The Balk Rule Explained: Every Way a Pitcher Can Balk

By 4Baseball Staff · November 5, 2026 · 12 min read

A plain-language guide to the balk: why the rule exists, the thirteen situations in the rulebook grouped by type with examples, what happens to runners, and how the 2023 disengagement limit changed it.

A balk is an illegal act by a pitcher while there are runners on base, and its penalty is simple: every runner moves up one base. Everything difficult about the balk is in the first half of that sentence, because the official rules list thirteen numbered ways a pitcher can balk, and several of them look nearly identical to legal moves from the stands. A pitcher who steps off the rubber and fakes a throw to first is fine; one who makes the same fake while still touching the rubber has balked.

The rule exists for one reason: to stop pitchers from tricking runners. A runner takes a lead, and the pitcher's job is to pitch or to throw to a base. If a pitcher could fake a pitch, then throw to first, or fake a throw, then deliver home, every runner would be caught between bases by deception. The balk rule forces the pitcher to commit, and it gives the runner a reliable signal: once the pitcher starts a motion, he must finish it. This guide groups the thirteen balk situations by type, gives a plain example of each, and explains how the penalty works.

A note on sources: the exact wording of the balk rule is in the Official Baseball Rules, which are updated periodically, and leagues below the majors (high school, college, youth) use their own books with small differences. Treat this article as a guide to the major-league rule as of the 2025 season, and check the book your league uses.

Why the rule exists

Imagine baseball without a balk rule. A right-handed pitcher stands on the rubber with a runner on first. He lifts his leg as if to pitch, then wheels and throws to first. The runner, who started toward second when the leg went up, is easily out. A pitcher could do this every time. Or he could fake a throw to first and pitch, catching the runner leaning. The runner would never be able to take a lead safely, and base stealing, the hit-and-run and most of the running game would disappear.

The balk rule fixes the contract between pitcher and runner. The pitcher has two legal options when he is on the rubber with runners on: pitch to the batter, or step off the rubber and throw. What he may not do is start toward one and finish the other. Because the rule protects the runner's ability to take a lead, it protects the offense's ability to steal, and that is part of why the rule has been revised, argued over and sometimes strictly enforced throughout baseball history.

The rule is also a matter of interpretation. The umpire must decide, in a fraction of a second, whether a motion was a "motion naturally associated with the pitch." That judgment is the origin of most arguments about balks.

The basic ideas

Before the list, four ideas make the individual rules easier to follow.

1. The rubber is the dividing line. A pitcher who is touching the pitcher's plate (the rubber) is bound by the balk rules. A pitcher who has stepped off the rubber with his pivot foot is treated like an infielder and can fake or throw as he likes.
2. There are two pitching positions. In the windup, the pitcher faces the batter with his pivot foot on the rubber and starts his motion when he chooses. In the set position (often called the stretch), used with runners on base, the pitcher must hold the ball in front of his body with both hands, then come to a complete stop before he pitches.
3. A runner on base is required. With the bases empty, nobody can be fooled, so a balk cannot be called. The one act that still has a penalty is an illegal pitch, which with the bases empty is simply called a ball.
4. Intent does not matter. A pitcher who drops the ball by accident has balked just as surely as one who did it on purpose.

Group 1: starting a pitch and not finishing it

Two balks cover the pitcher who begins something and stops.

Starting the delivery and not completing it. If the pitcher, touching the rubber, makes any motion naturally associated with his pitch and then does not deliver the pitch, it is a balk. Example: a pitcher in the set position lifts his front knee, then holds the ball and steps back, or stops because the runner is going. The knee lift began the pitch, so the pitch had to finish.

Feinting a throw to first or third and not throwing. A pitcher on the rubber who makes a fake throw to first base or third base without actually throwing has balked. Example: the pitcher turns his shoulders toward first, starts his arm forward, then holds the ball and looks home. A fake toward second base is different, and it is allowed: the pitcher may feint to second without balking. Many pitchers use that feint to keep a runner on second honest.

The distinction between a legal and an illegal feint is what the rest of the rule is built on. A pitcher can stand on the rubber and look toward a base without balking. The words "naturally associated" are doing a lot of work, because the umpire must decide whether a given movement was the start of a pitch.

Group 2: throwing to a base the wrong way

Two more balks concern pickoff throws.

