Plain-English summary
Does Rule 8(c)(1) bar an unpleaded affirmative defense at summary judgment?
This case asks whether a defendant who failed to plead an affirmative defense in its answer can still use that defense later as the basis for a summary-judgment motion. The Court granted review to resolve how strictly Rule 8(c)(1) — which says a party "must" plead "any" affirmative defense — is enforced at the summary-judgment stage.
Why this matters
The Court's answer will affect when and how defendants must raise defenses, and when plaintiffs can rely on an opponent's failure to plead to block later defenses. The decision will shape civil case strategy, influence case management, and affect the timing and scope of summary-judgment practice in federal courts nationwide.
Who may feel it
- Civil litigants in federal court (plaintiffs and defendants)
- Civil defense and plaintiff attorneys
- Federal judges and magistrate judges
- Court administrators and litigation managers
Key questions
- Does Rule 8(c)(1)'s mandatory language mean an affirmative defense not pleaded in the answer cannot be used later at summary judgment?
- If a defense is omitted from the answer, can a court nonetheless consider it at summary judgment under other rules (for example, by treating it as an amendment to the answer or finding no prejudice to the opposing party)?