NFL

In the preseason, prior to 1973 and since 2021, games that are tied at the end of four quarters end in a tie.

In the regular season and playoffs, if a game is tied at the end of four quarters, overtime is played. In overtime, a coin toss is used to determine which team will possess the ball first. The winner of the coin toss can choose to give the ball or receive the ball. In a regular season, if the first possession results in a touchdown (by the receiving team or by the defensive team on a turnover) or the defensive team scores a safety, the scoring team wins. If the receiving team fails to score and loses possession, the game goes into sudden death, and the first to score wins. However, if the initial receiving team only scores a field goal, the game is not automatically over and the other team is given an opportunity to possess the ball as well. The other team can win with a touchdown, tie with a field goal leading to sudden death or lose if they fail to score.

In a playoff, both teams will have the opportunity to possess the ball. If the score is tied after each team has possessed the ball, the next score wins. However, if the team kicking off to start the overtime scores a safety on the receiving team's initial possession, the team that kicked off is the winner.^[2]

During the regular season in the NFL, one overtime period is played (with each team receiving two-time outs). If the game is still tied after the 10-minute overtime, the game officially ends in a tie. In the playoffs, overtime periods continue until a winner is determined. Overtime follows a three-minute intermission after the end of the regulation game. Prior to the start of overtime, a coin flip is performed in which the captain of the visiting team calls the toss. The team that wins the coin flip has the option either to receive the kickoff or choose the side of the field they wish to defend. Ties are rare in the NFL;^[3] the most recent being a game between the Washington Commanders and New York Giants on December 4, 2022, which ended in a 20–all tie. See List of NFL tied games for more games.

World Football League

The defunct World Football League, in its first season of 1974, used an overtime system more analogous to the system long used in international soccer. The overtime consisted of one 15-minute period, which was played in its entirety and divided into two halves of 7½ minutes each, with each half starting with a kickoff by one of the teams. The league changed to the NFL's sudden-death format for its final season in 1975.^[13]

College and high school

In college and high school football, an overtime procedure (the Kansas plan) ensures that each team has equal opportunity to score. In college, both teams are granted possession of the ball at their opponents' 25 yard-line in succession; the procedure repeats for next possession if needed; all possessions thereafter will be from the opponent's 3-yard line. A coin flip takes place, with the winning team having the option either 1) to declare that they will take the ball first or second, or 2) to decide on which end of the field the series will occur (both teams' series occur on the same end of the field). The losing team will have the first option in any subsequent even-numbered overtime. In the first overtime, the team with the first series attempts to score either a touchdown or a field goal; their possession ends when either a touchdown or a field goal have been scored, they turn the ball over via a fumble or an interception, or they fail to gain a first down. After a touchdown, a team may attempt either an extra-point or a two-point conversion. However, if the team on defense during the first series recovers a fumble and returns it for a touchdown, or returns an interception for a touchdown, the defensive team wins the game. (This is the only way for a college overtime game to end without both teams having possession.) Otherwise, regardless of the outcome of the first team's series (be it a touchdown, field goal, or turnover), the other team begins their series. If the score remains tied after both teams have completed a series, the procedure is repeated, but if a touchdown is scored, a two-point conversion will be required. Since 2021, if the game is still tied after double overtime, each team attempts one 2-point conversion per period rather than getting the ball at the 25-yard line.^[14]

In high school football, individual state associations can choose any overtime format they want, or even elect to not play overtime at all (ties stand in this case). However, most states use the Kansas Plan. In a majority of states, each team is granted possession of the ball at the 10-yard line, meaning that a team cannot make a first down without scoring except via a defensive penalty that carries an automatic first down (such as defensive pass interference or roughing the passer). As is the case with the college overtime rule, the team that wins the coin toss will have the choice as to whether to take the ball first or second, or decide at which end of the field the overtime will be played. The other major difference between overtime in college football and high school football is that in some states, if the defense forces a turnover, the ball is dead immediately, thus eliminating the possibility of scoring. However, in Texas, the college overtime rule is used, as both the University Interscholastic League, which governs interscholastic activities for Texas public high schools, and the Texas Association of Private and Parochial Schools, the largest analogous body for Texas private high schools, play by NCAA football rules with a few modifications for the high school level.

