Self-defence in New South Wales.

What is the self-defence law in NSW?

Self-defence in New South Wales is statutory. It lives in Part 11 of the Crimes Act 1900, at sections 418 to 423, and the text is on the NSW legislation site. It was put there by the Crimes Amendment (Self-defence) Act 2001, which set out to codify the common law and to repeal the old home invasion legislation. Section 423 makes the Division apply to offences committed before or after it started, except where proceedings had already been instituted.

Section 418(1) is the short version: a person is not criminally responsible for an offence if the person carries out the conduct constituting the offence in self-defence. Section 418(2) then does the work. A person acts in self-defence if and only if the person believes the conduct is necessary to defend themselves or another person, to prevent or terminate the unlawful deprivation of liberty of themselves or another, to protect property from unlawful taking, destruction, damage or interference, or to prevent or stop a criminal trespass to land or premises. Alongside that belief, the conduct has to be a reasonable response in the circumstances as the person perceives them.

Two limbs, and they are asked in different registers. The first is subjective. Did the accused actually believe the conduct was necessary? The jury considers the circumstances as the accused perceived them, taking into account any personal attribute bearing on that perception. The second is objective. Was what the accused did a reasonable response to the circumstances as the accused saw them? Not to the circumstances as they turned out to be, and not as a bystander would have judged them with the benefit of hindsight. Howie J set out the questions in R v Katarzynski [2002] NSWSC 613 at [22] to [23], and the Court of Criminal Appeal approved them in Abdallah v R [2016] NSWCCA 34 at [61]. Both are on JADE.

Who is the burden of proof on for self-defence?

The Crown, and only the Crown. Section 419 says that where the Division is raised, the prosecution has the onus of proving beyond reasonable doubt that the person did not carry out the conduct in self-defence. This is the point people get wrong most often. An accused person does not have to prove they were defending themselves. They do not have to give evidence at all.

What an accused does have to do is get the issue into the case. Self-defence is left to the jury where there is evidence capable of supporting a reasonable doubt about whether the prosecution has excluded it: Colosimo v DPP [2006] NSWCA 293 at [19]. That evidence can come from the Crown's own witnesses, from the CCTV, from an admission in the recorded interview, or from the complainant under cross-examination. It does not have to come from the accused. Even a tactical decision not to run self-defence does not always relieve a trial judge of the duty to leave it to the jury.

Once it is in, the Crown can knock it out in one of two ways, and it only needs one. It can prove beyond reasonable doubt that the accused did not believe the conduct was necessary. Or it can prove beyond reasonable doubt that the conduct was not a reasonable response in the circumstances as the accused perceived them. If the Crown fails on both, the verdict is not guilty. The Judicial Commission of NSW sets out the directions a judge gives a jury on exactly this sequence.

Can I fight back to defend myself?

Yes, within limits, and the limits are set by proportion rather than by any rule about who threw the first punch. There is no duty to retreat in New South Wales. The availability of an escape route is something a jury can weigh when it asks whether the response was reasonable, but a failure to run away is not fatal to the defence. Nor does a person have to wait to be hit. A response to a threatened attack can be self-defence, and courts recognise that a person may act before the blow lands.

The second limb is where most of these cases are won and lost. A jury considers the whole of the response: the nature of the force, its degree, and the means by which it was used. One punch to stop an advancing attacker is a different thing from continuing to strike a person on the ground. The law does not demand a measured reply. Judges routinely tell juries that calm reflection cannot be expected of a person under attack, and that hindsight is not the standard. A response can be wrong, even mistaken about the danger, and still be reasonable in the circumstances as the accused perceived them.

Intoxication has a split role here, and the split is precise. The accused's self-induced intoxication must be taken into account when a jury decides whether the accused believed their conduct was necessary, and when it decides what circumstances the accused perceived. It must not be taken into account when the jury decides whether the response to those circumstances was reasonable: R v Katarzynski at [28]. The jury asks what a sober person would have done in the circumstances as the accused, drunk, perceived them. Self-defence is available to charges from common assault and assault occasioning actual bodily harm through to reckless wounding, wounding with intent, and murder.

Can you legally defend yourself in Australia?

Every Australian jurisdiction recognises self-defence. What differs is the wording and the reach. The NSW statutory form covers more than the defence of the person. Section 418(2) extends to protecting property from unlawful taking, damage or interference, and to preventing a criminal trespass or removing a trespasser. A person who uses force to stop a car being stolen or to remove an intruder is within the section, provided the response is reasonable.

Section 420 draws the hard line. The Division does not apply where a person uses force involving the intentional or reckless infliction of death only to protect property, or only to prevent or stop a criminal trespass. Property is not worth a life, and the law says so plainly. Section 422 answers the other common question. Self-defence is not excluded merely because the conduct being responded to was lawful, or because the other person is not criminally responsible for it. A person defending themselves from a child, or from a person suffering a mental health impairment, or from someone acting under a lawful authority they did not know about, is not shut out of the defence for that reason alone.

Is self-defence a complete defence to manslaughter?

It can be a complete answer to both murder and manslaughter. If a jury is not satisfied that the Crown has disproved either limb, an accused charged with murder walks on both counts. Section 421 covers what sits between a complete defence and a murder conviction, and it is the reason self-defence in a homicide trial is run in a set sequence.

