diff --git a/App.tsx b/App.tsx
index 7c35423..9df7ea8 100644
--- a/App.tsx
+++ b/App.tsx
@@ -173,12 +173,17 @@ const App: React.FC = () => {
     }
   }, []);
 
-  // Update forecast when customer filter changes
+  // Update forecast when filters change
   useEffect(() => {
     if (rawData.length > 0) {
-      handleForecastFetch(rawData, filters.customer);
+      // Filter rawData to respect customer selections but keep all years (2025 for seasonality, 2026 for actuals)
+      const forecastRelevantData = filterData(rawData, {
+        ...filters,
+        year: [] // Ensure we don't filter out 2025/2026 if a single year is selected in UI
+      });
+      handleForecastFetch(forecastRelevantData, filters.customer);
     }
-  }, [filters.customer, rawData, handleForecastFetch]);
+  }, [filters, rawData, handleForecastFetch]);
 
   const initializeData = (data: SalesRecord[]) => {
     setRawData(data);