The Offside Rule Explained: Law 11 in Plain English
The offside rule explained simply: what offside position means, when it is actually an offence, the exceptions, and the daylight rule being trialled in 2026.
A player is offside if, at the moment the ball is played to them by a team-mate, they are in the opposition half and any part of their head, body or feet is closer to the goal line than both the ball and the second-last opponent — and they then become involved in play.
Two things in that sentence do most of the work, and missing either is why the rule feels harder than it is:
- The moment that matters is when the ball is played, not when it is received. A player can run onto a pass from an onside position at any speed. Where they end up is irrelevant.
- Being in an offside position is not an offence. It only becomes one if they interfere with play, interfere with an opponent, or gain an advantage.
Offside at a glance
| Question | Answer |
|---|---|
| When is it judged? | The instant the ball is played by a team-mate |
| Which body parts count? | Head, body and feet — not arms or hands |
| Level with the defender? | Onside |
| In your own half? | Cannot be offside |
| From a throw-in? | Cannot be offside |
| From a corner or goal kick? | Cannot be offside |
| Receiving from an opponent? | Not offside |
What “offside position” actually means
Under Law 11, a player is in an offside position if:
- Any part of the head, body or feet is in the opponents’ half, excluding the halfway line, and
- Any part of the head, body or feet is nearer to the opponents’ goal line than both the ball and the second-last opponent
The second-last opponent is usually the last outfield defender, because the goalkeeper is normally the last. But not always — if the keeper has come out, the last two opponents might both be outfield players, and the law still works the same way.
Arms and hands are excluded from the measurement. This is not an arbitrary detail: it is because arms cannot legally score, so giving an attacker an offside call for an outstretched hand would penalise them for something they could not use.
A player level with the second-last opponent is onside. Level is onside; the benefit goes to the attacker.
When an offside position becomes an offence
This is the part the rule’s critics usually skip. Standing in an offside position is legal. The referee only penalises it if the player then does one of three things:
Interferes with play — touches or plays a ball passed or touched by a team-mate.
Interferes with an opponent — prevents an opponent playing the ball by obstructing their line of vision, challenging them for the ball, or making an obvious action that clearly affects their ability to play it.
Gains an advantage — plays a ball that has rebounded off the post, crossbar, an opponent, or come from a deliberate save.
The “obstructing the line of vision” clause is the source of most disputed goals. A player standing offside and doing nothing is fine; a player standing offside in the goalkeeper’s eyeline as a shot goes past them is not.
The exceptions
You cannot be offside:
- From a throw-in
- From a goal kick
- From a corner kick
- In your own half of the pitch
- When receiving the ball directly from an opponent — including from a deliberate pass, clearance or deflection, provided it was a deliberate play and not a deflection off a defender trying to intercept
That last exception carries a caveat added in recent years: a deliberate save by any player does not reset offside. If a goalkeeper parries a shot and an attacker in an offside position scores the rebound, it is offside.
Why it exists
Without it, football becomes a game of goal-hanging. An attacker could simply stand beside the opposing goalkeeper and wait for a long ball.
That is precisely what happened in the 1860s. The earliest codified offside laws were far stricter than today’s — under the original 1863 Football Association rules, a player had to be behind the ball to be onside at all, which made forward passing almost impossible and produced a dribbling game rather than a passing one.
The law has been relaxed steadily since:
| Year | Change |
|---|---|
| 1863 | Any player ahead of the ball is offside |
| 1866 | Three opponents must be between the player and the goal |
| 1925 | Reduced from three opponents to two — goals per game jumped immediately |
| 1990 | Level with the second-last defender becomes onside |
| 2005 | “Active play” definitions formalised |
| 2020 | Arms and hands excluded from the offside line |
The 1925 change is the one that shaped modern football. Scoring rose sharply, and within a few years managers had invented the stopper centre-half to cope — the first recognisably modern defensive system. For more on how the game’s laws were written in the first place, see who invented football.
VAR and the offside line
Video review did not change the law. It changed the precision with which it is applied, and that turned out to be a different thing entirely.
Before VAR, a marginal offside was resolved by an assistant referee’s judgement at full speed, and the benefit of the doubt went to the attacker in practice as well as in principle. With frame-by-frame review and drawn lines, a shoulder ahead by two centimetres became a disallowed goal.
Semi-automated offside technology, now used in the Champions League, World Cup and Premier League, speeds this up using limb tracking and ball-sensor data. It resolves the delay problem. It does not resolve the underlying complaint, which is that the law was written for human judgement and is now applied to millimetre tolerances.
The daylight rule: what is being trialled
This is the proposed fix, and it is being tested right now.
Arsène Wenger — FIFA’s chief of global football development, and formerly Arsenal manager — has pushed since 2019 for a change: an attacker would be onside if any playable part of their body is in line with the second-last defender. Offside would only be called where there is clear daylight between attacker and defender.
IFAB cleared it for trial, and the Canadian Premier League began testing it when its 2026 season kicked off on 4 April.
The intended effect is to restore a margin of advantage to attackers and remove the two-centimetre decisions. Whether it reaches the major leagues depends on what the trial data shows. Nothing about the law as applied in the Premier League has changed.
Frequently asked questions
What is the offside rule in simple terms? You cannot be ahead of the second-last defender at the moment a team-mate passes to you, if you are in the opposition half and you then get involved in the play.
Is level with the defender offside? No. Level is onside.
Can you be offside from a throw-in? No. Nor from a corner or a goal kick.
Can you be offside in your own half? No.
Do arms count for offside? No. Only the head, body and feet are measured, because arms cannot legally play the ball.
Is standing in an offside position a foul? No. It only becomes an offence if the player interferes with play, interferes with an opponent, or gains an advantage.
Has the offside rule changed for 2026? Not in the Premier League or at the World Cup. A “daylight” version is being trialled in the Canadian Premier League from April 2026, but it is a trial, not a law change.
Why is offside so hard to understand? Mostly because two separate tests get compressed into one word: being in an offside position and committing an offside offence. The first is common and legal. Only the second is penalised.
For more of the Laws in plain English, see our guides to how long a football match is and how extra time works.