Not stepping toward the base. Before he throws to a base, a pitcher on the rubber must step directly toward that base with his free foot. A pitcher who throws to first while his foot points toward home, or toward second, has balked. This is the rule that tests left-handed pitchers most, because a left-hander faces first base while he is set, and his motion to first and his motion to the plate can look the same. A left-hander can legally lift his leg and then throw to first as long as the leg movement is a step toward first; if his leg swings toward home and he throws to first anyway, it is a balk.

The "step directly toward" requirement is also where umpires disagree. A step that is a few degrees off the line is not penalized in every game. Pitchers known for strong pickoff moves, such as the left-hander Andy Pettitte, were sometimes accused by critics of crossing the line, and umpires had to decide on the spot. The historical record shows balks for each pitcher, and the career leader is Steve Carlton, a left-hander, with 90.

Throwing to an unoccupied base. A pitcher on the rubber who throws or fakes a throw to a base with nobody on it has balked, unless the throw is part of a legitimate play. Example: with a runner on first only, the pitcher turns and throws to third base to try to fool the runner. That is a balk. An exception is a real play, for example when a runner is advancing and the pitcher throws to the base he is headed for.

Group 3: pitching illegally

Three balks involve the act of pitching itself.

Not facing the batter. The pitcher may not deliver the ball while turned away from the batter. It sounds obvious, and a pitcher would rarely do it, but a trick delivery such as a quick throw from a turned position falls here.

The quick pitch. A pitcher may not pitch before the batter is in the box and ready, or in a way designed to catch the hitter off balance. The quick pitch is penalized as an illegal pitch, and with runners on it is a balk.

Pitching to an intentional walk with the catcher out of position. When a pitcher is issuing an intentional walk, the catcher must remain in the catcher's box until the ball leaves the pitcher's hand. A pitcher who delivers while the catcher is outside is called for a balk. Since the introduction of the automatic intentional walk in 2017, in which the manager signals instead of the pitcher throwing four balls, this situation almost never arises in the major leagues, though it remains in the rulebook.

Group 4: ball, hands and rubber

The remaining balks concern what the pitcher does with the ball, his hands and his position on the rubber.

Pitching motion off the rubber. A pitcher who is not touching the plate and makes a motion naturally associated with his pitch has balked. Example: stepping off the rubber and then going through a pitching motion anyway. The reverse is perfectly legal: a pitcher who has stepped off properly can throw to a base like an infielder.

Standing on the rubber without the ball. A pitcher who stands on or astride the plate without the ball has balked, as has one who, while off the plate and without the ball, feints a pitch. Both are treated as attempts to deceive the runner.

Taking a hand off the ball. After coming to a legal pitching position, the pitcher may not take one hand off the ball except to pitch or to throw to a base. Example: in the set position, the pitcher lets go of the ball with one hand to wipe his face or adjust, then puts the hands together again. Once in the stretch, he is committed.

Dropping the ball. While touching the plate, a pitcher who drops the ball, accidentally or intentionally, has balked. This is the rule most likely to look unfair to the pitcher, because the drop may be a slip, but the runners on base have no way to know it, and the rule treats it the same.

Unnecessarily delaying the game. A pitcher who stalls with runners on can be called for a balk. Since 2023 much of the enforcement of delay has moved to the pitch timer, which charges an automatic ball or strike, but the balk language remains in the book.

Failing to come to a complete stop. In the set position, the pitcher must come to a complete, discernible stop before starting his delivery. This is among the most frequently called balks, and it is the most common cause of disagreement because a stop is easy to see on video but hard to judge live. A pitcher who flows from the set position into his motion without a pause has balked, whatever the speed of the pitch.

This grouping is a teaching device, and the numbering in the rule book follows a different order. What matters for a fan is the pattern: starting something and not finishing it, throwing to a base the wrong way, pitching in an illegal manner, or mishandling the ball and the rubber.

What happens when a balk is called

The penalty depends on what happened on the play.

• Runners on base. The ball is dead and each runner advances one base. A runner on first goes to second. A runner on third scores. The batter stays at the plate, and the count does not change.
• Bases empty. A balk is not possible. If the illegal act is a pitch, the umpire calls an illegal pitch and awards a ball.
• The pitch is made anyway. If the pitcher goes ahead and delivers, and the batter and all the runners advance at least one base on the play, for example on a hit or a walk, the balk is ignored. The offense takes the result of the play. If anything else happens, the balk is enforced: the runners take their awarded bases and the batter returns to the plate.
• Bases loaded. A balk forces in a run, one of the few ways a pitcher can concede a run without throwing a pitch.

