diff --git a/README.md b/README.md
index 5f5d562..9e94b46 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 # MixedAssets
 
-MixedAssets is a fixed asset management and depreciation SPA for small and mid-sized organizations. This first build includes an Express API, Vue/Vuetify frontend, SQLite persistence, role-aware login, asset register, templates, JSON tax-rule sets, depreciation reports, import/export, file storage scaffolding, and admin configuration.
+MixedAssets is a fixed asset management and depreciation SPA for small and mid-sized organizations. This build includes an Express API, Vue/Vuetify frontend, SQLite persistence, role-aware login, asset register, templates, JSON tax-rule sets, depreciation reports, import/export, and admin configuration.
+
+Each asset carries six independent books (GAAP, Federal, State, AMT, ACE, User-defined), each with its own cost, depreciation method, useful life, §179 amount, bonus percentage, and convention. The asset workbench also includes a File Cabinet (invoices, photos, manuals), warranty/service-agreement tracking, a per-asset task list, and a running notes timeline.
 
 ## Run
 
diff --git a/server/db.js b/server/db.js
index 281ae3d..184d1f6 100644
--- a/server/db.js
+++ b/server/db.js
@@ -327,6 +327,14 @@ function initialize() {
       updated_at TEXT NOT NULL
     );
 
+    CREATE TABLE IF NOT EXISTS asset_notes (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      asset_id INTEGER NOT NULL REFERENCES assets(id) ON DELETE CASCADE,
+      body TEXT NOT NULL,
+      created_by INTEGER REFERENCES users(id),
+      created_at TEXT NOT NULL
+    );
+
     CREATE TABLE IF NOT EXISTS audit_logs (
       id INTEGER PRIMARY KEY AUTOINCREMENT,
       actor_id INTEGER REFERENCES users(id),
diff --git a/server/routes/assets.js b/server/routes/assets.js
index f6cd114..583adc4 100644
--- a/server/routes/assets.js
+++ b/server/routes/assets.js
@@ -70,6 +70,50 @@ router.post('/assets/:id/files', upload.single('file'), requireRole('admin', 'fi
   res.status(201).json({ file: one('SELECT id, file_name, mime_type, size, uploaded_at FROM asset_files WHERE id = ?', [result.lastInsertRowid]) });
 });
 
+router.get('/assets/:id/files/:fileId', (req, res) => {
+  const file = one('SELECT * FROM asset_files WHERE id = ? AND asset_id = ?', [req.params.fileId, req.params.id]);
+  if (!file) return res.status(404).json({ error: 'File not found' });
+  res.setHeader('Content-Type', file.mime_type || 'application/octet-stream');
+  res.setHeader('Content-Disposition', `attachment; filename="${file.file_name}"`);
+  return res.send(Buffer.from(file.content_base64, 'base64'));
+});
+
+router.delete('/assets/:id/files/:fileId', requireRole('admin', 'finance', 'operations'), (req, res) => {
+  const result = run('DELETE FROM asset_files WHERE id = ? AND asset_id = ?', [req.params.fileId, req.params.id]);
+  if (!result.changes) return res.status(404).json({ error: 'File not found' });
+  audit(req.user.id, 'delete', 'asset_file', req.params.fileId, null, { asset_id: req.params.id });
+  return res.status(204).end();
+});
+
+router.post('/assets/:id/warranties', requireRole('admin', 'finance', 'operations'), (req, res) => {
+  const b = req.body;
+  const result = run(
+    `INSERT INTO warranties (
+      asset_id, provider, phone, start_date, expiration_date, warranty_limit,
+      actual_usage, coverage_details, document_name, document_base64, created_at
+    ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+    [
+      req.params.id, b.provider || null, b.phone || null, b.start_date || null, b.expiration_date || null,
+      b.warranty_limit || null, b.actual_usage || null, b.coverage_details || null,
+      b.document_name || null, b.document_base64 || null, now()
+    ]
+  );
+  audit(req.user.id, 'create', 'warranty', result.lastInsertRowid, null, { ...b, document_base64: b.document_base64 ? '[stored]' : null });
+  res.status(201).json({
+    warranty: one(
+      'SELECT id, provider, phone, start_date, expiration_date, warranty_limit, actual_usage, coverage_details, document_name, created_at FROM warranties WHERE id = ?',
+      [result.lastInsertRowid]
+    )
+  });
+});
+
+router.delete('/assets/:id/warranties/:warrantyId', requireRole('admin', 'finance', 'operations'), (req, res) => {
+  const result = run('DELETE FROM warranties WHERE id = ? AND asset_id = ?', [req.params.warrantyId, req.params.id]);
+  if (!result.changes) return res.status(404).json({ error: 'Warranty not found' });
+  audit(req.user.id, 'delete', 'warranty', req.params.warrantyId, null, { asset_id: req.params.id });
+  return res.status(204).end();
+});
+
 router.post('/assets/:id/tasks', requireRole('admin', 'finance', 'operations'), (req, res) => {
   const created = now();
   const result = run(
@@ -80,4 +124,52 @@ router.post('/assets/:id/tasks', requireRole('admin', 'finance', 'operations'),
   res.status(201).json({ task: one('SELECT * FROM tasks WHERE id = ?', [result.lastInsertRowid]) });
 });
 
