diff --git a/APP/src/app/features/expense/models/expense.model.ts b/APP/src/app/features/expense/models/expense.model.ts
index 48cc39d..a0136ed 100644
--- a/APP/src/app/features/expense/models/expense.model.ts
+++ b/APP/src/app/features/expense/models/expense.model.ts
@@ -8,11 +8,11 @@ export interface PagedResult<T> {
 
 export interface MinistryDto { id: number; name_en: string; name_zh: string | null; sortOrder: number; isActive: boolean; label?: string; }
 
-export interface ExpenseSubCategoryDto { id: number; groupId: number; name_en: string; name_zh: string | null; sortOrder: number; isActive: boolean; label?: string; form990LineId: number | null; form990LineCode: string | null; }
-export interface ExpenseCategoryGroupDto { id: number; name_en: string; name_zh: string | null; sortOrder: number; isActive: boolean; subCategories: ExpenseSubCategoryDto[]; label?: string; form990LineId: number | null; form990LineCode: string | null; }
-export interface CreateExpenseGroupRequest { name_en: string; name_zh: string | null; sortOrder: number; form990LineId: number | null; }
+export interface ExpenseSubCategoryDto { id: number; groupId: number; name_en: string; name_zh: string | null; sortOrder: number; isActive: boolean; label?: string; form990LineId: number | null; form990LineCode: string | null; form1099BoxId: number | null; form1099BoxCode: string | null; }
+export interface ExpenseCategoryGroupDto { id: number; name_en: string; name_zh: string | null; sortOrder: number; isActive: boolean; subCategories: ExpenseSubCategoryDto[]; label?: string; form990LineId: number | null; form990LineCode: string | null; form1099BoxId: number | null; form1099BoxCode: string | null; }
+export interface CreateExpenseGroupRequest { name_en: string; name_zh: string | null; sortOrder: number; form990LineId: number | null; form1099BoxId: number | null; }
 export interface UpdateExpenseGroupRequest extends CreateExpenseGroupRequest { isActive: boolean; }
-export interface CreateExpenseSubCategoryRequest { groupId: number; name_en: string; name_zh: string | null; sortOrder: number; form990LineId: number | null; }
+export interface CreateExpenseSubCategoryRequest { groupId: number; name_en: string; name_zh: string | null; sortOrder: number; form990LineId: number | null; form1099BoxId: number | null; }
 export interface UpdateExpenseSubCategoryRequest extends CreateExpenseSubCategoryRequest { isActive: boolean; }
 
 export interface ExpenseLineItemDto {
@@ -28,6 +28,7 @@ export interface ExpenseListItemDto {
   expenseDate: string; hasReceipt: boolean;
   checkNumber: string | null;
   reviewedByName: string | null; reviewedAt: string | null; reviewNotes: string | null;
+  payeeId: number | null;
 }
 export interface ExpenseDto extends ExpenseListItemDto {
   notes: string | null;
@@ -70,6 +71,7 @@ export interface CreateExpenseRequest {
   type: ExpenseType; ministryId: number; lines: ExpenseLineInput[];
   description: string; vendorName: string | null; memberId: number | null;
   checkNumber: string | null; expenseDate: string; notes: string | null;
+  payeeId: number | null;
 }
 export type UpdateExpenseRequest = CreateExpenseRequest;
 export interface RejectExpenseRequest { reviewNotes: string | null; }
diff --git a/APP/src/app/features/expense/pages/expense-categories-page/expense-categories-page.component.html b/APP/src/app/features/expense/pages/expense-categories-page/expense-categories-page.component.html
index 458050b..d89e260 100644
--- a/APP/src/app/features/expense/pages/expense-categories-page/expense-categories-page.component.html
+++ b/APP/src/app/features/expense/pages/expense-categories-page/expense-categories-page.component.html
@@ -91,7 +91,7 @@
         Sort order
         <kendo-numerictextbox [(ngModel)]="groupForm.sortOrder" [format]="'n0'" [decimals]="0" [min]="0"></kendo-numerictextbox>
       </label>
-      <label class="flex flex-col gap-1 md:col-span-2">
+      <label class="flex flex-col gap-1">
         <span>Form 990 Line / 990 行</span>
         <kendo-dropdownlist
           [data]="form990Lines"
@@ -100,6 +100,15 @@
           [(ngModel)]="groupForm.form990LineId">
         </kendo-dropdownlist>
       </label>
+      <label class="flex flex-col gap-1">
+        <span>1099 Box / 1099 框</span>
+        <kendo-dropdownlist
+          [data]="form1099Boxes"
+          textField="label" valueField="id" [valuePrimitive]="true"
+          [defaultItem]="{ id: null, label: '— none —' }"
+          [(ngModel)]="groupForm.form1099BoxId">
+        </kendo-dropdownlist>
+      </label>
       <label *ngIf="editingGroupId != null" class="flex items-center gap-2 md:col-span-2">
         <input type="checkbox" [(ngModel)]="groupForm.isActive" /> Active
       </label>
@@ -158,7 +167,7 @@
         Sort order
         <kendo-numerictextbox [(ngModel)]="subForm.sortOrder" [format]="'n0'" [decimals]="0" [min]="0"></kendo-numerictextbox>
       </label>
-      <label class="flex flex-col gap-1 md:col-span-2">
+      <label class="flex flex-col gap-1">
         <span>Form 990 Line / 990 行</span>
         <kendo-dropdownlist
           [data]="form990Lines"
@@ -167,6 +176,15 @@
           [(ngModel)]="subForm.form990LineId">
         </kendo-dropdownlist>
       </label>
+      <label class="flex flex-col gap-1">
+        <span>1099 Box / 1099 框</span>
+        <kendo-dropdownlist
+          [data]="form1099Boxes"
+          textField="label" valueField="id" [valuePrimitive]="true"
+          [defaultItem]="{ id: null, label: '— none —' }"
+          [(ngModel)]="subForm.form1099BoxId">
+        </kendo-dropdownlist>
+      </label>
       <label *ngIf="editingSubId != null" class="flex items-center gap-2 md:col-span-2">
         <input type="checkbox" [(ngModel)]="subForm.isActive" /> Active
       </label>
diff --git a/APP/src/app/features/expense/pages/expense-categories-page/expense-categories-page.component.ts b/APP/src/app/features/expense/pages/expense-categories-page/expense-categories-page.component.ts
index d467959..90318f6 100644
--- a/APP/src/app/features/expense/pages/expense-categories-page/expense-categories-page.component.ts
+++ b/APP/src/app/features/expense/pages/expense-categories-page/expense-categories-page.component.ts
@@ -10,6 +10,7 @@ import { ContextMenuModule, ContextMenuComponent, ContextMenuSelectEvent } from
 import { ExpenseCategoryApiService } from '../../services/expense-category-api.service';
 import { ExpenseCategoryGroupDto, ExpenseSubCategoryDto, CategoryAiSuggestion } from '../../models/expense.model';
 import { Form990ExpenseLineDto } from '../../../finance-report/models/form990-report.model';
+import { Form1099Box } from '../../../payee1099/models/payee1099.model';
 
