ASIC Company Constitution: What It Is, Why It Matters, How To Set Up

Setting up or scaling a company in Australia is exciting - but getting your governance foundations right is just as important as landing your first customers.

One of the key building blocks is your company’s constitution. You’ll often hear people call it an “ASIC constitution”, because you choose it when you register with the Australian Securities and Investments Commission (ASIC). In practice, it’s your company’s own rulebook - and it can make day-to-day decisions smoother, reduce disputes, and give investors confidence.

In this guide, we’ll explain what a company constitution is, whether you really need one, how it interacts with the Corporations Act, what to include, and the practical steps to adopt or update it as your business evolves.

What Is A Company Constitution In Australia?

A company constitution is a legal document that sets out the internal rules for running your company. It covers how directors are appointed, how shares can be issued or transferred, how meetings are held, who can sign documents, and more.

When you register a company with ASIC, you can either:

• Adopt a tailored constitution; or
• Rely on the “replaceable rules” in the Corporations Act 2001 (Cth).

Replaceable rules are a default set of rules in the Corporations Act that apply unless you opt out by adopting a constitution. Many early-stage companies start with replaceable rules and later adopt a constitution as they grow.

Either way, the rules that govern your company have real-world effects - from how easily you can bring on an investor to whether a director can approve a transaction between board meetings.

Do I Need A Company Constitution Or Will Replaceable Rules Do?

Technically, you don’t need a constitution. The replaceable rules are designed to work for simple, small companies.

However, many founders and investors prefer a tailored Company Constitution because it lets you customise the way your company operates. That can mean fewer roadblocks, clearer decision-making, and better alignment with how you actually do business.

When Replaceable Rules Can Fall Short

Replaceable rules are generic. As your company grows, you’ll likely want to adjust things like:

• Share classes and rights (e.g. dividend preferences or voting rights).
• Director appointment/removal processes that suit your board’s size and cadence.
• Pre-emptive rights or restrictions over share transfers to control the cap table.
• Quorum and notice periods so meetings and resolutions are practical to run.
• Execution of documents under section 127, reflecting your preferred signing method.

Investors, lenders and acquirers often expect a clear, modern constitution before they engage. It’s also common to align your constitution with a Shareholders Agreement so both documents work together.

What Does A Good Constitution Typically Include?

Every business is different, but most constitutions will cover the following areas in plain, workable terms.

1) Shares And Capital

• Classes of shares: ordinary, preference or other classes, and what rights attach to them.
• Issue and transfer of shares: who can approve, pre-emptive rights, drag/tag-along mechanisms.
• Dividends: how and when they can be declared and paid.

2) Decision-Making And Meetings

• Board meetings: quorum, notice, voting thresholds, and the ability to pass circulating resolutions.
• Member (shareholder) meetings: notice, proxies, and voting requirements for ordinary vs special resolutions.
• Deadlock processes: helpful where ownership is 50/50 or decisions could stall.

3) Directors And Officers

• Appointment and removal of directors and officeholders.
• Powers of directors to bind the company, including authority under section 126.
• Conflicts of interest and related party transactions.
• Indemnity and insurance provisions (within legal limits).

4) Signing And Execution

• Rules for executing documents under section 127 of the Corporations Act, including electronic execution if you wish to rely on it.

5) Administrative Matters

• Notices, registers, and record-keeping expectations.
• How to amend the constitution in future (usually by special resolution).
• Winding up provisions.

You can also include bespoke provisions that support your business model. For example, a startup might include convertible share mechanics, while a family business might prioritise transfer restrictions to keep shares within the family.

How Do I Adopt, Amend Or Replace A Constitution With ASIC?

Here’s the practical process you’ll follow at different stages - from first adopting a constitution to updating it as you grow.

Adopting A Constitution At Registration

If you’re registering a new company, you can choose to adopt a constitution as part of setup. This is often the cleanest option because your rules are clear from day one, which helps avoid confusion around director powers and share issues.

If you’re at this stage, consider using a done-for-you Company Set Up with a tailored constitution so you’re not stuck with generic settings that don’t fit your plans.

Adopting A Constitution After Registration

If your company already exists and you started with replaceable rules, you can adopt a constitution later. The usual steps are:

1. Board proposes the change and calls a meeting of members (or uses a circulating resolution).
2. Members pass a special resolution (at least 75% of votes in favour) to adopt the constitution.
3. Keep the signed resolution with your company records, update your corporate register, and provide a copy of the constitution to members on request.

While you don’t generally lodge the constitution document with ASIC for a proprietary company, you do need to notify ASIC of certain special resolutions. Good governance means documenting the resolution properly - a Directors Resolution and a member’s special resolution are typically used.

Amending Or Replacing Your Constitution

You can modify or replace your constitution by special resolution of members. The process is similar to adopting one for the first time:

1. Prepare the proposed amendments or the new version (mark-ups are helpful).
2. Call a members’ meeting or circulate a special resolution.
3. Ensure at least 75% of votes are in favour.
4. Record and keep the resolution with your company records, notify ASIC as required, and circulate the updated constitution to members on request.

It’s smart to plan constitutional updates alongside other structural changes (e.g. creating a new class of shares or updating transfer restrictions) to avoid multiple rounds of resolutions and admin.

Who Can Sign The Resolution And Constitution?

Most modern constitutions clarify how documents are executed. If yours follows the Corporations Act’s execution methods, you’ll typically be using section 127 (two directors, or a director and company secretary, or the sole director/secretary for a single-director company). Ensuring your execution clause aligns with your board makeup will save headaches when signing contracts, banking documents, or investor paperwork.

