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Professional negligence defences
If you’ve been told a professional is going to fight your claim, that’s not a reason to back down. It’s a reason to understand what you’re up against.
When a professional is sued for negligence, their insurer appoints a legal team. That team’s job — their only job — is to find arguments to reduce or defeat what you’re owed. They’ve done it many times before. And if you don’t know what they’re likely to argue, it’s easy to feel like the ground is shifting beneath you.
Every defence raised against professional negligence claims follows recognisable patterns. Once you understand what each argument actually means — and what it takes to counter it — a legitimate claim doesn’t shrink. It gets clearer. Fair Go Australia works entirely on the claimant’s side. We don’t represent professionals. We don’t advise their insurers. Everything we know about how these defences are run, we know from building cases that have had to withstand them.
The insurance picture
Here’s something worth knowing upfront: in most cases, the professional you’re suing isn’t personally running their defence. Their insurer is.
Almost every licensed professional in Australia — doctors, solicitors, financial advisers, accountants, engineers, architects — is required to hold professional indemnity insurance. When a claim is made against them, the insurer steps in, appoints lawyers, and runs the case. The professional may not even have much say in how it’s handled.
That changes the dynamic considerably. You’re not dealing with someone who made a mistake and is trying to make it right. You’re dealing with a commercial entity whose interests lie in paying as little as possible — or nothing at all. Their legal team will look at your claim from every angle: the timeline, your conduct, the documents, the advice you were given, and the losses you’re claiming. They’ll find the weakest points and push on them.
A well-prepared claim anticipates this. The defences listed below are the ones that come up most often. Knowing them — and building your case to address them from the beginning — is what separates claims that hold up from claims that don’t.
Know what’s coming
There is a set of well-established legal arguments that come up repeatedly in professional negligence litigation across Australia. Not all of them will apply to your situation, and some are stronger than others depending on the facts. Below is a plain-English introduction to each one — with links to the full child pages where you can go deeper.
The professional argues that, in the circumstances, they did not owe you a legal duty to take care. This defence is most often raised where you are not a direct client, or where advice was given in an informal or limited context. Courts apply principles established through Rogers v Whitaker and the broader Donoghue v Stevenson lineage when assessing whether a duty existed on the specific facts.
Even if a duty existed, the professional argues their conduct met the standard expected of a reasonably competent practitioner in their field at the time. This is often the central battleground in the entire case — and it almost always requires independent expert evidence to resolve.
Sometimes a professional accepts they made an error but argues the error didn't cause the loss you're claiming. Under Australian law, establishing causation involves both factual and legal elements — it's not enough to show something went wrong. You have to show that what went wrong is why you suffered the loss you did.
Your own conduct contributed to the outcome. This is one of the most frequently raised defences — not always to defeat a claim entirely, but to reduce the amount recovered. Courts can apportion fault, so even if this argument succeeds in part, it doesn't end the claim. What it can do is bring the damages down.
Under civil liability legislation across Australian states and territories, professionals can argue that others share responsibility for the loss — and that each party should only pay their proportionate share. This matters most in cases involving multiple advisers or service providers.
The professional argues you understood and accepted the risk of the outcome before proceeding. This defence rarely succeeds in professional negligence — professionals cannot simply claim you accepted the risk of their failure by engaging them — but it does get raised, particularly in higher-risk advisory contexts.
The claim was filed too late. This is a serious defence when it applies because a claim filed outside the limitation period is generally gone — regardless of its underlying merits. The rules vary by state, but the starting point across Australia is generally three years from when you knew, or ought reasonably to have known, about the negligence.
After negligence occurs, you are expected to take reasonable steps to limit your loss. If you didn't — if you delayed seeking advice, failed to act on information you had, or made the situation worse — the professional may argue your damages should be reduced to reflect that.
Professionals sometimes include terms in engagement letters or on reports that attempt to cap or exclude their liability. Whether those clauses actually work is a separate question — and often a contested one. The Australian Consumer Law significantly limits what can be excluded in consumer contexts, and courts scrutinise these clauses carefully.
The professional argues either that you suffered no quantifiable loss, or that the loss you're claiming is too indirect — too disconnected from what they actually did — for the law to recognise it. Establishing a clear, documented line between the breach and the loss is part of the foundation of any professional negligence claim.
Most commonly raised
Contributory negligence is the defence that causes the most unnecessary concern. People hear it raised and assume the case is over. It usually isn’t.
Under the civil liability legislation in every Australian state and territory, if a court finds your own conduct contributed to the loss, it reduces damages proportionally. It doesn’t automatically defeat the claim. A 25% finding of contributory negligence means a 25% reduction in what you recover — the professional is still liable for the remaining 75%.
A practical example: your financial adviser recommended an investment that was entirely unsuitable for your risk profile. But you’d also been told — in writing — about certain risks and chosen to proceed anyway. In that situation, a court might find some degree of contributory negligence. That doesn’t mean the adviser escapes liability for the advice they gave. It means the damages are adjusted.
