Can you rely on self-defence against an assault charge?
Yes. Self-defence is a complete defence to assault in Victoria, set out in the Crimes Act 1958, and if it succeeds you are found not guilty rather than simply receiving a lighter penalty. It applies across assault charges, from common assault to causing serious injury.
The key point is that acting to protect yourself is not automatically a crime. The law recognises that people are sometimes forced to use force, and it provides a defence when they do so within limits. Our work on how we defend assault charges frequently turns on exactly this defence.
What is the legal test for self-defence in Victoria?
There are two parts, and both must be satisfied. First, you must have believed that your conduct was necessary in self-defence. Second, your conduct must have been a reasonable response in the circumstances as you perceived them. The first part looks at your genuine belief, and the second at whether your response fitted the situation as you saw it.
This test applies to the full range of assault charges, so understanding how assault charges work helps you see where self-defence fits. The table below breaks the two parts down.
| Element | What it means | How it is assessed |
| Belief it was necessary | You genuinely believed your conduct was necessary in self-defence | Subjective – your actual belief, even if mistaken |
| Reasonable response | Your conduct was a reasonable response | Judged on the circumstances as you perceived them |
The two parts work together. A genuine belief is not enough on its own if the response was plainly excessive, and a measured response is not enough if you did not actually believe it was necessary.
Who has to prove self-defence, you or the prosecution?
The prosecution, and this surprises many people. You do not have to prove you acted in self-defence. Once there is evidence that raises self-defence, the prosecution must disprove it beyond reasonable doubt, which is a demanding standard. This is reflected in how juries are directed in criminal trials.
That does not mean self-defence looks after itself. You still need to point to the evidence that puts it in issue, which is where careful preparation matters, and it helps to understand how a criminal case proceeds so the defence is raised properly. The burden sits with the prosecution, but the groundwork is yours.
Can you defend another person, or your property?
Yes to defending another person. Self-defence in Victoria is not limited to protecting yourself, so stepping in to protect a family member, friend, or even a stranger from an assault can fall within the defence, provided the same two-part test is met. The law treats defending others much as it treats defending yourself.
The position on property is narrower and more situation-specific. Conduct to protect property or prevent an unlawful act can be covered in some circumstances, but the more force is used to protect property alone, the harder the reasonableness limb becomes. Where a real threat to a person is involved, the defence is on much stronger ground.
How does self-defence apply in family violence cases?
The law makes specific allowance for it. Section 322M deals with family violence and self-defence, recognising that a person who has experienced family violence may believe their conduct is necessary even when responding to a threat that is not immediate, and may use force greater than the threat and still be acting reasonably. Evidence of the history of family violence is relevant to both parts of the test.
This matters because family violence does not always look like a single, immediate attack. A person defending themselves in that context is judged with the pattern of violence in mind, not just the moment. Where an intervention order or the wider relationship is involved, our work on family violence matters considers the charge and the order together.
What makes a response “reasonable”?
Proportion and context. A reasonable response is one that fits the threat as you perceived it, so the level of force, whether a weapon was involved, and whether you could safely have avoided the confrontation all matter. There is no strict duty to retreat in Victoria, but whether retreat was realistically possible is part of the picture.
Because the second limb is judged on the circumstances as you saw them, a genuine but mistaken perception of danger can still support self-defence. What defeats the defence is a response that goes clearly beyond what the situation called for. For assault, this is all or nothing, as there is no partial defence that reduces the charge, so an excessive response means a conviction.
What should you do if you acted in self-defence?
Get advice before you explain yourself. A self-defence claim can be strengthened or damaged by the first account you give, so think carefully about answering police questions before any interview. A considered account, given with advice, protects the defence rather than undermining it.
From there, the work is to gather and preserve the evidence that supports your version, such as injuries, messages, or witnesses. Strong self-defence evidence is often what leads to charges dropped before court, or to an acquittal if the matter is contested. The earlier this is built, the better the outcome tends to be.
