diff --git a/erpnext/public/js/controllers/buying.js b/erpnext/public/js/controllers/buying.js
index 0fd6c97..11655e9 100644
--- a/erpnext/public/js/controllers/buying.js
+++ b/erpnext/public/js/controllers/buying.js
@@ -113,8 +113,8 @@
 		var item = frappe.get_doc(cdt, cdn);
 		frappe.model.round_floats_in(item, ["price_list_rate", "discount_percentage"]);
 
-		item.rate = flt(item.price_list_rate * (1 - item.discount_percentage / 100.0),
-			precision("rate", item));
+		item.discount_amount = flt(item.price_list_rate) * flt(item.discount_percentage) / 100;
+		item.rate = flt((item.price_list_rate) - (item.discount_amount), precision('rate', item));
 
 		this.calculate_taxes_and_totals();
 	},
diff --git a/erpnext/public/js/controllers/taxes_and_totals.js b/erpnext/public/js/controllers/taxes_and_totals.js
index b6690cb..a31acfc 100644
--- a/erpnext/public/js/controllers/taxes_and_totals.js
+++ b/erpnext/public/js/controllers/taxes_and_totals.js
@@ -16,8 +16,8 @@
 		item.rate = flt(item.rate_with_margin , precision("rate", item));
 
 		if(item.discount_percentage){
-			var discount_value = flt(item.rate_with_margin) * flt(item.discount_percentage) / 100;
-			item.rate = flt((item.rate_with_margin) - (discount_value), precision('rate', item));
+			item.discount_amount = flt(item.rate_with_margin) * flt(item.discount_percentage) / 100;
+			item.rate = flt((item.rate_with_margin) - (item.discount_amount), precision('rate', item));
 		}
 	},