diff --git a/src/contexts/budget/storageUtils.ts b/src/contexts/budget/storageUtils.ts
index 4727403..4fea6aa 100644
--- a/src/contexts/budget/storageUtils.ts
+++ b/src/contexts/budget/storageUtils.ts
@@ -21,6 +21,11 @@ export const saveTransactionsToStorage = (transactions: Transaction[]): void =>
   localStorage.setItem('transactions', JSON.stringify(transactions));
 };
 
+// 모든 트랜잭션 삭제
+export const clearAllTransactions = (): void => {
+  localStorage.removeItem('transactions');
+};
+
 // 카테고리 예산 불러오기
 export const loadCategoryBudgetsFromStorage = (): Record<string, number> => {
   const storedCategoryBudgets = localStorage.getItem('categoryBudgets');
@@ -43,6 +48,13 @@ export const saveCategoryBudgetsToStorage = (categoryBudgets: Record<string, num
   localStorage.setItem('categoryBudgets', JSON.stringify(categoryBudgets));
 };
 
+// 모든 카테고리 예산 삭제
+export const clearAllCategoryBudgets = (): void => {
+  localStorage.removeItem('categoryBudgets');
+  // 기본값으로 재설정
+  saveCategoryBudgetsToStorage(DEFAULT_CATEGORY_BUDGETS);
+};
+
 // 예산 데이터 불러오기
 export const loadBudgetDataFromStorage = (): BudgetData => {
   const storedBudgetData = localStorage.getItem('budgetData');
@@ -67,3 +79,19 @@ export const loadBudgetDataFromStorage = (): BudgetData => {
 export const saveBudgetDataToStorage = (budgetData: BudgetData): void => {
   localStorage.setItem('budgetData', JSON.stringify(budgetData));
 };
+
+// 모든 예산 데이터 삭제
+export const clearAllBudgetData = (): void => {
+  localStorage.removeItem('budgetData');
+  // 기본값으로 재설정
+  const initialData = getInitialBudgetData();
+  saveBudgetDataToStorage(initialData);
+};
+
+// 모든 데이터 초기화 (첫 로그인 상태)
+export const resetAllData = (): void => {
+  clearAllTransactions();
+  clearAllCategoryBudgets();
+  clearAllBudgetData();
+  localStorage.removeItem('hasVisitedBefore');
+};
diff --git a/src/contexts/budget/useBudgetState.ts b/src/contexts/budget/useBudgetState.ts
index 449409f..6e7b4ce 100644
--- a/src/contexts/budget/useBudgetState.ts
+++ b/src/contexts/budget/useBudgetState.ts
@@ -8,7 +8,7 @@ import {
   loadCategoryBudgetsFromStorage, 
   saveCategoryBudgetsToStorage, 
   loadBudgetDataFromStorage, 
-  saveBudgetDataToStorage 
+  saveBudgetDataToStorage
 } from './storageUtils';
 import { 
   calculateCategorySpending, 
diff --git a/src/pages/Index.tsx b/src/pages/Index.tsx
index 665590b..3c67c03 100644
--- a/src/pages/Index.tsx
+++ b/src/pages/Index.tsx
@@ -10,6 +10,7 @@ import WelcomeDialog from '@/components/onboarding/WelcomeDialog';
 import { formatCurrency, calculatePercentage } from '@/utils/formatters';
 import { useBudget } from '@/contexts/BudgetContext';
 import { useAuth } from '@/contexts/auth';
+import { resetAllData } from '@/contexts/budget/storageUtils';
 
 // 메인 컴포넌트
 const Index = () => {
@@ -26,11 +27,13 @@ const Index = () => {
   const { user } = useAuth();
   const [showWelcome, setShowWelcome] = useState(false);
 
-  // 첫 방문 여부 확인
+  // 첫 방문 여부 확인 및 데이터 초기화
   useEffect(() => {
     const hasVisitedBefore = localStorage.getItem('hasVisitedBefore');
     
     if (!hasVisitedBefore) {
+      // 첫 로그인으로 가정하고 모든 데이터 초기화
+      resetAllData();
       setShowWelcome(true);
       // 방문 기록 저장
       localStorage.setItem('hasVisitedBefore', 'true');