+router.put('/assets/:id/tasks/:taskId', requireRole('admin', 'finance', 'operations'), (req, res) => {
+  const before = one('SELECT * FROM tasks WHERE id = ? AND asset_id = ?', [req.params.taskId, req.params.id]);
+  if (!before) return res.status(404).json({ error: 'Task not found' });
+  run(
+    'UPDATE tasks SET title = ?, type = ?, status = ?, due_date = ?, notes = ?, updated_at = ? WHERE id = ?',
+    [
+      req.body.title ?? before.title,
+      req.body.type ?? before.type,
+      req.body.status ?? before.status,
+      req.body.due_date ?? before.due_date,
+      req.body.notes ?? before.notes,
+      now(),
+      req.params.taskId
+    ]
+  );
+  audit(req.user.id, 'update', 'task', req.params.taskId, before, req.body);
+  return res.json({ task: one('SELECT * FROM tasks WHERE id = ?', [req.params.taskId]) });
+});
+
+router.delete('/assets/:id/tasks/:taskId', requireRole('admin', 'finance', 'operations'), (req, res) => {
+  const result = run('DELETE FROM tasks WHERE id = ? AND asset_id = ?', [req.params.taskId, req.params.id]);
+  if (!result.changes) return res.status(404).json({ error: 'Task not found' });
+  audit(req.user.id, 'delete', 'task', req.params.taskId, null, { asset_id: req.params.id });
+  return res.status(204).end();
+});
+
+router.post('/assets/:id/notes', requireRole('admin', 'finance', 'operations'), (req, res) => {
+  if (!req.body.body) return res.status(400).json({ error: 'Note body is required' });
+  const result = run(
+    'INSERT INTO asset_notes (asset_id, body, created_by, created_at) VALUES (?, ?, ?, ?)',
+    [req.params.id, req.body.body, req.user.id, now()]
+  );
+  audit(req.user.id, 'create', 'asset_note', result.lastInsertRowid, null, { asset_id: req.params.id });
+  res.status(201).json({
+    note: one(
+      'SELECT n.id, n.body, n.created_at, u.name AS author FROM asset_notes n LEFT JOIN users u ON u.id = n.created_by WHERE n.id = ?',
+      [result.lastInsertRowid]
+    )
+  });
+});
+
+router.delete('/assets/:id/notes/:noteId', requireRole('admin', 'finance', 'operations'), (req, res) => {
+  const result = run('DELETE FROM asset_notes WHERE id = ? AND asset_id = ?', [req.params.noteId, req.params.id]);
+  if (!result.changes) return res.status(404).json({ error: 'Note not found' });
+  audit(req.user.id, 'delete', 'asset_note', req.params.noteId, null, { asset_id: req.params.id });
+  return res.status(204).end();
+});
+
 module.exports = router;
diff --git a/server/services/assets.js b/server/services/assets.js
index 52f1085..37ed21a 100644
--- a/server/services/assets.js
+++ b/server/services/assets.js
@@ -63,6 +63,14 @@ function hydrateAsset(id) {
   asset.tasks = all('SELECT * FROM tasks WHERE asset_id = ? ORDER BY due_date IS NULL, due_date', [id]);
   asset.warranties = all('SELECT id, provider, phone, start_date, expiration_date, warranty_limit, actual_usage, coverage_details, document_name, created_at FROM warranties WHERE asset_id = ?', [id]);
   asset.files = all('SELECT id, file_name, mime_type, size, uploaded_at FROM asset_files WHERE asset_id = ?', [id]);
+  asset.notes_log = all(
+    `SELECT n.id, n.body, n.created_at, u.name AS author
+     FROM asset_notes n
+     LEFT JOIN users u ON u.id = n.created_by
+     WHERE n.asset_id = ?
+     ORDER BY n.id DESC`,
+    [id]
+  );
   return asset;
 }
 
diff --git a/server/smoke-test.js b/server/smoke-test.js
index b109e67..916e969 100644
--- a/server/smoke-test.js
+++ b/server/smoke-test.js
@@ -141,10 +141,71 @@ async function main() {
       acquired_date: '2026-01-05',
       in_service_date: '2026-01-05',
       useful_life_months: 60,
-      depreciation_method: 'macrs_gds_200db_5'
+      depreciation_method: 'macrs_gds_200db_5',
+      books: [
+        { book_type: 'GAAP', active: true, depreciation_method: 'straight_line', convention: 'half_year', useful_life_months: 60, cost: 2400 },
+        { book_type: 'FEDERAL', active: true, depreciation_method: 'macrs_gds_200db_5', convention: 'half_year', useful_life_months: 60, section_179_amount: 500, bonus_percent: 0, cost: 2400 }
+      ]
     })
   });
 