 @Component({
   selector: 'app-expense-categories-page',
@@ -23,6 +24,7 @@ export class ExpenseCategoriesPageComponent implements OnInit {
   selectedGroup: ExpenseCategoryGroupDto | null = null;
   loading = false;
   form990Lines: Form990ExpenseLineDto[] = [];
+  form1099Boxes: (Form1099Box & { label: string })[] = [];
 
   @ViewChild('groupMenu') groupMenu!: ContextMenuComponent;
   @ViewChild('subMenu') subMenu!: ContextMenuComponent;
@@ -33,13 +35,13 @@ export class ExpenseCategoriesPageComponent implements OnInit {
 
   groupDialogOpen = false;
   editingGroupId: number | null = null;
-  groupForm = { name_en: '', name_zh: '', sortOrder: 0, isActive: true, form990LineId: null as number | null };
+  groupForm = { name_en: '', name_zh: '', sortOrder: 0, isActive: true, form990LineId: null as number | null, form1099BoxId: null as number | null };
   groupAiLoading = false;
   groupAiSuggestion: CategoryAiSuggestion | null = null;
 
   subDialogOpen = false;
   editingSubId: number | null = null;
-  subForm = { name_en: '', name_zh: '', sortOrder: 0, isActive: true, form990LineId: null as number | null };
+  subForm = { name_en: '', name_zh: '', sortOrder: 0, isActive: true, form990LineId: null as number | null, form1099BoxId: null as number | null };
   subAiLoading = false;
   subAiSuggestion: CategoryAiSuggestion | null = null;
 
@@ -48,6 +50,7 @@ export class ExpenseCategoriesPageComponent implements OnInit {
   ngOnInit(): void {
     this.load();
     this.api.getForm990Lines().subscribe(lines => { this.form990Lines = lines; });
+    this.api.getForm1099Boxes().subscribe(boxes => { this.form1099Boxes = boxes; });
   }
 
   load(): void {
@@ -111,13 +114,13 @@ export class ExpenseCategoriesPageComponent implements OnInit {
 
