diff --git a/Framework/YLErp.Core/DBModels/TradeExtend.cs b/Framework/YLErp.Core/DBModels/TradeExtend.cs
index 883010c5..15829dd4 100644
--- a/Framework/YLErp.Core/DBModels/TradeExtend.cs
+++ b/Framework/YLErp.Core/DBModels/TradeExtend.cs
@@ -97,6 +97,13 @@ namespace YLErp.DBModels
         [JsonIgnore]
         public bool CalcLast => InterestCalcMode?.EndsWith("1") ?? true;
 
+        /// <summary>
+        /// 是否罚息（EQD-6977）：提前终止平仓时利息端按持有至到期计息的簿记默认值。
+        /// 平仓页默认带出此值、可修改，以平仓时选择为准（当次选择经 UnwindData.IsPenaltyInterest 走请求，不回写）。
+        /// 存量 JSON 无此键 → 反序列化默认 false（"否"），零回填。
+        /// </summary>
+        public bool IsPenaltyInterest { get; set; }
+
         /// <summary>
         ///多空组合浮动端 收取方向 1：收取，2：支付
         /// </summary>
diff --git a/YLErpDAL/Modules/SwapModule/SwapDealService.cs b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
index 1160d34f..0a238637 100644
--- a/YLErpDAL/Modules/SwapModule/SwapDealService.cs
+++ b/YLErpDAL/Modules/SwapModule/SwapDealService.cs
@@ -258,6 +258,8 @@ namespace YLErp.Modules.SwapModule
                 unwindData.PosiNotionalValue = Convert.ToDecimal(td.StockEqvNotional);
                 unwindData.PositionQty = position != null ? position.PosiQuantity : Convert.ToDecimal(td.TradeAmount);
                 unwindData.AnnualDays = tradeExtend == null ? 365 : tradeExtend.ExtendObj.AnnualDays;
+                // EQD-6977 罚息：平仓页「是否罚息」默认带出簿记值；以平仓时选择为准（可改），此处仅默认值
+                unwindData.IsPenaltyInterest = tradeExtend != null && tradeExtend.ExtendObj.IsPenaltyInterest;
                 unwindData.CloseMethod = (int)CloseMethodEnum.全部平仓;
                 // 占期初(original)语义(A)：默认"平掉剩余全部持仓" = 剩余名义本金/期初名义本金。
                 // 未平仓时 PosiNotionalValue==NotionalValue → 1（平100%）；部分平仓后自动变为剩余比例（如已平10%则默认90%）。
diff --git a/YLErpWeb/Controllers/SwapTrade2Controller.cs b/YLErpWeb/Controllers/SwapTrade2Controller.cs
index 2f282b7b..33c82881 100644
--- a/YLErpWeb/Controllers/SwapTrade2Controller.cs
+++ b/YLErpWeb/Controllers/SwapTrade2Controller.cs
@@ -400,13 +400,13 @@ namespace YLErp.Web.Controllers
         /// <param name="tradeId"></param>
         /// <param name="closePercent"></param>
         /// <returns></returns>
-        public JsonResult GetUnwindInterestList(DateTime valueDate,DateTime unwindDate, int tradeId, decimal closePercent, int eventType, decimal notionalValue = 0, decimal posiNotionalValue = 0)
+        public JsonResult GetUnwindInterestList(DateTime valueDate,DateTime unwindDate, int tradeId, decimal closePercent, int eventType, decimal notionalValue = 0, decimal posiNotionalValue = 0, bool isPenaltyInterest = false)
         {
             unwindDate = valueDate;
             // 前端按"占期初(original)"语义传 closePercent(A)；后端 GetUnwindInterests 按"占剩余(remaining)"语义(B)计算。
             // 多空互换前端不传 notionalValue/posiNotionalValue（默认 0），则跳过转换保持原行为。
             var convertedClosePercent = SwapDealService.ToRemainingClosePercent(closePercent, notionalValue, posiNotionalValue);
-            var interests = new SwapDealService(CurUser).GetUnwindInterests(valueDate, unwindDate, tradeId, convertedClosePercent, eventType);
+            var interests = new SwapDealService(CurUser).GetUnwindInterests(valueDate, unwindDate, tradeId, convertedClosePercent, eventType, isPenaltyInterest);
             foreach (var interest in interests)
             {
                 interest.TdInterestAmount=Math.Round(interest.TdInterestAmount, ConsGlobal.MoneyRound,MidpointRounding.AwayFromZero);