How Does Offside Work? The Rule Explained

Offside is a position check, not a judgement about intent. A player is in an offside position when they are nearer to the opponent's goal line than both the ball and the second-last opponent, and they are in the opponent's half. The drawn offside you see on a Premier League broadcast is the graphical line the video assistant referee uses to show whether the attacker was ahead at the exact moment the ball was played.

The mechanism

To work out if an attacker is offside, wait for the moment the ball is played, not the moment it arrives. At that moment, the attacker must be behind or level with the second-last opponent to stay onside. The goalkeeper is usually the last opponent, so the outfield defender furthest towards the goal is the second-last opponent.

Three things must be true for a player to be in an offside position:

1. The player is in the opponent's half.
2. The player is nearer to the opponent's goal line than the ball.
3. The player is nearer to the opponent's goal line than the second-last opponent.

Meeting all three conditions only puts the player in an offside position. It does not automatically mean a free kick is given. The player must then interfere with play, interfere with an opponent, or gain an advantage from that position.

Interfering with play is simple: the player touches the ball. Interfering with an opponent is slightly wider. Blocking a goalkeeper's view, challenging a defender, or clearly stopping an opponent from playing the ball can all be an offence. Gaining an advantage usually means being offside and then collecting the ball after it comes back from the post, the crossbar, or a save.

If the attacker is level with the second-last opponent, the offside line has not been crossed. Level is onside, because the law says nearer to the goal line, not level with it.

The drawn line and VAR

The phrase offside drawn does not describe a new rule. It describes the graphic used to check a rule. When a goal is scored and a defender appeals, the VAR team finds the exact frame on which the attacking player's team-mate plays the ball. A line is then drawn from the second-last opponent and another from the attacker. If the attacker's line is nearer to the goal line, the offside is given. If the lines overlap or the attacker is behind the defender, play stands.

The drawn line exists because the margin can be tiny. A foot, a shoulder, or an arm stuck out can decide a goal. That is why offside calls are reviewed with freeze-frames rather than a glance at the replay.

The key limitation is the frame itself. The video review has to pick one moment as the moment the ball is played. A hand, a sleeve, or a toe can appear slightly ahead in that frame. The line is not an opinion, but choosing the frame still involves judgement. This is why the drawn offside can look ridiculous on television even when the final result is technically correct.

History and evolution

The Premier League was founded on 20 February 1992, and its first season was 1992/93 with 22 clubs before the league reduced to 20 clubs in 1995/96. The offside law is much older than that. The league created its own commercial structure, but it inherited the same football laws, including offside.

The league structure matters because it sets the stakes of every decision. Twenty clubs play 38 matches per season, and three points go to the winner of each match. A goal disallowed for offside can change a result, which changes points, and the bottom three are relegated to the Championship. European qualification is also tied to league position: the top four reach the Champions League, fifth and the FA Cup winner go into the Europa League, and the League Cup winner enters the Conference League play-off. Those places are another reason why a single drawn offside line can matter.

The biggest change in the Premier League era is how offside is checked. In the first seasons, the assistant referee's flag was the final word. Now video review is used to check goals, and the drawn line is the public evidence of the check. The rule itself has stayed recognisable: a player cannot gain an advantage by standing ahead of the play when the pass is made.

Edge cases

There are four situations that do not allow offside to be given: a throw-in, a goal kick, a corner kick, and a player in their own half. In those situations, a team can push a striker right up against the opponent's goalkeeper, because the position check does not apply.

A deflection off a defender is one of the trickiest edge cases. If an attacker is behind the defence when the ball is struck and the ball then deflects off a defender, the attacker can still be offside. The decision is based on the moment the ball was played, not the moment it reached the attacker. But if a defender deliberately plays the ball, the phase resets. The law does not punish an attacker for being offside after the opponents have intentionally controlled and passed the ball.

The offside trap uses the same timing. Defenders step forward as the ball is played, pushing the attacker behind the second-last opponent. For the trap to work, every defender has to move as one. One defender who drops too deep leaves the attacker onside.

A player can also be in an offside position and not be penalised. If a striker stands near the goalkeeper but does not touch the ball, block anyone, or gain an advantage, the assistant referee keeps the flag down and play continues.

Key takeaways

• A player is offside if they are nearer to the opponent's goal line than both the ball and the second-last opponent when the ball is played.
• Being in an offside position is not an offence by itself; the player must interfere with play, interfere with an opponent, or gain an advantage.
• The drawn line on television is a VAR graphic, not a separate rule.
• Throw-ins, goal kicks, and corners can never be offside.
• The Premier League has used 20 clubs and 38 match rounds per season since 1995/96, so a single offside decision can change relegation mathematics.

FAQ

Can you be offside from a throw-in or corner?

No. The law says a player cannot be offside directly from a throw-in, a goal kick, or a corner. A striker can stand right next to the goalkeeper at a corner and be onside until the ball is touched by a team-mate.

What does second-last opponent mean?

The last opponent is usually the goalkeeper. The second-last opponent is the outfield defender closest to the goal. An attacker is offside if they are nearer to the goal line than that defender. Level with that defender is onside.

Does VAR draw the offside line every time?

Not in every case. If a goal is checked for offside, the VAR team uses a freeze-frame and a graphic with a line on the second-last opponent and a line on the attacker. If the offside is obvious, the graphic might not be shown, but the check follows the same principle.

If a defender touches the ball, does offside reset?

Not automatically. A deflection off a defender keeps the original moment of the pass, so an attacker can still be offside. A deliberate play of the ball by an opponent resets the phase.