   openNewGroup(): void {
     this.editingGroupId = null;
-    this.groupForm = { name_en: '', name_zh: '', sortOrder: this.groups.length + 1, isActive: true, form990LineId: null };
+    this.groupForm = { name_en: '', name_zh: '', sortOrder: this.groups.length + 1, isActive: true, form990LineId: null, form1099BoxId: null };
     this.resetGroupAi();
     this.groupDialogOpen = true;
   }
   openEditGroup(g: ExpenseCategoryGroupDto): void {
     this.editingGroupId = g.id;
-    this.groupForm = { name_en: g.name_en, name_zh: g.name_zh ?? '', sortOrder: g.sortOrder, isActive: g.isActive, form990LineId: g.form990LineId };
+    this.groupForm = { name_en: g.name_en, name_zh: g.name_zh ?? '', sortOrder: g.sortOrder, isActive: g.isActive, form990LineId: g.form990LineId, form1099BoxId: g.form1099BoxId };
     this.resetGroupAi();
     this.groupDialogOpen = true;
   }
@@ -143,7 +146,7 @@ export class ExpenseCategoriesPageComponent implements OnInit {
   }
   dismissGroupAiSuggestion(): void { this.groupAiSuggestion = null; }
   saveGroup(): void {
-    const body = { name_en: this.groupForm.name_en, name_zh: this.groupForm.name_zh || null, sortOrder: this.groupForm.sortOrder, form990LineId: this.groupForm.form990LineId };
+    const body = { name_en: this.groupForm.name_en, name_zh: this.groupForm.name_zh || null, sortOrder: this.groupForm.sortOrder, form990LineId: this.groupForm.form990LineId, form1099BoxId: this.groupForm.form1099BoxId };
     const done = () => { this.groupDialogOpen = false; this.load(); };
     if (this.editingGroupId == null) this.api.createGroup(body).subscribe(done);
     else this.api.updateGroup(this.editingGroupId, { ...body, isActive: this.groupForm.isActive }).subscribe(done);
@@ -156,13 +159,13 @@ export class ExpenseCategoriesPageComponent implements OnInit {
   openNewSub(): void {
     if (!this.selectedGroup) return;
     this.editingSubId = null;
-    this.subForm = { name_en: '', name_zh: '', sortOrder: this.subCategories.length + 1, isActive: true, form990LineId: null };
+    this.subForm = { name_en: '', name_zh: '', sortOrder: this.subCategories.length + 1, isActive: true, form990LineId: null, form1099BoxId: null };
     this.resetSubAi();
     this.subDialogOpen = true;
   }
   openEditSub(s: ExpenseSubCategoryDto): void {
     this.editingSubId = s.id;
-    this.subForm = { name_en: s.name_en, name_zh: s.name_zh ?? '', sortOrder: s.sortOrder, isActive: s.isActive, form990LineId: s.form990LineId };
+    this.subForm = { name_en: s.name_en, name_zh: s.name_zh ?? '', sortOrder: s.sortOrder, isActive: s.isActive, form990LineId: s.form990LineId, form1099BoxId: s.form1099BoxId };
     this.resetSubAi();
     this.subDialogOpen = true;
   }
@@ -195,7 +198,7 @@ export class ExpenseCategoriesPageComponent implements OnInit {
   dismissSubAiSuggestion(): void { this.subAiSuggestion = null; }
   saveSub(): void {
     if (!this.selectedGroup) return;
-    const body = { groupId: this.selectedGroup.id, name_en: this.subForm.name_en, name_zh: this.subForm.name_zh || null, sortOrder: this.subForm.sortOrder, form990LineId: this.subForm.form990LineId };
+    const body = { groupId: this.selectedGroup.id, name_en: this.subForm.name_en, name_zh: this.subForm.name_zh || null, sortOrder: this.subForm.sortOrder, form990LineId: this.subForm.form990LineId, form1099BoxId: this.subForm.form1099BoxId };
     const done = () => { this.subDialogOpen = false; this.load(); };
     if (this.editingSubId == null) this.api.createSub(body).subscribe(done);
     else this.api.updateSub(this.editingSubId, { ...body, isActive: this.subForm.isActive }).subscribe(done);
diff --git a/APP/src/app/features/expense/services/expense-category-api.service.ts b/APP/src/app/features/expense/services/expense-category-api.service.ts
index 5680d91..7c08134 100644
--- a/APP/src/app/features/expense/services/expense-category-api.service.ts
+++ b/APP/src/app/features/expense/services/expense-category-api.service.ts
@@ -9,6 +9,7 @@ import {
   ExpenseCategoryAiRequest, CategoryAiSuggestion,
 } from '../models/expense.model';
 import { Form990ExpenseLineDto } from '../../finance-report/models/form990-report.model';
+import { Form1099Box } from '../../payee1099/models/payee1099.model';
 
 @Injectable({ providedIn: 'root' })
 export class ExpenseCategoryApiService {
@@ -38,4 +39,9 @@ export class ExpenseCategoryApiService {
     return this.http.get<Form990ExpenseLineDto[]>(this.apiConfig.getApiUrl('form990-report') + '/lines')
       .pipe(map(rows => rows.map(r => ({ ...r, label: `${r.lineCode} — ${r.name_en}${r.name_zh ? ' / ' + r.name_zh : ''}` }))));
   }
+
+  getForm1099Boxes(): Observable<(Form1099Box & { label: string })[]> {
+    return this.http.get<Form1099Box[]>(this.apiConfig.getApiUrl('form1099-report') + '/boxes')
+      .pipe(map(rows => rows.map(b => ({ ...b, label: `${b.boxCode} — ${b.name_en}${b.name_zh ? ' / ' + b.name_zh : ''}` }))));
+  }
 }