diff --git a/quickbooks/objects/invoice.py b/quickbooks/objects/invoice.py
index 0aed1c6a..c4ce710e 100644
--- a/quickbooks/objects/invoice.py
+++ b/quickbooks/objects/invoice.py
@@ -67,6 +67,7 @@ def __init__(self):
         self.ShipDate = ""
         self.TrackingNum = ""
         self.TotalAmt = ""
+        self.TxnDate = ""
         self.ApplyTaxAfterDiscount = False
         self.PrintStatus = "NotSet"
         self.EmailStatus = "NotSet"