diff --git a/backend/app/services/cache.py b/backend/app/services/cache.py
index b81474957..672e3f9d6 100644
--- a/backend/app/services/cache.py
+++ b/backend/app/services/cache.py
@@ -10,7 +10,7 @@ async def get_revenue_summary(property_id: str, tenant_id: str) -> Dict[str, Any
     """
     Fetches revenue summary, utilizing caching to improve performance.
     """
-    cache_key = f"revenue:{property_id}"
+    cache_key = f"revenue:{tenant_id}:{property_id}"
     
     # Try to get from cache
     cached = await redis_client.get(cache_key)
diff --git a/backend/app/services/reservations.py b/backend/app/services/reservations.py
index 384bd00ab..a4596b83f 100644
--- a/backend/app/services/reservations.py
+++ b/backend/app/services/reservations.py
@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timezone
 from decimal import Decimal
 from typing import Dict, Any, List
 
@@ -7,11 +7,11 @@ async def calculate_monthly_revenue(property_id: str, month: int, year: int, db_
     Calculates revenue for a specific month.
     """
 
-    start_date = datetime(year, month, 1)
+    start_date = datetime(year, month, 1, tzinfo=timezone.utc)
     if month < 12:
-        end_date = datetime(year, month + 1, 1)
+        end_date = datetime(year, month + 1, 1, tzinfo=timezone.utc)
     else:
-        end_date = datetime(year + 1, 1, 1)
+        end_date = datetime(year + 1, 1, 1, tzinfo=timezone.utc)
         
     print(f"DEBUG: Querying revenue for {property_id} from {start_date} to {end_date}")