diff --git a/rattail/trainwreck/db/model.py b/rattail/trainwreck/db/model.py
index 9a539ce4..b60a303d 100644
--- a/rattail/trainwreck/db/model.py
+++ b/rattail/trainwreck/db/model.py
@@ -222,6 +222,14 @@ class TransactionItemBase(object):
     Subtotal for the line item, i.e. quantity times unit price.
     """)
 
+    gross_sales = sa.Column(sa.Numeric(precision=9, scale=2), nullable=True, doc="""
+    Gross sales amount for the line item.  Meaning of this may vary slightly?
+    """)
+
+    net_sales = sa.Column(sa.Numeric(precision=9, scale=2), nullable=True, doc="""
+    Net sales amount for the line item.  Meaning of this may vary slightly?
+    """)
+
     tax = sa.Column(sa.Numeric(precision=8, scale=2), nullable=True, doc="""
     Tax total (for all tax levels) for the line item.
     """)