Plebiscites vs Referendums: Key Legal Differences in Australia

Australia gives voters a direct say on big national questions in two main ways: referendums and plebiscites.

On the surface they can look similar - both involve a national vote - but legally they’re very different. One can change the Constitution and bind the government. The other is advisory and primarily used to gauge public sentiment.

In this guide, we’ll clearly explain how each process works under Australian law, where they differ, and why understanding these differences matters for citizens and business owners alike. We’ll also correct a few common myths about “yes/no” cases, how bills get to a referendum, and how territory votes count.

What Is A Referendum In Australia?

A referendum is the only way to change the Australian Constitution. This requirement is set out in section 128 of the Constitution, and it’s one of the most robust direct-democracy mechanisms in the world.

Because the Constitution is our highest law, a referendum’s outcome is legally binding. If the proposal succeeds, Parliament must put the approved change into effect - it’s not optional.

What Does A Referendum Decide?

Referendums decide whether a specific constitutional amendment should be made. The question put to voters is tied to a bill that outlines the exact wording to be inserted into (or removed from) the Constitution.

This is why referendum questions are usually tightly focused: they’re approving or rejecting a precise change to the legal foundations of the country.

How Does The Referendum Process Work?

The referendum process has several legal checkpoints designed to ensure any constitutional change has broad national support.

1) Getting A Proposal To A Vote

• Parliamentary approval: A bill proposing the constitutional change must pass by an absolute majority in both houses (the House of Representatives and the Senate). If one house passes the bill and the other rejects it, section 128 allows a “one-house path”: after a minimum three-month interval, the originating house can pass it again and the proposal can still be put to voters.
• Timing: The vote must occur not less than two months and not more than six months after the bill passes Parliament in the required way.

2) Providing Voter Information

Voters receive official information before polling day. Importantly, the “Yes” and “No” cases are prepared by parliamentarians (not by the Australian Electoral Commission). The Australian Electoral Commission (AEC) administers the process and distributes these cases to voters.

3) Voting And The “Double Majority” Test

Voting in a referendum is compulsory for enrolled voters.

A referendum passes only if it achieves a double majority:

• National majority: More than half of all formal votes across the country (including the territories) are in favour.
• State majority: A majority of voters in at least four of the six states are in favour. Votes in the Australian Capital Territory and the Northern Territory count towards the national majority, but they don’t count as “states” for this second limb.

This two-part hurdle ensures both broad national support and substantial state-by-state backing before the Constitution is changed.

4) Implementing The Result

If the proposal succeeds, the constitutional amendment takes effect as authorised by the referendum bill. Because referendums are binding, the change becomes law.

What Is A Plebiscite (And When Is It Used)?

A plebiscite is a national vote to measure public opinion on an issue that does not involve changing the Constitution. It’s advisory rather than binding.

Plebiscites are created and governed by Acts of Parliament (or by other lawful processes authorising the vote). The enabling law sets the rules for the particular vote - including who participates, whether voting is compulsory, and how the question is asked.

What Can A Plebiscite Decide?

Formally, a plebiscite doesn’t “decide” anything in a legal sense. It provides a clear signal of public sentiment that the government can consider when shaping policy or proposing future legislation.

Historically, Australia has used plebiscites (or plebiscite-like national votes) on topics such as conscription during World War I and the 1977 national song vote. More recently, the 2017 Australian Marriage Law Postal Survey - while not a plebiscite enacted by its own enabling Act - also functioned as a national, advisory gauge of public opinion.

Are Plebiscite Results Binding?

No. Unlike referendums, plebiscite results are not binding on the government. However, they often carry significant political weight, which can influence whether and how Parliament proceeds with policy or legislative changes.

Plebiscites vs Referendums: The Key Legal Differences

Here’s how these two processes diverge in law and practice.

1) Constitutional Impact

• Referendums: The only way to amend the Constitution. Successful outcomes must be implemented.
• Plebiscites: Do not change the Constitution. They act as a formal expression of public opinion to inform policy.

2) Binding Nature

• Referendums: Binding. A “Yes” result compels constitutional change as authorised by the enabling bill.
• Plebiscites: Advisory. The government may respond to the result, but it is not legally required to take any specific action.

3) Who Sets The Rules?

