Australian Capital Territory Current Regulations Australian Capital Territory Current Regulations(1) A third party who has a claim against the defendant who included the third party may counterclaim against the defendant.
(2) The third party may include the plaintiff or someone else as a defendant to the counterclaim if the person could be included as a defendant if the third party brought a separate proceeding.
(3) Rule 462 (Counterclaim—against additional party) applies, with necessary changes, to a counterclaim by a third party.