diff --git a/EvoCalculator.Core.PostCalculation/v2/Columns/Next/SumRepaymentColumn/SumRepaymentColumnVT1.cs b/EvoCalculator.Core.PostCalculation/v2/Columns/Next/SumRepaymentColumn/SumRepaymentColumnVT1.cs
index 4156567..ab57d51 100644
--- a/EvoCalculator.Core.PostCalculation/v2/Columns/Next/SumRepaymentColumn/SumRepaymentColumnVT1.cs
+++ b/EvoCalculator.Core.PostCalculation/v2/Columns/Next/SumRepaymentColumn/SumRepaymentColumnVT1.cs
@@ -47,7 +47,7 @@ public class SumRepaymentColumnVT1 : BaseSumRepaymentColumn
                 .GetValues(1)
                 .Select((x, i) => -x * (1 + (decimal)constants.VatValue)
                                      * (preparedValues.TypeRepayment == 100_000_000
-                                         ? interpolation.Interpolate(i) / 100
+                                         ? interpolation.Interpolate(i + 1) / 100
                                          : (decimal)preparedValues.Repayment)))
         );