diff --git a/modules/fatture/actions.php b/modules/fatture/actions.php
index 15a799930..dd9d7a038 100755
--- a/modules/fatture/actions.php
+++ b/modules/fatture/actions.php
@@ -244,10 +244,20 @@ switch (post('op')) {
             }
         } catch (Exception $e) {
         }
+        
+        $calculated = 0;
+
+        $fattura->scadenze()->each(function($scadenza) use (&$calculated) {
+            $calculated += abs($scadenza->da_pagare);
+        });
+
+        if(empty($calculated)){
+            $calculated = $fattura->netto;
+        }
 
         echo json_encode([
             'stored' => round($totale_documento,2),
-            'calculated' => round($fattura->totale,2),
+            'calculated' => round($calculated,2),
         ]);
         
         break;