diff --git a/routes/finance.js b/routes/finance.js
index 9689d53..261d13b 100644
--- a/routes/finance.js
+++ b/routes/finance.js
@@ -248,4 +248,103 @@ router.post('/dunning/:id/cancel', requireAdmin, async (req, res) => {
   }
 });
 
+
+// ============================================
+// Alle offenen Rückläufer mahnen
+// ============================================
+router.post('/chargebacks/dunning-all', requireAdmin, async (req, res) => {
+  const { amount, issued_date, reason } = req.body;
+  try {
+    const [openCBs] = await db.query(
+      "SELECT * FROM chargebacks WHERE status = 'open'", []
+    );
+    if (openCBs.length === 0) {
+      return res.redirect('/admin/finance?error=Keine+offenen+Rückläufer+vorhanden');
+    }
+    let count = 0;
+    for (const cb of openCBs) {
+      await db.query(
+        'INSERT INTO dunning_fees (membership_id, amount, reason, issued_date, notes) VALUES (?,?,?,?,?)',
+        [cb.membership_id, amount, reason || 'Mahngebühr Rücklastschrift', issued_date,
+         `Automatisch aus Rückläufer vom ${new Date(cb.chargeback_date).toLocaleDateString('de-DE')}`]
+      );
+      count++;
+    }
+    res.redirect(`/admin/finance?success=${count}+Mahngebühren+eingetragen#chargebacks`);
+  } catch (err) {
+    console.error(err);
+    res.redirect('/admin/finance?error=Fehler+beim+Eintragen');
+  }
+});
+
+// Einzelne Mahngebühr über Rückläufer-ID (membership_id wird aus chargeback geholt)
+router.post('/dunning/add-from-chargeback', requireAdmin, async (req, res) => {
+  const { chargeback_id, amount, issued_date, reason, notes } = req.body;
+  try {
+    const [cbs] = await db.query('SELECT * FROM chargebacks WHERE id = ?', [chargeback_id]);
+    if (cbs.length === 0) return res.redirect('/admin/finance?error=Rückläufer+nicht+gefunden');
+    await db.query(
+      'INSERT INTO dunning_fees (membership_id, amount, reason, issued_date, notes) VALUES (?,?,?,?,?)',
+      [cbs[0].membership_id, amount, reason || 'Mahngebühr Rücklastschrift', issued_date, notes || null]
+    );
+    res.redirect('/admin/finance?success=Mahngebühr+eingetragen');
+  } catch (err) {
+    res.redirect('/admin/finance?error=Fehler');
+  }
+});
+
+// ============================================
+// SEPA Nachforderung: offene Rückläufer + Mahngebühren
+// ============================================
+router.get('/chargebacks/sepa-export', requireAdmin, async (req, res) => {
+  try {
+    // Offene Rückläufer
+    const [chargebacks] = await db.query(`
+      SELECT c.*, m.first_name, m.last_name, m.iban, m.account_holder
+      FROM chargebacks c
+      JOIN memberships m ON c.membership_id = m.id
+      WHERE c.status = 'open'
+    `);
+
+    // Offene Mahngebühren
+    const [dunnings] = await db.query(`
+      SELECT d.*, m.first_name, m.last_name, m.iban, m.account_holder
+      FROM dunning_fees d
+      JOIN memberships m ON d.membership_id = m.id
+      WHERE d.status = 'open'
+    `);
+
+    if (chargebacks.length === 0 && dunnings.length === 0) {
+      return res.redirect('/admin/finance?error=Keine+offenen+Rückläufer+oder+Mahngebühren');
+    }
+
+    const today = new Date().toISOString().split('T')[0];
+    res.setHeader('Content-Type', 'text/csv; charset=utf-8');
+    res.setHeader('Content-Disposition', `attachment; filename="SEPA_Nachforderung_${today}.csv"`);
+    res.write('\uFEFF');
+    res.write('Name;IBAN;BIC;Betrag;Verwendungszweck;Mandatsreferenz;Mandatsdatum\n');
+
+    for (const c of chargebacks) {
+      const name = `${c.last_name} ${c.first_name}`.replace(/;/g, ' ');
+      const iban = (c.iban || '').replace(/\s/g, '');
+      const amount = Number(c.amount).toFixed(2).replace('.', ',');
+      const ref = `PF24-RL-${String(c.id).padStart(5,'0')}`;
+      res.write(`${name};${iban};;${amount};Nachforderung Rücklastschrift ${c.period};${ref};${today}\n`);
+    }
+
+    for (const d of dunnings) {
+      const name = `${d.last_name} ${d.first_name}`.replace(/;/g, ' ');
+      const iban = (d.iban || '').replace(/\s/g, '');
+      const amount = Number(d.amount).toFixed(2).replace('.', ',');
+      const ref = `PF24-MG-${String(d.id).padStart(5,'0')}`;
+      res.write(`${name};${iban};;${amount};${d.reason};${ref};${today}\n`);
+    }
+
+    res.end();
+  } catch (err) {
+    console.error(err);
+    res.redirect('/admin/finance?error=SEPA+Export+Fehler');
+  }
+});
+
 module.exports = router;
diff --git a/views/admin/finance.ejs b/views/admin/finance.ejs
index 76323fe..f519a2e 100644
--- a/views/admin/finance.ejs
+++ b/views/admin/finance.ejs
@@ -146,9 +146,11 @@
       <div class="finance-card">
         <div class="section-header">
           <h3>Rückläufer</h3>
-          <div style="display:flex;gap:8px">
+          <div style="display:flex;gap:8px;flex-wrap:wrap">
+            <button class="btn btn-warning btn-sm" onclick="toggleModal('allDunningModal')">📬 Alle mahnen</button>
             <button class="btn btn-outline btn-sm" onclick="toggleModal('addChargebackModal')">+ Manuell eintragen</button>
             <button class="btn btn-outline btn-sm" onclick="toggleModal('importChargebackModal')">📥 CSV Import</button>
+            <a href="/admin/finance/chargebacks/sepa-export" class="btn btn-primary btn-sm">📥 SEPA Nachforderung</a>
           </div>
         </div>
         <% if (chargebacks.length === 0) { %>
