diff --git a/app/controllers/Peppol_controller.php b/app/controllers/Peppol_controller.php
index d71ed22..f5767d8 100644
--- a/app/controllers/Peppol_controller.php
+++ b/app/controllers/Peppol_controller.php
@@ -1006,7 +1006,7 @@ class PEPPOL_peppol_controller {
             'total_amount_including_vat' => round($total_incl_vat, 2),
             'total_paid_amount'          => round($order->get_total(), 2),
             'total_payable_amount'       => round($order->get_total(), 2),
-            'amount_due'                 => 0,
+            'amount_due'                 => round($order->get_total() - $total_incl_vat, 2),
         ];
 
         $invoice_totals = \apply_filters('esi_peppol_invoice_totals', $invoice_totals, $order);