How to Set Up a Company Constitution Australia – Step‑by‑Step Guide

Getting your company off the ground is tough. One thing that trips up many founders is the constitution. You might think it’s optional, but missing it can cause big headaches later. In this guide we walk you through how to set up a company constitution australia, from the first decision to keeping it up to date.

We’ll show you when you need a constitution, how to pick the right version, what to write inside, how to file it with ASIC, and how to keep it fresh. You’ll also see the key findings from a recent analysis of 26 checklist items.

Methodology: We searched "company constitution Australia checklist" on 13 April 2026. Twenty‑five web pages from ASIC, law‑firm blogs, and business‑advice sites were scraped. We pulled 52 checklist items, kept those with clear fields, and ran simple stats on legal references and requirement types.

Step 1: Determine the Need for a Constitution

First, ask yourself if you really need a constitution. Most small proprietary firms can run on ASIC’s replaceable rules. Those rules are the default set for internal governance. If you use all of them, you don’t need a separate document.

But the replaceable rules do not work for every setup. A sole director who also owns all the shares falls under Section 135(1). That rule forces you to follow special rules, which means you need a constitution that overrides the default.

Ask these questions:

• Do I have more than one shareholder?
• Will I need special voting arrangements?
• Am I planning to raise capital or bring in investors?

If you answered yes to any, a custom constitution will give you the control you need.

Using the replaceable rules can be an easy way to manage a proprietary company. The ASIC page explains that the rules cover director powers, meetings, and share rights. ASIC’s guide to replaceable rules shows the full list.

However, the BizTech article notes that a constitution is a contract between the company, its directors, and its shareholders. It lets you set rules that fit your business, not the generic defaults.

Key tip: Even if you start with replaceable rules, you can adopt a constitution later. The Corporations Act lets you pass a special resolution at any time.

Why it matters: A well‑drafted constitution can stop disputes before they start. It tells everyone who can do what and how decisions are made. That clarity is especially important when investors ask to see your governance documents.

Practical steps:

1. List your current share structure.
2. Check if any special‑purpose rules apply (e.g., special purpose proprietary company).
3. Match your needs against the replaceable rules list.
4. If there are gaps, note them for your constitution draft.

We’ve seen founders skip this step and later discover they can’t change a rule without a special resolution. That adds cost and delay.

Step 2: Choose Between Replaceable or Custom Constitution

Now that you know whether you need a constitution, decide which route to take. The choice is between the default replaceable rules and a custom document that you or a lawyer writes.

Replaceable rules are a starter pack. They cover basics like director powers (Rule 2), appointment of managing directors (Rule 7), and remuneration (Rule 9). They are free and require no filing.

But they are generic. A 50/50 joint venture, for example, may want to remove the casting‑vote rule (Rule 1). That is a change you can only make with a custom constitution.

We recommend a custom constitution for any business that expects growth, multiple shareholders, or external investors. It lets you set limits on director authority, define voting thresholds, and include shareholder rights that the replaceable rules don’t address.

Here’s a quick comparison:

Remember, the quick verdict we showed earlier says that the only non‑optional legal requirement is Section 135(1). If that applies, you must go custom.

For more on the pros and cons, see this Sprintlaw comparison of replaceable rules vs constitution. It breaks down when each option makes sense.

Our firm also helped a client who was setting up a tech startup with three founders. They chose a custom constitution to lock in a 2‑year vesting schedule for founder shares. The document saved them from a later dispute when one founder wanted to leave early.

Takeaway: If you need any of the following, pick a custom constitution:

• Multiple shareholders with different rights.
• Preferred share classes.
• Specific director‑remuneration rules.
• Shareholder‑level voting thresholds beyond the default.

Otherwise, the replaceable rules may be enough. Just be sure you understand what they cover.

Action tip: Write down the three biggest governance questions you have. If the replaceable rules answer them, you can stay with the default. If not, you need a custom document.

Step 3: Draft the Constitution Content

Now we get into the nitty‑gritty of what goes in the document. A constitution is a contract, so every clause should be clear and enforceable.

Start with the basics: company name, ACN, and type of company. Then add sections on share structure, director powers, meetings, and dispute resolution.

Here’s a common outline:

• Interpretation , defines terms used later.
• Share Capital , how many shares, classes, and rights.
• Directors , appointment, removal, powers, and duties.
• Meetings , notice periods, quorum, voting rules.
• Dividends , how profits are distributed.
• Borrowing , limits on borrowing without shareholder approval.
• Amendment , how the constitution itself can be changed (usually a special resolution).
• Indemnity , protection for directors against certain liabilities.

Use plain language. Avoid legalese that can cause confusion later. The ClearDocs sample PDF shows a real example of a not‑for‑profit constitution. You can download it to see the layout.

ClearDocs sample constitution PDF gives you a ready‑made template you can adapt.

Watch the video below for a visual walk‑through of drafting key clauses.

When you draft, keep these tips in mind:

1. Use headings that match the outline above.
2. Reference the relevant sections of the Corporations Act (e.g., s198A for director powers).
3. State the exact voting percentages you need for each type of decision.
4. Include a clause that says the constitution can be amended only by a special resolution , this aligns with the legal requirement.
5. Make sure any custom rules do not conflict with mandatory provisions, like the Section 135(1) rule for sole director companies.

One common mistake is to leave a gap where a replaceable rule would apply. If you omit a rule on director resignation, the replaceable rule will automatically kick in. That can surprise you later.

We often see founders try to write their own constitution without legal help. That can work for very simple setups, but the risk of a poorly‑crafted document is high. The research shows that professional drafting is a recommended step to avoid the second most common pitfall.

