diff --git a/src/client/stores/CalculationStore/Effects/action.ts b/src/client/stores/CalculationStore/Effects/action.ts
index 867afa3..cea5f05 100644
--- a/src/client/stores/CalculationStore/Effects/action.ts
+++ b/src/client/stores/CalculationStore/Effects/action.ts
@@ -414,8 +414,10 @@ const actions: TAction = {
         );
         CalculationStore.setValue(
           'resultBonusMPL',
-          (res.columns.npvBonusExpensesColumn?.values[2] || 0) /
-            (1 + preparedData.preparedValues.salaryRate),
+          Math.abs(
+            (res.columns.npvBonusExpensesColumn?.values[2] || 0) /
+              (1 + preparedData.preparedValues.salaryRate),
+          ),
         );
 
         //set values