FOOTBALL EXPLAINED

Offside Explained — Simply, Then Properly

TL;DR — The 30-second version

A player is offside if they are closer to the goal than the second-last defender when the ball is played to them
The second-last defender is almost always the last outfield player — the last is usually the goalkeeper
Being in an offside position is not a foul by itself — you have to then receive the ball and be "active"
Only attacks can be offside — defenders can never be caught offside
Offside is judged at the exact moment the ball is played, not when it arrives
VAR has made offside decisions more accurate but also more controversial

The Simple Version — One Sentence

You are offside if any part of your body (that you can score with) is closer to the goal than the second-last defender at the moment the ball is played to you.

That’s it. If you’re behind the ball, or level with the defenders, you’re fine. If you’re ahead of all but one of them (the goalkeeper is usually the last one), the assistant referee raises their flag, play stops, and the other team gets a free kick.

Why Does the Rule Exist?

Without the offside rule, attackers could just stand next to the goalkeeper all match, waiting for a long ball to be punted over everyone’s head. The game would be reduced to a long-ball lottery. The offside rule forces attackers to time their runs and stay engaged with the play — which makes football far more interesting and tactical.

The Detail — Breaking It Down

The "second-last defender" — what does that mean?

When people say “the last defender,” they usually mean the last outfield player — because the goalkeeper almost always stays behind them. In practice, you need to be level with or behind the second-last opponent (the last defender in front of the goalkeeper) to be onside.

Example: if a team has their goalkeeper on the goal line and their last outfield defender five metres in front of them, an attacker is onside as long as they are level with or behind that outfield defender when the ball is played. If they’re even a centimetre in front — technically offside.

When is it judged?

The key word is “when the ball is played.” Offside is judged at the exact moment a teammate kicks, heads or touches the ball — not when the ball arrives at the attacker. This is why you’ll sometimes see an attacker sprint from an onside position, receive the ball and score, even though they look like they were ahead of the defence when they got it. If they were onside at the moment the ball left their teammate’s foot, that’s legal.

What body parts count?

Any body part that a player can legally score with — so basically everything except the hands and arms. Even a shoulder ahead of the last defender can be offside, even if the ball ends up being controlled with the feet. This is why VAR sometimes zooms in to an extraordinary level of detail — they’re looking for whether a shoulder or armpit was a few centimetres ahead of a defender.

Being in an offside position is not automatically a foul

Here is the bit that confuses people. Standing in an offside position is not against the rules by itself. A player only commits an offside offence if they are in an offside position AND they then become “actively involved in play” — by receiving the ball, interfering with a defender, or gaining an advantage from their position.

This is why attackers can stand in offside positions without being penalised, as long as the ball isn’t played to them or they don’t interfere with the goalkeeper or defenders.

When Is It NOT Offside?

If you receive the ball in your own half — you cannot be offside in your own half

If the ball comes directly from a goal kick, a corner kick, or a throw-in — you cannot be offside from these restarts

If you are level with the second-last defender — level is not offside. You have to be ahead.

If you are behind the ball when it’s played to you

VAR and the Offside Controversy

VAR (Video Assistant Referee) technology has made offside decisions significantly more accurate. Referees can now review decisions using multiple camera angles and — in the Premier League — semi-automated offside technology that draws lines to judge exactly where each player was at the precise moment the ball was played.

This accuracy has created its own controversy. Decisions that would previously have been impossible to see with the naked eye — a toenail offside, a shoulder one centimetre ahead — are now being given. Many fans argue that if a margin is so small it requires technology to detect, it shouldn’t result in a goal being disallowed. Others argue that a rule is a rule.

The debate about where to draw the line — literally — has been one of football’s most contentious arguments since VAR was introduced. It’s unlikely to be resolved anytime soon.

For the full story on VAR — what it reviews, its most controversial decisions, and the arguments for and against — read our VAR explained page.