diff --git a/EvoCalculator.Core.Calculation/Columns/SumCurrentInterestColumn.cs b/EvoCalculator.Core.Calculation/Columns/SumCurrentInterestColumn.cs
index b7a8bbb..0e989be 100644
--- a/EvoCalculator.Core.Calculation/Columns/SumCurrentInterestColumn.cs
+++ b/EvoCalculator.Core.Calculation/Columns/SumCurrentInterestColumn.cs
@@ -10,7 +10,7 @@ namespace EvoCalculator.Core.Calculation.Columns
 
         public void ComputeValues(InterestColumn interestColumn)
         {
-            for (var i = 1; i < Values.Length; i++) Values[i] = interestColumn.Values.Skip(i).Sum(x => x);
+            for (var i = 1; i < Values.Length; i++) Values[i] = interestColumn.Values.Skip(i + 1).Sum(x => x);
         }
     }
 }
\ No newline at end of file
diff --git a/EvoCalculator.Core/Controllers/v1/CalculationController.cs b/EvoCalculator.Core/Controllers/v1/CalculationController.cs
index aa99d7e..e441ce6 100644
--- a/EvoCalculator.Core/Controllers/v1/CalculationController.cs
+++ b/EvoCalculator.Core/Controllers/v1/CalculationController.cs
@@ -86,9 +86,9 @@ namespace EvoCalculator.Core.Controllers.V1
 
             var kaskoBonusGrSumColumn = new KaskoBonusGrSumColumn(preparedValues.Nmper + 1);
             kaskoBonusGrSumColumn.ComputeValues(preparedValues, kaskoNmperGrColumn);
-            
+
             postValues.BonusBase.ComputeValue(preparedValues, kaskoBonusGrSumColumn);
-            
+
             var npvBonusExpensesColumn = new NPVBonusExpensesColumn(preparedValues.Nmper + 1);
             npvBonusExpensesColumn.ComputeValues(preparedValues, postValues);