• Referendums: Procedures are embedded in section 128 of the Constitution and relevant legislation (including how the double majority works and compulsory voting).
• Plebiscites: Each plebiscite is established by its own enabling law (or lawful process), which sets the scope, timing, participation, and whether voting is compulsory.

4) Role Of The AEC And “Yes/No” Cases

• Referendums: The AEC administers and distributes materials. The “Yes” and “No” arguments are prepared by parliamentarians, not by the AEC.
• Plebiscites: The AEC may run the vote if required by the enabling law, but there is no constitutional requirement for “Yes/No” booklets unless the legislation provides for them.

5) Territories And The Double Majority

• Referendums: Since 1977, territory votes count towards the national majority. However, only states count for the “majority of states” test - at least four of six states must vote “Yes”.
• Plebiscites: Territory participation is determined by the enabling law for that particular vote.

Why This Difference Matters For Business Owners

You might not work in politics, but these processes can still affect your world. A successful referendum can shape fundamental powers and responsibilities across government. A decisive plebiscite can signal policy directions that later become law.

For small business owners and startups, that means keeping an eye on potential changes that could flow into regulation, consumer protection, privacy settings, employment frameworks, and more. Even when a national vote is advisory, it can set the tone for future reform.

Policy Signals And Planning

If a plebiscite reveals strong public support for a change, it’s reasonable to expect governments to explore related policy or legislative options. That might affect your compliance obligations in areas like pricing, advertising, returns and warranties under the Australian Consumer Law - making it worth revisiting how you manage misleading or deceptive conduct risk and your standard customer communications.

Documentation And Compliance Readiness

Regardless of the political cycle, stable legal foundations protect your business. If you collect any personal information online, you’ll need a clear, up-to-date Privacy Policy that explains what you collect, why, and how you use and store that data.

If your website offers products or services, make sure your Website Terms and Conditions set expectations, limit risk appropriately, and align with your obligations under the Australian Consumer Law.

Structure, Brand And Team

As your venture grows, consider whether your current structure still fits. Many founders start as sole traders and later switch to a company for limited liability and growth - a useful juncture to revisit the classic question of business name vs company name and what each actually covers.

If you have co-founders or investors, a tailored Shareholders Agreement can lock in how decisions are made, what happens if someone wants to exit, and how new capital is raised. And if you’re building a brand you want to own long-term, now is a good time to assess whether to register your trade mark for key names and logos.

Hiring staff? Put well-drafted Employment Contracts in place that reflect your award and policy settings. These documents don’t just tick legal boxes - they also create certainty for your team and reduce the risk of disputes.

Staying Agile As Laws Evolve

The outcome of a referendum can shift constitutional boundaries. The outcome of a plebiscite can accelerate policy proposals that eventually become law. Being legally “match fit” - with clear contracts, up-to-date policies, and the right structure - helps you adapt quickly when change comes through Parliament.

FAQs: Quick Clarifications

Is Voting Compulsory In Referendums?

Yes. Voting is compulsory for enrolled voters in referendums, similar to federal elections.

Is Voting Compulsory In Plebiscites?

It depends on the enabling law for that specific vote. Some plebiscites have been held alongside elections or referendums (where attendance is already high), while others have been voluntary.

Who Writes The “Yes” And “No” Cases For Referendums?

Parliamentarians author the official “Yes” and “No” arguments. The AEC manages the process and distributes the authorised material - it does not write the cases.

Do Territory Votes Count In Referendums?

Yes, territory votes count towards the national majority. However, the “majority of states” test only counts the six states, and at least four must vote “Yes.”

Key Takeaways

• Referendums are the only way to amend the Australian Constitution. They are binding and require a double majority (national and four of six states).
• Plebiscites are advisory votes used to gauge public opinion on non-constitutional questions. Their legal force depends on what Parliament does afterwards.
• For referendums, parliamentarians prepare the “Yes/No” cases and the AEC administers and distributes them - the AEC does not write the arguments.
• Territory votes count toward the national majority in referendums, but only states count toward the “majority of states” limb.
• For businesses, national votes can signal or trigger regulatory change. Keep core documents current - such as your Privacy Policy, Website Terms and Conditions, employment agreements, and brand protection - so you’re ready to adapt.
• If you’re growing, revisit your structure, ownership rules and IP strategy - think company vs business name, a clear Shareholders Agreement, and whether to register trade marks for key brand assets.

If you’d like a consultation about how upcoming legal or policy changes could affect your business, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.