The rule about ignoring the balk on a successful play is easy to forget and deserves a worked example. A runner is on first, and the pitcher balks while delivering. The batter singles and the runner goes to third. The offense is better off than with the balk, so the balk is ignored. Suppose instead the batter grounds into an out. The balk is enforced: the out is erased, the runner moves to second and the batter steps back in with the same count.

Balks in the numbers

The historical record shows the number of balks charged to each pitcher, and the totals show how the enforcement of the rule has changed. For the American and National Leagues combined, the database shows 55 balks in 1960, 128 in 1970 and 257 in 1980. In 1987 there were 356, and in 1988 there were 924, an enormous jump in a single season. The jump is widely attributed to a decision to enforce the rule on the complete stop in the set position far more strictly than before. The next season the number fell to 407, and by 1990 it was back to 288.

The single-season individual leader in the database is Dave Stewart, who was charged with 16 balks in 1988. The next highest are John Dopson with 15 in 1989 and Bob Welch with 13 in 1988. Most of the highest individual seasons in the database are from 1988, which tells its own story about what an enforcement campaign can do to a statistic.

Another note from the database: Bob Shaw, then pitching for the Milwaukee Braves, is charged with 8 balks in 1963. Accounts of that season say he balked five times in a single game, a figure often cited as the single-game record; the historical record does not record individual games, so treat that as a report rather than a verified figure.

The 2023 change: limits on pickoff attempts

The most important recent change to the balk rule came with the 2023 pitch-timer rules. To keep pitchers from using endless pickoff throws to slow the game, the major leagues limited each pitcher to two "disengagements" per plate appearance. A disengagement is a step-off or a pickoff attempt. After a pitcher has used two, he may attempt a third pickoff only if it succeeds in retiring the runner; if the runner is safe, the pitcher is charged with a balk and the runners advance. A runner who goes to a new base resets the count.

The effect shows up in the totals. The league had 122 balks in 2022 and 208 in 2023, a rise of more than 70 percent in one season, with 197 in 2024 and 181 in 2025. Much of the increase is attributed to the new disengagement rule. For a broader look at the other timing rules introduced in 2023, see the article on the pitch-clock era.

The effect on strategy was clear. With only two throws to hold a runner, base stealers had more room, and pitchers had to find other ways of controlling the running game: quicker deliveries, better holding of the runner, and a more varied rhythm. Rules at the college, high school and youth levels differ, so check the book for your league.

Telling a legal move from a balk

For a fan, a few questions settle most cases.

1. Is there a runner on base? If not, there cannot be a balk.
2. Is the pitcher's pivot foot on the rubber? If he has stepped off, he is free to fake or throw.
3. Did he start a motion that he did not finish? If so, it is probably a balk.
4. If he threw to a base, did he step toward it first, and was there a runner on it?
5. If he is in the set position, did he stop?

Nothing in these questions requires you to know the numbering of the rule. They are enough to follow almost every call.

Common questions

Can a pitcher fake a throw to first and then throw home? Not while touching the rubber. A fake to first base is a balk unless the throw is completed. If he steps off first, he is no longer bound by the rule.

Does a balk count as a pitch? No. When the balk is called before a pitch, the ball is dead, the count stays the same and no pitch is added.

Can the batter hit a balked pitch? If the pitch is delivered anyway and the batter swings, the play goes on. If the batter and all the runners advance at least one base, the balk is ignored; otherwise the runners take their awarded bases.

Who has been charged with the most balks? In the historical record Steve Carlton leads with 90 career balks, followed by Bob Welch (45), Buddy Black (43) and Charlie Hough and Phil Niekro (42 each).

Does a balk go in the box score? Yes. Balks are recorded as BK in the pitching statistics, and you can mark them on a scoresheet with the same abbreviation.

Is a balk the same as an illegal pitch? Not exactly. An illegal pitch with the bases empty is a ball. With runners on base, the same act is a balk.

Where to go next

If you enjoy the technical side of the rulebook, read the infield fly rule explained, the dropped third strike rule and the rules of fair and foul balls. To follow how often pitchers are called for balks in a given season, check the leaders page, and for more on rules in general browse the rules and umpiring topic page.