diff --git a/app/Http/Controllers/Sales/AdminProspectController.php b/app/Http/Controllers/Sales/AdminProspectController.php
index 885374c2..a41b20ad 100644
--- a/app/Http/Controllers/Sales/AdminProspectController.php
+++ b/app/Http/Controllers/Sales/AdminProspectController.php
@@ -448,6 +448,11 @@ public function updateCommissionDate(int $id, Request $request)
             $updateData[$autoField] = $autoDate;
         }
 
+        // 납입일 변경 시 지급예정일(scheduled_payment_date)도 재계산
+        if (in_array($field, ['first_payment_at', 'second_payment_at'])) {
+            $updateData['scheduled_payment_date'] = \Carbon\Carbon::parse($date)->addMonth()->day(10)->format('Y-m-d');
+        }
+
         $commission->update($updateData);
 
         $response = [