XFL

The original incarnation of the XFL used a modified Kansas Plan which, upon the first team scoring, required the opponent to score the same or greater number of points in the same or fewer downs (i.e., if the first team scored a touchdown, and converted the one-point conversion in three downs, the opponent would have to match that touchdown and conversion in three downs as well). Each team started at the 20-yard line, but like high school, there were no opportunities for first downs. The league also banned field goals except on a fourth down.

The XFL's current incarnation uses a five-round shootout of two-point conversions similar to a penalty shootout in soccer or ice hockey. Such a shootout had never been attempted in organized football at the time the rule was proposed; in April 2019, the NCAA adopted a similar concept for games that reach quintuple overtime starting with the 2019 FBS season, two seasons later, triple overtime.^[15][16] The defense is not able to score, as should a turnover occur, the play would be dead.^[17] Defensive penalties result in the ball moving up to the 1-yard line, while a second defensive penalty on any play, even in future rounds, results in a score awarded to the offensive team. To speed up the overtime process, both teams' offense and defense are on the field at the appropriate end zone. Once one team's offense has completed its round of the shootout, the other team's offense plays its round from the opposite end zone.^[18] These overtime rules ensure that both teams have an opportunity to win the game and would limit overtime to 5 or 6 minutes. If both teams remain tied after five rounds, multiple rounds of conversions will be played until one team succeeds, thus ensuring that no game can end in a draw.^[17]

USFL (2022)

The United States Football League settles ties this way: teams get three (at least two) rounds of two-point conversions from the three-yard line. Coin toss is called by the visiting team; winner of the toss can choose to possess the ball first or defend. Whoever scores more points in the three rounds wins it; otherwise, teams play sudden-death rounds until one team scores. One timeout can be called per overtime round. Although no game clock is used, the play clock of 35 seconds is still used.

Coin toss

Three minutes before the start of the game, the referee meets with captains from both teams for a coin toss. The visiting team calls the toss before the coin is flipped, since 1998. The winner of the toss may defer their choice to the start of the second half, or they may take the first choice of:

1. Receiving the kickoff to start the game, or kicking off to start the game
2. Choosing an end of the field to defend in the first quarter (with the teams switching directions at the end of the first quarter and at the end of the third quarter)

The loser of the toss gets the remaining option. Typically, if the winner of the toss defers, the loser will choose to receive the ball first.

At the start of the second half, the team that did not choose first (either because they deferred their choice or because they lost the toss) gets the first choice of options.

According to USA Today, in college games, the team that wins the toss defers their choice to the start of the second half over 90% of the time.^[19]

If a game goes to overtime, a coin toss is held before the start of overtime, but tosses are not held before the start of subsequent overtime periods. In college, for example, the loser of the toss to start overtime has the first choice in the second overtime period. The choices available to the captains in overtime vary among the NFL, college, and various states' high school rules.

In high school, the coin toss may be held between the captains or coaches earlier before the start of the game. At three minutes before kickoff, the captains meet for a simulated coin toss, where the referee announces the results of the earlier toss.

Downed player

The rules vary from the college level to the professional level. In the NFL, unless a player is tagged by an opposing player or gives himself up, he is not down. A player carrying the ball (the runner) is downed when any of the following occurs:

