diff --git a/frontend/src/views/CalendarView.vue b/frontend/src/views/CalendarView.vue
index 011abac..0590e43 100644
--- a/frontend/src/views/CalendarView.vue
+++ b/frontend/src/views/CalendarView.vue
@@ -9,7 +9,8 @@
         <input ref="calImportInput" type="file" accept=".ics,.ical,.csv" hidden @change="onCalImportFile" />
         <Button icon="pi pi-download" label="Export" size="small" outlined
                 :disabled="!exportableCalendars.length" @click="showCalExportDialog = true" />
-        <Button icon="pi pi-plus" label="Neuer Termin" size="small" @click="openNewEvent()" />
+        <Button icon="pi pi-plus" label="Neuer Termin" size="small"
+                :disabled="!writableCalendars.length" @click="openNewEvent()" />
       </div>
     </div>
 
@@ -118,7 +119,7 @@
     <Dialog v-model:visible="showCalImportDialog" header="In welchen Kalender importieren?" modal :style="{ width: '420px' }">
       <div class="field">
         <label>Kalender</label>
-        <Select v-model="importTargetCalId" :options="ownCalendars" optionLabel="name" optionValue="id" fluid />
+        <Select v-model="importTargetCalId" :options="writableCalendars" optionLabel="name" optionValue="id" fluid />
       </div>
       <p class="hint" style="font-size:0.85rem;color:var(--p-text-muted-color)">Datei: {{ pendingImportFile?.name }}</p>
       <template #footer>
@@ -168,9 +169,9 @@
         <label>Titel</label>
         <InputText v-model="eventForm.summary" fluid autofocus />
       </div>
-      <div class="field">
+      <div v-if="writableCalendars.length > 1" class="field">
         <label>Kalender</label>
-        <Select v-model="eventForm.calendar_id" :options="ownCalendars" optionLabel="name" optionValue="id" fluid />
+        <Select v-model="eventForm.calendar_id" :options="writableCalendars" optionLabel="name" optionValue="id" fluid />
       </div>
       <div class="field-row">
         <div class="field">
@@ -616,6 +617,10 @@ const currentEditScope = ref(null)
 const permOptions = [{ label: 'Lesen', value: 'read' }, { label: 'Lesen+Schreiben', value: 'readwrite' }]
 
 const ownCalendars = computed(() => calendars.value.filter(c => c.permission === 'owner'))
+// Beschreibbar = eigener Kalender ODER Freigabe mit Schreibrecht.
+const writableCalendars = computed(() =>
+  calendars.value.filter(c => c.permission === 'owner' || c.permission === 'readwrite')
+)
 const exportableCalendars = computed(() => calendars.value)
 
 // --- Calendar Import / Export ---
@@ -638,8 +643,8 @@ watch(showCalExportDialog, (v) => {
 })
 
 function triggerCalImport() {
-  if (!ownCalendars.value.length) {
-    toast.add({ severity: 'warn', summary: 'Kein eigener Kalender', life: 3000 })
+  if (!writableCalendars.value.length) {
+    toast.add({ severity: 'warn', summary: 'Kein beschreibbarer Kalender', life: 3000 })
     return
   }
   calImportInput.value?.click()
@@ -650,7 +655,7 @@ function onCalImportFile(ev) {
   ev.target.value = ''
   if (!file) return
   pendingImportFile.value = file
-  importTargetCalId.value = ownCalendars.value[0]?.id
+  importTargetCalId.value = writableCalendars.value[0]?.id
   showCalImportDialog.value = true
 }
 
@@ -969,6 +974,10 @@ async function createCalendar() {
 }
 
 function openNewEvent(start, end, allDay = false) {
+  if (!writableCalendars.value.length) {
+    toast.add({ severity: 'warn', summary: 'Kein beschreibbarer Kalender vorhanden', life: 3000 })
+    return
+  }
   editingEvent.value = null
   const now = start || new Date()
   const later = end || new Date(now.getTime() + 3600000)
@@ -976,7 +985,7 @@ function openNewEvent(start, end, allDay = false) {
     summary: '',
     description: '',
     location: '',
-    calendar_id: ownCalendars.value[0]?.id,
+    calendar_id: writableCalendars.value[0].id,
     dtstart: toLocalISO(now, allDay),
     dtend: toLocalISO(later, allDay),
     all_day: allDay,
diff --git a/frontend/src/views/ContactsView.vue b/frontend/src/views/ContactsView.vue
index 7a699fc..f8b509f 100644
--- a/frontend/src/views/ContactsView.vue
+++ b/frontend/src/views/ContactsView.vue
@@ -8,7 +8,8 @@
         <input ref="importInput" type="file" accept=".vcf,.vcard,.csv" hidden @change="onImportFile" />
         <Button icon="pi pi-download" label="Export" size="small" outlined
                 :disabled="!selectedBookId" @click="showExportDialog = true" />
-        <Button icon="pi pi-user-plus" label="Neuer Kontakt" size="small" @click="openNewContact" />
+        <Button icon="pi pi-user-plus" label="Neuer Kontakt" size="small"
+                :disabled="!writableBooks.length" @click="openNewContact" />
       </div>
     </div>
 
