diff --git a/addons/account/static/src/js/account_reconciliation_widgets.js b/addons/account/static/src/js/account_reconciliation_widgets.js
index a2b0f66d9b7..5d00984157c 100644
--- a/addons/account/static/src/js/account_reconciliation_widgets.js
+++ b/addons/account/static/src/js/account_reconciliation_widgets.js
@@ -1000,7 +1000,7 @@ var abstractReconciliationLine = Widget.extend({
             var tax_id = self.tax_id_field.get("value");
             if (amount && tax_id) {
                 deferred_tax = self.model_tax
-                    .call("json_friendly_compute_all", [[tax_id], amount, self.get("currency_id")])
+                    .call("json_friendly_compute_all", [[tax_id], amount, self.get("currency_id")], {context: {round: true}}) // just as the python will do
                     .then(function(data){
                         line_created_being_edited.length = 1; // remove tax lines
                         line_created_being_edited[0].amount_before_tax = amount;