diff --git a/src/main/ipc/inboxApi.ts b/src/main/ipc/inboxApi.ts
index c83e73e..475d38e 100644
--- a/src/main/ipc/inboxApi.ts
+++ b/src/main/ipc/inboxApi.ts
@@ -102,6 +102,31 @@ export function registerInboxApi(deps: InboxIpcDeps): void {
   );
 
   ipcMain.handle('inbox:trashCount', () => deps.repo.countTrashed());
+
+  ipcMain.handle('inbox:listExpired', async () => deps.capture.listExpired());
+
+  ipcMain.handle(
+    'inbox:trashExpiredBatch',
+    async (_e, payload: { ids: string[] }) => {
+      if (payload.ids.length === 0) return { trashedCount: 0, confirmed: false };
+      const win = deps.getInboxWindow();
+      const opts: Electron.MessageBoxOptions = {
+        type: 'question',
+        buttons: ['옮기기', '취소'],
+        defaultId: 1,
+        cancelId: 1,
+        title: 'Inkling',
+        message: `선택한 노트 ${payload.ids.length}개를 휴지통으로 옮깁니다`,
+        detail: '복구는 휴지통 탭에서 가능합니다.'
+      };
+      const r = win
+        ? await dialog.showMessageBox(win, opts)
+        : await dialog.showMessageBox(opts);
+      if (r.response !== 0) return { trashedCount: 0, confirmed: false };
+      const result = await deps.capture.trashExpiredBatch(payload.ids);
+      return { trashedCount: result.trashedCount, confirmed: true };
+    }
+  );
 }
 
 export function pushNoteUpdated(getWin: () => BrowserWindow | null, note: Note): void {
diff --git a/src/main/services/CaptureService.ts b/src/main/services/CaptureService.ts
index 63e0b76..8563f3f 100644
--- a/src/main/services/CaptureService.ts
+++ b/src/main/services/CaptureService.ts
@@ -1,5 +1,6 @@
 import type { NoteRepository } from '../repository/NoteRepository.js';
 import type { MediaStore } from './MediaStore.js';
+import type { Note } from '@shared/types';
 
 export interface TelemetryEmitter {
   emit(input:
@@ -8,6 +9,8 @@ export interface TelemetryEmitter {
     | { kind: 'restore'; payload: { noteId: string } }
     | { kind: 'permanent_delete'; payload: { noteId: string } }
     | { kind: 'empty_trash'; payload: { count: number } }
+    | { kind: 'expired_banner_shown'; payload: { candidateCount: number } }
+    | { kind: 'expired_batch_trash'; payload: { count: number } }
   ): Promise<void>;
 }
 
