Tagging up is an appeal rule, not a force play.

The rule and version used here

This page applies the Office of the Commissioner of Baseball's 2026 Official Baseball Rules (OBR), in force for Major League Baseball's 2026 season. The controlling provisions are Rules 5.06(b)(1)–(2), 5.08(a), 5.09(b)(4)–(6), 5.09(c)–(d), and the definitions of “Catch,” “Force Play” and “Tag.”

The 2026 edition amended Rule 5.06(b)(1) and added Appendix 6 to clarify when a runner has passed a base and must retouch it. NCAA, school, youth, international and tournament games may appoint another code; this page does not treat the MLB procedure as universal.

Ask why the runner must move

The OBR definition makes the trigger narrow: a force play exists when a runner loses the right to occupy a base because the batter became a runner. With a runner on first and a fair ground ball, the batter-runner needs first, so the existing runner must advance to second. With the bases loaded, that dependency continues through second, third and home.

Running because a coach sent the runner, trying to gain an extra base, or returning after a catch does not by itself create a force. The movement may look compulsory, but the legal reason for it determines the out and the scoring treatment.

Possession plus the correct base is enough

Rule 5.09(b)(6) retires a forced runner when, before the runner reaches the next base, a fielder tags either the runner or that next base. Under the 2026 definition of “Tag,” the fielder must securely and firmly hold the ball while touching the base with the body; merely arriving near the bag or losing the ball as part of the tag does not complete the out.

A base touch works only while that runner is still forced to that base. If the runner passes the forced-to base without touching it, the force has not been removed and the defence can appeal at that base. If the force has already disappeared, Rule 5.09(b)(4) normally requires a tag of the runner while the ball is live and the runner is off a base.

The force can end during the same play

Rule 5.09(b)(6) identifies three sequence changes:

• A following runner is forced out: the force on a runner ahead is removed. The lead runner must then be tagged.
• The forced runner touches the forced-to base: that force ends. If the runner overslides or overruns, the defence must tag the runner off the base.
• The runner retreats toward the previous base: the rule reinstates the force, allowing the defence to retire that runner by tagging the forced-to base again.

The batter-runner being put out at first also removes the reason the runners ahead had to vacate their bases. Umpires therefore classify each out at the instant it happens, rather than calling the whole batted-ball sequence “a force play.”

A catch removes the batter, not the runner's old base

On a legally caught fair or foul fly ball, Rule 5.09(a)(1) retires the batter. Because the batter is no longer advancing behind the existing runners, there is no force created by that batted ball. The runners may advance, but Rule 5.09(b)(5) requires each one to retouch the base occupied at the time of the pitch before doing so legally.

The runner need not wait for the catch signal

The 2026 OBR definition of “Catch” permits runners to leave their bases the instant the first fielder touches the ball. The fielder may still bobble it before completing secure possession. If the catch is ultimately completed, a runner who left at or after that first touch has complied with the departure timing; waiting until the catch is fully proved is not required.

If the ball is not legally caught, there is no caught-fly retouch violation. The ordinary live-ball rules govern. A caught foul fly uses the same retouch requirement; a caught foul tip does not, because Rule 5.09(b)(5) expressly allows runners to steal on a foul tip.

Return to the base before starting forward

Rule 5.09(c)(1) says “retouch” means tagging up and starting from contact with the base after the catch. A runner cannot stand behind the base, begin moving early and touch it at speed to obtain a flying start. That is appealable even though the runner contacted the bag.

If a runner passed another base while the ball was in flight and must return, Rule 5.06(b)(1) requires the runner to retouch passed bases in reverse order. Under the 2026 clarification, a base is passed when both feet are on the ground beyond the relevant edge in the direction of travel; a runner who passed it while returning must retouch it before advancing again.

The umpire does not supply the out

Leaving too early is an appeal play under Rules 5.09(b)(5) and 5.09(c)(1). With the ball in play, a fielder must securely hold it, tag the runner or the original base, and make the appeal unmistakable through words or conduct. Accidentally stepping on the base with the ball is not an appeal, and “Time” is not out while an appeal is being made.

The defence must act before the next pitch or any play or attempted play. On a play ending the half-inning, it must appeal before the pitcher and all infielders leave fair territory on the way off the field. A replay request is a different procedure; it does not substitute for the on-field rules appeal.

Classify the third out before counting the run

Rule 5.08(a) begins with timing: a runner must legally touch home before three outs. It then bars a run scored during a play when the third out is:

1. the batter-runner out before touching first;
2. any runner being forced out; or
3. a preceding runner declared out for failing to touch a base.

A retouch appeal after a caught fly is not automatically one of those force outs. If a properly tagged-up runner touches home before another runner is put out on a retouch appeal for the third out, the run can count. If the runner who crossed home is successfully appealed for leaving early, that runner never has a legal run; if a preceding runner's retouch failure becomes the third out, Rule 5.09(d) prevents following runners from scoring.

An apparent fourth out can change the score

Rule 5.09(c) allows the defence to complete a timely appeal even when three outs appeared to have ended the play. If the sustained appeal on another runner gives the defence a more favorable inning-ending out, that appeal takes precedence for deciding the score. Where more than one appeal is available, the defence may elect the out that gives it the advantage.

