When a verdict is found for the plaintiff in an action for the recovery of money or for the defendant when a counterclaim for the recovery of money is established exceeding the amount of the plaintiff's claim as established, the jury must also find the amount of the recovery.
Content Of Verdict -- Action Or Counterclaim For Recovery Of Money
Mont. Code Ann. § 25-7-502, under Jury's Verdict.
Mont. Code Ann. § 25-7-502