diff --git a/apps/web/src/app/(portal)/modules/tender-radar/components/SavedSearchBar.test.tsx b/apps/web/src/app/(portal)/modules/tender-radar/components/SavedSearchBar.test.tsx
index 0e95175..d2cbd71 100644
--- a/apps/web/src/app/(portal)/modules/tender-radar/components/SavedSearchBar.test.tsx
+++ b/apps/web/src/app/(portal)/modules/tender-radar/components/SavedSearchBar.test.tsx
@@ -49,7 +49,14 @@ afterEach(() => {
 describe('SavedSearchBar', () => {
   it('fetches on mount and renders each saved profile by name', async () => {
     mockListSavedSearches.mockResolvedValue([
-      { id: 'ss-1', name: 'Bau NRW', filters: { q: 'Bau' }, createdAt: '', updatedAt: '' },
+      {
+        id: 'ss-1',
+        name: 'Bau NRW',
+        filters: { q: 'Bau' },
+        instantAlert: false,
+        createdAt: '',
+        updatedAt: '',
+      },
     ]);
 
     const { SavedSearchBar } = await import('./SavedSearchBar');
@@ -81,6 +88,7 @@ describe('SavedSearchBar', () => {
       id: 'ss-new',
       name: 'Mein Profil',
       filters: {},
+      instantAlert: false,
       createdAt: '',
       updatedAt: '',
     });
@@ -136,6 +144,7 @@ describe('SavedSearchBar', () => {
         id: 'ss-1',
         name: 'Bau NRW',
         filters: { q: 'Bau', cpv: ['45', '71'], openOnly: 'false' },
+        instantAlert: false,
         createdAt: '',
         updatedAt: '',
       },
@@ -158,15 +167,16 @@ describe('SavedSearchBar', () => {
   it('renaming a profile calls updateSavedSearch(id, { name }) and reloads the list', async () => {
     mockListSavedSearches
       .mockResolvedValueOnce([
-        { id: 'ss-1', name: 'Alt', filters: {}, createdAt: '', updatedAt: '' },
+        { id: 'ss-1', name: 'Alt', filters: {}, instantAlert: false, createdAt: '', updatedAt: '' },
       ])
       .mockResolvedValueOnce([
-        { id: 'ss-1', name: 'Neu', filters: {}, createdAt: '', updatedAt: '' },
+        { id: 'ss-1', name: 'Neu', filters: {}, instantAlert: false, createdAt: '', updatedAt: '' },
       ]);
     mockUpdateSavedSearch.mockResolvedValue({
       id: 'ss-1',
       name: 'Neu',
       filters: {},
+      instantAlert: false,
       createdAt: '',
       updatedAt: '',
     });
@@ -192,7 +202,7 @@ describe('SavedSearchBar', () => {
   it('deleting a profile calls deleteSavedSearch(id) and reloads the list', async () => {
     mockListSavedSearches
       .mockResolvedValueOnce([
-        { id: 'ss-1', name: 'Weg damit', filters: {}, createdAt: '', updatedAt: '' },
+        { id: 'ss-1', name: 'Weg damit', filters: {}, instantAlert: false, createdAt: '', updatedAt: '' },
       ])
       .mockResolvedValueOnce([]);
     mockDeleteSavedSearch.mockResolvedValue(undefined);
@@ -208,4 +218,51 @@ describe('SavedSearchBar', () => {
       expect(screen.getByText(/Noch keine Suchprofile gespeichert/i)).toBeInTheDocument();
     });
   });
+
+  // --- Sofort-Alert toggle (Plan 12-04, NOTIFY-02, D-04) --------------------
+
+  it('renders the Sofort-Alert checkbox reflecting profile.instantAlert', async () => {
+    mockListSavedSearches.mockResolvedValue([
+      { id: 'ss-1', name: 'Bau NRW', filters: {}, instantAlert: true, createdAt: '', updatedAt: '' },
+      { id: 'ss-2', name: 'Straßenbau', filters: {}, instantAlert: false, createdAt: '', updatedAt: '' },
+    ]);
+
+    const { SavedSearchBar } = await import('./SavedSearchBar');
+    render(<SavedSearchBar />);
+
+    const onCheckbox = await screen.findByLabelText('Sofort-Alert für Bau NRW');
+    const offCheckbox = await screen.findByLabelText('Sofort-Alert für Straßenbau');
+
+    expect(onCheckbox).toBeChecked();
+    expect(offCheckbox).not.toBeChecked();
+  });
+
+  it('clicking the Sofort-Alert checkbox calls updateSavedSearch(id, { instantAlert: <negated> }) and reloads the list', async () => {
+    mockListSavedSearches
+      .mockResolvedValueOnce([
+        { id: 'ss-1', name: 'Bau NRW', filters: {}, instantAlert: false, createdAt: '', updatedAt: '' },
+      ])
+      .mockResolvedValueOnce([