+  const assetId = assetResult.asset.id;
+
+  // Per-book persistence: GAAP and FEDERAL must keep distinct methods.
+  const hydrated = await request(`/api/assets/${assetId}`, { headers: auth });
+  const gaapBook = hydrated.asset.books.find((book) => book.book_type === 'GAAP');
+  const federalBook = hydrated.asset.books.find((book) => book.book_type === 'FEDERAL');
+  if (gaapBook?.depreciation_method !== 'straight_line' || federalBook?.depreciation_method !== 'macrs_gds_200db_5') {
+    throw new Error('Per-book depreciation methods did not persist independently');
+  }
+  if (Number(federalBook.section_179_amount) !== 500) {
+    throw new Error('Per-book Section 179 amount did not persist');
+  }
+
+  // File cabinet (multipart upload bypasses the JSON request helper)
+  const uploadForm = new FormData();
+  uploadForm.append('file', new Blob(['invoice contents'], { type: 'text/plain' }), 'invoice.txt');
+  const uploadResponse = await fetch(`${baseUrl}/api/assets/${assetId}/files`, { method: 'POST', headers: auth, body: uploadForm });
+  const fileResult = await uploadResponse.json();
+  if (!uploadResponse.ok || !fileResult.file?.id) throw new Error('Asset file upload did not return a file');
+  const fileDownload = await fetch(`${baseUrl}/api/assets/${assetId}/files/${fileResult.file.id}`, { headers: auth });
+  if (!fileDownload.ok || (await fileDownload.text()) !== 'invoice contents') {
+    throw new Error('Asset file download did not return stored contents');
+  }
+
+  // Warranty
+  const warrantyResult = await request(`/api/assets/${assetId}/warranties`, {
+    method: 'POST',
+    headers: auth,
+    body: JSON.stringify({ provider: 'Acme Care', start_date: '2026-01-05', expiration_date: '2029-01-05', coverage_details: 'Parts and labor' })
+  });
+  if (!warrantyResult.warranty?.id) throw new Error('Warranty was not created');
+
+  // Task lifecycle
+  const taskResult = await request(`/api/assets/${assetId}/tasks`, {
+    method: 'POST',
+    headers: auth,
+    body: JSON.stringify({ title: 'Calibrate device', type: 'calibration', due_date: '2026-03-01' })
+  });
+  const completedTask = await request(`/api/assets/${assetId}/tasks/${taskResult.task.id}`, {
+    method: 'PUT',
+    headers: auth,
+    body: JSON.stringify({ status: 'complete' })
+  });
+  if (completedTask.task.status !== 'complete') throw new Error('Task status update did not persist');
+
+  // Notes
+  await request(`/api/assets/${assetId}/notes`, {
+    method: 'POST',
+    headers: auth,
+    body: JSON.stringify({ body: 'Received and tagged in receiving dock.' })
+  });
+
+  const detailed = await request(`/api/assets/${assetId}`, { headers: auth });
+  if (!detailed.asset.files.length || !detailed.asset.warranties.length || !detailed.asset.notes_log.length) {
+    throw new Error('Asset detail collections (files/warranties/notes) were not returned');
+  }
+
   const employeeResult = await request('/api/employees', {
     method: 'POST',
     headers: auth,
diff --git a/src/App.vue b/src/App.vue
index 3b48aed..094aba4 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -130,6 +130,10 @@
         <AssetDrawer
           v-model="assetDrawer"
           :asset-form="assetForm"
+          :asset-files="activeFiles"
+          :asset-notes="activeNotes"
+          :asset-tasks="activeTasks"
+          :asset-warranties="activeWarranties"
           :category-items="categoryItems"
           :drawer-error="drawerError"
           :entity-options="entityOptions"
@@ -139,8 +143,18 @@
           :selected-template-id="selectedTemplateId"
           :status-items="statusItems"
           :template-options="templateOptions"
+          @add-note="addNote"
+          @add-task="addTask"
+          @add-warranty="addWarranty"
+          @delete-file="deleteAssetFile"
+          @delete-note="deleteNote"
+          @delete-task="deleteTask"
+          @delete-warranty="deleteWarranty"
+          @download-file="downloadAssetFile"
           @save-asset="saveAsset"
           @select-template="applyTemplate"
+          @toggle-task="toggleTask"
+          @upload-file="uploadAssetFile"
         />
 
         <MassEditDialog
@@ -166,7 +180,7 @@ import AssetDrawer from './components/AssetDrawer.vue';
 import MassEditDialog from './components/MassEditDialog.vue';
 import TopNav from './components/TopNav.vue';
 import { apiRequest, loginRequest, saveBlob } from './services/api';
-import { blankAsset, defaultValueForField, normalizeCustomFields } from './utils/assets';
+import { blankAsset, defaultValueForField, makeDefaultBooks, normalizeCustomFields } from './utils/assets';
 import { currency, shortDate } from './utils/format';
 import { bookItems, customFieldTypes, navItems, statusItems, themeItems } from './constants';
 
