diff --git a/src/bnhtrade.Core/Model/Account/Invoice.cs b/src/bnhtrade.Core/Model/Account/Invoice.cs
index c908775..aae6d67 100644
--- a/src/bnhtrade.Core/Model/Account/Invoice.cs
+++ b/src/bnhtrade.Core/Model/Account/Invoice.cs
@@ -42,7 +42,7 @@ namespace bnhtrade.Core.Model.Account
 
     public abstract class Invoice : InvoiceHeader, IInvoice
     {
-        private bool unitAmountIsTaxExclusive = true;
+        private bool unitAmountIsTaxExclusive = false;
 
         public decimal InvoiceNetAmount { get; }