Rule 15: Amended and Supplemental Pleadings
What is Amended and Supplemental Pleadings?
Rule 15 governs when and how you can change your pleadings. It is designed to be liberal, favoring amendments so cases can be decided on the merits rather than on pleading technicalities.
Source: Fed. R. Civ. P. 15
Plain English Explanation
Rule 15 governs when and how you can change your pleadings. It is designed to be liberal, favoring amendments so cases can be decided on the merits rather than on pleading technicalities.
You get one free amendment as a matter of course — meaning you do not need anyone's permission. This right exists for 21 days after you serve the pleading, or 21 days after the other side serves a responsive pleading or a Rule 12(b), (e), or (f) motion, whichever is earlier. After that window closes, you need either the other party's consent or leave of court.
The most heavily tested aspect of Rule 15 is relation back under 15(c). If your amendment adds a new claim arising from the same transaction or occurrence as the original complaint, the amendment 'relates back' to the date of the original filing for statute of limitations purposes. If you are adding a new party, relation back requires that the new party received notice within the service period and knew or should have known the action would have been brought against them but for a mistake in identity.
Key Points
- 1One amendment as of right within 21 days of serving or within 21 days of a responsive pleading/12(b)(e)(f) motion
- 2After the right expires, amendment requires consent or leave of court (freely given when justice requires)
- 3Relation back under 15(c)(1)(B): new claims from the same T/O relate back to the original filing date
- 4Adding new parties requires notice within the service period and a mistake-in-identity element under 15(c)(1)(C)
- 5Rule 15(b) allows amendments to conform to evidence at trial
Common Exam Issues
- Whether an amendment relates back to the original filing date under 15(c)
- Adding a new party: the mistake-in-identity requirement of 15(c)(1)(C)
- The Foman v. Davis factors for when leave to amend should be denied (futility, undue delay, bad faith, prejudice)
- Timing of the right to amend as a matter of course
Important Cases
Foman v. Davis, 371 U.S. 178 (1962)
Krupski v. Costa Crociere S.p.A., 560 U.S. 538 (2010)
Worthington v. Wilson, 8 F.3d 1253 (7th Cir. 1993)
Beeck v. Aquaslide 'N' Dive Corp., 562 F.2d 537 (8th Cir. 1977)
Related Rules
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