@@ -193,6 +207,10 @@ export default {
   data() {
     return {
       activeView: 'dashboard',
+      activeFiles: [],
+      activeNotes: [],
+      activeTasks: [],
+      activeWarranties: [],
       assets: [],
       assetDrawer: false,
       assetFilters: { search: '', status: null },
@@ -373,7 +391,10 @@ export default {
       for (const field of normalizeCustomFields(template.custom_fields)) {
         if (customFields[field.key] === undefined) customFields[field.key] = defaultValueForField(field);
       }
-      this.assetForm = { ...this.assetForm, ...template.defaults, custom_fields: customFields, template_id: template.id };
+      const merged = { ...this.assetForm, ...template.defaults, custom_fields: customFields, template_id: template.id };
+      // For a brand-new asset, realign the book defaults to the template's method/life.
+      if (!merged.id) merged.books = makeDefaultBooks(merged);
+      this.assetForm = merged;
     },
     async assignAsset(form) {
       this.assignmentSaving = true;
@@ -406,11 +427,79 @@ export default {
       const blob = await (await this.api(`/api/reports/depreciation.pdf?year=${this.reportFilters.year}&book=${this.reportFilters.book}`)).blob();
       saveBlob(blob, `mixedassets-${this.reportFilters.book}-${this.reportFilters.year}.pdf`);
     },
-    editAsset(asset) {
-      this.assetForm = { ...blankAsset(), ...asset, custom_fields: asset.custom_fields || {} };
-      this.selectedTemplateId = asset.template_id || null;
+    async editAsset(asset) {
+      this.drawerError = '';
+      const full = await this.refreshActiveAsset(asset.id);
+      this.assetForm = {
+        ...blankAsset(),
+        ...full,
+        custom_fields: full.custom_fields || {},
+        books: full.books && full.books.length ? full.books : makeDefaultBooks(full)
+      };
+      this.selectedTemplateId = full.template_id || null;
       this.assetDrawer = true;
     },
+    async refreshActiveAsset(id) {
+      const data = await (await this.api(`/api/assets/${id}`)).json();
+      const asset = data.asset;
+      this.activeFiles = asset.files || [];
+      this.activeWarranties = asset.warranties || [];
+      this.activeTasks = asset.tasks || [];
+      this.activeNotes = asset.notes_log || [];
+      return asset;
+    },
+    clearActiveCollections() {
+      this.activeFiles = [];
+      this.activeWarranties = [];
+      this.activeTasks = [];
+      this.activeNotes = [];
+    },
+    async uploadAssetFile(file) {
+      const formData = new FormData();
+      formData.append('file', file);
+      await this.api(`/api/assets/${this.assetForm.id}/files`, { method: 'POST', body: formData });
+      await this.refreshActiveAsset(this.assetForm.id);
+    },
+    async downloadAssetFile(file) {
+      const blob = await (await this.api(`/api/assets/${this.assetForm.id}/files/${file.id}`)).blob();
+      saveBlob(blob, file.file_name);
+    },
+    async deleteAssetFile(fileId) {
+      await this.api(`/api/assets/${this.assetForm.id}/files/${fileId}`, { method: 'DELETE' });
+      await this.refreshActiveAsset(this.assetForm.id);
+    },
+    async addWarranty(warranty) {
+      await this.api(`/api/assets/${this.assetForm.id}/warranties`, { method: 'POST', body: JSON.stringify(warranty) });
+      await this.refreshActiveAsset(this.assetForm.id);
+    },
+    async deleteWarranty(id) {
+      await this.api(`/api/assets/${this.assetForm.id}/warranties/${id}`, { method: 'DELETE' });
+      await this.refreshActiveAsset(this.assetForm.id);
+    },
+    async addTask(task) {
+      await this.api(`/api/assets/${this.assetForm.id}/tasks`, { method: 'POST', body: JSON.stringify(task) });
+      await this.refreshActiveAsset(this.assetForm.id);
+      await this.loadDashboard();
+    },
+    async toggleTask(task) {
+      const status = task.status === 'complete' ? 'open' : 'complete';
+      await this.api(`/api/assets/${this.assetForm.id}/tasks/${task.id}`, { method: 'PUT', body: JSON.stringify({ status }) });
+      await this.refreshActiveAsset(this.assetForm.id);
+      await this.loadDashboard();
+    },
+    async deleteTask(id) {
+      await this.api(`/api/assets/${this.assetForm.id}/tasks/${id}`, { method: 'DELETE' });
+      await this.refreshActiveAsset(this.assetForm.id);
+      await this.loadDashboard();
+    },
+    async addNote(body) {
+      await this.api(`/api/assets/${this.assetForm.id}/notes`, { method: 'POST', body: JSON.stringify({ body }) });
+      await this.refreshActiveAsset(this.assetForm.id);
+    },
+    async deleteNote(id) {
+      await this.api(`/api/assets/${this.assetForm.id}/notes/${id}`, { method: 'DELETE' });
+      await this.refreshActiveAsset(this.assetForm.id);
+    },
     async exportAssets(format) {
       const blob = await (await this.api(`/api/export/assets?format=${format}`)).blob();
       saveBlob(blob, `mixedassets-assets.${format}`);
@@ -541,27 +630,38 @@ export default {
       this.assetForm.entity_id = this.entities[0]?.id || null;
       this.selectedTemplateId = null;
