)
• confidentiality and restraints (in some cases)

For startups with co-founders, investors, or growth plans, a Shareholders Agreement is often just as important as the constitution - and the two should ideally work together rather than contradict each other.

If your documents don’t align, you can end up with confusion about which rules apply (and that’s the last thing you want when you’re trying to make fast decisions).

How Do You Adopt Or Change A Company Constitution?

If you’re setting up a new company, adopting a constitution can be fairly straightforward - but it still needs to be done correctly.

Generally, adopting, repealing or modifying a constitution will involve shareholder approval and proper company records. In some cases, you may also need to notify ASIC about the change within the required timeframe.

Adopting A Constitution When You First Set Up The Company

Many businesses adopt a constitution at the time of incorporation, especially when they’re doing an initial company setup with planned growth in mind.

If you’re starting from scratch and want to get the foundations right, Adopt A Constitution is often a practical step alongside other early legal building blocks.

Changing A Constitution Later

You can usually change (or repeal) a constitution later, but you’ll generally need to:

• follow the correct procedure under the Corporations Act and your existing constitution
• pass the required resolution (often a special resolution)
• properly document and store the updated version
• make any required notifications to ASIC within the required timeframe

From a practical business perspective, changing a constitution can also become politically sensitive if you have multiple shareholders. What feels like a “simple update” might change voting rights, director powers, or share transfer restrictions - so it’s worth approaching changes carefully.

A Quick Reality Check: Templates Can Be Risky

It’s tempting to grab a free template and move on. But if the constitution doesn’t match how you actually run the business, it can create risk instead of reducing it.

For example, you might unintentionally:

• make it harder to raise capital (because your share issue rules are unclear)
• create uncertainty over who can appoint or remove directors
• allow share transfers you never intended to allow
• trigger unexpected approval requirements that slow down decisions

A constitution should support your growth - not become a hidden obstacle when you’re moving quickly.

Key Takeaways

• What is a constitution? In a company context, it’s your company’s rulebook that sets out how the business is governed and how key decisions are made.
• You don’t always need a constitution, but it’s often a smart move if you have (or plan to have) multiple shareholders, investors, or complex growth plans.
• A good constitution commonly covers share rules, director powers, decision-making processes, meetings and voting, and how documents can be executed.
• A constitution and a shareholders agreement often work best together: the constitution sets governance rules, while the shareholders agreement manages the commercial relationship between owners.
• Adopting or changing a constitution should be done properly, with the right resolutions, records, and any required ASIC notifications, so your company decisions are legally effective.
• Getting the document tailored early can help prevent disputes and delays later - especially as ownership changes and your business scales.

This article is general information only and does not constitute legal advice. If you’d like advice on your specific circumstances, you should speak with a lawyer.

If you’d like help with a company constitution (or setting up your company the right way from day one), you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.