diff --git a/user-management/web/index.html b/user-management/web/index.html
index 3a0d539..e3553be 100644
--- a/user-management/web/index.html
+++ b/user-management/web/index.html
@@ -2424,7 +2424,7 @@
     <script src="/static/js/tkuser-issue-types.js?v=2026031401"></script>
     <script src="/static/js/tkuser-workplaces.js?v=2026031401"></script>
     <script src="/static/js/tkuser-tasks.js?v=2026031401"></script>
-    <script src="/static/js/tkuser-vacations.js?v=2026033102"></script>
+    <script src="/static/js/tkuser-vacations.js?v=2026033103"></script>
     <script src="/static/js/tkuser-vacation-settings.js?v=2026032501"></script>
     <script src="/static/js/tkuser-layout-map.js?v=2026031401"></script>
     <script src="/static/js/tkuser-partners.js?v=2026031601"></script>
diff --git a/user-management/web/static/js/tkuser-vacations.js b/user-management/web/static/js/tkuser-vacations.js
index dddcec5..09ecae7 100644
--- a/user-management/web/static/js/tkuser-vacations.js
+++ b/user-management/web/static/js/tkuser-vacations.js
@@ -320,10 +320,11 @@ async function autoCalcVacation() {
     } catch(e) { showToast(e.message, 'error'); }
 }
 
-// vacation_type_id 자동 매핑 (vacTypes에서 type_code로 찾기)
+// vacation_type_id 자동 매핑 (vacTypes에서 type_code로 찾기, fallback 내장)
+const VAC_TYPE_FALLBACK = { ANNUAL_FULL: 1, CARRYOVER: 6, LONG_SERVICE: 7 };
 function getVacTypeId(typeCode) {
     const t = vacTypes.find(v => v.type_code === typeCode);
-    return t ? t.id : null;
+    return t ? t.id : (VAC_TYPE_FALLBACK[typeCode] || 1);
 }
 
 // balance_type 변경 시 vacation_type_id + expires_at + 경조사 드롭다운 조정
@@ -444,9 +445,16 @@ document.getElementById('vacBalanceForm').addEventListener('submit', async e =>
             })});
             showToast('수정되었습니다.');
         } else {
+            // vacation_type_id: hidden input에서 가져오되, 빈값이면 balance_type 기반 자동 결정
+            let vacTypeId = parseInt(document.getElementById('vbType').value);
+            if (!vacTypeId || isNaN(vacTypeId)) {
+                const bt = document.getElementById('vbBalanceType').value;
+                const btMap = { AUTO: 'ANNUAL_FULL', MANUAL: 'ANNUAL_FULL', CARRY_OVER: 'CARRYOVER', LONG_SERVICE: 'LONG_SERVICE' };
+                vacTypeId = getVacTypeId(btMap[bt] || 'ANNUAL_FULL');
+            }
             await api('/vacations/balances', { method: 'POST', body: JSON.stringify({
                 user_id: parseInt(document.getElementById('vbUser').value),
-                vacation_type_id: parseInt(document.getElementById('vbType').value),
+                vacation_type_id: vacTypeId,
                 year: parseInt(document.getElementById('vbYear').value),
                 total_days: parseFloat(document.getElementById('vbTotalDays').value) || 0,
                 used_days: parseFloat(document.getElementById('vbUsedDays').value) || 0,