• Any part of the runner other than his hands or feet touches the ground. Ankles and wrists count as downed. This may be as a result of:
  • Contact by an opponent (called down by contact) where the opponent tackles the runner by pushing him, grasping him and pulling him to the ground, sliding into his legs, or touching him in any manner prior to any part of the runner other than his hands or feet touching the ground. Unlike the use of the word tackle in other sports, if the opposing player fails to down the ball carrier, it is merely an attempted tackle. If the ball carrier falls onto another player but he doesn't make contact with the ground, he can still get up and keep playing. A player on the ground is not considered part of the ground.
  • Intentionally downing the ball: intentionally kneeling, verbally declaring "I'm Down" (except in college), or similar actions. For example, to protect himself from violent hits by opponents attempting to tackle him, the quarterback may choose to slide to the ground feet-first. This slide is interpreted as intentionally downing the ball, and opponents may then be penalized for hitting him.
  • In amateur football, a runner is downed when any part of his body other than his hands or feet touches the ground at any time (unless he is the holder for a place kick). In professional football, the runner is not down for such accidental contact; he must be down by contact with an opponent as described above.
• The runner goes out of bounds: that is, any part of his body (including his hands or feet) touches the ground, or anything other than another player or an official, on or past a sideline or an endline. The sideline itself is out of bounds so that the runner is deemed out of bounds if he steps on or touches any part of it. A runner may carry the ball in such a manner that it is over the sideline, so long as the ball or runner does not touch anything out of bounds.
• The runner's forward progress toward the opponents' goal line is stopped by contact with an opponent, with little chance to be resumed. The exact moment at which the player's forward progress stops is subject to the judgment of the officials. In particular, for the protection of the quarterback, he is considered down as soon as an official judge that he is in the grasp of an opponent behind the line of scrimmage, and the tackling defensive player(s) will be awarded a sack, if he is driven backward by the opponent, the ball will be spotted where his forward progress was stopped.

Positions

The width of the spotted football defines the width of the neutral zone, an area of the field no player other than the snapper may position himself in or above before the snap. Each team has its own line of scrimmage, thought of as a vertical plane from sideline to sideline that passes through the point of the ball nearest its own goal line.

A formation at the line of scrimmage. Offensive players are marked by O symbols, defensive players by X symbols. This diagram shows two of the most common formations, the offense is in the I formation while the defense is in the 4–3 formation. There are many different formations the players may take.

A typical offense is made up of a quarterback, five offensive linemen, two wide receivers, a running back, a fullback, and a tight end, however teams will vary their personnel on the field to fit any given play. A quarterback is essentially the leader of the offense. It is most often their responsibility to pass along the play called to the rest of the players in the huddle before any given play. A quarterback is the primary ball-handler on offense. It is their responsibility to call the snap count for the ball to enter play. Once the ball is hiked into play, it is their job to either hand the ball off to one of their running backs, or scout the field for an open receiver to throw the ball to. In some instances, the quarterback will run the ball themselves. A quarterback is guarded by their offensive linemen. The offensive line is made up of a left and right tackle, a left and right guard, and a center. It is the center's responsibility to hike the ball to the quarterback. An offensive line has two different jobs. When the offense runs a pass play, it is their job to guard the quarterback from the defense that is rushing. When the offense runs a run play, it is their job to clear a path for the running back to run through. The running back also has multiple roles. They will either take the ball from the quarterback and run, move up and help the offensive line block or go out and catch a pass. While the role of the fullback is deteriorating currently among professional leagues, it is their primary responsibility to lead the running back. Running backs and fullbacks are sometimes also called a halfback, a wingback, or a slotback. Like the running back, the tight end also has multiple roles. They will either help the offensive line protect the quarterback, block on run plays, or run or catch the ball themselves. The wide receivers' primary role is to run out into the field of play and catch the ball, although they will also block in some instances.

The players on offense must arrange themselves in a formation, all behind their line of scrimmage (that is, on their side of the ball). For reasons of safety and competitive balance, there are strict rules which define the way in which the offensive players may line up. Seven players must line up directly on the line of scrimmage while four players line up behind the line of scrimmage. Within this formation, there are six eligible receivers who may receive a forward pass during play. These eligible receivers are either the running back, fullback, tight end, or wide receivers. The remaining five linemen, often called interior linemen do not normally handle the ball during a play. Because of these rules, various leagues of American football have enacted strict rules of uniform numbering so officials may more easily judge which players were eligible and which were not at the start of a play. For example, in college football, ineligible players wear numbers 50–79, while eligible receivers wear 1–49 or 80–99. Even within this structure, offenses can still present a wide number of formations, so long as they maintain the "seven and four" arrangement. Receivers, for example, may play close to the other linemen or they may play some distance down the line of scrimmage, where they would sometimes be called split ends. Of the four backs, they may play behind the linemen or may play "split out" to provide additional wide receivers. These additional receivers can be flankers (if they play split far wide, but still in the backfield) or slot receivers if they play in the "slot" between the split end and the rest of the offensive line.

