diff --git a/web-app/src/assets/main.css b/web-app/src/assets/main.css
index 8317281..13d9690 100644
--- a/web-app/src/assets/main.css
+++ b/web-app/src/assets/main.css
@@ -61,3 +61,15 @@ a:hover {
   border: 2px solid var(--theme-secondary);
   padding: 0.1rem 0.25rem;
 }
+
+/* An alert banner, usually using <p>, to present some highlighted info. */
+.alert-banner {
+  background-color: var(--bg-lighter);
+  padding: 0.5rem;
+  border-radius: 0.5rem;
+}
+
+.alert-banner-warning {
+  background-color: var(--warning);
+  color: var(--bg);
+}
diff --git a/web-app/src/components/IdleTimeoutModal.vue b/web-app/src/components/IdleTimeoutModal.vue
index 1874a8f..111c5d5 100644
--- a/web-app/src/components/IdleTimeoutModal.vue
+++ b/web-app/src/components/IdleTimeoutModal.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { useAuthStore } from '@/stores/auth-store'
+import { LogoutReason, useAuthStore } from '@/stores/auth-store'
 import { useTemplateRef, ref, computed } from 'vue'
 import ModalWrapper from './common/ModalWrapper.vue'
 import AppButton from './common/AppButton.vue'
@@ -23,7 +23,7 @@ function start() {
   timeoutTimerId.value = window.setInterval(() => {
     secondsUntilLogout.value = secondsUntilLogout.value - 1
     if (secondsUntilLogout.value <= 0) {
-      authStore.onUserLoggedOut()
+      authStore.onUserLoggedOut(LogoutReason.INACTIVITY_TIMEOUT)
       window.clearInterval(timeoutTimerId.value)
     }
   }, 1000)
diff --git a/web-app/src/pages/LoginPage.vue b/web-app/src/pages/LoginPage.vue
index 3d37e98..762bea7 100644
--- a/web-app/src/pages/LoginPage.vue
+++ b/web-app/src/pages/LoginPage.vue
@@ -6,7 +6,7 @@ import AppButton from '@/components/common/AppButton.vue'
 import AppForm from '@/components/common/form/AppForm.vue'
 import FormControl from '@/components/common/form/FormControl.vue'
 import FormGroup from '@/components/common/form/FormGroup.vue'
-import { useAuthStore } from '@/stores/auth-store'
+import { LogoutReason, useAuthStore } from '@/stores/auth-store'
 import { showAlert } from '@/util/alert'
 import { hideLoader, showLoader } from '@/util/loader'
 import { ref } from 'vue'
@@ -89,6 +89,22 @@ function generateSampleData() {
     <p style="text-align: center; font-weight: 600; margin-top: 0">
       <em>Personal finance for the modern era.</em>
     </p>
+
+    <p
+      v-if="authStore.logoutReason === LogoutReason.INACTIVITY_TIMEOUT"
+      class="alert-banner alert-banner-warning"
+    >
+      You were logged out automatically after being inactive for a while. Please log in again to
+      resume your session.
+    </p>
+
+    <p
+      v-if="authStore.logoutReason === LogoutReason.TOKEN_EXPIRED"
+      class="alert-banner alert-banner-warning"
+    >
+      You were logged out because your session expired. Please log in again to resume your session.
+    </p>
+
     <AppForm @submit="doLogin()">
       <FormGroup>
         <FormControl
diff --git a/web-app/src/pages/UserAccountLayout.vue b/web-app/src/pages/UserAccountLayout.vue
index 7973ceb..4f4ef4b 100644
--- a/web-app/src/pages/UserAccountLayout.vue
+++ b/web-app/src/pages/UserAccountLayout.vue
@@ -8,7 +8,7 @@ import { AuthApiClient } from '@/api/auth'
 import { getSelectedProfile } from '@/api/profile'
 import { secondsUntilExpired } from '@/api/token-util'
 import IdleTimeoutModal from '@/components/IdleTimeoutModal.vue'
-import { useAuthStore } from '@/stores/auth-store'
+import { LogoutReason, useAuthStore } from '@/stores/auth-store'
 import { useIdleObserver } from '@idle-observer/vue3'
 import { onMounted, ref, useTemplateRef, type Ref } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
@@ -17,7 +17,7 @@ const route = useRoute()
 const router = useRouter()
 const authStore = useAuthStore()
 
-const IDLE_TIMEOUT_SECONDS = 300
+const IDLE_TIMEOUT_SECONDS = 10
 const idleTimeoutModal = useTemplateRef('idleTimeoutModal')
 useIdleObserver({
   timeout: IDLE_TIMEOUT_SECONDS * 1000,
@@ -61,7 +61,7 @@ async function checkAuth() {
       console.warn('Failed to refresh token.', err)
     }
   } else if (secondsUntilExpiration <= 0) {
-    authStore.onUserLoggedOut()
+    authStore.onUserLoggedOut(LogoutReason.TOKEN_EXPIRED)
   }
 }
 </script>
@@ -87,7 +87,7 @@ async function checkAuth() {
 
         <span
           class="app-logout-button"
-          @click="authStore.onUserLoggedOut()"
+          @click="authStore.onUserLoggedOut(LogoutReason.USER_LOGGED_OUT)"
         >
           <font-awesome-icon icon="fa-solid fa-arrow-right-from-bracket"></font-awesome-icon>
         </span>
diff --git a/web-app/src/stores/auth-store.ts b/web-app/src/stores/auth-store.ts
index 541963c..5394f46 100644
--- a/web-app/src/stores/auth-store.ts
+++ b/web-app/src/stores/auth-store.ts
@@ -9,20 +9,31 @@ export interface AuthenticatedData {
 
 const LOCAL_STORAGE_KEY = 'token'
 
+export enum LogoutReason {
+  USER_LOGGED_OUT,
+  INACTIVITY_TIMEOUT,
+  TOKEN_EXPIRED,
+}
+
 export const useAuthStore = defineStore('auth', () => {
+  console.log('Initializing authStore')
+
   const state: Ref<AuthenticatedData | null> = ref(getStateFromLocalStorage())
+  const logoutReason: Ref<LogoutReason | null> = ref(null)
 
   function onUserLoggedIn(username: string, token: string) {
     state.value = { username, token }
+    logoutReason.value = null
     localStorage.setItem(LOCAL_STORAGE_KEY, token)
   }
 
-  function onUserLoggedOut() {
+  function onUserLoggedOut(reason: LogoutReason) {
     state.value = null
+    logoutReason.value = reason
     localStorage.removeItem(LOCAL_STORAGE_KEY)
   }
 
-  return { state, onUserLoggedIn, onUserLoggedOut }
+  return { state, logoutReason, onUserLoggedIn, onUserLoggedOut }
 })
 
 function getStateFromLocalStorage(): AuthenticatedData | null {
@@ -32,6 +43,5 @@ function getStateFromLocalStorage(): AuthenticatedData | null {
     return null
   }
   const username = parseSubject(token)
-  console.info('Loaded authentication information for user', username)
   return { username, token }
 }