diff --git a/app/Http/Controllers/Api/Admin/HR/PayrollController.php b/app/Http/Controllers/Api/Admin/HR/PayrollController.php
index 927f0dff..9522c7d2 100644
--- a/app/Http/Controllers/Api/Admin/HR/PayrollController.php
+++ b/app/Http/Controllers/Api/Admin/HR/PayrollController.php
@@ -79,7 +79,7 @@ public function store(Request $request): JsonResponse
             'allowances.*.amount' => 'required_with:allowances|numeric|min:0',
             'deductions' => 'nullable|array',
             'deductions.*.name' => 'required_with:deductions|string',
-            'deductions.*.amount' => 'required_with:deductions|numeric|min:0',
+            'deductions.*.amount' => 'required_with:deductions|numeric',
             'deduction_overrides' => 'nullable|array',
             'deduction_overrides.pension' => 'nullable|numeric|min:0',
             'deduction_overrides.health_insurance' => 'nullable|numeric|min:0',
@@ -128,7 +128,7 @@ public function update(Request $request, int $id): JsonResponse
             'allowances.*.amount' => 'required_with:allowances|numeric|min:0',
             'deductions' => 'nullable|array',
             'deductions.*.name' => 'required_with:deductions|string',
-            'deductions.*.amount' => 'required_with:deductions|numeric|min:0',
+            'deductions.*.amount' => 'required_with:deductions|numeric',
             'deduction_overrides' => 'nullable|array',
             'deduction_overrides.pension' => 'nullable|numeric|min:0',
             'deduction_overrides.health_insurance' => 'nullable|numeric|min:0',
diff --git a/resources/views/hr/payrolls/index.blade.php b/resources/views/hr/payrolls/index.blade.php
index a82b43d4..02aea483 100644
--- a/resources/views/hr/payrolls/index.blade.php
+++ b/resources/views/hr/payrolls/index.blade.php
@@ -561,7 +561,7 @@ function doRecalculate() {
         document.querySelectorAll('#deductionsContainer > div').forEach(row => {
             const name = row.querySelector('.deduction-name').value;
             const amount = parseMoneyValue(row.querySelector('.deduction-amount'));
-            if (name && amount > 0) deductions.push({name, amount});
+            if (name && amount !== 0) deductions.push({name, amount});
         });
 
         const data = {
@@ -671,9 +671,11 @@ function parseMoneyValue(el) {
     function formatMoneyInput(el) {
         const pos = el.selectionStart;
         const oldLen = el.value.length;
+        const isNeg = el.value.indexOf('-') === 0;
         const raw = el.value.replace(/[^0-9]/g, '');
         const num = parseInt(raw, 10);
-        el.value = isNaN(num) ? '' : num.toLocaleString('ko-KR');
+        if (isNaN(num)) { el.value = isNeg ? '-' : ''; return; }
+        el.value = (isNeg ? '-' : '') + num.toLocaleString('ko-KR');
         const newLen = el.value.length;
         const newPos = Math.max(0, pos + (newLen - oldLen));
         el.setSelectionRange(newPos, newPos);
@@ -689,7 +691,7 @@ function moneyBlur(el) {
 
     function setMoneyValue(el, val) {
         const num = parseInt(val, 10) || 0;
-        el.value = num === 0 ? '0' : num.toLocaleString('ko-KR');
+        el.value = num === 0 ? '0' : Number(num).toLocaleString('ko-KR');
     }
 
     // ===== 급여 저장 =====
@@ -705,7 +707,7 @@ function submitPayroll() {
         document.querySelectorAll('#deductionsContainer > div').forEach(row => {
             const name = row.querySelector('.deduction-name').value;
             const amount = parseMoneyValue(row.querySelector('.deduction-amount'));
-            if (name && amount > 0) deductions.push({name, amount});
+            if (name && amount !== 0) deductions.push({name, amount});
         });
 
         // 수동 수정된 공제 항목 override