A single plaintiff may join in the same petition as many causes of action, legal or equitable, independent or alternative, as there are against a single defendant.
Rule 1.231.Actions joined
Division II: Actions, Joinder of Actions and Parties · Last amended February 15, 2002 · Last verified July 15, 2026
In one sentenceRule 1.231 lets a single plaintiff join as many legal or equitable, independent or alternative causes of action as they have against a single defendant, all in one petition.
Full Text of Rule 1.231
Plain-English Summary
Rule 1.231 removes any need to file separate lawsuits when one plaintiff has multiple claims against one defendant. It allows a single plaintiff to join in the same petition as many causes of action as they have against that single defendant, regardless of whether those claims sound in law or in equity, and regardless of whether they are independent of each other or stated as alternatives.
This reflects Iowa's merged approach to law and equity in pleading: the rule does not require a plaintiff to sort claims into separate proceedings based on their historical legal or equitable character. A plaintiff with a contract claim, a tort claim, and an equitable claim against the same defendant, all arising from unrelated events, can bring them together in one petition rather than filing three separate cases.
Because Rule 1.231 is limited to a single plaintiff and a single defendant, it operates alongside — but distinctly from — the rules governing when multiple plaintiffs or multiple defendants can be joined in one action based on a shared transaction or occurrence.
Frequently Asked Questions
Can I bring more than one unrelated claim against the same defendant in a single lawsuit?
Yes. Rule 1.231 allows a single plaintiff to join as many causes of action as they have against a single defendant, whether or not those claims are related to each other.
Does it matter whether my claims are legal or equitable in nature?
No. Rule 1.231 allows joinder of causes of action that are legal, equitable, independent, or alternative, without requiring them to share a legal character.
Can I plead alternative claims against the same defendant in one petition?
Yes. Rule 1.231 expressly allows alternative causes of action to be joined together with independent ones.
Does Rule 1.231 require my multiple claims to arise from the same transaction or occurrence?
No. Unlike the rules governing joinder of multiple plaintiffs or defendants, Rule 1.231 does not condition a single plaintiff's joinder of claims against a single defendant on a shared transaction, occurrence, or common question.
Does this rule apply when there is more than one defendant?
No. Rule 1.231 is limited to actions with a single plaintiff and a single defendant; joinder involving multiple plaintiffs or multiple defendants is governed by separate rules.
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 joining multiple claims same defendantcombine legal and equitable claims iowa lawsuitjoining causes of action one petition iowasingle plaintiff multiple causes of action iowa