diff --git a/erpnext/selling/sales_common.js b/erpnext/selling/sales_common.js
index f440315..e905de1 100644
--- a/erpnext/selling/sales_common.js
+++ b/erpnext/selling/sales_common.js
@@ -471,8 +471,11 @@
 				var diff = this.frm.doc.net_total_export
 					- flt(last_tax.total / this.frm.doc.conversion_rate, precision("grand_total_export"));
 
-				if ( diff && Math.abs(diff) <= (2.0 / Math.pow(10, precision("total", last_tax)) ) {
-					last_tax.total += flt(diff * this.frm.doc.conversion_rate, precision("total", last_tax));
+				if ( diff && Math.abs(diff) <= (2.0 / Math.pow(10, precision("tax_amount", last_tax))) ) {
+					var adjustment_amount = flt(diff * this.frm.doc.conversion_rate, precision("tax_amount", last_tax));
+					last_tax.tax_amount += adjustment_amount;
+					last_tax.tax_amount_after_discount += adjustment_amount;
+					last_tax.total += adjustment_amount;
 				}
 			}
 		}