Offside still depends on where the attacker is when the ball is played—measured against the second-to-last defender. For the 2026 World Cup, FIFA’s semi-automated offside technology will add an audio alert to help officials decide faster, while officials keep
The argument never really leaves the stadium: a player wheels toward goal, the ball is slipped through, and then everything stops—sometimes with relief, sometimes with outrage—because someone was “offside.” At this point, it’s less a rule than a test of patience.
The basic principle is clear enough, even if the details make it hard to feel confident in the moment. The attacking player who makes the final touch to score cannot be past a specific line when the ball is delivered. That threshold is the second-to-last defender—while the goalkeeper is technically considered the last defender.
The offside rule only applies to play in the attacking half of the field. It does not apply on set pieces such as corner kicks or goal kicks.
In practice. it’s the sideline official—the assistant referee—who decides quickly whether the attacker was beyond that threshold when the ball came through. The assistant runs up and down to track both the ball and where the second-to-last defender is. then. if a goal should not count. raises the flag straight up in the air. The on-field referee is expected to see that flag and blow the play dead, disallowing the goal.
What looks like a simple “caught in the moment” call gets tangled with one important permission: a player is not punished for standing in an offside position or going offside after the ball is played. The key is whether, when the ball is delivered to the attacker who will receive it, that attacker is onside.
That’s also why offside decisions can feel so merciless. Referees can stop play before a goal is scored if the offside is clear and obvious to the sideline official. But recent FIFA guidance encouraged officials to let play continue until a natural stoppage—such as the ball going out of bounds. a foul. or a goal—so offside isn’t called prematurely or incorrectly.
Technology, however, has narrowed the margin for doubt. Referees now have the Video Assistant Referee and semi-automated offside technology (SAOT) to examine positions with extremely fine detail. Under the technical specification. if the part of a player’s body that is not permitted to play the ball—hands or arms—is what is offside while the rest of the body is not. offside should not be called.
Still, the standard is not always experienced that way on the pitch. SAOT has declared players offside for a sliver of any body part being past the second-to-last defender, and the rule’s exact execution is one reason the offside debate never truly cools.
So how will it work at the 2026 World Cup in North America?. FIFA will largely follow the same offside enforcement process, but with one significant change designed to debut during the tournament. FIFA’s earlier guidance—encouraging officials to delay raising the flag until a stoppage to avoid wrong or premature calls—has been effectively reversed for this technology-led moment.
This time, advanced SAOT will give an audio alert to sideline officials when an individual player is determined to be offside by at least 10 centimeters. Even then, the official still has discretion over when to lift the flag and make the call.
The goal of the new system is straightforward: prevent unnecessary injuries during play that should not legally be happening once offside is identified. The technology, though, has limitations. It cannot make offside determinations when multiple players are grouped together.
Put together. the tournament promises a faster signal and a more structured decision—while still leaving a human judgment point for officials. Fans may get less time to argue over delays. but they will still have to live with the same core tension: the rule is measured at the instant the ball is played. and at the 2026 World Cup. SAOT’s audio alert will decide what the assistant hears first—even if the flag goes up only when the official chooses.
World Cup 2026 offside rule FIFA semi-automated offside technology SAOT assistant referee VAR soccer rules