diff --git a/backend/hubspot_trigger_orchestrator/hubspot_deal_differ.py b/backend/hubspot_trigger_orchestrator/hubspot_deal_differ.py
index ad20aca7..8f96ce73 100644
--- a/backend/hubspot_trigger_orchestrator/hubspot_deal_differ.py
+++ b/backend/hubspot_trigger_orchestrator/hubspot_deal_differ.py
@@ -20,6 +20,7 @@ class HubspotDealDiffer:
             "v2 ioe/mtp complete",
         ]
         RETROFIT_DESIGN_COMPLETE = "uploaded"
+        LODGEMENT_COMPLETE: List[str] = ["lodgement complete", "measures lodged"]
 
         new_pashub_link: str = new_deal.get("pashub_link", "")
 
@@ -53,7 +54,17 @@ class HubspotDealDiffer:
         ):
             return True
 
-        raise NotImplementedError
+        # Case 4
+        new_lodgement_status: str = new_deal.get("lodgement_status", "")
+
+        if (
+            new_lodgement_status
+            and new_lodgement_status in LODGEMENT_COMPLETE
+            and new_lodgement_status != old_deal.lodgement_status
+        ):
+            return True
+
+        return False
 
     @staticmethod
     def check_for_db_update_trigger(