Insurers often raise contributory negligence as a tactical argument rather than a genuine belief that it will succeed in full. It’s a negotiating position — an attempt to reduce quantum. How it plays out depends entirely on the specific facts. For a detailed look at how this defence works, see our page on contributory negligence in professional negligence claims.
Multiple parties
There was a time when you could sue one of several professionals who contributed to your loss and recover everything from them — even if others shared responsibility. That’s largely no longer the position in Australia.
Civil liability reforms across Australian states and territories have replaced joint and several liability with a proportionate liability model for economic loss and property damage claims. Each defendant is now generally responsible only for their own share of the loss. The court assesses the degree to which each party’s conduct contributed, and damages are allocated accordingly.
This matters most when more than one professional was involved. If a solicitor and a financial planner both gave poor advice on an investment decision, the court will apportion fault between them. If you only sued one and not the other, you may not recover the full loss. Getting case strategy right from the outset — identifying every potentially liable party — is essential in these situations. For more detail, see our page on proportionate liability.
Time-sensitive
Of all the defences available to professionals and their insurers, limitation periods are the one that can end a valid claim with no regard for its merits. That’s what makes them worth understanding clearly.
The general position across Australia is that professional negligence claims must be commenced within three years of when you became aware — or reasonably should have become aware — of the negligence. That’s the discovery rule, and it’s the starting point in most states. But the detail matters.
The limitation clock doesn’t start running from when the negligence occurred. It starts from when you discovered it — or when a reasonable person in your position would have discovered it. In cases involving latent defects, long-running failures, or situations where a professional failed to tell you something they should have, that date can be genuinely disputed. If an insurer raises a limitation defence, it’s not automatically the end of the road. For a full explanation, see our page on limitation period defences.
Act before time runs out
Professional negligence claims in Australia must generally be commenced within three years of the date you became aware — or reasonably should have become aware — of the negligence. The rules vary by state, and in some circumstances the clock starts earlier than claimants realise. Missing this deadline can permanently extinguish your right to claim. If you are unsure whether your limitation period is still open, contact our team for a free assessment as soon as possible.
Fine print arguments
Exclusion clauses come up regularly in claims against valuers, accountants, financial advisers, and engineers. The engagement letter has a liability cap. The report has a disclaimer. The contract says damages are limited to the fee paid. Whether any of that actually holds up is a different question entirely.
The enforceability of an exclusion clause depends on several things: how it was presented to you, whether you had a genuine opportunity to understand and agree to it, what the professional relationship involved, and what type of loss is being claimed. Courts don’t read these clauses generously. Where there’s any ambiguity, they tend to apply them narrowly.
The Australian Consumer Law also places hard limits on what professionals can exclude in consumer service contexts. Certain guarantees are implied by law and cannot be contracted out of. A disclaimer buried in fine print that purports to exclude all liability for professional advice doesn’t automatically achieve what it says. For more detail, see our page on exclusion clauses and disclaimers.
Proving your loss
A professional negligence claim requires three things to line up: a duty of care, a breach of that duty, and a loss that flows from the breach. Take away any one of them and the claim doesn’t succeed. The ‘no loss’ defence attacks the third element.
Sometimes a professional will argue the loss simply didn’t happen — that your position would have been the same regardless of what they did or didn’t do. Sometimes they argue the loss you’re claiming is too remote: the chain between what they did and what happened to you is too indirect, or was broken by something else along the way.
The response to this argument lies in the evidence. What was your financial position before the negligence, and what would it have been if the professional had done their job properly? That comparison is what you’re entitled to claim. Establishing it properly usually requires financial records, expert analysis, and a clear documented account of the counterfactual position. For more detail, see our page on remoteness of damage.
Entirely on your side
Every defence described on this page is one our team has encountered — and dealt with — in professional negligence claims across Australia. We work exclusively on the plaintiff side. We do not act for professionals being sued. We do not advise their insurers. We do not take defence briefs. Our entire focus is on helping claimants recover what they lost when a professional let them down.
Understanding how defences are run is fundamental to how we build claims. Before a letter of demand is sent or proceedings are filed, we identify which defences are likely to be raised, assess how strong they are on the specific facts, and structure the evidence to address them. That includes sourcing independent expert evidence on the standard of care, building a detailed and documented loss claim, identifying all potentially liable parties, and assessing the limitation position before any action is taken.
If you’ve been told your claim has no merit — or if you’re simply uncertain about what you’re up against — a free case evaluation is the right first step. We’ll give you a direct, honest assessment of the strengths and weaknesses of your situation, including any defences that are likely to arise.
Go deeper
Each defence is covered in full across our specialist pages. Select the one most relevant to your situation.
Defences in professional negligence claims look very different depending on the facts. The same argument that defeats one claim has no traction in another. A free case evaluation with our experienced legal team is direct, confidential, and carries no obligation. We’ll tell you what defences are likely to arise, how strong they are on your facts, and what we think can be done.
We respond to all enquiries within 1 business day.
Our goal is to help people in the best way possible. this is a basic principle in every case and cause for success. contact us today for a free consultation.
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