diff --git a/Shared/Services/Calculations.cs b/Shared/Services/Calculations.cs
index 0340845b9..1947ba851 100644
--- a/Shared/Services/Calculations.cs
+++ b/Shared/Services/Calculations.cs
@@ -1598,10 +1598,10 @@ namespace BS.Shared.Services
                                     intervalEnd = intervalStart.AddYears(1);
                                     break;
                                 case AccountingIntervalType.FlatRate:
-                                    intervalEnd = dtEnd.Value;
+                                    intervalEnd = dtEnd.Value.AddDays(1);
                                     break;
                                 default:
-                                    intervalEnd = dtEnd.Value;
+                                    intervalEnd = dtEnd.Value.AddDays(1);
                                     break;
 
                             }