+        { id: 'ss-1', name: 'Bau NRW', filters: {}, instantAlert: true, createdAt: '', updatedAt: '' },
+      ]);
+    mockUpdateSavedSearch.mockResolvedValue({
+      id: 'ss-1',
+      name: 'Bau NRW',
+      filters: {},
+      instantAlert: true,
+      createdAt: '',
+      updatedAt: '',
+    });
+
+    const { SavedSearchBar } = await import('./SavedSearchBar');
+    render(<SavedSearchBar />);
+
+    const checkbox = await screen.findByLabelText('Sofort-Alert für Bau NRW');
+    fireEvent.click(checkbox);
+
+    await waitFor(() => {
+      expect(mockUpdateSavedSearch).toHaveBeenCalledWith('ss-1', { instantAlert: true });
+    });
+    await waitFor(() => expect(mockListSavedSearches).toHaveBeenCalledTimes(2));
+  });
 });
diff --git a/apps/web/src/app/(portal)/modules/tender-radar/components/SavedSearchBar.tsx b/apps/web/src/app/(portal)/modules/tender-radar/components/SavedSearchBar.tsx
index 4e12cb1..e683418 100644
--- a/apps/web/src/app/(portal)/modules/tender-radar/components/SavedSearchBar.tsx
+++ b/apps/web/src/app/(portal)/modules/tender-radar/components/SavedSearchBar.tsx
@@ -30,6 +30,12 @@ import {
  * Per-user, NOT tenant-wide (D-11): the backend derives userId from the
  * auth cookie; this component never sends a userId.
  *
+ * Plan 12-04 (NOTIFY-02, D-04) adds a Sofort-Alert toggle per profile chip:
+ * a checkbox reflecting `profile.instantAlert` (default false) that calls
+ * updateSavedSearch(profile.id, { instantAlert: next }) on change. This is
+ * a profile field alongside name/filters, not a filter key — it never
+ * touches the URL searchParams filters contract above.
+ *
  * Hardcoded German strings — i18n rollout is Phase 14 (Research Open
  * Question 3, RESOLVED), same convention as FilterPanel/ResultsList.
  */
@@ -200,6 +206,20 @@ export function SavedSearchBar() {
     }
   };
 
+  const handleToggleInstantAlert = async (profile: SavedSearch) => {
+    setError(null);
+    try {
+      await updateSavedSearch(profile.id, { instantAlert: !profile.instantAlert });
+      await load();
+    } catch (err) {
+      setError(
+        err instanceof Error
+          ? err.message
+          : 'Sofort-Alert konnte nicht umgeschaltet werden.',
+      );
+    }
+  };
+
   return (
     <div className="rounded-lg border border-border bg-card p-4 shadow-sm space-y-3">
       <h2 className="text-sm font-semibold text-foreground">Suchprofile</h2>
@@ -281,6 +301,19 @@ export function SavedSearchBar() {
                   >
                     {profile.name}
                   </button>
+                  <label
+                    className="flex items-center gap-1 text-xs text-muted-foreground"
+                    title="Sofort-Alert per E-Mail bei neuen Treffern dieses Profils"
+                  >
+                    <input
+                      type="checkbox"
+                      aria-label={`Sofort-Alert für ${profile.name}`}
+                      checked={profile.instantAlert}
+                      onChange={() => handleToggleInstantAlert(profile)}
+                      className="h-3.5 w-3.5"
+                    />
+                    Sofort-Alert
+                  </label>
                   <button
                     type="button"
                     aria-label={`${profile.name} umbenennen`}
diff --git a/apps/web/src/app/(portal)/modules/tender-radar/settings/page.tsx b/apps/web/src/app/(portal)/modules/tender-radar/settings/page.tsx
index ebcf0f5..28e692a 100644
--- a/apps/web/src/app/(portal)/modules/tender-radar/settings/page.tsx
+++ b/apps/web/src/app/(portal)/modules/tender-radar/settings/page.tsx
@@ -1,5 +1,11 @@
 'use client';
 
+import { useEffect, useState } from 'react';
+import {
+  fetchNotificationPref,
+  saveNotificationPref,
+  type NotificationPref,
+} from '@/lib/tender-radar-api';
 import { SourceConfigForm } from './components/SourceConfigForm';
 
 /**
@@ -10,6 +16,14 @@ import { SourceConfigForm } from './components/SourceConfigForm';
  * requirement, driving the Plan 05 GET/PUT /modules/tender-radar/source-config
  * endpoint via SourceConfigForm.