       this.drawerError = '';
+      this.clearActiveCollections();
       this.assetDrawer = true;
     },
     async saveAsset(assetInput) {
       this.saving = true;
       this.drawerError = '';
       try {
-        const payload = {
-          ...assetInput,
-          books: this.bookItems.map((book) => ({
-            book_type: book,
-            depreciation_method: assetInput.depreciation_method,
-            useful_life_months: assetInput.useful_life_months,
-            cost: assetInput.acquisition_cost
-          }))
-        };
+        const books = (assetInput.books && assetInput.books.length ? assetInput.books : makeDefaultBooks(assetInput))
+          .map((book) => ({
+            ...book,
+            cost: book.cost === '' || book.cost === null || book.cost === undefined ? null : Number(book.cost)
+          }));
+        const payload = { ...assetInput, books };
         const method = assetInput.id ? 'PUT' : 'POST';
         const url = assetInput.id ? `/api/assets/${assetInput.id}` : '/api/assets';
-        await this.api(url, { method, body: JSON.stringify(payload) });
-        this.assetDrawer = false;
+        const saved = await (await this.api(url, { method, body: JSON.stringify(payload) })).json();
         await this.loadAssets();
         await this.loadDashboard();
+        if (!assetInput.id && saved.asset) {
+          // Keep the drawer open on the freshly created asset so files, warranties,
+          // tasks, and notes can be attached without reopening.
+          this.assetForm = {
+            ...blankAsset(),
+            ...saved.asset,
+            custom_fields: saved.asset.custom_fields || {},
+            books: saved.asset.books && saved.asset.books.length ? saved.asset.books : makeDefaultBooks(saved.asset)
+          };
+          this.selectedTemplateId = saved.asset.template_id || null;
+          await this.refreshActiveAsset(saved.asset.id);
+        } else {
+          this.assetDrawer = false;
+        }
       } catch (error) {
         this.drawerError = error.message;
       } finally {
diff --git a/src/components/AssetDrawer.vue b/src/components/AssetDrawer.vue
index 3355375..1615ae5 100644
--- a/src/components/AssetDrawer.vue
+++ b/src/components/AssetDrawer.vue
@@ -1,56 +1,217 @@
 <template>
-  <v-navigation-drawer :model-value="modelValue" location="right" temporary width="520" @update:model-value="$emit('update:modelValue', $event)">
-    <div class="page-band">
-      <h2 class="text-h6 font-weight-bold">{{ assetForm.id ? 'Edit asset' : 'New asset' }}</h2>
+  <v-navigation-drawer :model-value="modelValue" location="right" temporary width="640" @update:model-value="$emit('update:modelValue', $event)">
+    <div class="page-band d-flex align-center">
+      <h2 class="text-h6 font-weight-bold">{{ localAsset.id ? 'Edit asset' : 'New asset' }}</h2>
+      <v-spacer />
+      <span v-if="localAsset.asset_id" class="text-caption quiet">{{ localAsset.asset_id }}</span>
     </div>
-    <div class="pa-4">
-      <v-select :model-value="selectedTemplateId" :items="templateOptions" label="Template" clearable @update:model-value="$emit('select-template', $event)" />
-      <div class="form-grid">
-        <v-text-field v-model="localAsset.asset_id" label="Asset ID" />
-        <v-select v-model="localAsset.entity_id" :items="entityOptions" label="Entity" />
-        <v-text-field v-model="localAsset.description" class="full" label="Description" />
-        <v-select v-model="localAsset.category" :items="categoryItems" label="Category" />
-        <v-select v-model="localAsset.status" :items="statusItems" label="Status" />
-        <v-text-field v-model.number="localAsset.acquisition_cost" type="number" label="Acquisition cost" />
-        <v-text-field v-model.number="localAsset.salvage_value" type="number" label="Salvage value" />
-        <v-text-field v-model="localAsset.acquired_date" type="date" label="Acquired date" />
-        <v-text-field v-model="localAsset.in_service_date" type="date" label="In-service date" />
-        <v-text-field v-model.number="localAsset.useful_life_months" type="number" label="Useful life months" />
-        <v-select v-model="localAsset.depreciation_method" :items="methodItems" item-title="title" item-value="value" label="Method" />
-        <v-text-field v-model="localAsset.location" label="Location" />
-        <v-text-field v-model="localAsset.department" label="Department" />
-        <v-text-field v-model="localAsset.custodian" label="Custodian" />
-        <v-text-field v-model="localAsset.vendor" label="Vendor" />
-        <v-text-field v-model="localAsset.serial_number" label="Serial number" />
-        <v-text-field v-model="localAsset.invoice_number" label="Invoice number" />
-        <v-text-field v-model="localAsset.gl_asset_account" label="Asset GL" />
-        <v-text-field v-model="localAsset.gl_expense_account" label="Expense GL" />
-        <v-textarea v-model="localAsset.notes" class="full" label="Notes" rows="2" />
-      </div>
 
