diff --git a/src/main/java/com/ffii/fpsms/modules/stock/service/StockTakeRecordService.kt b/src/main/java/com/ffii/fpsms/modules/stock/service/StockTakeRecordService.kt
index 5171164..79a4281 100644
--- a/src/main/java/com/ffii/fpsms/modules/stock/service/StockTakeRecordService.kt
+++ b/src/main/java/com/ffii/fpsms/modules/stock/service/StockTakeRecordService.kt
@@ -331,18 +331,24 @@ open class StockTakeRecordService(
         val selectedQty = resolvePickerQtyForVarianceFilter(response)
         val bookQty = response.bookQty ?: response.availableQty ?: BigDecimal.ZERO
         val difference = selectedQty.subtract(bookQty)
-        if (bookQty.compareTo(BigDecimal.ZERO) != 0) {
-            return difference
+        val raw = if (bookQty.compareTo(BigDecimal.ZERO) != 0) {
+            difference
                 .divide(bookQty, 6, RoundingMode.HALF_UP)
                 .multiply(BigDecimal("100"))
+        } else {
+            when {
+                difference.compareTo(BigDecimal.ZERO) == 0 -> BigDecimal.ZERO
+                difference.compareTo(BigDecimal.ZERO) > 0 -> BigDecimal("100")
+                else -> BigDecimal("-100")
+            }
         }
-        return when {
-            difference.compareTo(BigDecimal.ZERO) == 0 -> BigDecimal.ZERO
-            difference.compareTo(BigDecimal.ZERO) > 0 -> BigDecimal("100")
-            else -> BigDecimal("-100")
-        }
+        return roundDownVariancePercent(raw)
     }
 
+    /** 與前端顯示一致：差異% 小數向零方向捨去（-48.43 → -48，48.9 → 48） */
+    private fun roundDownVariancePercent(vp: BigDecimal): BigDecimal =
+        vp.setScale(0, RoundingMode.DOWN)
+
     /**
      * @param varianceFilterInclusive false：只保留區間外（vp ≤ -t 或 vp ≥ t）；
      *                                true：只保留區間內（-t ≤ vp ≤ t）
@@ -568,6 +574,35 @@ open class StockTakeRecordService(
 
         return result.sortedBy { it.stockTakeSession }
     }
+
+    /**
+     * 全系統最新盤點輪次 id（MAX(stockTakeRoundId)）；舊資料無 roundId 時退回 planStart 最新一筆。
+     */
+    open fun resolveGlobalLatestStockTakeRoundKey(): Long? {
+        val maxRound = stockTakeRepository.findMaxStockTakeRoundId()
+        if (maxRound > 0L) {
+            return maxRound
+        }
+        val latest = stockTakeRepository.findAll()
+            .filter { !it.deleted }
+            .maxByOrNull { it.planStart ?: LocalDateTime.MIN }
+        return latest?.let { st -> st.stockTakeRoundId ?: st.id }
+    }
+
+    open fun getGlobalLatestStockTakeRoundMeta(): LatestStockTakeRoundMetaResponse {
+        val roundKey = resolveGlobalLatestStockTakeRoundKey()
+        if (roundKey == null || roundKey <= 0L) {
+            return LatestStockTakeRoundMetaResponse(stockTakeRoundId = null, planStartDate = null)
+        }
+        val byRound = stockTakeRepository.findAllByStockTakeRoundIdAndDeletedIsFalse(roundKey)
+        val planStart = if (byRound.isNotEmpty()) {
+            byRound.mapNotNull { it.planStart }.maxOrNull()?.toLocalDate()
+        } else {
+            stockTakeRepository.findByIdAndDeletedIsFalse(roundKey)?.planStart?.toLocalDate()
+        }
+        return LatestStockTakeRoundMetaResponse(stockTakeRoundId = roundKey, planStartDate = planStart)
+    }
+
     open fun getApproverInventoryLotDetailsAll(
         stockTakeId: Long? = null,
         pageNum: Int = 0,
diff --git a/src/main/java/com/ffii/fpsms/modules/stock/web/StockTakeRecordController.kt b/src/main/java/com/ffii/fpsms/modules/stock/web/StockTakeRecordController.kt
index 6fc9864..fd2cf94 100644
--- a/src/main/java/com/ffii/fpsms/modules/stock/web/StockTakeRecordController.kt
+++ b/src/main/java/com/ffii/fpsms/modules/stock/web/StockTakeRecordController.kt
@@ -73,12 +73,8 @@ class StockTakeRecordController(
             }
         }
         if (onlyLatestRound) {
-            val latestRoundKey = all
-                .mapNotNull { item ->
-                    item.stockTakeRoundId ?: item.stockTakeId.takeIf { it > 0 }
-                }
-                .maxOrNull()
-            all = if (latestRoundKey == null) {
+            val latestRoundKey = stockOutRecordService.resolveGlobalLatestStockTakeRoundKey()
+            all = if (latestRoundKey == null || latestRoundKey <= 0L) {
                 emptyList()
             } else {
                 all.filter { (it.stockTakeRoundId ?: it.stockTakeId) == latestRoundKey }
@@ -90,6 +86,12 @@ class StockTakeRecordController(
         val pageList = if (fromIndex >= total) emptyList() else all.subList(fromIndex, toIndex)
         return RecordsRes(pageList, total)
     }
+
+    @GetMapping("/latestStockTakeRoundMeta")
+    fun latestStockTakeRoundMeta(): LatestStockTakeRoundMetaResponse {
+        return stockOutRecordService.getGlobalLatestStockTakeRoundMeta()
+    }
+
     @GetMapping("/approverInventoryLotDetailsAll")
     fun getApproverInventoryLotDetailsAll(
         @RequestParam(required = false) stockTakeId: Long?,                    // 可选：限定某个 stockTake