By leave of court, upon reasonable notice and upon such terms as are just, or by written consent of the adverse party, a party may serve and file a supplemental pleading setting forth transactions or occurrences or events which have happened since the date of the pleading sought to be supplemented. Leave may be granted even though the original pleading is defective in its statement of a claim for relief or defense. No responsive pleading to the supplemental pleading is required unless the court, upon its own motion or the motion of a party, so orders, specifying the time therefor.
Rule 1.414.Supplemental pleadings
Division IV: Pleadings and Motions · Last amended February 15, 2002 · Last verified July 15, 2026
In one sentenceRule 1.414 lets a party, with the court's permission or the other side's written consent, add a supplemental pleading describing events that happened after the original pleading was filed, even if that original pleading had its own defects.
Full Text of Rule 1.414
Plain-English Summary
An amendment under Rule 1.402 reworks a pleading based on facts that already existed when the original was filed. A supplemental pleading does something different: Rule 1.414 lets a party, by leave of court on reasonable notice and just terms, or by the adverse party's written consent, add a pleading covering transactions, occurrences, or events that happened after the date of the pleading being supplemented. The court can grant that leave even if the original pleading itself was defective in how it stated a claim or defense — a supplemental pleading is not blocked just because the pleading it builds on had problems of its own.
Unlike an ordinary pleading, a supplemental pleading does not automatically call for a response. No responsive pleading is required unless the court, on its own motion or a party's, orders one and sets the time for it.
Frequently Asked Questions
What's the difference between an amended pleading and a supplemental pleading?
An amendment under Rule 1.402 reworks the pleading based on facts that existed when it was originally filed. A supplemental pleading under Rule 1.414 instead adds transactions, occurrences, or events that happened after the original pleading's date.
Do I need the court's permission to file a supplemental pleading?
Yes, unless the adverse party consents in writing. Otherwise, Rule 1.414 requires leave of court, granted upon reasonable notice and on just terms.
Can I file a supplemental pleading if my original pleading had problems?
Yes. Rule 1.414 allows leave to be granted even though the original pleading is defective in its statement of a claim or defense.
Does the other side have to answer my supplemental pleading?
Not automatically. No responsive pleading is required unless the court orders one, on its own motion or a party's, and sets the time for filing it.
What kind of events belong in a supplemental pleading rather than an amendment?
Events that happened after the date of the pleading being supplemented, as opposed to facts that already existed and could have been included in the original pleading.
Source & verification. Rule text and the Comment are
reproduced verbatim from the Iowa Rules of Civil Procedure, adopted by the
Iowa Supreme Court. Last verified July 15, 2026.
· Official source
Also known as: iowa supplemental pleading ruleleave of court supplemental pleading iowaevents after original pleading iowasupplemental vs amended pleading iowaiowa rule 1.414 new events