The players on defense may arrange themselves in any manner, as long as all players are "behind the line" (that is, on the side of the line nearest their own end zone). Players who line up opposite the offensive line are called defensive linemen, usually with one or two defensive tackles in the middle (a single defensive tackle is often called the nose guard or nose tackle) and with one defensive end on each side. A defensive lineman's job is typically to put pressure on the opposing team's quarterback by rushing the offensive line. The defensive line is also most often the first set of players the opponent must get through should they choose to run the ball. Behind the linemen are the linebackers. A linebacker's job can be any number of things, including trying to rush the opposing team's quarterback, stopping the opponents running back on run plays, or covering the opponent's tight end or wide receivers. Positioned opposite the wide receivers are the cornerbacks. Their primary responsibility is to cover the wide receivers. Farthest back from the line are the safeties, usually in the middle of the field behind the linebackers. The safeties are the last line of defense against the opponent. Like a linebacker, a safety's role can vary, however, their most common role is to help the cornerbacks cover the opponent's wide receivers, which is called "double coverage". The linemen and linebackers close to the line of scrimmage, are often referred to as playing "in the box". Players outside "the box" (usually cornerbacks and safeties) are collectively referred to as the "secondary".

Starting the down

A scrimmage down begins with a snap, where the center throws or hands the ball back to one of the backs, usually the quarterback. The quarterback then either hands the ball off to a back, throws the ball, or runs with it himself. The down ends when the ball becomes dead (see below). The ball is typically next spotted where the ball became dead; however, if it became dead outside the hash marks, it is brought in on the same yard line to the nearest hash mark. This spot establishes the lines of scrimmage for the next play. In the case of an incomplete forward pass, the ball is returned to the spot where it was last snapped to begin the next play. A fumbled ball that goes out of bounds is declared dead and possession remains with the team that most recently had control of the ball.

Dead ball

The ball becomes dead, and the down ends, when:

• the ball carrier is downed, as described above;
• under college rules only, the ball carrier fakes a slide to the ground;
• a forward pass falls incomplete (it touches the ground before possession is secured by a player);
• the ball carrier or ball touches the sideline or end line or otherwise goes outside the field of play ("out of bounds");
• the ball carrier or the ball, except on a scoring field goal attempt, hits any part of the goalpost (even if it bounces back onto the field);
• a team scores;
• a kick receiver makes a fair catch (waving his arm above his head to signal a fair catch, where the kicking team is not allowed to interfere with him or hit him after the catch, but in return, he is not allowed to run), or a member of the receiving team gains possession after a fair catch signal was given;
• a member of the kicking team possesses a kicked ball beyond the line of scrimmage (e.g. "downing" a punt allowed to roll by the receiving team by holding it to stop its roll);
• a kicked ball comes to rest;
• a touchback occurs; or
• under NFL or college rules, on fourth down (or, in the NFL, on any down after the two-minute warning in either half/overtime), a ball fumbled forward by the offensive team is recovered by an offensive team player other than the fumbler.

The nearest official typically blows his whistle after the ball becomes dead to alert the players that the down has already ended. If the ball is alive and the official sounds an inadvertent whistle, then the ball still becomes dead, but the team in possession of the ball may elect to have the down replayed or take the spot where the ball was declared dead. If the ball was loose from a fumble, then the ball can be put into play at the spot of the fumble. If the ball was in flight from a kick or a pass, then the down is always replayed.

