diff --git a/resources/assets/js/script.js b/resources/assets/js/script.js
index f9a370987cbb..5d3e718ca2be 100644
--- a/resources/assets/js/script.js
+++ b/resources/assets/js/script.js
@@ -726,7 +726,7 @@ function calculateAmounts(invoice) {
     }
 
     // calculate line item tax
-    var lineTotal = NINJA.parseFloat(item.cost) * NINJA.parseFloat(item.qty);
+    var lineTotal = roundToFour(NINJA.parseFloat(item.cost)) * roundToFour(NINJA.parseFloat(item.qty));
     if (invoice.discount != 0) {
         if (parseInt(invoice.is_amount_discount)) {
             lineTotal -= roundToTwo((lineTotal/total) * invoice.discount);