New York self-defense law lets you use physical force against another person when you reasonably believe it’s necessary to stop an unlawful attack that’s happening or about to happen. Deadly force is a separate, much narrower category. Outside your own home, you generally have to retreat before using it if you can do so safely, and force to protect property alone is mostly off the table. The rules live in Article 35 of the Penal Law, and the distinctions between them decide whether a use of force is justified or criminal.
When You Can Use Ordinary Physical Force
The basic rule is straightforward. You can use physical force against another person when you reasonably believe it’s needed to protect yourself or someone else from unlawful physical force that is either happening or imminent.1New York State Senate. New York Penal Law 35.15 – Justification; Use of Physical Force in Defense of a Person
Two things have to be true. You must have genuinely believed the threat was real, and a reasonable person in your position would have believed the same thing. That two-part test comes from People v. Goetz (1986), where the Court of Appeals rejected a purely subjective standard and required that the defendant’s belief also pass an objective reasonableness check. The jury considers everything the defendant knew and every circumstance surrounding the encounter, then asks whether a reasonable person facing the same situation would have reached the same conclusion.2New York State Unified Court System. People v Goetz
Force also has to be proportionate. You can use as much physical force as you reasonably believe necessary to stop the threat, and no more. When the threat ends, your justification ends with it. A response that made sense in the first seconds of a confrontation can become unjustified moments later if the attacker backs off or is clearly no longer dangerous.
When Deadly Force Is Allowed
Deadly force is treated as a different category. You may use force capable of causing death or serious physical injury only when you reasonably believe the other person is about to use deadly force against you. Even then, you generally have to retreat first if you can do so with complete safety.1New York State Senate. New York Penal Law 35.15 – Justification; Use of Physical Force in Defense of a Person
The statute also allows deadly force, with no duty to retreat, when you reasonably believe the other person is committing or attempting one of a short list of serious felonies:
- Kidnapping
- Forcible rape
- Forcible aggravated sexual abuse
- Robbery
- Burglary of a dwelling or occupied building, under the conditions in the property-defense rules
These crimes are singled out because the legislature judged that they carry such immediate risk of serious harm that retreat should not be required.1New York State Senate. New York Penal Law 35.15 – Justification; Use of Physical Force in Defense of a Person
One point that surprises people: “deadly force” isn’t defined by whether anyone actually dies. Conduct meant only to scare an attacker off can qualify as deadly force if it puts the attacker in imminent danger of death or serious injury. Pointing a firearm to keep someone at bay, for example, is deadly force because of the risk it creates, regardless of your intent.3New York State Unified Court System. The People v Fidel Vega – Memorandum No. 33
The Duty to Retreat and the Castle Doctrine
New York is not a stand-your-ground state. Before you use deadly force, you must retreat if you know you can do so with complete safety for yourself and everyone else. This is the most commonly misunderstood piece of New York self-defense law, and ignoring it can wreck an otherwise valid claim.1New York State Senate. New York Penal Law 35.15 – Justification; Use of Physical Force in Defense of a Person
The duty applies only to deadly force. When you use ordinary physical force to fend off an attack, you don’t have to try to leave first. Once the response crosses into deadly force, though, the law asks whether you could have safely walked away instead.
The big exception is your home. Under the castle doctrine, you have no duty to retreat when you’re inside your own dwelling and you weren’t the initial aggressor.1New York State Senate. New York Penal Law 35.15 – Justification; Use of Physical Force in Defense of a Person If you started the fight, the castle doctrine does not save you even inside your own home.
What qualifies as a “dwelling” matters. The statute uses the burglary-law definition, which generally means a building where someone normally sleeps overnight. Whether attached areas like porches, garages, or yards fall inside that protection depends on how close they are to the living space, whether they’re enclosed, and how the resident uses them. A locked front porch might qualify; a detached shed at the edge of the property probably does not.
Defending Your Home and Property
New York draws a firm line between defending people and defending things. As a general rule, you cannot use deadly force to protect property alone.
