diff --git a/resources/js/components/IncomeDistributionPreview.tsx b/resources/js/components/IncomeDistributionPreview.tsx
index ad0c00b..d72154c 100644
--- a/resources/js/components/IncomeDistributionPreview.tsx
+++ b/resources/js/components/IncomeDistributionPreview.tsx
@@ -83,6 +83,8 @@ export default function IncomeDistributionPreview({ scenarioId }: IncomeDistribu
     };
 
     const handleApply = async () => {
+        if (isApplying) return;
+
         const parsed = parseFloat(amount);
         if (isNaN(parsed) || parsed <= 0) return;