-      <template v-if="selectedTemplateFields.length">
-        <v-divider class="my-4" />
-        <h3 class="section-title mb-3">Template fields</h3>
-        <div class="form-grid">
-          <template v-for="field in selectedTemplateFields" :key="field.key">
-            <v-switch
-              v-if="field.type === 'bool'"
-              v-model="localAsset.custom_fields[field.key]"
-              :label="field.label"
-              color="primary"
-              density="compact"
-              hide-details
-            />
-            <v-text-field
-              v-else
-              v-model="localAsset.custom_fields[field.key]"
-              :label="field.label"
-              :type="inputTypeForCustomField(field)"
-              :rules="field.required ? [requiredRule] : []"
-            />
+    <v-tabs v-model="tab" density="compact" color="primary" class="px-2">
+      <v-tab value="details">Details</v-tab>
+      <v-tab value="books">Books</v-tab>
+      <v-tab value="files">Files <v-badge v-if="assetFiles.length" :content="assetFiles.length" inline /></v-tab>
+      <v-tab value="warranties">Warranties <v-badge v-if="assetWarranties.length" :content="assetWarranties.length" inline /></v-tab>
+      <v-tab value="tasks">Tasks <v-badge v-if="assetTasks.length" :content="assetTasks.length" inline /></v-tab>
+      <v-tab value="notes">Notes <v-badge v-if="assetNotes.length" :content="assetNotes.length" inline /></v-tab>
+    </v-tabs>
+
+    <div class="pa-4">
+      <v-window v-model="tab">
+        <!-- DETAILS -->
+        <v-window-item value="details">
+          <v-select :model-value="selectedTemplateId" :items="templateOptions" label="Template" clearable @update:model-value="$emit('select-template', $event)" />
+          <div class="form-grid">
+            <v-text-field v-model="localAsset.asset_id" label="Asset ID" />
+            <v-select v-model="localAsset.entity_id" :items="entityOptions" label="Entity" />
+            <v-text-field v-model="localAsset.description" class="full" label="Description" />
+            <v-select v-model="localAsset.category" :items="categoryItems" label="Category" />
+            <v-select v-model="localAsset.status" :items="statusItems" label="Status" />
+            <v-text-field v-model.number="localAsset.acquisition_cost" type="number" label="Acquisition cost" />
+            <v-text-field v-model.number="localAsset.salvage_value" type="number" label="Salvage value" />
+            <v-text-field v-model.number="localAsset.land_value" type="number" label="Land value (non-depreciable)" />
+            <v-text-field v-model.number="localAsset.prior_depreciation" type="number" label="Prior depreciation" />
+            <v-text-field v-model="localAsset.acquired_date" type="date" label="Acquired date" />
+            <v-text-field v-model="localAsset.in_service_date" type="date" label="In-service date" />
+            <v-text-field v-model.number="localAsset.useful_life_months" type="number" label="Useful life months" />
+            <v-select v-model="localAsset.depreciation_method" :items="methodItems" item-title="title" item-value="value" label="Default method" />
+            <v-select v-model="localAsset.new_or_used" :items="newUsedItems" item-title="title" item-value="value" label="New / used" />
+            <v-text-field v-model.number="localAsset.business_use_percent" type="number" label="Business use %" />
+            <v-text-field v-model.number="localAsset.investment_use_percent" type="number" label="Investment use %" />
+            <v-switch v-model="localAsset.listed_property" label="Listed property (luxury auto limits)" color="primary" density="compact" hide-details class="full" />
+
+            <v-text-field v-model="localAsset.location" label="Location" />
+            <v-text-field v-model="localAsset.department" label="Department" />
+            <v-text-field v-model="localAsset.group_name" label="Group" />
+            <v-text-field v-model="localAsset.custodian" label="Custodian" />
+            <v-text-field v-model="localAsset.barcode_value" label="Barcode / tag value" />
+            <v-select v-model="localAsset.condition" :items="conditionItems" clearable label="Condition" />
+            <v-text-field v-model="localAsset.vendor" label="Vendor" />
+            <v-text-field v-model="localAsset.serial_number" label="Serial number" />
+            <v-text-field v-model="localAsset.invoice_number" label="Invoice number" />
+            <v-text-field v-model="localAsset.gl_asset_account" label="Asset GL" />
+            <v-text-field v-model="localAsset.gl_expense_account" label="Expense GL" />
+            <v-text-field v-model="localAsset.gl_accumulated_account" label="Accumulated GL" />
+            <v-textarea v-model="localAsset.notes" class="full" label="Summary notes" rows="2" />
+          </div>
+
+          <template v-if="selectedTemplateFields.length">
+            <v-divider class="my-4" />
+            <h3 class="section-title mb-3">Template fields</h3>
+            <div class="form-grid">
+              <template v-for="field in selectedTemplateFields" :key="field.key">
+                <v-switch
+                  v-if="field.type === 'bool'"
+                  v-model="localAsset.custom_fields[field.key]"
+                  :label="field.label"
+                  color="primary"
+                  density="compact"
+                  hide-details
+                />
+                <v-text-field
+                  v-else
+                  v-model="localAsset.custom_fields[field.key]"
+                  :label="field.label"
+                  :type="inputTypeForCustomField(field)"
+                  :rules="field.required ? [requiredRule] : []"
+                />
+              </template>
+            </div>
           </template>
-        </div>
-      </template>
+        </v-window-item>
+
+        <!-- BOOKS -->
+        <v-window-item value="books">
+          <p class="quiet text-body-2 mb-3">
+            Each book can carry its own cost, method, life, §179, bonus and convention. Leave cost blank to inherit the acquisition cost.
+          </p>
+          <v-expansion-panels variant="accordion" multiple>
+            <v-expansion-panel v-for="book in localAsset.books" :key="book.book_type">
+              <v-expansion-panel-title>
+                <div class="d-flex align-center" style="gap:10px;width:100%">
+                  <v-switch v-model="book.active" color="primary" density="compact" hide-details @click.stop />
+                  <span class="font-weight-bold">{{ book.book_type }}</span>
+                  <v-spacer />
+                  <span class="text-caption quiet">{{ methodLabel(book.depreciation_method) }}</span>
+                </div>
+              </v-expansion-panel-title>
+              <v-expansion-panel-text>
+                <div class="form-grid">
+                  <v-text-field v-model.number="book.cost" type="number" label="Cost (blank = inherit)" />
+                  <v-text-field v-model.number="book.useful_life_months" type="number" label="Useful life months" />
+                  <v-select v-model="book.depreciation_method" :items="methodItems" item-title="title" item-value="value" label="Method" class="full" />
