diff --git a/EvoCalculator.Core.PostCalculation/v1/Managers/CalculateDefault.cs b/EvoCalculator.Core.PostCalculation/v1/Managers/CalculateDefault.cs
index 51a7eb7..114982c 100644
--- a/EvoCalculator.Core.PostCalculation/v1/Managers/CalculateDefault.cs
+++ b/EvoCalculator.Core.PostCalculation/v1/Managers/CalculateDefault.cs
@@ -84,7 +84,7 @@ public static partial class CalculateManager
 
             var nextSumColumn = new SumColumnVT1(preparedValues.Nmper.Next + 1, nextDateTempColumn,
                 preparedValues, nextValues, currentTablePayments, nextTablePayments);
-            nextSumColumn.ComputeValues((decimal) currentSumColumn.IRR);
+            nextSumColumn.ComputeValues((decimal) currentSumColumn.IRR + preparedValues.IRRDelta);
             nextSumColumn.PostCheck();
             nextSumColumn.RoundValues();