This does not add a literal fourth out to the inning. It selects which legal out controls the run-scoring analysis. The defence still must appeal before leaving the field under the rule's definition.

MLB can review the factual call

MLB's current Replay Review guidance lists force/tag plays, whether a runner touched a base, whether a run beat a third out, and tag-ups as reviewable categories. Replay can therefore test whether a fielder held the ball, touched the base or runner, or whether a runner left early.

Replay review remains separate from the Rule 5.09(c) appeal. The defence first preserves and makes the required on-field appeal; MLB's manager-challenge or crew-chief procedure can then review an eligible ruling. Replay does not convert an expired or omitted appeal into an out.

An infield fly also removes the force

When an Infield Fly is declared and the ball is fair, Rule 5.09(a)(5) makes the batter out immediately. The runners are no longer forced, even if the ball falls untouched. A fielder who then possesses the ball and touches the next base cannot retire a runner merely by treating it as the original force; the runner must be tagged unless another rule supplies an out.

If the infield fly is caught, runners still must retouch before advancing, just as on another caught fly. If it is not caught, there is no caught-fly retouch duty, although runners advance at their own risk and the ball remains live.

Third base before second base

Situation: with runners on first and second and one out, the batter grounds to short. The shortstop touches third before throwing to second.

MLB 2026 ruling: the touch of third retires the runner from second while that runner is still forced. The later touch of second can retire the runner from first for a force double play. The decisive fact is order: neither following runner had yet been retired when the lead force was completed.

Second base before third base

Situation: use the same runners and ground ball, but the defence first forces the runner from first at second and then merely touches third before the lead runner arrives.

MLB 2026 ruling: the touch of third alone is not an out. Retiring the following runner at second removed the force on the runner who started at second, so the defence must tag that lead runner. The same bases are involved, but the reversed order changes the ruling.

A run scores before a retouch appeal

Situation: with one out and runners on first and third, a fly is caught. The runner from third tags legally and touches home. The runner from first had left early, and the throw reaches first for the third out after the run crosses.

MLB 2026 ruling: the run counts. The out at first is a retouch appeal, not a force out, and the legal run preceded the third out. This is the result stated in the OBR's Force Play Comment and Rule 5.08 Comment.

The forced runner overslides

Situation: a runner forced from first beats the throw to second but slides beyond the bag. The fielder controls the ball and touches second without tagging the runner.

MLB 2026 ruling: the base touch does not retire the runner. The force ended when the runner touched second, so Rule 5.09(b)(6) requires a tag while the runner is off the base. If the batter-runner still requires first and the runner retreats toward first, the force is reinstated; a later touch of second can then retire the runner.

The outfielder juggles the catch

Situation: the runner on third leaves when the outfielder first gloves the fly ball. The ball is juggled twice but is secured before touching the ground, and the runner scores.

MLB 2026 ruling: the departure was legal. The OBR permits leaving at first touch, even though the catch is completed later. An appeal that proves only that the runner left before final control should be denied; the decisive moment is first touch.

How to analyse the play

1. Name the code and edition. This page uses MLB's 2026 OBR.
2. Identify why the runner moved. Did the batter becoming a runner displace that runner, or was the runner advancing voluntarily or retouching?
3. Freeze each out in sequence. Check whether a following out or the runner's touch of the destination removed the force first.
4. On a fly, decide catch and first touch. If caught, trace every runner back to the time-of-pitch base; if dropped, do not invent a retouch violation.
5. Check the out method. Secure possession plus the forced-to base, a tag of the runner, or a timely retouch appeal.
6. For a third out, classify it. Force, batter-runner before first, preceding-runner miss, or ordinary time play.
7. Then consider replay. Review may correct an eligible factual ruling, but it is not the underlying baserunning appeal.

Five claims to avoid

• “Returning after a catch is a force play.” It is a retouch obligation enforced by appeal.
• “A force lasts until the play is over.” It can be removed or reinstated during the sequence.
• “The runner must wait until the fielder shows control.” Departure is legal from the first fielder's touch if the catch is ultimately completed.
• “Every third out at a base cancels the run.” The legal type and timing of the out decide the score.
• “The umpire calls an early departure automatically.” MLB requires a proper and timely appeal.

Governing-body sources and effective version

• Office of the Commissioner of Baseball — Official Baseball Rules, 2026 Edition: Rules 5.06(b)(1)–(2), 5.08, 5.09(a)(1), 5.09(a)(5), 5.09(b)(4)–(6), 5.09(c)–(d), Definitions of Terms and Appendix 6
• Major League Baseball — current Appeal Plays rules glossary: retouch violations, appeal deadline and unmistakable intent
• Major League Baseball — current Replay Review guidance: force/tag plays, base touches, time plays and tag-ups

Checked on 26 August 2026 against the Office of the Commissioner's 2026 OBR and MLB's current appeal and replay pages. The 2026 edition's retouch clarification in Rule 5.06(b)(1) and Appendix 6 is included. MLB is the controlling scope here; competition regulations and other professional, college, school, youth or international codes may supplement or replace this baseline.