diff --git a/wp-ingame-shop/wp-ingame-shop-pro.php b/wp-ingame-shop/wp-ingame-shop-pro.php
index bd3578a..4d3cf6b 100644
--- a/wp-ingame-shop/wp-ingame-shop-pro.php
+++ b/wp-ingame-shop/wp-ingame-shop-pro.php
@@ -374,6 +374,8 @@ class WIS_Activator {
             'wis_daily_deal_enabled'    => '0',
             'wis_daily_deal_discount'   => '20',
             'wis_api_key'               => bin2hex(random_bytes(24)),
+            'wis_tax_enabled'           => '0',
+            'wis_tax_rate'              => '0',
         ];
 
         foreach ($defaults as $key => $value) {
@@ -1230,6 +1232,8 @@ class WIS_Admin {
             update_option('wis_daily_deal_enabled', isset($_POST['wis_daily_deal_enabled']) ? '1' : '0');
             update_option('wis_daily_deal_discount', intval($_POST['wis_daily_deal_discount']));
             update_option('wis_offline_queue_enabled', isset($_POST['wis_offline_queue_enabled']) ? '1' : '0');
+            update_option('wis_tax_enabled', isset($_POST['wis_tax_enabled']) ? '1' : '0');
+            update_option('wis_tax_rate', max(0, min(100, floatval(str_replace(',', '.', $_POST['wis_tax_rate'] ?? '0')))));
             echo '<div class="updated"><p>✅ Einstellungen gespeichert!</p></div>';
         }
 
@@ -1357,6 +1361,24 @@ class WIS_Admin {
                                 <p class="description">Erfordert Spigot-Plugin v6.3+ mit Offline-Queue-Unterstützung</p>
                             </td>
                         </tr>
+                        <tr>
+                            <th>Steuer aktivieren</th>
+                            <td>
+                                <label>
+                                    <input type="checkbox" name="wis_tax_enabled" value="1" <?php checked(get_option('wis_tax_enabled', '0'), '1'); ?>>
+                                    Steuer auf den Endbetrag aufschlagen (nach Gutschein-Abzug)
+                                </label>
+                            </td>
+                        </tr>
+                        <tr>
+                            <th><label for="wis_tax_rate">Steuersatz (%)</label></th>
+                            <td>
+                                <input type="number" id="wis_tax_rate" name="wis_tax_rate"
+                                       value="<?php echo esc_attr(get_option('wis_tax_rate', '0')); ?>"
+                                       min="0" max="100" step="0.01" style="width:100px;">
+                                <p class="description">Z.B. <code>19</code> für 19 % MwSt. Nur aktiv wenn „Steuer aktivieren" angehakt ist.</p>
+                            </td>
+                        </tr>
                     </table>
                     <p class="submit">
                         <input type="submit" name="wis_save_settings" class="button button-primary" value="Einstellungen speichern">
@@ -3555,6 +3577,16 @@ class WIS_API {
         
         $final_price = max(0, $total_normal - $coupon_discount) + $total_offer;
 
+        // ── Steuer ──────────────────────────────────────────────────
+        $tax_enabled = get_option('wis_tax_enabled', '0');
+        $tax_rate    = floatval(get_option('wis_tax_rate', '0'));
+        $tax_amount  = 0;
+        if ($tax_enabled === '1' && $tax_rate > 0) {
+            $tax_amount  = floor($final_price * $tax_rate / 100);
+            $final_price = $final_price + $tax_amount;
+        }
+        // ────────────────────────────────────────────────────────────
+
         // Fly-Dauern (item_id → Sekunden)
         // Fly-Dauern und lesbares Label (wird dem Spieler auf dem Code angezeigt)
         $fly_durations = [
@@ -3936,6 +3968,17 @@ class WIS_Shortcode {
                         <div id="coupon-msg" class="wis-coupon-msg"></div>
                     </div>
                     
+                    <div id="wis-tax-breakdown" style="display:none; background:#f8f9fa; border-radius:6px; padding:10px 15px; margin-bottom:8px;">
+                        <div style="display:flex; justify-content:space-between; margin-bottom:4px; color:#555; font-size:0.95rem;">
+                            <span>Zwischensumme:</span>
+                            <span id="cart-subtotal">0 <?php echo esc_html($currency); ?></span>
+                        </div>
+                        <div style="display:flex; justify-content:space-between; color:#e67e22; font-size:0.95rem;">
+                            <span>⚖️ Steuer (<?php echo esc_attr(get_option('wis_tax_rate', '0')); ?>%):</span>
+                            <span id="cart-tax">0 <?php echo esc_html($currency); ?></span>
+                        </div>
+                    </div>
+
                     <div class="wis-cart-total">
                         <span>Gesamt:</span>
                         <span id="cart-total">0 <?php echo esc_html($currency); ?></span>
@@ -3964,6 +4007,8 @@ class WIS_Shortcode {
         (function() {
             const shopCurrency      = <?php echo json_encode($currency); ?>;
             const shopExcludeOffers = <?php echo $exclude_offers === '1' ? 'true' : 'false'; ?>;
+            const shopTaxEnabled    = <?php echo get_option('wis_tax_enabled', '0') === '1' ? 'true' : 'false'; ?>;
+            const shopTaxRate       = <?php echo floatval(get_option('wis_tax_rate', '0')); ?>;
             const apiBase           = <?php echo json_encode(rest_url('wis/v1')); ?>;
             const serverList        = <?php echo json_encode(array_map(function($s){ return ['slug'=>$s->slug,'name'=>$s->name]; }, $servers)); ?>;
 
@@ -4268,7 +4313,7 @@ class WIS_Shortcode {
                 document.getElementById('cart-modal').style.display = 'none';
             }
 
-            function calculateTotal() {
+            function calculateSubtotal() {
                 var normal = 0, offer = 0;
                 cart.forEach(function(item) {
                     var t = item.price * item.quantity;
@@ -4283,6 +4328,16 @@ class WIS_Shortcode {
                 return Math.max(0, normal - discount) + offer;
             }
 
+            function calculateTax(subtotal) {
+                if (!shopTaxEnabled || shopTaxRate <= 0) return 0;
+                return Math.floor(subtotal * shopTaxRate / 100);
+            }
+
+            function calculateTotal() {
+                var subtotal = calculateSubtotal();
+                return subtotal + calculateTax(subtotal);
+            }
+
             function renderCart() {
                 var content  = document.getElementById('cart-content');
                 var checkout = document.getElementById('cart-checkout');
@@ -4312,6 +4367,19 @@ class WIS_Shortcode {
                 });
 
                 document.getElementById('cart-total').textContent = calculateTotal() + ' ' + shopCurrency;
+
+                // Steuer-Aufschlüsselung
+                var taxBreakdown = document.getElementById('wis-tax-breakdown');
+                if (shopTaxEnabled && shopTaxRate > 0 && taxBreakdown) {
+                    var sub = calculateSubtotal();
+                    var tax = calculateTax(sub);
+                    document.getElementById('cart-subtotal').textContent = sub + ' ' + shopCurrency;
+                    document.getElementById('cart-tax').textContent      = tax + ' ' + shopCurrency;
+                    taxBreakdown.style.display = 'block';
+                } else if (taxBreakdown) {
+                    taxBreakdown.style.display = 'none';
+                }
+
                 checkout.style.display = 'block';
             }