  *
+ * Plan 12-04 (NOTIFY-01, D-01/D-03) adds a "Benachrichtigungen" section
+ * below: a Täglich/Wöchentlich/Aus selector for this user's digest interval
+ * preference, loaded via fetchNotificationPref on mount and saved via
+ * saveNotificationPref on change. Kept inline here (the page is already a
+ * 'use client' shell, unlike the admin-only SourceConfigForm split) rather
+ * than split into a separate component — this is a single select, no
+ * standalone unit-test coverage was called for in this plan.
+ *
  * No module-loader whitelist change is needed here: this is a standard
  * Next.js App Router route nested under the already-whitelisted
  * `tender-radar` module page (Plan 10-02).
@@ -19,12 +33,97 @@ import { SourceConfigForm } from './components/SourceConfigForm';
  * used by the tender-radar placeholder page.
  */
 export default function TenderRadarSettingsPage() {
+  const [digestInterval, setDigestInterval] = useState<
+    NotificationPref['digestInterval']
+  >('daily');
+  const [isLoading, setIsLoading] = useState(true);
+  const [isSaving, setIsSaving] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [saveSuccess, setSaveSuccess] = useState(false);
+
+  useEffect(() => {
+    fetchNotificationPref()
+      .then((pref) => setDigestInterval(pref.digestInterval))
+      .catch((err) => {
+        setError(
+          err instanceof Error
+            ? err.message
+            : 'Benachrichtigungseinstellung konnte nicht geladen werden',
+        );
+      })
+      .finally(() => setIsLoading(false));
+  }, []);
+
+  const handleChange = async (value: string) => {
+    const next = value as NotificationPref['digestInterval'];
+    setDigestInterval(next);
+    setError(null);
+    setSaveSuccess(false);
+    setIsSaving(true);
+    try {
+      const result = await saveNotificationPref(next);
+      setDigestInterval(result.digestInterval);
+      setSaveSuccess(true);
+    } catch (err) {
+      setError(
+        err instanceof Error
+          ? err.message
+          : 'Benachrichtigungseinstellung konnte nicht gespeichert werden',
+      );
+    } finally {
+      setIsSaving(false);
+    }
+  };
+
   return (
     <div className="mx-auto max-w-2xl p-6">
       <h1 className="text-2xl font-semibold tracking-tight mb-6">
         Ausschreibungs-Radar — Einstellungen
       </h1>
       <SourceConfigForm />
+
+      <div className="mt-8 border-t border-border pt-6">
+        <h2 className="text-lg font-semibold text-foreground mb-4">
+          Benachrichtigungen
+        </h2>
+
+        {isLoading ? (
+          <div className="h-9 max-w-xs rounded bg-muted animate-pulse" />
+        ) : (
+          <div>
+            <label
+              htmlFor="tr-digest-interval"
+              className="mb-1 block text-sm text-foreground"
+            >
+              Digest-Intervall
+            </label>
+            <select
+              id="tr-digest-interval"
+              value={digestInterval}
+              onChange={(e) => handleChange(e.target.value)}
+              disabled={isSaving}
+              className="h-9 max-w-xs rounded border border-border bg-background px-3 text-sm text-foreground"
+            >
+              <option value="daily">Täglich</option>
+              <option value="weekly">Wöchentlich</option>
+              <option value="off">Aus</option>
+            </select>
+            <p className="mt-1 text-xs text-muted-foreground">
+              Fasst neue Treffer aus Ihren Suchprofilen in einer täglichen
+              oder wöchentlichen Sammel-Mail zusammen. „Aus" deaktiviert den
+              Digest — Sofort-Alerts pro Suchprofil bleiben unabhängig davon
+              nutzbar.
+            </p>
+          </div>
+        )}
+
+        {saveSuccess && (
+          <p className="mt-2 text-sm" style={{ color: 'oklch(0.40 0.15 148)' }}>
+            Einstellung gespeichert.
+          </p>
+        )}
+        {error && <p className="mt-2 text-sm text-destructive">{error}</p>}
+      </div>
     </div>
   );
 }