@@ -23,6 +26,8 @@ export interface SubmitInput {
 }
 
 export class CaptureService {
+  private lastExpiredShownSig: string | null = null;
+
   constructor(
     private repo: NoteRepository,
     private store: MediaStore,
@@ -111,4 +116,45 @@ export class CaptureService {
     }
     return { count: noteIds.length };
   }
+
+  /**
+   * 만료 후보 (due_date < today KST, active, ai_status=done) 조회.
+   * candidates 가 비지 않고 signature 가 직전과 다르면 expired_banner_shown 자동 emit.
+   * v0.2.3 #5 spec §6.2 — dedup 위치 main 통합.
+   */
+  async listExpired(now: Date = new Date()): Promise<Note[]> {
+    const candidates = this.repo.findExpiredCandidates(now);
+    if (candidates.length === 0) {
+      this.lastExpiredShownSig = null;
+      return candidates;
+    }
+    const sig = `${candidates.length}:${candidates.slice(0, 3).map((n) => n.id).join('-')}`;
+    if (sig !== this.lastExpiredShownSig) {
+      this.lastExpiredShownSig = sig;
+      if (this.deps.telemetry) {
+        await this.deps.telemetry.emit({
+          kind: 'expired_banner_shown',
+          payload: { candidateCount: candidates.length }
+        }).catch(() => {});
+      }
+    }
+    return candidates;
+  }
+
+  /**
+   * 만료 후보 일괄 trash. 빈 배열은 즉시 no-op.
+   * 성공 시 expired_batch_trash 1회 emit (per-id trash emit 은 별도 발화 안 함 —
+   * stats.md 에서 `trash` (단건) vs `expired_batch_trash` (배치) 분리 통계).
+   */
+  async trashExpiredBatch(ids: string[]): Promise<{ trashedCount: number }> {
+    if (ids.length === 0) return { trashedCount: 0 };
+    const r = this.repo.trashBatch(ids, new Date().toISOString());
+    if (this.deps.telemetry) {
+      await this.deps.telemetry.emit({
+        kind: 'expired_batch_trash',
+        payload: { count: r.trashedCount }
+      }).catch(() => {});
+    }
+    return r;
+  }
 }
diff --git a/src/preload/index.ts b/src/preload/index.ts
index 7111851..7a35600 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -25,6 +25,8 @@ const api: InklingApi = {
     emptyTrash: () => ipcRenderer.invoke('inbox:emptyTrash'),
     listTrash: (opts) => ipcRenderer.invoke('inbox:listTrash', opts),
     getTrashCount: () => ipcRenderer.invoke('inbox:trashCount'),
+    listExpired: () => ipcRenderer.invoke('inbox:listExpired'),
+    trashExpiredBatch: (ids) => ipcRenderer.invoke('inbox:trashExpiredBatch', { ids }),
     onNoteUpdated: (cb) => {
       const listener = (_e: unknown, note: Note) => cb(note);
       ipcRenderer.on('note:updated', listener);
diff --git a/src/shared/types.ts b/src/shared/types.ts
index e0b0179..33cca70 100644
--- a/src/shared/types.ts
+++ b/src/shared/types.ts
@@ -77,6 +77,8 @@ export interface InboxApi {
   emptyTrash(): Promise<{ confirmed: boolean; count: number }>;
   listTrash(opts: { limit: number }): Promise<Note[]>;
   getTrashCount(): Promise<number>;
+  listExpired(): Promise<Note[]>;
+  trashExpiredBatch(ids: string[]): Promise<{ trashedCount: number; confirmed: boolean }>;
   onNoteUpdated(cb: (note: Note) => void): () => void;
 }
 
