Defamation Law in Australia: The Rules That Decide Your Claim

One set of rules, and why that helps you

If you have been defamed, or accused of defaming someone, the rules that decide your position are national. Every state and territory runs a matching version of the Defamation Act 2005. The practical benefit for you: our defamation lawyers can assess a publication that spread across state lines without the answer changing at each border. The one asterisk is Western Australia, which has not adopted the recent reforms, a gap that occasionally matters for national publications and that we check on every multi-state file.

Wherever the material appeared, the first assessment is free: call MK Law on 1800 130 120.

The reforms that rewired how claims start

Four recent changes shape every step you will take.

Serious harm became an element of the claim. You must show the publication caused, or is likely to cause, serious harm to your reputation, and businesses have to show serious financial loss. Courts can decide this question early and knock out weak claims, which means your evidence of harm needs to exist before you start rather than being assembled later.

The concerns notice became mandatory. No Victorian defamation claim can be filed until a compliant notice has been served and 28 days have passed. Drafted well, that letter is your best weapon, and most matters resolve there. Drafted badly, it stalls the claim inside a 12-month limitation period that does not pause while you fix your mistakes.

The single publication rule fixed the clock. Time now generally runs from first publication rather than from every later download, and with a 12-month limit sitting on top of it, acting early is most of the battle.

A public interest defence also arrived for responsible journalism on matters of public concern, sitting alongside the existing truth, honest opinion and privilege defences.

Platforms are now on the hook too

The second wave of reform targeted the internet’s middlemen. In Victoria, digital intermediaries (forum hosts, page operators, search engines) now only get their new defences if they run an accessible complaints process and remove or block defamatory material within 7 days of a complaint. For you, that is a practical lever: a well-aimed complaint now pressures the platform as well as the author. Western Australia remains the main jurisdiction still on the old rules.

Who can sue, and for how much

Individuals, not-for-profits and companies with fewer than 10 employees can sue in defamation. Larger companies use injurious falsehood instead, and defamed directors can sue personally. Damages for non-economic loss are capped at $520,000, indexed each July, with aggravated damages available on top and proven financial loss uncapped. What a claim costs to run, stage by stage, is on our cost to sue for defamation page.

What this means for your matter

None of this is much use until it is applied to your screenshot, your audience and your harm. That is what the free first call does. We tell you whether the four elements are met, which defences the other side is likely to reach for, and what the first stage would actually involve. If the publication was a post or review, start with our social media defamation playbook, then call 1800 130 120 or use the form on this page.