diff --git a/system1-factory/api/controllers/vacationRequestController.js b/system1-factory/api/controllers/vacationRequestController.js
index 8ec44a7..3fc74a5 100644
--- a/system1-factory/api/controllers/vacationRequestController.js
+++ b/system1-factory/api/controllers/vacationRequestController.js
@@ -201,6 +201,15 @@ const vacationRequestController = {
         return res.status(400).json({ success: false, message: '이미 처리된 신청입니다' });
       }
 
+      // sp_vacation_balances 차감 (특별휴가 우선 → 이월 → 기본 순서)
+      const request = results[0];
+      const year = new Date(request.start_date).getFullYear();
+      const daysUsed = parseFloat(request.days_used) || 0;
+      if (daysUsed > 0) {
+        const vacationBalanceModel = require('../models/vacationBalanceModel');
+        await vacationBalanceModel.deductByPriority(request.user_id, year, daysUsed);
+      }
+
       await vacationRequestModel.updateStatus(id, { status: 'approved', reviewed_by, review_note });
       res.json({ success: true, message: '휴가 신청이 승인되었습니다' });
     } catch (error) {