diff --git a/tests/unit/CaptureService.test.ts b/tests/unit/CaptureService.test.ts
index fefcd0a..3760d53 100644
--- a/tests/unit/CaptureService.test.ts
+++ b/tests/unit/CaptureService.test.ts
@@ -208,3 +208,118 @@ describe('CaptureService trash flow (v0.2.3 #4)', () => {
     expect(r.count).toBe(0);
   });
 });
+
+describe('CaptureService.listExpired (dedup signature)', () => {
+  let db: Database.Database;
+  let repo: NoteRepository;
+  let store: MediaStore;
+  let tmp: string;
+  let calls: Array<{ kind: string; payload: any }>;
+  let svc: CaptureService;
+
+  function addExpired(id: string, dueDate: string, createdAt: string = '2026-04-30T10:00:00Z'): void {
+    db.prepare(
+      `INSERT INTO notes
+         (id, raw_text, ai_status, due_date, created_at, updated_at)
+       VALUES (?, ?, 'done', ?, ?, ?)`
+    ).run(id, id, dueDate, createdAt, createdAt);
+  }
+
+  beforeEach(() => {
+    db = new Database(':memory:');
+    runMigrations(db);
+    repo = new NoteRepository(db);
+    tmp = mkdtempSync(join(tmpdir(), 'inkling-capture-'));
+    store = new MediaStore(tmp);
+    calls = [];
+    svc = new CaptureService(repo, store, {
+      enqueue: async () => {},
+      celebrate: () => {},
+      telemetry: { emit: async (input) => { calls.push(input as any); } }
+    });
+  });
+
+  it('emits expired_banner_shown on first call when candidates > 0', async () => {
+    addExpired('n1', '2026-04-20', '2026-04-30T10:00:00Z');
+    addExpired('n2', '2026-04-22', '2026-04-30T11:00:00Z');
+    const r = await svc.listExpired(new Date('2026-05-01T12:00:00Z'));
+    expect(r).toHaveLength(2);
+    expect(calls).toContainEqual(
+      expect.objectContaining({ kind: 'expired_banner_shown', payload: { candidateCount: 2 } })
+    );
+  });
+
+  it('does NOT re-emit on second call with identical candidate set (dedup)', async () => {
+    addExpired('n1', '2026-04-20', '2026-04-30T10:00:00Z');
+    addExpired('n2', '2026-04-22', '2026-04-30T11:00:00Z');
+    await svc.listExpired(new Date('2026-05-01T12:00:00Z'));
+    await svc.listExpired(new Date('2026-05-01T12:00:00Z'));
+    const showns = calls.filter((c) => c.kind === 'expired_banner_shown');
+    expect(showns).toHaveLength(1);
+  });
+
+  it('re-emits when candidate set changes (count or first-3-ids)', async () => {
+    addExpired('n1', '2026-04-20', '2026-04-30T10:00:00Z');
+    addExpired('n2', '2026-04-22', '2026-04-30T11:00:00Z');
+    await svc.listExpired(new Date('2026-05-01T12:00:00Z'));
+    addExpired('n3', '2026-04-23', '2026-04-30T12:00:00Z');
+    await svc.listExpired(new Date('2026-05-01T12:00:00Z'));
+    const showns = calls.filter((c) => c.kind === 'expired_banner_shown');
+    expect(showns).toHaveLength(2);
+    expect(showns[1]!.payload).toMatchObject({ candidateCount: 3 });
+  });
+
+  it('does NOT emit when candidates is empty', async () => {
+    const r = await svc.listExpired(new Date('2026-05-01T12:00:00Z'));
+    expect(r).toEqual([]);
+    expect(calls.filter((c) => c.kind === 'expired_banner_shown')).toEqual([]);
+  });
+});
+
+describe('CaptureService.trashExpiredBatch', () => {
+  let db: Database.Database;
+  let repo: NoteRepository;
+  let store: MediaStore;
+  let tmp: string;
+  let calls: Array<{ kind: string; payload: any }>;
+  let svc: CaptureService;
+
+  function addExpired(id: string, dueDate: string): void {
+    db.prepare(
+      `INSERT INTO notes
+         (id, raw_text, ai_status, due_date, created_at, updated_at)
+       VALUES (?, ?, 'done', ?, ?, ?)`
+    ).run(id, id, dueDate, '2026-04-30T10:00:00Z', '2026-04-30T10:00:00Z');
+  }
+
+  beforeEach(() => {
+    db = new Database(':memory:');
+    runMigrations(db);
+    repo = new NoteRepository(db);
+    tmp = mkdtempSync(join(tmpdir(), 'inkling-capture-'));
+    store = new MediaStore(tmp);
+    calls = [];
+    svc = new CaptureService(repo, store, {
+      enqueue: async () => {},
+      celebrate: () => {},
+      telemetry: { emit: async (input) => { calls.push(input as any); } }
+    });
+  });
+
+  it('emits expired_batch_trash with trashedCount + no per-id trash emit', async () => {
+    addExpired('n1', '2026-04-20');
+    addExpired('n2', '2026-04-22');
+    const r = await svc.trashExpiredBatch(['n1', 'n2']);
+    expect(r.trashedCount).toBe(2);
+    expect(calls.filter((c) => c.kind === 'expired_batch_trash')).toEqual([
+      expect.objectContaining({ kind: 'expired_batch_trash', payload: { count: 2 } })
+    ]);
+    expect(calls.filter((c) => c.kind === 'trash')).toEqual([]);
+  });
+
+  it('returns trashedCount=0 for empty array (no emit)', async () => {
+    const r = await svc.trashExpiredBatch([]);
+    expect(r.trashedCount).toBe(0);
+    expect(calls.filter((c) => c.kind === 'expired_batch_trash')).toEqual([]);
+  });
+});