diff --git a/app/Http/Controllers/Finance/SalesCommissionController.php b/app/Http/Controllers/Finance/SalesCommissionController.php
index 50bd87b1..0692b5cd 100644
--- a/app/Http/Controllers/Finance/SalesCommissionController.php
+++ b/app/Http/Controllers/Finance/SalesCommissionController.php
@@ -271,7 +271,14 @@ public function updateCommissionDate(int $id, Request $request): JsonResponse
             return response()->json(['success' => false, 'message' => '인계 상태일 때만 수당지급일 설정 가능'], 422);
         }
 
-        $commission->update([$validated['field'] => $validated['value'] ?: null]);
+        $value = $validated['value'];
+        if ($validated['field'] === 'referrer_commission') {
+            $value = (int) ($value ?: 0);
+        } else {
+            $value = $value ?: null;
+        }
+
+        $commission->update([$validated['field'] => $value]);
 
         return response()->json(['success' => true]);
     }