The Offside Rule: Your Questions Answered

Offside is football's most argued-about law, and most of the arguments come from a single misunderstanding: being in an offside position is not against the rules. The law has two separate steps, and a player only commits an offence if both are satisfied. Almost everything confusing about offside follows from that structure.

Law 11 of the Laws of the Game, maintained by IFAB, sets out the whole thing in less than two pages. What follows answers the questions that come up most often, each one self-contained.

What Is an Offside Position?

A player is in an offside position if, at the relevant moment, any part of the head, body or feet is in the opponents' half of the pitch and is nearer to the opponents' goal line than both the ball and the second-last opponent.

Two details in that sentence do a lot of work. First, arms and hands do not count — the line is drawn at the top of the shoulder, at the bottom of the armpit, because those are the parts of the body a player may legally score with. Second, the reference point is the second-last opponent, not "the last defender." Usually the goalkeeper is the last opponent and a defender is the second-last, but not always. If the goalkeeper has come forward, the second-last opponent might be an outfield player, and the line moves accordingly.

Being level counts as onside. A player level with the second-last opponent, or level with the last two opponents, is not in an offside position.

When Is Offside Actually Judged?

At the moment the ball is played or touched by a teammate — not when the ball arrives.

This single point explains a large share of disputed calls. A striker who is clearly behind the defence when he receives the ball may have been perfectly onside when the pass was struck, because he ran onto it. To viewers watching the receiving player, the position looks offside; to the law, the only frame that matters is the one at the moment of the pass.

The corollary also holds. A player who is offside at the moment of the pass does not become onside by running back before receiving it.

Why Are Players Sometimes in an Offside Position but Not Penalised?

Because an offside position is only an offence if the player then becomes involved in active play. The law defines three ways that happens:

• Interfering with play — touching or playing the ball passed or touched by a teammate.
• Interfering with an opponent — preventing an opponent from playing the ball by obstructing his line of vision, challenging him for the ball, or making an obvious action that clearly impacts his ability to play it.
• Gaining an advantage — playing the ball after it has rebounded off the goalpost, crossbar, a match official, or an opponent, or after a deliberate save by any opponent.

A player standing in an offside position on the far side of the pitch, taking no part in the move, has committed no offence. That is why goals sometimes stand with an attacker visibly beyond the defensive line.

Can You Be Offside in Your Own Half?

No. The offside position requires the player to be in the opponents' half. A player level with the halfway line is considered to be in his own half, so he cannot be offside.

Can You Be Offside from a Throw-In or Corner?

No. There is no offside offence directly from a throw-in, a goal kick, or a corner kick. This is why crowded six-yard boxes at corners are entirely legal regardless of where attackers stand.

The word "directly" matters. Once the ball has been played on by a teammate after the restart, normal offside conditions resume.

What Happens if a Defender Plays the Ball?

This is the most technically demanding part of the law, and the distinction is between a deliberate play and a deflection.

If an opponent deliberately plays the ball — a considered pass, clearance or attempted control — and it reaches an attacker who was in an offside position, that attacker is not penalised. The defender's deliberate action is treated as a new act, resetting the phase. If the ball simply deflects off an opponent, or rebounds from a deliberate save, no reset occurs and the attacker can still be penalised.

IFAB has published criteria to help officials judge whether an action was deliberate play, considering factors such as whether the ball travelled a distance, whether the player had a clear view and control of the movement, and whether he was under pressure. A stretching defender toe-poking a fast cross away is not making a deliberate play; a defender calmly stepping across to head a looping ball clear generally is.

What Is the Punishment for Offside?

An indirect free kick to the defending team, taken from the position where the offside offence occurred — which is where the attacker was when the ball was played, not where he eventually touched it. Because the kick is indirect, a goal cannot be scored from it without another player touching the ball first.

Why Does the Assistant Referee Delay the Flag?

Because raising it early can wrongly kill a legitimate goalscoring opportunity. Where a tight offside decision coincides with a promising attack, assistants are instructed to keep the flag down, let the passage play out, and signal afterwards if the offence stood. If a goal results and the player was offside, the goal is disallowed and the free kick awarded.

This guidance is the reason for the now-familiar sequence of a goal being scored, celebrated, and then flagged. It is not indecision — it is the deliberate design of the procedure.

How Does Technology Change the Decision?

It changes the precision, not the law. Semi-automated systems track the ball and multiple points on each player's body to establish both the exact moment the ball was played and the players' positions at that instant, then render the outcome as a 3D reconstruction.

What technology cannot remove is the judgement embedded in the law itself: whether a player interfered with an opponent, or whether a defender's touch was deliberate play, remains a human decision. Tracking narrows the factual question of position; it does not answer the interpretive question of involvement.

One practical consequence is that the decision reaches the record as a single line. Whatever the debate, the match feed on a data platform such as RubiScore stores the outcome — offside given, goal disallowed, indirect free kick — with no trace of how contested the call was. The event log tells you what was decided, and the law tells you why.

Common Misconceptions

Several beliefs about offside are simply wrong, and each is worth stating plainly:

• "You can't be offside if the ball goes backwards." False. The direction of the pass is irrelevant; only the positions at the moment of the pass matter. A backward pass rarely produces an offside because the receiver is usually behind the ball, but the law makes no exception for it.
• "The last defender sets the line." Usually true in practice, but the law says second-last opponent, which matters whenever the goalkeeper is out of position.
• "He was interfering because he was standing there." Presence alone is not interference. There must be an obvious impact on an opponent's ability to play the ball.
• "The flag went up late, so it was a bad call." Late flags are the instructed procedure, not an error.
• "Offside is a foul." It is an offence punished by an indirect free kick, and it is not recorded as a foul or considered for disciplinary sanction.

The clearest way to think about the law is as a two-part test applied to a single frozen frame. Was the player in an offside position at the moment the ball was played, and did he then become involved? If either answer is no, play continues. Match event records, including offside decisions and the restarts that follow them, are logged in the live data published on rubiscore.com, and reading them alongside the law is the fastest way to make sense of a decision after the fact.