+                  <v-select v-model="book.convention" :items="conventionItems" item-title="title" item-value="value" label="Convention" />
+                  <v-text-field v-model.number="book.section_179_amount" type="number" label="§179 amount" />
+                  <v-text-field v-model.number="book.bonus_percent" type="number" label="Bonus %" />
+                  <v-text-field v-model.number="book.business_use_percent" type="number" label="Business use %" />
+                  <v-text-field v-model.number="book.investment_use_percent" type="number" label="Investment use %" />
+                </div>
+              </v-expansion-panel-text>
+            </v-expansion-panel>
+          </v-expansion-panels>
+        </v-window-item>
+
+        <!-- FILES -->
+        <v-window-item value="files">
+          <template v-if="localAsset.id">
+            <v-btn variant="tonal" prepend-icon="mdi-paperclip" class="mb-3" @click="$refs.fileInput.click()">Attach file</v-btn>
+            <input ref="fileInput" hidden type="file" @change="onFilePick" />
+            <p v-if="!assetFiles.length" class="quiet text-body-2">Store invoices, photos, manuals, and insurance records here.</p>
+            <v-list v-else lines="two" density="compact">
+              <v-list-item v-for="file in assetFiles" :key="file.id" prepend-icon="mdi-file-outline">
+                <v-list-item-title>{{ file.file_name }}</v-list-item-title>
+                <v-list-item-subtitle>{{ formatBytes(file.size) }} · {{ file.mime_type }}</v-list-item-subtitle>
+                <template #append>
+                  <v-btn icon="mdi-download" size="small" variant="text" @click="$emit('download-file', file)" />
+                  <v-btn icon="mdi-delete-outline" size="small" variant="text" color="error" @click="$emit('delete-file', file.id)" />
+                </template>
+              </v-list-item>
+            </v-list>
+          </template>
+          <p v-else class="quiet text-body-2">Save the asset first, then attach files.</p>
+        </v-window-item>
+
+        <!-- WARRANTIES -->
+        <v-window-item value="warranties">
+          <template v-if="localAsset.id">
+            <v-list v-if="assetWarranties.length" lines="two" density="compact" class="mb-3">
+              <v-list-item v-for="w in assetWarranties" :key="w.id" prepend-icon="mdi-shield-check-outline">
+                <v-list-item-title>{{ w.provider || 'Warranty' }}</v-list-item-title>
+                <v-list-item-subtitle>
+                  {{ w.start_date || '—' }} → {{ w.expiration_date || '—' }}
+                  <template v-if="w.coverage_details"> · {{ w.coverage_details }}</template>
+                </v-list-item-subtitle>
+                <template #append>
+                  <v-btn icon="mdi-delete-outline" size="small" variant="text" color="error" @click="$emit('delete-warranty', w.id)" />
+                </template>
+              </v-list-item>
+            </v-list>
+            <v-divider class="mb-3" />
+            <div class="form-grid">
+              <v-text-field v-model="warrantyForm.provider" label="Provider" />
+              <v-text-field v-model="warrantyForm.phone" label="Phone" />
+              <v-text-field v-model="warrantyForm.start_date" type="date" label="Start date" />
+              <v-text-field v-model="warrantyForm.expiration_date" type="date" label="Expiration date" />
+              <v-text-field v-model="warrantyForm.warranty_limit" label="Limit (e.g. miles)" />
+              <v-text-field v-model="warrantyForm.actual_usage" label="Actual usage" />
+              <v-textarea v-model="warrantyForm.coverage_details" class="full" label="Coverage details" rows="2" />
+            </div>
+            <v-btn color="primary" variant="tonal" prepend-icon="mdi-plus" class="mt-2" @click="addWarranty">Add warranty</v-btn>
+          </template>
+          <p v-else class="quiet text-body-2">Save the asset first, then add warranties.</p>
+        </v-window-item>
+
+        <!-- TASKS -->
+        <v-window-item value="tasks">
+          <template v-if="localAsset.id">
+            <v-list v-if="assetTasks.length" lines="two" density="compact" class="mb-3">
+              <v-list-item v-for="task in assetTasks" :key="task.id">
+                <template #prepend>
+                  <v-checkbox-btn
+                    :model-value="task.status === 'complete'"
+                    @update:model-value="$emit('toggle-task', task)"
+                  />
+                </template>
+                <v-list-item-title :class="{ 'text-decoration-line-through quiet': task.status === 'complete' }">{{ task.title }}</v-list-item-title>
+                <v-list-item-subtitle>{{ task.type }} · due {{ task.due_date || '—' }}</v-list-item-subtitle>
+                <template #append>
+                  <v-btn icon="mdi-delete-outline" size="small" variant="text" color="error" @click="$emit('delete-task', task.id)" />
+                </template>
+              </v-list-item>
+            </v-list>
+            <v-divider class="mb-3" />
+            <div class="form-grid">
+              <v-text-field v-model="taskForm.title" class="full" label="Task title" />
+              <v-select v-model="taskForm.type" :items="taskTypeItems" label="Type" />
+              <v-text-field v-model="taskForm.due_date" type="date" label="Due date" />
+              <v-textarea v-model="taskForm.notes" class="full" label="Notes" rows="2" />
+            </div>
+            <v-btn color="primary" variant="tonal" prepend-icon="mdi-plus" class="mt-2" :disabled="!taskForm.title" @click="addTask">Add task</v-btn>
+          </template>
+          <p v-else class="quiet text-body-2">Save the asset first, then add tasks.</p>
+        </v-window-item>
+
+        <!-- NOTES -->
+        <v-window-item value="notes">
+          <template v-if="localAsset.id">
+            <v-textarea v-model="noteDraft" label="Add a note" rows="3" auto-grow />
+            <v-btn color="primary" variant="tonal" prepend-icon="mdi-plus" class="mb-3" :disabled="!noteDraft.trim()" @click="addNote">Add note</v-btn>
+            <v-timeline v-if="assetNotes.length" side="end" density="compact" truncate-line="both">
+              <v-timeline-item v-for="note in assetNotes" :key="note.id" dot-color="primary" size="x-small">
+                <div class="d-flex">
+                  <div>
+                    <div class="text-body-2" style="white-space:pre-wrap">{{ note.body }}</div>
+                    <div class="text-caption quiet">{{ note.author || 'Unknown' }} · {{ note.created_at }}</div>
+                  </div>
+                  <v-spacer />
+                  <v-btn icon="mdi-delete-outline" size="x-small" variant="text" color="error" @click="$emit('delete-note', note.id)" />
+                </div>
+              </v-timeline-item>
+            </v-timeline>
+            <p v-else class="quiet text-body-2">No notes yet.</p>
+          </template>
+          <p v-else class="quiet text-body-2">Save the asset first, then keep running notes.</p>
+        </v-window-item>
+      </v-window>
 
