diff --git a/erpnext/public/js/controllers/taxes_and_totals.js b/erpnext/public/js/controllers/taxes_and_totals.js
index aeceda4982..4b14d08eda 100644
--- a/erpnext/public/js/controllers/taxes_and_totals.js
+++ b/erpnext/public/js/controllers/taxes_and_totals.js
@@ -5,9 +5,10 @@ erpnext.taxes_and_totals = erpnext.payments.extend({
 	setup: function() {},
 	apply_pricing_rule_on_item: function(item){
 		if(item.margin_type == "Percentage"){
-			item.total_margin = item.price_list_rate + item.price_list_rate * ( item.margin_rate_or_amount / 100);
+			item.total_margin = flt(item.price_list_rate) 
+				+ flt(item.price_list_rate) * ( flt(item.margin_rate_or_amount) / 100);
 		}else{
-			item.total_margin = item.price_list_rate + item.margin_rate_or_amount;
+			item.total_margin = flt(item.price_list_rate) + flt(item.margin_rate_or_amount);
 		}
 
 		item.rate = flt(item.total_margin , precision("rate", item));