@@ -171,11 +173,17 @@
                     </span>
                   </td>
                   <td>
+                    <div style="display:flex;gap:6px;flex-wrap:wrap">
                     <% if (c.status === 'open') { %>
+                      <button class="btn btn-sm btn-warning"
+                        onclick="openDunningModal(<%= c.id %>, '<%= c.last_name %>, <%= c.first_name %>', <%= c.amount %>, '<%= c.period %>')">
+                        📬 Mahnen
+                      </button>
                       <form method="POST" action="/admin/finance/chargebacks/<%= c.id %>/resolve" style="display:inline">
                         <button type="submit" class="btn btn-sm btn-success">✅ Erledigt</button>
                       </form>
                     <% } %>
+                    </div>
                   </td>
                 </tr>
               <% }) %>
@@ -457,7 +465,89 @@
   </div>
 </div>
 
+<!-- Modal: Einzelne Mahngebühr für Rückläufer -->
+<div class="modal-overlay hidden" id="singleDunningModal">
+  <div class="modal">
+    <div class="modal-header">
+      <h3>Mahngebühr zuweisen</h3>
+      <button onclick="toggleModal('singleDunningModal')" class="modal-close">✕</button>
+    </div>
+    <form method="POST" action="/admin/finance/dunning/add-from-chargeback">
+      <input type="hidden" name="chargeback_id" id="dunning_membership_id">
+      <input type="hidden" name="invoice_id" value="">
+      <div class="form-group">
+        <label>Mitglied</label>
+        <input type="text" id="dunning_member_name" class="form-control" disabled>
+      </div>
+      <div class="form-row">
+        <div class="form-group">
+          <label>Mahngebühr (€) *</label>
+          <input type="number" name="amount" id="dunning_amount" step="0.01" min="0"
+                 class="form-control" required>
+        </div>
+        <div class="form-group">
+          <label>Datum *</label>
+          <input type="date" name="issued_date" class="form-control" required
+                 value="<%= new Date().toISOString().split('T')[0] %>">
+        </div>
+      </div>
+      <div class="form-group">
+        <label>Grund</label>
+        <input type="text" name="reason" class="form-control" value="Mahngebühr Rücklastschrift">
+      </div>
+      <div class="form-group">
+        <label>Notizen</label>
+        <textarea name="notes" class="form-control" rows="2"></textarea>
+      </div>
+      <div class="modal-footer">
+        <button type="button" onclick="toggleModal('singleDunningModal')" class="btn btn-outline">Abbrechen</button>
+        <button type="submit" class="btn btn-primary">📬 Mahngebühr eintragen</button>
+      </div>
+    </form>
+  </div>
+</div>
+
+<!-- Modal: Alle offenen Rückläufer mahnen -->
+<div class="modal-overlay hidden" id="allDunningModal">
+  <div class="modal">
+    <div class="modal-header">
+      <h3>Alle offenen Rückläufer mahnen</h3>
+      <button onclick="toggleModal('allDunningModal')" class="modal-close">✕</button>
+    </div>
+    <form method="POST" action="/admin/finance/chargebacks/dunning-all">
+      <p style="font-size:0.9rem;margin-bottom:16px;color:var(--text-muted)">
+        Trägt für alle offenen Rückläufer automatisch eine Mahngebühr ein.
+      </p>
+      <div class="form-row">
+        <div class="form-group">
+          <label>Mahngebühr pro Rückläufer (€) *</label>
+          <input type="number" name="amount" step="0.01" min="0"
+                 value="<%= Number(dunningFee).toFixed(2) %>" class="form-control" required>
+        </div>
+        <div class="form-group">
+          <label>Datum *</label>
+          <input type="date" name="issued_date" class="form-control" required
+                 value="<%= new Date().toISOString().split('T')[0] %>">
+        </div>
+      </div>
+      <div class="form-group">
+        <label>Grund</label>
+        <input type="text" name="reason" class="form-control" value="Mahngebühr Rücklastschrift">
+      </div>
+      <div class="modal-footer">
+        <button type="button" onclick="toggleModal('allDunningModal')" class="btn btn-outline">Abbrechen</button>
+        <button type="submit" class="btn btn-warning"
+                onclick="return confirm('Für alle offenen Rückläufer eine Mahngebühr eintragen?')">
+          📬 Alle mahnen
+        </button>
+      </div>
+    </form>
+  </div>
+</div>
+
+
 <script>
+const dunningDefaultFee = <%= Number(dunningFee).toFixed(2) %>;
 // Chart
 const ctx = document.getElementById('revenueChart').getContext('2d');
 const chartData = <%- JSON.stringify(monthlyRevenue) %>;
@@ -503,6 +593,15 @@ function showFileName(input) {
   const display = document.getElementById('fileNameDisplay');
   display.textContent = input.files.length > 0 ? input.files[0].name : 'Datei auswählen...';
 }
+
+function openDunningModal(chargebackId, memberName, amount, period) {
+  document.getElementById('dunning_member_name').value = memberName;
+  document.getElementById('dunning_amount').value = dunningDefaultFee;
+  // Set membership_id via chargeback - we pass it through a hidden field approach
+  // Store chargeback_id to look up membership on server
+  document.querySelector('#singleDunningModal input[name="membership_id"]').value = chargebackId;
+  toggleModal('singleDunningModal');
+}
 </script>
 </body>
 </html>