       <v-alert v-if="drawerError" class="mt-4" density="compact" type="error">{{ drawerError }}</v-alert>
       <div class="toolbar-row mt-4">
@@ -63,12 +224,25 @@
 </template>
 
 <script>
-import { inputTypeForCustomField } from '../utils/assets';
+import { inputTypeForCustomField, makeDefaultBooks } from '../utils/assets';
 import { clonePlain } from '../utils/clone';
+import { conditionItems, conventionItems, newUsedItems, taskTypeItems } from '../constants';
+
+function blankWarranty() {
+  return { provider: '', phone: '', start_date: '', expiration_date: '', warranty_limit: '', actual_usage: '', coverage_details: '' };
+}
+
+function blankTask() {
+  return { title: '', type: 'maintenance', due_date: '', notes: '' };
+}
 
 export default {
   props: {
     assetForm: { type: Object, required: true },
+    assetFiles: { type: Array, default: () => [] },
+    assetNotes: { type: Array, default: () => [] },
+    assetTasks: { type: Array, default: () => [] },
+    assetWarranties: { type: Array, default: () => [] },
     categoryItems: { type: Array, required: true },
     drawerError: { type: String, default: '' },
     entityOptions: { type: Array, required: true },
@@ -80,23 +254,79 @@ export default {
     statusItems: { type: Array, required: true },
     templateOptions: { type: Array, required: true }
   },
-  emits: ['save-asset', 'select-template', 'update:modelValue'],
+  emits: [
+    'save-asset', 'select-template', 'update:modelValue',
+    'upload-file', 'download-file', 'delete-file',
+    'add-warranty', 'delete-warranty',
+    'add-task', 'toggle-task', 'delete-task',
+    'add-note', 'delete-note'
+  ],
   data() {
     return {
-      localAsset: clonePlain(this.assetForm),
+      tab: 'details',
+      conditionItems,
+      conventionItems,
+      newUsedItems,
+      taskTypeItems,
+      localAsset: this.normalize(this.assetForm),
+      warrantyForm: blankWarranty(),
+      taskForm: blankTask(),
+      noteDraft: '',
       requiredRule: (value) => value !== null && value !== undefined && value !== '' || 'Required'
     };
   },
   watch: {
     assetForm: {
       handler(value) {
-        this.localAsset = clonePlain(value);
+        this.localAsset = this.normalize(value);
       },
       deep: true
+    },
+    modelValue(open) {
+      if (open) {
+        this.tab = 'details';
+        this.warrantyForm = blankWarranty();
+        this.taskForm = blankTask();
+        this.noteDraft = '';
+      }
     }
   },
   methods: {
-    inputTypeForCustomField
+    inputTypeForCustomField,
+    normalize(value) {
+      const asset = clonePlain(value);
+      if (!Array.isArray(asset.books) || !asset.books.length) {
+        asset.books = makeDefaultBooks(asset);
+      }
+      if (!asset.custom_fields || typeof asset.custom_fields !== 'object') asset.custom_fields = {};
+      return asset;
+    },
+    methodLabel(code) {
+      return this.methodItems.find((item) => item.value === code)?.title || code;
+    },
+    formatBytes(bytes) {
+      if (!bytes) return '0 B';
+      const units = ['B', 'KB', 'MB', 'GB'];
+      const index = Math.floor(Math.log(bytes) / Math.log(1024));
+      return `${(bytes / 1024 ** index).toFixed(index ? 1 : 0)} ${units[index]}`;
+    },
+    onFilePick(event) {
+      const [file] = event.target.files || [];
+      if (file) this.$emit('upload-file', file);
+      event.target.value = '';
+    },
+    addWarranty() {
+      this.$emit('add-warranty', { ...this.warrantyForm });
+      this.warrantyForm = blankWarranty();
+    },
+    addTask() {
+      this.$emit('add-task', { ...this.taskForm });
+      this.taskForm = blankTask();
+    },
+    addNote() {
+      this.$emit('add-note', this.noteDraft.trim());
+      this.noteDraft = '';
+    }
   }
 };
 </script>
diff --git a/src/constants.js b/src/constants.js
index c426bb5..e6039ff 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -2,6 +2,23 @@ export const bookItems = ['GAAP', 'FEDERAL', 'STATE', 'AMT', 'ACE', 'USER'];
 
 export const statusItems = ['in_service', 'cip', 'reserved', 'checked_out', 'disposed', 'retired'];
 
+export const conventionItems = [
+  { title: 'Half-year', value: 'half_year' },
+  { title: 'Mid-quarter', value: 'mid_quarter' },
+  { title: 'Mid-month', value: 'mid_month' },
+  { title: 'Full-month', value: 'full_month' },
+  { title: 'None', value: 'none' }
+];
+
+export const newUsedItems = [
+  { title: 'New', value: 'new' },
+  { title: 'Used', value: 'used' }
+];
+
+export const taskTypeItems = ['maintenance', 'inspection', 'calibration', 'renewal', 'compliance', 'other'];
+
+export const conditionItems = ['excellent', 'good', 'fair', 'poor', 'out_of_service'];
+
 export const customFieldTypes = [
   { title: 'Text', value: 'text' },
   { title: 'Number', value: 'numeric' },
diff --git a/src/utils/assets.js b/src/utils/assets.js
index 5e32b38..bb65d29 100644
--- a/src/utils/assets.js
+++ b/src/utils/assets.js
@@ -1,6 +1,23 @@
+export const BOOK_TYPES = ['GAAP', 'FEDERAL', 'STATE', 'AMT', 'ACE', 'USER'];
+
+export function makeDefaultBooks(asset = {}) {
+  return BOOK_TYPES.map((bookType) => ({
+    book_type: bookType,
+    active: bookType === 'GAAP' || bookType === 'FEDERAL',
+    cost: null,
+    depreciation_method: asset.depreciation_method || 'straight_line',
+    convention: 'half_year',
+    useful_life_months: asset.useful_life_months || 60,
+    section_179_amount: 0,
+    bonus_percent: 0,
+    business_use_percent: 100,
+    investment_use_percent: 0
+  }));
+}
+
 export function blankAsset() {
   const today = new Date().toISOString().slice(0, 10);
-  return {
+  const base = {
     asset_id: '',
     entity_id: null,
     description: '',
@@ -11,18 +28,30 @@ export function blankAsset() {
     in_service_date: today,
     useful_life_months: 60,
     salvage_value: 0,
+    land_value: 0,
+    prior_depreciation: 0,
     depreciation_method: 'straight_line',
     location: '',
     department: '',
+    group_name: '',
     custodian: '',
     vendor: '',
     serial_number: '',
     invoice_number: '',
     gl_asset_account: '',
     gl_expense_account: '',
+    gl_accumulated_account: '',
+    barcode_value: '',
+    condition: '',
+    new_or_used: 'new',
+    listed_property: false,
+    business_use_percent: 100,
+    investment_use_percent: 0,
     notes: '',
     custom_fields: {}
   };
+  base.books = makeDefaultBooks(base);
+  return base;
 }
 
 export function slugFieldKey(value) {