diff --git a/Abrechnung/form.json b/Abrechnung/form.json
index 92235cb..ae3ef07 100644
--- a/Abrechnung/form.json
+++ b/Abrechnung/form.json
@@ -19,6 +19,23 @@
       "name": "FooterText",
       "caption": "Fusszeile"
     },
+    {
+      "type": "Label",
+      "caption": "⚖️ Mehrwertsteuer (MWST)"
+    },
+    {
+      "type": "CheckBox",
+      "name": "EnableVAT",
+      "caption": "Mehrwertsteuer berechnen und ausweisen"
+    },
+    {
+      "type": "NumberSpinner",
+      "name": "VATPercentage",
+      "caption": "MWST-Satz in %",
+      "digits": 2,
+      "minimum": 0,
+      "maximum": 100
+    },
     {
       "type": "Label",
       "caption": "🏦 QR-Einzahlungsschein Daten"
diff --git a/Abrechnung/module.php b/Abrechnung/module.php
index 80c527e..6266c25 100644
--- a/Abrechnung/module.php
+++ b/Abrechnung/module.php
@@ -47,6 +47,10 @@ class Abrechnung extends IPSModule
         $this->RegisterPropertyInteger('LogoMediaID', 0);
         $this->RegisterPropertyString('PropertyText', 'Liegenschaft');
         $this->RegisterPropertyString('FooterText', 'Belevo AG • 6122 Menznau • www.belevo.ch');
+        
+        // NEU: MWST Variablen registrieren (Standard 8.1%)
+        $this->RegisterPropertyBoolean('EnableVAT', false);
+        $this->RegisterPropertyFloat('VATPercentage', 8.1);
 
         // Neue Felder für den QR-Schein
         $this->RegisterPropertyString('CreditorName', 'Belevo AG');
@@ -229,13 +233,45 @@ public function GenerateInvoices()
         $html .= $additionalResult['html'];
         $totalAdditional = $additionalResult['sum'];
 
-        // ========================= Gesamttotal =========================
-        $grandTotal = $totalPower + $totalAdditional;
-        $html .= "
-        <h2 style='margin:0 0 0 0; font-size:11px;'>
-        Gesamttotal: <strong>CHF " . number_format($grandTotal, 2) . ".-</strong>
-        </h2>
-        ";
+        // ========================= Gesamttotal & MWST =========================
+        $subTotal = $totalPower + $totalAdditional;
+        $enableVAT = $this->ReadPropertyBoolean('EnableVAT');
+        
+        $html .= "<table width='100%' style='font-size:10px;' cellpadding='2'>";
+        
+        if ($enableVAT) {
+            $vatPercent = $this->ReadPropertyFloat('VATPercentage');
+            $vatAmount = $subTotal * ($vatPercent / 100);
+            $grandTotal = $subTotal + $vatAmount;
+            
+            $html .= "
+            <tr>
+                <td width='75%' align='right'>Zwischentotal (exkl. MWST):</td>
+                <td width='25%' align='right'>CHF " . number_format($subTotal, 2, '.', "'") . "</td>
+            </tr>
+            <tr>
+                <td width='75%' align='right'>zuzüglich " . number_format($vatPercent, 1, '.', "'") . " % MWST:</td>
+                <td width='25%' align='right'>CHF " . number_format($vatAmount, 2, '.', "'") . "</td>
+            </tr>
+            <tr>
+                <td width='75%' align='right' style='font-size:12px;'><br><strong>Gesamttotal (inkl. MWST):</strong></td>
+                <td width='25%' align='right' style='font-size:12px;'><br><strong>CHF " . number_format($grandTotal, 2, '.', "'") . "</strong></td>
+            </tr>
+            </table>";
+        } else {
+            $grandTotal = $subTotal;
+            $html .= "
+            <tr>
+                <td width='75%' align='right' style='font-size:12px;'><strong>Gesamttotal:</strong></td>
+                <td width='25%' align='right' style='font-size:12px;'><strong>CHF " . number_format($grandTotal, 2, '.', "'") . "</strong></td>
+            </tr>
+            <tr>
+                <td colspan='2' align='right' style='font-size:8px; color:#555;'><br>Nicht mehrwertsteuerpflichtig.</td>
+            </tr>
+            </table>
+            ";
+        }
+
         $pdf->writeHTML($html, true, false, true, false, '');
 
         // WICHTIG: Total zurückgeben für den Einzahlungsschein