Law 11 offside full guide: what counts as offside?

Law 11 offside stops attackers from camping near the opponent's goal waiting for a tap-in. In the Premier League, a player is in an offside position if any part of the head, body or feet is in the opponents' half and nearer to the opponents' goal line than both the ball and the second-last opponent. The offence, however, only happens when the player becomes active at the moment a team-mate plays the ball.

The most misunderstood part of the rule is that position alone is not an offence. A striker can loiter in the six-yard box while a move breaks down and stay completely legal, as long as they do not touch the ball or interfere with the defenders. Most arguments about offside are actually arguments about the phrase active play, not about where the attacker was standing.

There are 20 clubs in the Premier League and each plays 38 matches, which adds up to 380 matches per season. In every one of those matches the offside line sits behind the attack, and a single offside call can take away a goal that would have changed a club's season. When the assistant's flag goes up, the question is not only where the attacker is, but also when the ball was played and whether the attacker got involved.

How it works

Offside is judged at the moment the ball is played or touched by a team-mate. Not when the ball arrives, not when the attacker starts their run, and not when the crowd shouts. The moment of contact is the only frame that matters. If the attacker is in an offside position at that moment and then becomes active, the referee stops play.

The position is defined by three parts. First, the attacker must be in the opponents' half. Second, the attacker must be nearer to the opponents' goal line than both the ball and the second-last opponent. Third, the attacker must be involved in active play. If any of those three parts is missing, there is no offside offence.

The phrase second-last opponent is important because goalkeepers are not special in this law. The law does not say last defender. It says the second-last opponent, and the goalkeeper usually fills one of those two spaces. If the goalkeeper is out of goal, the last two players are often one defender and the goalkeeper behind them. The attacker must be ahead of both.

A player cannot be offside in their own half. The halfway line is the boundary. When a long ball is played over a high defence, referees look for the line of the second-last opponent, then check which half the attacker is in. This is why defenders try to step up as one unit. If the attacker is level with the second-last opponent, they are onside.

Key details

There are three ways for a player in an offside position to become active. The first is interfering with play by touching the ball. The second is interfering with an opponent by blocking their line of sight, challenging for the ball, or making a movement that stops the opponent from playing the ball. The third is gaining an advantage from being in that position.

The gaining advantage part explains most of the arguments in the penalty area. When a shot rebounds from the post and an attacking player taps in the rebound, the goal is disallowed if that attacker was offside when the shot was taken. The same happens when a goalkeeper saves a shot and the ball drops to an attacker who started the phase in an offside position. The rebound does not reset the offside rule.

Deliberate play by an opponent does reset the rule. If a defender deliberately plays the ball and the attacker then collects it, the attacker is no longer offside. But a deliberate save is an exception. A save counts as preventing the ball from entering the goal, not as a deliberate pass or clear. This is why a goalkeeper's touch rarely rescues an offside attacker.

There is no offside from a goal kick, a throw-in, or a corner kick. This is a specific exemption in Law 11. An attacker can stand directly in front of the goalkeeper from a corner and be onside. The same attacker can receive a short throw-in while behind everyone and be legal. Once the ball is touched by a second player, the normal offside rule applies again.

Arms and hands are ignored when measuring offside position. The law uses the head, body and feet. A long reach is not enough to be offside, and an attacker cannot score with the arm anyway. The position of the body is what officials measure when a forward and a defender are shoulder to shoulder.

Common confusions

The most common confusion is timing. People watch a pass land in front of a runner and say the runner was offside because they were ahead of the defender when they received the ball. That is not the test. The test is the position at the moment the ball was played. A fast attacking player can time a run from behind the defender and be clearly onside even if they collect the ball clear of the defender.

Another confusion is the idea that being the last man is an offence. There is no last man rule. An attacker can be behind the last defender and still be onside if they are behind the ball or level with the second-last opponent. The second-last opponent is the line, not the final defender.

A third confusion is around deliberate play. Fans see a defender touch the ball before the attacker arrives and assume that resets everything. It does not. A deflection is not deliberate play, and a save is not deliberate play. The officials have to judge whether the defender had time to play the ball deliberately. A block that leaves the ball at an attacker's feet usually does not reset offside.

A fourth confusion is the corner rule. People think offside does not exist from a corner, then get confused when the ball is cleared and the next pass is flagged. The exemption only applies to the direct delivery from the corner. The seconds after the delivery are back under the normal rule.

Law 11 offside in the 38-match season

The Premier League has 20 clubs, so every club plays 38 matches and the season contains 380 games. Those matches are decided by small margins, and offside calls are part of those margins. A correctly raised flag can rule out a goal that would have kept a club above the bottom three in the Championship fight. A missed offside can do the opposite in the race for the top four. The same law applies in the FA Cup, where the winner earns a Europa League place.

The offside law has held its basic shape for generations: position, moment, involvement. In the Premier League, the helpers make it faster, but the test is the same. Players who are in an offside position but not active stay legal. Players who are active and in an offside position at the moment of contact get flagged.

FAQ

What is the easiest way to understand offside? Think about the moment the pass is played. If the attacker is closer to the opponent's goal line than both the ball and the second-last opponent, and then takes an active part in the move, it is offside. If any of those parts is missing, there is no offence.

Can you be offside from a throw-in? No. Receiving the ball directly from a throw-in is not an offside offence. The same exemption covers goal kicks and corners, but only for the direct delivery. Once another player touches the ball, the normal rule applies.

What counts as interfering with an opponent? Blocking the goalkeeper's line of sight, challenging a defender for the ball, or making a move that stops the defender from playing it all count as active involvement. Standing still and letting the ball run past is normally not enough.

Why do defenders step up to play offside? Defenders step up so the attacker is caught nearer to the opponent's goal line than the second-last opponent when the pass is played. If the timing is right, the attacker is offside. This is the offside trap, and it works because the law judges the moment of the pass.

Law 11 offside is not a mystery once you separate position from involvement. The Premier League applies the same test in every one of its 380 matches, and the calls that follow shape title races, relegation battles and cup runs.

Key takeaways

• Offside position alone is not an offence; the player must become active in play.
• The timing is the moment the ball is played, not the moment the ball is received.
• The reference point is the second-last opponent, not the last defender.
• A player cannot be offside in their own half, or directly from a goal kick, throw-in or corner.
• Deliberate play resets offside, but a deliberate save does not.