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Common-Law Compulsory Counterclaim Rule: Creating Effective And Elegant Res Judicata Doctrine, Kevin M. Clermont

Cornell Law Faculty Publications

Even in the absence of an applicable statute or court rule, failure to assert an available counterclaim precludes bringing a subsequent action thereon if granting relief would nullify the judgment in the initial action. This so-called common-law compulsory counterclaim rule emerges from the intuitive principle of claim preclusion that a valid and final judgment generally precludes the defendant from later asserting mere defenses to the claim. The implicit extension of this idea is that once a plaintiff obtains a judgment, the defendant generally cannot bring a new action to undo the judgment by reopening the plaintiff’s claim and pushing those …