Another tip: keep a master copy in a secure location and store a signed hard copy with your company records. ASIC may ask for it later.

Step 4: Register the Constitution with ASIC

After the draft is final, you must lodge it with ASIC. The process is straightforward but you need to follow the timing rules.

First, call a meeting of the members. Give at least three weeks’ notice if you are a public company, or four weeks for a proprietary company. The notice must include the full text of the proposed constitution and state that it will be voted on as a special resolution.

At the meeting, you need at least 75% of the votes to pass. Record the resolution in the minutes and have each member sign a copy of the constitution.

Then complete Form 205 , Notification of Resolution , and send it to ASIC within 14 days. Attach a copy of the signed constitution unless you are a special‑purpose proprietary company, which can keep the document internally.

The ASIC page explains the filing steps in detail.

If you miss the 14‑day window, ASIC may charge a late fee. That’s a simple cost to avoid.

Key checklist before you submit:

• Special resolution signed and recorded.
• All members have a copy of the signed constitution.
• Form 205 completed correctly.
• Any required supporting documents attached.

After ASIC processes the filing, you’ll receive a confirmation. Keep that on file , it proves your constitution is legally effective.

Why register? Without ASIC’s acknowledgment, the constitution has no legal force. It also means the default replaceable rules will still apply, which could clash with the custom clauses you wrote.

Our team at SDC Lawyers can help you prepare the Form 205 and double‑check the resolution wording. That extra step saves you a lot of hassle down the line.

Step 5: Maintain and Update Your Constitution

A constitution is not a set‑and‑forget document. Your business will change, and the rules may need to evolve.

Schedule a review at least once every two years. Look for any of these triggers:

• New shareholders join.
• Share class structure changes.
• Board size or director powers need adjustment.
• Regulatory changes that affect mandatory clauses.

If you spot a needed change, draft an amendment and call another special resolution. Follow the same notice and voting rules as the original adoption.

Keep a version history. Note the date, the amendment text, and who approved it. This makes it easy to show compliance if ASIC or a bank asks.

Another practical tip: when you open a corporate bank account, the bank will ask for your constitution. Having an up‑to‑date version avoids delays.

We saw a client who added a new share class after a seed round. They missed the amendment step, and the bank refused to open the account because the constitution didn’t reflect the new class. A quick amendment saved them weeks of work.

Also, watch out for the two common pitfalls highlighted in the research: failing to lodge the constitution and using a poorly‑crafted document. By keeping a regular review schedule, you avoid both.

Here’s a simple maintenance workflow:

1. Mark calendar for a biennial review.
2. Gather any changes in share or director structure.
3. Draft amendment clauses.
4. Send notice to members (3‑4 weeks).
5. Hold meeting, pass special resolution (75%+).
6. Lodge Form 205 with ASIC within 14 days.
7. Update internal records and version log.

By treating your constitution like a living document, you keep your governance strong and your compliance on point.

FAQ

Do I need a constitution if I have only one director?

Yes, if that director also owns all the shares. Section 135(1) requires a special set of rules, which means you must adopt a constitution that replaces the default replaceable rules. For a sole‑director, sole‑shareholder company, the quick verdict points out this is the only non‑optional legal requirement.

Can I switch from replaceable rules to a custom constitution later?

Absolutely. You can adopt a constitution at any time by passing a special resolution of the members. Follow the filing steps we outlined in Step 4, and lodge the new document with ASIC within 14 days. The old replaceable rules will then be replaced.

What happens if I forget to lodge the constitution with ASIC?

If you miss the filing deadline, ASIC may charge a late fee and the default replaceable rules will continue to apply. That can cause a mismatch between the rules you think you have and the ones the law enforces. It’s one of the two common mistakes flagged in the research.

How many votes do I need to amend the constitution?

You need a special resolution. That means at least 75% of the votes cast by members who are present and entitled to vote must be in favour. The notice period for the meeting must be at least three weeks for a public company or four weeks for a proprietary company.

Is a custom constitution more expensive than using replaceable rules?

Yes, you will likely pay legal fees to have a lawyer draft or review the document. However, the investment can save you money later by preventing disputes, aligning shareholder rights, and making your company more attractive to investors.

Do I need a lawyer to draft my constitution?

You don’t have to, but the research recommends professional drafting. A poorly‑crafted constitution can lead to enforcement issues or unintended gaps where replaceable rules will fill in. We at SDC Lawyers can help you draft a solid, compliant document.

What is the difference between a constitution and a shareholders’ agreement?

A constitution is a public contract between the company and its members and is lodged with ASIC. A shareholders’ agreement is a private contract that sits between the shareholders only. The constitution covers core governance matters, while the shareholders’ agreement can deal with things like drag‑along rights or confidentiality.

How do I know if my bank will accept my constitution?

Most banks will ask to see the current constitution when you open a corporate account. Make sure the document is signed, lodged with ASIC, and reflects the share structure you are using. If the bank sees a mismatch, they may delay or reject the account.

Conclusion

Setting up a company constitution australia is not a mystery. First, decide if you need one by checking your share structure and any special‑purpose rules. Then choose between the default replaceable rules and a custom document. Draft clear clauses that match your business needs, lodge the final version with ASIC, and keep it up to date as your company grows.

Remember the quick verdict: the sole‑director/sole‑shareholder rule is the only non‑optional requirement. Get that right, lodge on time, and consider a professional draft to avoid the two common pitfalls.

If you need help at any stage, our team at SDC Lawyers is ready to guide you. Reach out today and let us make sure your constitution is solid, compliant, and tailored to your future plans.