diff --git a/inventory-backend/app/services/outbound_service.py b/inventory-backend/app/services/outbound_service.py
index eb65a1a..5da6ad6 100644
--- a/inventory-backend/app/services/outbound_service.py
+++ b/inventory-backend/app/services/outbound_service.py
@@ -48,7 +48,7 @@ class OutboundService:
             if table_type == 'stock_product':
                 return float(item.sale_price) if item.sale_price else 0
             elif table_type == 'stock_buy':
-                return float(item.unit_price) if item.unit_price else 0
+                return float(item.pre_tax_unit_price) if item.pre_tax_unit_price else 0
             return 0
 
         prod = StockProduct.query.filter(