You can use reasonable physical force to stop someone from stealing your belongings or damaging your property, but not deadly force. The statute allows only as much force as you reasonably believe necessary to prevent or end the theft or damage.4New York State Senate. New York Penal Law 35.25 – Justification; Use of Physical Force to Prevent or Terminate Larceny or Criminal Mischief
For trespass, you can use reasonable physical force to remove someone, but again, not deadly force. Property-damage crimes follow the same limit, with one exception: arson. Because of the danger fire poses to people, you can use deadly force if you reasonably believe it’s necessary to stop an arson.5New York State Senate. New York Penal Law 35.20 – Justification; Use of Physical Force in Defense of Premises
The most significant exception to the “no deadly force for property” rule is burglary. If you’re inside your dwelling or an occupied building and you reasonably believe someone is committing or attempting a burglary, you may use deadly force when you reasonably believe it’s necessary to stop it. This sits alongside the general castle doctrine and addresses the specific danger burglars pose to occupants.5New York State Senate. New York Penal Law 35.20 – Justification; Use of Physical Force in Defense of Premises The same two-part reasonableness test applies: your belief that a burglary was occurring must have been both honest and objectively reasonable.6New York State Unified Court System. Justification: Use of Deadly Physical Force to Prevent Burglary Penal Law 35.20(3)
Defending Someone Else
The same standards that govern defending yourself extend to defending another person. You can use physical force to protect a third person when you reasonably believe they are facing unlawful physical force, and your response must be proportionate.1New York State Senate. New York Penal Law 35.15 – Justification; Use of Physical Force in Defense of a Person
The trap is misreading who the aggressor is. If you jump in to help someone you believe is the victim but they actually started the fight, you can be treated as an initial aggressor yourself, at least when you participated in starting it or reasonably should have known the person you defended did. When you had no way to know who threw the first punch, you aren’t automatically stripped of your justification defense.7New York State Unified Court System. Justification: Use of Physical Force in Defense of a Person
When a Self-Defense Claim Fails
Justification is not available in three specific situations, even if you genuinely felt threatened.
If you were the initial aggressor, you generally cannot claim self-defense. There is one way back: you have to withdraw from the encounter and clearly communicate to the other person that you’re backing off. If they keep coming after that, you can claim justification again. Simply retreating isn’t enough; the withdrawal has to be communicated so the other person knows the fight is over on your side.1New York State Senate. New York Penal Law 35.15 – Justification; Use of Physical Force in Defense of a Person
You also lose the defense if you intentionally provoked the other person in order to create an excuse to use force. The law will not protect someone who engineered a fight and then claimed necessity.
Finally, self-defense does not apply to mutual combat by agreement that isn’t specifically authorized by law. Two people who agree to settle a dispute physically cannot later say they were defending themselves.1New York State Senate. New York Penal Law 35.15 – Justification; Use of Physical Force in Defense of a Person
Who Has to Prove Self-Defense
This is where New York’s law is more favorable to defendants than many people realize. Justification is not an affirmative defense here. Once you raise it and put forward some evidence to support it, the prosecution has to disprove it beyond a reasonable doubt.8New York State Senate. New York Penal Law 25.00 – Defenses; Burden of Proof
In practice, you don’t have to prove you acted in self-defense. You have to put the issue in play, and then the prosecutor has to convince the jury beyond a reasonable doubt that your actions were not justified. People v. McManus (1986) confirmed that when a defendant presents evidence supporting justification, the trial court must instruct the jury on the prosecution’s burden to disprove it. Leaving that instruction out is reversible error.9CaseMine. People v McManus
What You Face if the Defense Fails
If a self-defense claim is rejected, you face whatever charges the underlying use of force supports, and the penalties climb sharply with the harm caused. Serious injuries typically bring assault charges; a death can bring manslaughter or murder. First-degree assault and first-degree manslaughter are both Class B violent felonies with determinate prison sentences ranging from 5 to 25 years.10New York State Senate. New York Penal Law 120.10 – Assault in the First Degree11New York State Senate. New York Penal Law 125.20 – Manslaughter in the First Degree12New York State Senate. New York Penal Law 70.02 – Sentence of Imprisonment for Violent Felony Offense
A felony conviction also carries lasting consequences beyond prison: loss of the right to possess firearms, difficulty finding employment, and a permanent criminal record.
Criminal acquittal doesn’t end the exposure. Civil lawsuits use a lower standard of proof. In a criminal trial the prosecution must prove guilt beyond a reasonable doubt; in a civil case, the injured party or a deceased person’s family only has to show that your actions more likely than not caused the harm. If your use of force resulted in someone’s death, the family can bring a wrongful-death action for lost financial support, medical and funeral expenses, and other recognized damages under New York’s Estates, Powers and Trusts Law.13New York State Senate. New York EPTL 5-4.3 – Damages A civil judgment can follow you for years even if no criminal conviction results.
What to Do Right After a Use-of-Force Incident
What happens in the hours after an incident can shape the outcome as much as the incident itself. Contact a criminal defense attorney before giving any detailed statement to police. Anything you say during questioning can be used against you later, and the adrenaline and confusion that follow a violent encounter are not conditions in which to narrate events for the record.
Cooperate with basic identification and comply with lawful orders, but hold detailed accounts of what happened until counsel is with you. As soon as you’re able, write down what you remember: the time and location, what the other person said and did, what you perceived as the threat, what options you considered, and who else was there. Note any identifying details for bystanders. Surveillance footage in the area may exist, and your attorney can work to preserve it before it is overwritten.
Self-defense cases turn on specific facts. The framework above sets the rules; courts apply those rules to the exact circumstances of the encounter, which is why understanding the boundaries before you need them matters.