@@ -179,6 +180,11 @@
         </TabList>
         <TabPanels>
           <TabPanel value="general">
+            <div v-if="writableBooks.length > 1" class="field" style="max-width:400px">
+              <label>Adressbuch</label>
+              <Select v-model="contactTargetBookId" :options="writableBooks"
+                      optionLabel="name" optionValue="id" fluid />
+            </div>
             <div class="photo-row">
               <div class="avatar large" :style="{ background: avatarColor(contactForm) }">
                 <img v-if="contactForm.photo" :src="contactForm.photo" />
@@ -391,6 +397,10 @@ const auth = useAuthStore()
 const addressBooks = ref([])
 const contacts = ref([])
 const selectedBookId = ref(null)
+const contactTargetBookId = ref(null)
+const writableBooks = computed(() =>
+  addressBooks.value.filter(b => b.permission === 'owner' || b.permission === 'readwrite')
+)
 const loading = ref(false)
 const searchQuery = ref('')
 let searchTimer = null
@@ -615,10 +625,17 @@ function copyText(t) {
 }
 
 function openNewContact() {
+  if (!writableBooks.value.length) {
+    toast.add({ severity: 'warn', summary: 'Kein beschreibbares Adressbuch vorhanden', life: 3000 })
+    return
+  }
   editingContactId.value = null
   Object.assign(contactForm, emptyContact())
   categoriesString.value = ''
   activeTab.value = 'general'
+  // Default: aktuell markiertes Buch, falls beschreibbar, sonst erstes beschreibbares
+  const selectedBook = writableBooks.value.find(b => b.id === selectedBookId.value)
+  contactTargetBookId.value = selectedBook ? selectedBook.id : writableBooks.value[0].id
   showContactDialog.value = true
 }
 
@@ -685,7 +702,12 @@ async function saveContact() {
     if (editingContactId.value) {
       await apiClient.put(`/contacts/${editingContactId.value}`, payload)
     } else {
-      await apiClient.post(`/addressbooks/${selectedBookId.value}/contacts`, payload)
+      const target = contactTargetBookId.value || selectedBookId.value
+      if (!target) {
+        toast.add({ severity: 'error', summary: 'Bitte Adressbuch waehlen', life: 3000 })
+        return
+      }
+      await apiClient.post(`/addressbooks/${target}/contacts`, payload)
     }
     showContactDialog.value = false
     await loadBooks()
diff --git a/frontend/src/views/TasksView.vue b/frontend/src/views/TasksView.vue
index f5ad477..bf04431 100644
--- a/frontend/src/views/TasksView.vue
+++ b/frontend/src/views/TasksView.vue
@@ -9,7 +9,7 @@
         <Button icon="pi pi-download" label="Export" size="small" outlined
                 :disabled="!selectedListId" @click="showExportDialog = true" />
         <Button icon="pi pi-plus" label="Neue Aufgabe" size="small"
-                :disabled="!selectedListId" @click="openNewTask" />
+                :disabled="!writableLists.length" @click="openNewTask" />
       </div>
     </div>
 
@@ -166,6 +166,11 @@
     <!-- Task Dialog -->
     <Dialog v-model:visible="showTaskDialog" :header="editingTaskId ? 'Aufgabe bearbeiten' : 'Neue Aufgabe'"
             modal :style="{ width: '560px' }">
+      <div v-if="writableLists.length > 1" class="field">
+        <label>Liste</label>
+        <Select v-model="taskTargetListId" :options="writableLists"
+                optionLabel="name" optionValue="id" fluid />
+      </div>
       <div class="field">
         <label>Titel</label>
         <InputText v-model="taskForm.summary" fluid autofocus />
@@ -247,6 +252,10 @@ const username = computed(() => auth.user?.username || '')
 
 const lists = ref([])
 const selectedListId = ref(null)
+const taskTargetListId = ref(null)
+const writableLists = computed(() =>
+  lists.value.filter(l => l.permission === 'owner' || l.permission === 'readwrite')
+)
 const tasks = ref([])
 const search = ref('')
 const hideDone = ref(false)
@@ -464,12 +473,19 @@ async function deleteList() {
 }
 
 function openNewTask() {
+  if (!writableLists.value.length) {
+    toast.add({ severity: 'warn', summary: 'Keine beschreibbare Liste', life: 3000 })
+    return
+  }
   editingTaskId.value = null
   Object.assign(taskForm, {
     summary: '', description: '', due: '',
     status: 'NEEDS-ACTION', priority: null, percent_complete: null,
     categories: '',
   })
+  // Default-Liste: aktuell markierte falls beschreibbar, sonst erste beschreibbare
+  const sel = writableLists.value.find(l => l.id === selectedListId.value)
+  taskTargetListId.value = sel ? sel.id : writableLists.value[0].id
   showTaskDialog.value = true
 }
 
@@ -502,7 +518,12 @@ async function saveTask() {
     if (editingTaskId.value) {
       await apiClient.put(`/tasks/${editingTaskId.value}`, payload)
     } else {
-      await apiClient.post(`/tasklists/${selectedListId.value}/tasks`, payload)
+      const target = taskTargetListId.value || selectedListId.value
+      if (!target) {
+        toast.add({ severity: 'error', summary: 'Bitte Liste waehlen', life: 3000 })
+        return
+      }
+      await apiClient.post(`/tasklists/${target}/tasks`, payload)
     }
     showTaskDialog.value = false
     await loadLists()