Football Offside Rule: Complete Guide

By Sarah Miller · September 30, 2026

What Is Offside in Football (Soccer)?

A player is in an offside position if they are nearer to the opponent goal line than both the ball and the second-last opponent when the ball is played to them.

Breaking Down the Rule

Position vs Offense

Being in an offside position is NOT an offense by itself. A player is only penalized if they are involved in active play: playing the ball, interfering with an opponent, or gaining an advantage.

The "Second-Last Opponent" Explained

Usually this is the last defender (excluding the goalkeeper). If the goalkeeper comes out, the second-last opponent might be an outfield player. The offside line is determined by whichever opponent is closest to their own goal line.

When Offside Does NOT Apply

Own half: A player cannot be offside in their own half of the field
Throw-in: No offside offense from a throw-in
Goal kick: No offside from a goal kick
Corner kick: No offside from a corner kick
Deliberate play by opponent: If a defender deliberately plays the ball, the offside is reset

VAR and Offside

Video Assistant Referee has changed offside decisions dramatically. Semi-automated offside technology uses limb-tracking cameras and AI to draw precise offside lines, reducing controversy and decision time.

Common Misconceptions

Being level with the second-last opponent is NOT offside (level is onside)
A player can be offside even if they never touch the ball (interfering with play)
The offside position is judged at the moment the ball is played, not when received

The Offside Trap

A defensive tactic where defenders step forward simultaneously to catch attackers offside. Risky but effective when coordinated. Requires excellent communication and timing.