diff --git a/libs/ui/src/lib/services/data.service.spec.ts b/libs/ui/src/lib/services/data.service.spec.ts
new file mode 100644
index 000000000..98c85f2f9
--- /dev/null
+++ b/libs/ui/src/lib/services/data.service.spec.ts
@@ -0,0 +1,83 @@
+import { CreateBudgetDto, UpdateBudgetDto } from '@ghostfolio/common/dtos';
+
+import {
+  provideHttpClient,
+  withInterceptorsFromDi
+} from '@angular/common/http';
+import {
+  HttpTestingController,
+  provideHttpClientTesting
+} from '@angular/common/http/testing';
+import { TestBed } from '@angular/core/testing';
+
+import { DataService } from './data.service';
+
+describe('DataService budget methods', () => {
+  let dataService: DataService;
+  let httpTestingController: HttpTestingController;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [
+        DataService,
+        provideHttpClient(withInterceptorsFromDi()),
+        provideHttpClientTesting()
+      ]
+    });
+
+    dataService = TestBed.inject(DataService);
+    httpTestingController = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => {
+    httpTestingController.verify();
+  });
+
+  it('fetches budgets for a month', () => {
+    dataService.fetchBudgets({ month: '2026-06' }).subscribe();
+
+    const request = httpTestingController.expectOne(
+      '/api/v1/budgets?month=2026-06'
+    );
+
+    expect(request.request.method).toBe('GET');
+  });
+
+  it('creates a budget', () => {
+    const budget: CreateBudgetDto = {
+      amount: 500,
+      categoryId: 'category-1',
+      month: '2026-06'
+    };
+
+    dataService.createBudget(budget).subscribe();
+
+    const request = httpTestingController.expectOne('/api/v1/budgets');
+
+    expect(request.request.method).toBe('POST');
+    expect(request.request.body).toEqual(budget);
+  });
+
+  it('updates a budget', () => {
+    const budget: UpdateBudgetDto = {
+      amount: 650,
+      categoryId: 'category-1',
+      month: '2026-06'
+    };
+
+    dataService.updateBudget({ budget, id: 'budget-1' }).subscribe();
+
+    const request = httpTestingController.expectOne('/api/v1/budgets/budget-1');
+
+    expect(request.request.method).toBe('PUT');
+    expect(request.request.body).toEqual(budget);
+  });
+
+  it('deletes a budget', () => {
+    dataService.deleteBudget('budget-1').subscribe();
+
+    const request = httpTestingController.expectOne('/api/v1/budgets/budget-1');
+
+    expect(request.request.method).toBe('DELETE');
+  });
+});
diff --git a/libs/ui/src/lib/services/data.service.ts b/libs/ui/src/lib/services/data.service.ts
index 8d16c6d35..878e554c5 100644
--- a/libs/ui/src/lib/services/data.service.ts
+++ b/libs/ui/src/lib/services/data.service.ts
@@ -2,6 +2,7 @@ import {
   CreateAccessDto,
   CreateAccountBalanceDto,
   CreateAccountDto,
+  CreateBudgetDto,
   CreateOrderDto,
   CreateTagDto,
   CreateWatchlistItemDto,
@@ -9,6 +10,7 @@ import {
   TransferBalanceDto,
   UpdateAccessDto,
   UpdateAccountDto,
+  UpdateBudgetDto,
   UpdateBulkMarketDataDto,
   UpdateOrderDto,
   UpdateOwnAccessTokenDto,
@@ -33,6 +35,8 @@ import {
   AssetResponse,
   BenchmarkMarketDataDetailsResponse,
   BenchmarkResponse,
+  BudgetResponse,
+  BudgetsResponse,
   CreateStripeCheckoutSessionResponse,
   DataProviderHealthResponse,
   DataProviderHistoricalResponse,
@@ -193,6 +197,14 @@ export class DataService {
     );
   }
 
+  public createBudget(budget: CreateBudgetDto) {
+    return this.http.post<BudgetResponse>('/api/v1/budgets', budget);
+  }
+
+  public deleteBudget(id: string) {
+    return this.http.delete<void>(`/api/v1/budgets/${id}`);
+  }
+
   public fetchAccount(aAccountId: string) {
     return this.http.get<AccountResponse>(`/api/v1/account/${aAccountId}`);
   }
@@ -379,6 +391,16 @@ export class DataService {
     );
   }
 
+  public fetchBudgets({ month }: { month?: string } = {}) {
+    let params = new HttpParams();
+
+    if (month) {
+      params = params.append('month', month);
+    }
+
+    return this.http.get<BudgetsResponse>('/api/v1/budgets', { params });
+  }
+
   public fetchAssetProfiles({
     filters,
     skip,
@@ -935,6 +957,10 @@ export class DataService {
     );
   }
 
+  public updateBudget({ budget, id }: { budget: UpdateBudgetDto; id: string }) {
+    return this.http.put<BudgetResponse>(`/api/v1/budgets/${id}`, budget);
+  }
+
   public updateInfo() {
     this.http.get<InfoItem>('/api/v1/info').subscribe((info) => {
       const utmSource = window.localStorage.getItem('utm_source') as