diff --git a/EvoCalculator.Core.Calculation/BaseCalculation.cs b/EvoCalculator.Core.Calculation/BaseCalculation.cs
index 3eded4a..d82afa2 100644
--- a/EvoCalculator.Core.Calculation/BaseCalculation.cs
+++ b/EvoCalculator.Core.Calculation/BaseCalculation.cs
@@ -8,7 +8,7 @@ namespace EvoCalculator.Core.Calculation;
 
 public class BaseCalculation
 {
-    const double IRR = 0.17;
+    const double IRR = 0.155;
     private Constants.Calculation constants;
 
     public BaseCalculation()