diff --git a/Xero.Api/Core/Model/Organisation.cs b/Xero.Api/Core/Model/Organisation.cs
index b2717288..809dcc59 100644
--- a/Xero.Api/Core/Model/Organisation.cs
+++ b/Xero.Api/Core/Model/Organisation.cs
@@ -54,6 +54,9 @@ public class Organisation
         [DataMember(EmitDefaultValue = false)]
         public int? FinancialYearEndMonth { get; set; }
 
+        [DataMember(EmitDefaultValue = false)]
+        public string EmployerIdentificationNumber { get; set; }
+
         [DataMember(EmitDefaultValue = false)]
         public DateTime? PeriodLockDate { get; set; }