GUIDES · BETSLIP DOCTOR
When may an NBA inbounder run the baseline, and what makes an ordinary throw-in illegal?
An ordinary thrower-in must use the designated spot, stay within its one-step allowance, and release within five seconds after receiving and controlling the ball. A player may run along the endline only in the stated post-score, qualifying free-throw, or period-start situations. Nine separate thrower restrictions and a limited late-game pass-direction exception also apply. This guide follows NBA Official online rule pages checked October 15, 2026; they do not identify a season-specific edition or establish a verified 2026–27 rulebook.
For NBA readers trying to understand the stated playing-rule sequence, with all material facts stipulated. · Updated
Start with the throw-in spot
For an ordinary throw-in, the thrower receives a designated spot and may move only within the one-step allowance to the left or right. The thrower must release the ball within five seconds of receiving and controlling it.
The endline option is narrower: after a made field goal, a free throw following a personal foul, or at the start of the second, third, or fourth period, the thrower may run along the endline or pass to a teammate who is also out-of-bounds there. The game and overtime periods themselves start with a center jump ball.
Nine ways an ordinary thrower-in can violate the rule
Until the throw-in pass crosses the boundary plane, no player may have any part of the body over the boundary line. The thrower also cannot leave the playing surface to gain an advantage or touch the ball first on court. Teammates of the thrower cannot take a parallel or adjacent baseline position when an opponent wants it, and the defense must be allowed to stand between its player and the basket.
- Carry the ball onto the court.
- Fail to release within five seconds after receiving and controlling it.
- Touch the ball on court before another player has touched it.
- Leave the designated spot beyond the one-step allowance to the left or right.
- Throw so the ball enters the basket before a player on court touches it.
- Step onto the court over the boundary before releasing the ball.
- Throw the ball out-of-bounds without it being touched by a player in the game.
- Leave the playing surface to gain an advantage on the throw-in.
- Hand the ball to a player who is on court.
A pass must travel directly inbounds and usually stay in the frontcourt
A throw-in must be sent directly inbounds. If an untouched throw-in goes out, it returns to the original throw-in spot. A throw-in from the frontcourt or midcourt ordinarily must go into the frontcourt, subject to the stated late-game exception.
During the final two minutes of the fourth period or overtime, the pass may go anywhere. But if it is thrown into the frontcourt and an offensive player fails to control it and causes it to go back, that team cannot be first to touch it in the backcourt.
After a made field goal, the text also permits passing to a teammate behind the endline. The online sentence about the five-second rule in that clause is incomplete, so this guide does not decide whether that teammate pass starts a new five-second count.
The violation changes the inbound spot, not every clock question
The stated penalty for a thrower-in violation is loss of possession at the original throw-in spot. That is different from an untouched pass that leaves the court, which the throw-in rule returns to its original spot as well, but for a separately stated reason.
Ball disposal, the moment a throw-in is released, and the game clock starting are separate events. This guide does not turn release into a general clock-reset rule or decide timeout-advance eligibility.
Ordinary and endline throw-in examples
Hypothetical: Team Pine’s sideline inbounder stays within one step of the designated spot and releases three seconds after first receiving and controlling the ball. On another throw-in, the same inbounder runs well beyond that spot; the endline exception does not apply. After a stipulated made field goal, Pine’s first inbounder passes behind the endline to a teammate, and the eventual throw-in is released three seconds after the first player gained control; the timeline stays within five seconds without deciding whether the count restarts. In the final two minutes of the fourth period, a lawful inbound may be directed to a backcourt teammate. If instead it first goes to a frontcourt teammate who fails to control it and causes it to return, Pine cannot be first to touch in backcourt. A separate untouched pass out returns to its original spot; a direct basket or a first on-court touch by the thrower is prohibited.
Related questions
Can an inbounder run the baseline on any throw-in?
No. The cited text limits that option to the stated score, qualifying free-throw, and period-start situations.
Can a late-game throw-in always go to the backcourt?
The direction exception is limited to the final two minutes of the fourth period or overtime and keeps the separate frontcourt-failed-control restriction.
Sources and further reading
- NBA Official, Rule No. 8: Out-of-Bounds and Throw-In, Section III(a)–(f), including the late-game exception; online text checked October 15, 2026, with no season edition identified
- NBA Official, Rule No. 10: Violations and Penalties, Section III, all nine restrictions and penalty
- NBA Official, Rule No. 6: Putting Ball in Play – Live/Dead Ball, Sections I(b)–(c), II and III
- NBA Official, Rule No. 4: Definitions, Sections XII and XIII, Throw-In and Last Two Minutes
- NBA Official, Comments on the Rules, Section II(A)(2), throw-in positioning