diff --git a/routes/billing.js b/routes/billing.js
index 781c7d8..f81ee8b 100644
--- a/routes/billing.js
+++ b/routes/billing.js
@@ -342,5 +342,20 @@ router.get('/export/pdf/:invoiceId', requireAdmin, async (req, res) => {
   }
 });
 
+
+// POST – Rechnung stornieren
+router.post('/invoices/:id/cancel', requireAdmin, async (req, res) => {
+  const period = req.body.period || currentPeriod();
+  try {
+    await db.query(
+      "UPDATE invoices SET status='cancelled' WHERE id=?",
+      [req.params.id]
+    );
+    res.redirect(`/admin/billing?period=${period}&success=Rechnung+storniert`);
+  } catch (err) {
+    res.redirect(`/admin/billing?period=${period}&error=Fehler+beim+Stornieren`);
+  }
+});
+
 module.exports = router;
 module.exports.currentPeriod = currentPeriod;
diff --git a/routes/finance.js b/routes/finance.js
index ceb0652..f016689 100644
--- a/routes/finance.js
+++ b/routes/finance.js
@@ -93,6 +93,16 @@ router.get('/', requireAdmin, async (req, res) => {
       ORDER BY m.effective_end ASC
     `);
 
+    // Stornierte Rechnungen
+    const [cancelledInvoices] = await db.query(`
+      SELECT i.*, m.first_name, m.last_name, m.email, t.name as tariff_name
+      FROM invoices i
+      JOIN memberships m ON i.membership_id = m.id
+      LEFT JOIN tariffs t ON m.tariff_id = t.id
+      WHERE i.status = 'cancelled'
+      ORDER BY i.created_at DESC
+    `);
+
     // Alle Mitglieder für Dropdowns
     const [members] = await db.query(`
       SELECT m.id, m.first_name, m.last_name
@@ -121,6 +131,7 @@ router.get('/', requireAdmin, async (req, res) => {
       expiringContracts,
       members,
       openInvoicesDropdown,
+      cancelledInvoices,
       success: req.query.success || null,
       error: req.query.error || null
     });
diff --git a/views/admin/finance.ejs b/views/admin/finance.ejs
index 033237b..c58233d 100644
--- a/views/admin/finance.ejs
+++ b/views/admin/finance.ejs
@@ -74,6 +74,7 @@
       <button class="ftab" onclick="showTab('chargebacks', this)">↩️ Rückläufer</button>
       <button class="ftab" onclick="showTab('dunning', this)">📬 Mahngebühren</button>
       <button class="ftab" onclick="showTab('expiring', this)">⏳ Auslaufende Verträge</button>
+      <button class="ftab" onclick="showTab('cancelled', this)">🚫 Storniert</button>
       <button class="ftab" onclick="showTab('settings', this)">⚙️ Einstellungen</button>
     </div>
 
@@ -285,6 +286,55 @@
       </div>
     </div>
 
+
+    <!-- ===== TAB: STORNIERT ===== -->
+    <div class="ftab-content" id="tab-cancelled">
+      <div class="finance-card">
+        <h3>Stornierte Rechnungen (<%= cancelledInvoices.length %>)</h3>
+        <% if (cancelledInvoices.length === 0) { %>
+          <p class="karte-empty">Keine stornierten Rechnungen vorhanden.</p>
+        <% } else { %>
+        <div class="table-wrap">
+          <table class="admin-table">
+            <thead>
+              <tr>
+                <th>Nr.</th>
+                <th>Mitglied</th>
+                <th>Tarif</th>
+                <th>Periode</th>
+                <th>Betrag</th>
+                <th>Storniert am</th>
+                <th>Aktion</th>
+              </tr>
+            </thead>
+            <tbody>
+              <% cancelledInvoices.forEach(inv => { %>
+                <tr>
+                  <td class="invoice-nr">PF24-<%= String(inv.id).padStart(6,'0') %></td>
+                  <td>
+                    <strong><%= inv.last_name %>, <%= inv.first_name %></strong><br>
+                    <small class="text-muted"><%= inv.email %></small>
+                  </td>
+                  <td><%= inv.tariff_name || '–' %></td>
+                  <td><%= inv.period %></td>
+                  <td><span style="text-decoration:line-through;color:var(--text-muted)">
+                    <%= Number(inv.amount).toFixed(2).replace('.', ',') %> €
+                  </span></td>
+                  <td><%= new Date(inv.created_at).toLocaleDateString('de-DE') %></td>
+                  <td>
+                    <a href="/admin/billing?period=<%= inv.period %>" class="btn btn-sm btn-outline">
+                      Zur Abrechnung
+                    </a>
+                  </td>
+                </tr>
+              <% }) %>
+            </tbody>
+          </table>
+        </div>
+        <% } %>
+      </div>
+    </div>
+
     <!-- ===== TAB: EINSTELLUNGEN ===== -->
     <div class="ftab-content" id="tab-settings">
       <div class="finance-card" style="max-width:400px">
@@ -579,7 +629,7 @@ new Chart(ctx, {
 
 // Tabs
 const tabMap = {
-  chart: 0, open: 1, chargebacks: 2, dunning: 3, expiring: 4, settings: 5
+  chart: 0, open: 1, chargebacks: 2, dunning: 3, expiring: 4, cancelled: 5, settings: 6
 };
 
 function showTab(name, el) {