Kickoffs

A kickoff is a type of free kick where the ball is placed on a tee (or held) at the kicking team's 35-yard line (40 for high school). In the 2011 NFL Season, changes were made regarding kickoffs to limit injuries. The spot from which the ball is kicked was restored to the 35 yard line, bringing to an end the 1994 designation of the 30 yard line, a change meant to increase the frequency of the option to elect a touchback. In addition, players on the kickoff coverage team (apart from the kicker) cannot line up more than a specified distance behind the kickoff line. This distance is 5 yards at most levels of the game and 1 yard in the NFL, minimizing running starts and thus reducing the speed of collisions.^[20][21] The kicking team's players may not cross this line until the ball is kicked; members of the non-kicking (or "receiving") team are similarly restrained behind a line 10 yards further downfield (the 45-yard line, or 50 for high school). A valid kickoff must travel at least this 10-yard distance to the receiving team's restraining line, after which any player of either team may catch or pick up the ball and try to advance it (a member of the kicking team may only recover a kickoff and may not advance it) before being downed (see "Downed player," below). In most cases, the ball is kicked as far as possible (typically 40 to 70 yards), after which a player of the receiving team is usually able to secure possession (since the members of the kicking team cannot start downfield until after the ball is kicked). Occasionally, for tactical reasons, the kicking team may instead choose to attempt an onside kick, in which the kicker tries to kick the ball along the ground just over the required 10-yard distance in such a manner that one of his own teammates can recover the ball for the kicking side. If it is touched before ten yards, the ball is dead and a re-kick or spot of the ball will be rewarded to the receiving team.

Other free kicks

A free-kick is also used to restart the game following a safety. The team that was trapped in its own end zone, therefore conceding two points to the other team, kicks the ball from its own 20-yard line. This can be a place kick (in the NFL, a tee cannot be used), drop-kick, or punt.

In the NFL and high school, a free kick may be taken on the play immediately after a fair catch; see "fair catch kick" below.

Scrimmage plays and kickoffs

Most standard football plays are considered scrimmage plays, initiated from a line of scrimmage. Exceptions are kickoffs and try plays (below). Although similar rules apply during a try play, the number of points awarded for each score differs on a try play.

Try plays

A try play (as opposed to a regular scrimmage play or kickoff), more commonly referred to as an extra-point attempt, PAT (abbreviation of "point after touchdown"), conversion attempt, or two-point conversion attempt, based on the scoring team's intentions on the play, is awarded to the scoring team immediately following a touchdown. This un-timed down is an opportunity to score additional points.^[22]

• Although the game clock is not advanced during a try play, the play clock is enforced. A delay of game penalty, false start, or similar penalty, by the offense results in a 5-yard penalty assessed for the try. Typically, penalties charged against the defense give the offensive two options: half the distance to the goal for the try, or assessing the full penalty on the ensuing kickoff. Since the trial is not timed by the game clock, if a touchdown is scored as regulation time expires (and game clock subsequently reads 0:00.0), the try is still allowed to be conducted. After the Minneapolis Miracle in 2018, the NFL implemented a rule that if a team scores on the final play of the game, and extra points would not change the result, the PAT will no longer be conducted.

Fair catch kick

A free-kick (see above) may be taken on the play immediately after any fair catch of a punt. In the NFL, if the receiving team elects to attempt this and time expired during the punt, the half/overtime is extended with an untimed down. The ball must be held on the ground by a member of the kicking team or drop kicked; a tee may not be used. (High school kickers may use a tee). This is both a field goal attempt and a free-kick; if the ball is kicked between the goalposts, three points are scored for the kicking team. This is the only case where a free kick may score points. This method of scoring is extremely rare, last successfully completed in the NFL by Ray Wersching in 1976. It is only advantageous when a team catches a very short punt with very little time left. A team is unlikely to be punting with only a few seconds left in a half or overtime, and it is rarer still for punts to be caught near field goal range. The officials' signal for a successful fair catch kick is the same as for a field goal.