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Formations

Illegal formation: 5 examples and the rule each breaks

Short answer

An illegal formation is an alignment at the snap that breaks a formation rule: too few on the line, too many backs, too few linemen numbered 50-79, an ineligible player on the end in the NFL, or a kick alignment the book forbids. Here are five, with the rule for each book. Two of them are legal in another book.

Last reviewed:

THE PLAYBOOK CALLERRule Check · 5 examples
  1. 1. I formation, X a yard off the line. Rule Check, NFHS: FLAG.1. I formation, X a yard off the line · NFHS FLAG
  2. 2. I formation, RG replaced by a tight end. Rule Check, NFHS: FLAG.2. I formation, RG replaced by a tight end · NFHS FLAG
  3. 3. Tackle over, LT on the end, uncovered. Rule Check, NFL: FLAG.3. Tackle over, LT on the end, uncovered · NFL FLAG
  4. 4. Punt vs punt safe, a tackle head-up on the snapper. Rule Check, NCAA: FLAG.4. Punt vs punt safe, a tackle head-up on the snapper · NCAA FLAG
  5. 5. Kickoff, L1 7 yards deep. Rule Check, NFHS: FLAG.5. Kickoff, L1 7 yards deep · NFHS FLAG
Five small diagrams, one per example: a five-back set, a line with four interior linemen, a tackle on the end, a defender over the snapper on a punt, and a kickoff cover player seven yards deep.
Verdict by rule book (alignment at the snap)
NFHS (high school)NCAA (college)NFLNCAA + Texas UIL
1. Six on the line, five backsNFHS 7-2-5a · NCAA 7-1-4-a-4 · NFL 7-5-1(a)FLAGFLAGFLAGFLAG
2. Only four linemen numbered 50-79 on the lineNFHS 7-2-5b · NCAA 7-1-4-a-3FLAGFLAGNOT CHECKEDFLAG
3. Unreported tackle on the end of the lineNFL 7-5-1(b), (e), 5-3-1LEGALLEGALFLAGLEGAL
4. Defender head-up on the snapper against a puntNCAA 6-3-14-a · NFL 9-1-3LEGALFLAGFLAGFLAG
5. Kickoff cover player 7 yards deepNFHS 6-1-3b · NCAA 6-1-2-bFLAGFLAGN/AFLAG

1. Six on the line, five backs

The split end steps back to be a flanker and nobody replaces him on the line. Flag in every book: NFHS 7-2-5a and NCAA 7-1-4-a-4 allow four backs; NFL 7-5-1(a) needs seven on the line.

2. Four linemen numbered 50-79

A tight end replaces a guard. Seven are on the line, but only four wear 50-79. Flag in high school (7-2-5b) and college (7-1-4-a-3). The Playbook Caller does not apply this count under the NFL book. See the numbering rule.

3. An unreported tackle on the end (NFL)

The tackle is the end man with no tight end outside him. Flag in the NFL unless he reported as eligible (7-5-1(b), (e), 5-3-1). Legal in high school and college, where he is simply ineligible. See tackle over.

4. A defender head-up on the snapper on a punt

Flag in college (6-3-14-a) and the NFL (9-1-3): within a yard of the line, the defender must be clear of the snapper. Legal in high school. See defenders over the snapper.

5. A cover player 7 yards deep on a kickoff

Flag in high school (6-1-3b) and college (6-1-2-b): only the kicker may be more than five yards behind the kicking team’s line. See high school kickoffs.

What The Playbook Caller checks

Each example above is the verdict the app returns for that alignment under each book, with the rule number. It checks alignment at the snap only.

The Playbook Caller checks alignment at the snap only. Motion, shifts, timing, contact and penalties are not judged.

3 things coaches get wrong

  1. Calling any unusual set "illegal". Tackle over, swinging gate and empty are legal when the counts hold.
  2. Assuming a flag in one book is a flag in all. Examples 3 and 4 depend on the book.
  3. Fixing the count and breaking the numbers. Check both.
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Questions coaches ask

What is the penalty for illegal formation?

In college, a live-ball foul, 5 yards from the previous spot (7-1-4). In the NFL, loss of five yards (7-5-1). Check your state or league for high-school enforcement.

Is illegal motion the same thing?

No. Motion and shifts are about movement before the snap. This page, and the app, cover alignment at the snap.

Can I check my own formation?

Yes. Draw it in The Playbook Caller, pick your rule book, and the rule check reports each issue with its rule number.

Sources

We paraphrase and cite; we never reproduce rule-book text. These are the public sources the verdicts rest on.

Coaching aid, not an official ruling: the game officials' ruling governs. The Playbook Caller is not affiliated with or endorsed by the NFL, NCAA, NFHS or UIL, nor by Pop Warner, AYF or USA Football.

Related rules

Check the formations you actually run

Drag a player and The Playbook Caller re-checks the formation under your rule book. If it breaks a rule, it tells you what is wrong and shows the rule behind it.

Check your own formation: 14 days free Or keep the rules on paper: the free one-page card.