N.C. Gen. Stat. § 7A-219
No counterclaim, cross claim or third-party claim which would make the amount in controversy exceed the jurisdictional amount established by G.S. 7A-210(1) is permissible in a small claim action assigned to a magistrate. No determination of fact or law in an assigned small claim action estops a party thereto in any subsequent action which, except for this section, might have been asserted under the Code of Civil Procedure as a counterclaim in the small claim action. Notwithstanding G.S. 1A-1, Rule 13, failure by a defendant to file a counterclaim in a small claims action assigned to a magistrate, or failure by a defendant to appeal a judgment in a small claims action to district court, shall not bar such claims in a separate action.
N.C. Gen. Stat. § 7A-219