Section 421 applies where the person uses force involving the infliction of death, the conduct is not a reasonable response in the circumstances as the person perceives them, but the person believed the conduct was necessary to defend themselves or another, or to prevent or end an unlawful deprivation of liberty. The person is then not criminally responsible for murder, and on a trial for murder is to be found guilty of manslaughter instead, provided the other elements of manslaughter are made out. Lawyers call this excessive self-defence. Note the limits built into section 421: the belief has to be about defending a person or preventing a loss of liberty, not about protecting property.

In a murder trial the jury takes it in order. It considers the first limb first. If the Crown has not disproved the accused's belief that the conduct was necessary, the verdict on murder is not guilty. The jury then turns to the second limb. If the Crown has also failed to prove that the response was unreasonable, the verdict on manslaughter is not guilty as well. If the Crown proves the response was excessive, the verdict is not guilty of murder but guilty of manslaughter. Our note on murder and manslaughter in NSW sets out how excessive self-defence sits beside the other partial defences.

What is legal for self-defence in NSW?

Section 418 asks about the response, not about a list of approved tools. But carrying something for self-defence is a separate offence question, and the answer surprises people. A taser, a stun device and capsicum spray are prohibited weapons under Schedule 1 of the Weapons Prohibition Act 1998. Possession without a permit carries a maximum of 14 years, and personal protection is not accepted as a genuine reason for a permit. Our note on prohibited weapons sets out the scheme. Carrying a knife in a public place without a reasonable excuse is an offence under section 11C of the Summary Offences Act 1988, and self-defence is not a reasonable excuse.

So a person can be acquitted of an assault on the basis of self-defence, and still be convicted of possessing the weapon they used. The two questions run on separate tracks. The same point holds where the person being resisted is a police officer. A person may use reasonable force to resist an unlawful arrest, but an arrest that is lawful cannot be resisted, and the charge of assaulting or resisting police turns on whether the officer was acting in the execution of duty.

How the defence is built.

Self-defence cases are made from the detail of the moment, and the detail is usually gone within days. What the parties said before the first blow. Whether there was a weapon and who produced it. The size and number of the people involved. Prior threats. Injuries on both parties, photographed early. CCTV from the venue or the street, which is often overwritten within a fortnight if nobody asks for it. The account a client gives to police in a recorded interview will be replayed to a jury, and our note on the recorded police interview explains why that account should not be given without advice.

Self-defence is also available in the Local Court, where the magistrate applies the same test on a plea of not guilty to common assault or affray. The burden does not shift there either. The Crown still has to eliminate the defence beyond reasonable doubt. In practice the difference is that the tribunal of fact gives reasons, and the case is often decided on which account of a short and confusing incident the magistrate accepts.

Frequently asked.

What is the self-defence law in NSW?

Sections 418 to 423 of the Crimes Act 1900. Section 418(2) sets a two-limb test: the person must believe the conduct is necessary to defend themselves or another, to prevent an unlawful loss of liberty, to protect property, or to stop a criminal trespass; and the conduct must be a reasonable response in the circumstances as the person perceives them. The first limb is subjective, the second objective.

Who is the burden of proof on for self-defence?

The prosecution. Section 419 requires the Crown to prove beyond reasonable doubt that the person did not act in self-defence. The accused never has to prove it. They only have to point to evidence capable of raising a reasonable doubt, and that evidence can come from the Crown's own witnesses.

Can I fight back to defend myself?

Yes, if you believe the force is necessary and it is a reasonable response to the situation as you see it. There is no duty to retreat in NSW, and you do not have to wait to be struck first. The limit is proportion. A response far beyond what the perceived danger called for will fail the second limb of section 418.

Can you legally defend yourself in Australia?

Yes. Every jurisdiction recognises self-defence. In NSW the statutory form in section 418 also covers defending another person, preventing an unlawful deprivation of liberty, protecting property and stopping a criminal trespass. Section 420 removes the defence where a person intentionally or recklessly kills only to protect property or to deal with a trespasser.

Is self-defence a complete defence to manslaughter?

It can be. If the Crown fails to disprove both limbs, an accused charged with murder is not guilty of murder and not guilty of manslaughter. Section 421 covers the middle case: a genuine belief that the conduct was necessary, but a response that was not reasonable. That produces a verdict of not guilty of murder but guilty of manslaughter. It is called excessive self-defence.

What is legal for self-defence in NSW?

The law asks whether the response was reasonable, not whether the method was on an approved list. Carrying a weapon is a separate question. A taser, a stun device and capsicum spray are prohibited weapons under the Weapons Prohibition Act 1998, and self-defence is not a genuine reason for a permit. Carrying a knife in public without a reasonable excuse is an offence, and self-defence is not a reasonable excuse.

To speak to a criminal defence lawyer, call Aaron Kernaghan on 0421 717 019.

This article is written by Aaron Kernaghan, criminal defence lawyer at Good Legal Lawyers, as at 9 July 2026. It is commentary and reflects the personal opinion of the author only. It is not legal advice, it is not a substitute for advice on your own matter, and it does not purport to be accurate or complete. Any matter referred to may be before the court and any person charged is presumed innocent. For advice on a specific matter, contact Aaron Kernaghan on 0421 717 019 or contact the firm.

More criminal-law commentary by Aaron Kernaghan.

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