Constitution Vs Shareholders Agreement: Do I Need Both?

They’re different tools for different (but overlapping) purposes.

• Constitution: A public-facing internal rulebook lodged (or at least notified) via ASIC processes and binding on the company, directors and members as a matter of statute. It covers corporate mechanics.
• Shareholders Agreement: A private contract between the company’s owners and (often) the company itself that covers commercial terms like founder roles, vesting, anti-dilution, exit arrangements, dispute resolution and restraints.

Many companies use both. The constitution sets the framework; the Shareholders Agreement fills in commercial detail and personal commitments between owners. If you have both, they should be aligned so there’s no conflict - for example, transfer restrictions and pre-emptive rights should be consistent across the documents. If you don’t yet have one, it’s worth exploring a Shareholders Agreement alongside your constitution to reduce misunderstandings between founders.

Practical Tips When Drafting Your Constitution

Moving beyond the theory, here are practical, founder-friendly considerations to help you avoid common pitfalls.

Match The Rules To Your Reality

Don’t copy-and-paste a template that assumes a big board, quarterly meetings and complex share classes if you’re a lean startup. Align quorum, notice periods and resolution methods to how you actually operate. For example, allowing written resolutions and electronic meetings saves weeks when timing matters.

Think A Few Rounds Of Funding Ahead

Leaving space for new share classes or investor rights can make your next capital raise faster. Even if you’re not issuing preference shares today, you can ensure your constitution allows for new classes to be created and sets the process to attach rights cleanly.

Control Share Transfers (Without Scaring Off Investors)

Pre-emptive rights and board approval on transfers help you control who appears on your cap table. At the same time, you’ll want clear carve-outs for common scenarios (e.g. intra-group transfers or permitted transfers) that investors expect.

Be Clear On Director Powers Between Meetings

Fast-moving companies need directors to approve day-to-day matters without convening formal meetings. Your constitution and the Corporations Act (including section 126) work together here, so draft with execution authority and delegations in mind.

Keep Execution Simple And Reliable

Spell out how the company signs documents. Align this with section 127 and your board structure so banks, major customers and government bodies accept your signatures without delays.

Sync With Your Other Governance Docs

Make sure your constitution works with your Shareholders Agreement, option plans and any convertible notes. Conflicts create friction. Consistency speeds up diligence with investors and acquirers.

Use Resolutions And Company Records Properly

Keep a clean paper trail. When you adopt or amend your constitution, record a board decision, pass a member special resolution, and file and store everything in your corporate register. A simple Directors Resolution is a good starting point, with any special member resolutions filed alongside.

Special Purpose Companies Need Special Rules

If you’re setting up a special purpose entity (for example, as part of an investment or property structure), consider a tailored Special Purpose Company Constitution so the company clearly reflects its limited purpose and compliance needs.

Common Questions About ASIC And Constitutions

Is A Constitution Lodged With ASIC?

When you register a company, you indicate whether you’ve adopted a constitution. For most proprietary companies, you don’t lodge the full document with ASIC - but you must keep it with your records and provide copies to members on request. If you pass a special resolution to adopt, modify or repeal a constitution, you’re required to notify ASIC of that special resolution within the prescribed timeframes.

Can I Start With Replaceable Rules And Add A Constitution Later?

Yes. Many founders start simple and then adopt a constitution once the company grows, brings on a co-founder or investor, or needs clearer rules. Use a special resolution of members to adopt it and make sure your corporate records are updated.

Do Solo Director Companies Need A Constitution?

It’s not mandatory. But even for a sole director/shareholder company, a short, modern constitution can streamline execution, clarify share capital settings, and make future investment or sale processes easier.

What Happens If My Constitution Conflicts With The Corporations Act?

The Corporations Act prevails where it mandates outcomes. A well-drafted constitution will work with the Act, not against it. This is one reason to use a current, tailored document rather than an outdated template.

How Do We Execute Contracts Day-To-Day?

Your constitution should complement the Act’s execution methods so you can sign under section 127 or authorise others under section 126. Getting this right reduces pushback from banks and counterparties on how your documents are signed.

Step-By-Step: Adopting Or Updating Your Constitution

Here’s a simple roadmap you can follow.

1. Map your needs: future funding, share classes, transfer controls, meeting cadence, and execution method.
2. Draft the constitution: tailor to your company’s goals and align with any existing or planned Shareholders Agreement.
3. Board review: directors review and approve putting the constitution to members, using a formal board minute or Directors Resolution.
4. Member approval: pass a special resolution (75% or more) to adopt or amend the constitution.
5. Recordkeeping and ASIC notifications: file the resolutions in your company register and notify ASIC as required.
6. Rollout: store the constitution with your records, share it with stakeholders who need it, and use it to guide everyday decisions.

If you’re registering a new company, you can bundle these steps by adopting a constitution at incorporation, or use an Adopt A Constitution service to transition from replaceable rules later on.

Key Takeaways

• Your company constitution is your internal rulebook - it shapes decision-making, share movements and how you sign documents.
• Replaceable rules can work for very simple companies, but a tailored constitution gives you flexibility, clarity and investor readiness.
• Focus your drafting on shares, decision-making, director powers, execution and transfer controls, and make sure it aligns with the Corporations Act.
• Adopt or amend your constitution by special resolution, keep clean records, and notify ASIC where required.
• Use a constitution alongside a Shareholders Agreement so your legal framework covers both corporate mechanics and commercial arrangements between owners.
• Plan a few steps ahead - a modern, practical constitution will make future funding, banking and deals faster and smoother.

If you’d like a consultation about drafting, adopting or updating your company constitution, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.