diff --git a/backend/src/routes/storage.ts b/backend/src/routes/storage.ts
index 18159f9..5d78b52 100644
--- a/backend/src/routes/storage.ts
+++ b/backend/src/routes/storage.ts
@@ -105,7 +105,13 @@ storageRouter.delete(
 // MÜLL-KALENDER
 // ----------------------------------------------------------------------------
 
-const TRASH_SELECT = { id: true, type: true, date: true };
+const TRASH_SELECT = {
+  id: true,
+  type: true,
+  date: true,
+  completedAt: true,
+  completedBy: { select: { id: true, fullName: true } },
+};
 
 storageRouter.post(
   '/trash-schedule',
@@ -146,6 +152,26 @@ storageRouter.get('/trash-schedule', requireAuth, async (req: AuthedRequest, res
   res.status(200).json({ entries });
 });
 
+// Jeder Mieter (nicht nur der Vermieter) kann eine Mülltonne als
+// "rausgestellt" markieren — das ist eine gemeinschaftliche Aufgabe, keine
+// pro Person. Danach verschwindet die Erinnerung für alle.
+storageRouter.post(
+  '/trash-schedule/:id/complete',
+  requireAuth,
+  async (req: AuthedRequest, res: Response) => {
+    try {
+      const entry = await prisma.trashSchedule.update({
+        where: { id: req.params.id },
+        data: { completedAt: new Date(), completedById: req.user!.id },
+        select: TRASH_SELECT,
+      });
+      res.status(200).json({ entry });
+    } catch {
+      res.status(404).json({ error: 'Eintrag nicht gefunden' });
+    }
+  },
+);
+
 storageRouter.delete(
   '/trash-schedule/:id',
   requireAuth,
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 31af41d..301dc02 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -189,6 +189,7 @@ model User {
   accessCodeAssigned  AccessCode[]     @relation("AccessCodeUser")
   accessCodesGiven    AccessCode[]     @relation("AccessCodeAssignedBy")
   announcementsMade   Announcement[]
+  trashCompleted      TrashSchedule[]
   notifications       Notification[]
   invitationsSent     Invitation[]     @relation("InvitationsSent")
   storageSlots        StorageSlot[]
@@ -640,6 +641,13 @@ model TrashSchedule {
   date           DateTime
   reminderSentAt DateTime? @map("reminder_sent_at")
 
+  // Wird gesetzt, sobald irgendein Mieter die Tonne rausgestellt hat — dann
+  // verschwindet die Erinnerung für ALLE Mieter (gemeinschaftliche Aufgabe,
+  // keine Erledigung pro Person).
+  completedAt   DateTime? @map("completed_at")
+  completedById String?   @map("completed_by_id")
+  completedBy   User?     @relation(fields: [completedById], references: [id])
+
   createdAt DateTime @default(now()) @map("created_at")
 
   @@unique([type, date])
diff --git a/web-dashboard/index.html b/web-dashboard/index.html
index 0e4a005..4ab64f6 100644
--- a/web-dashboard/index.html
+++ b/web-dashboard/index.html
@@ -3283,8 +3283,14 @@
       const from = today.toISOString().slice(0, 10);
       const to = weekAhead.toISOString().slice(0, 10);
       const data = await apiFetch(`/trash-schedule?from=${from}&to=${to}`);
-      data.entries.forEach(e => {
-        items.push({ date: new Date(e.date), icon: '🗑️', text: `Müll rausstellen: ${TRASH_TYPE_LABEL[e.type] || e.type} am ${new Date(e.date).toLocaleDateString('de-DE')}` });
+      data.entries.filter(e => !e.completedAt).forEach(e => {
+        items.push({
+          date: new Date(e.date),
+          icon: '🗑️',
+          text: `Müll rausstellen: ${TRASH_TYPE_LABEL[e.type] || e.type} am ${new Date(e.date).toLocaleDateString('de-DE')}`,
+          actionLabel: 'Erledigt',
+          onAction: () => completeTrashEntry(e.id),
+        });
       });
     } catch (err) {
       console.error('[notifications] Müllkalender laden fehlgeschlagen:', err.message);
@@ -3316,10 +3322,26 @@
     items.forEach(item => {
       const row = el('div', 'ticket-row');
       row.appendChild(el('div', 'title', `${item.icon} ${item.text}`));
+      if (item.onAction) {
+        const btn = document.createElement('button');
+        btn.className = 'btn-secondary';
+        btn.textContent = item.actionLabel;
+        btn.onclick = item.onAction;
+        row.appendChild(btn);
+      }
       list.appendChild(row);
     });
   }
 
+  async function completeTrashEntry(id) {
+    try {
+      await apiFetch(`/trash-schedule/${id}/complete`, { method: 'POST' });
+      loadNotifications();
+    } catch (err) {
+      alert(err.message);
+    }
+  }
+
   function buildProfileCompletenessBadge(user) {
     const missing = [];
     if (!user.phoneNumber) missing.push('Telefonnummer');