diff --git a/mooney/src/main/java/tamtam/mooney/domain/budget/service/BudgetService.java b/mooney/src/main/java/tamtam/mooney/domain/budget/service/BudgetService.java
index 91a60a2..dbe9de4 100644
--- a/mooney/src/main/java/tamtam/mooney/domain/budget/service/BudgetService.java
+++ b/mooney/src/main/java/tamtam/mooney/domain/budget/service/BudgetService.java
@@ -105,7 +105,7 @@ public BudgetProgressResponseDto getBudgetProgress(int year, int month, LocalDat
         List<CategoryBudgetProgressUnitDto> categoryBudgets = categoryBudgetService.getCategoryBudgetProgresses(user, monthlyBudget, startOfMonth);
 
         // 사용한 예산 비율 계산
-        int budgetUsagePercentage = (int) ((totalExpenseAmount + pendingExpenseAmount) * 100 / monthlyBudgetAmount);
+        int budgetUsagePercentage = monthlyBudgetAmount > 0 ? (int) ((totalExpenseAmount + pendingExpenseAmount) * 100 / monthlyBudgetAmount) : 0;
 
         return BudgetProgressResponseDto.builder()
                 .remainingBudgetAmount(remainingBudgetAmount)
diff --git a/mooney/src/main/java/tamtam/mooney/domain/budget/service/CategoryBudgetService.java b/mooney/src/main/java/tamtam/mooney/domain/budget/service/CategoryBudgetService.java
index a8fbdd4..2a7f90c 100644
--- a/mooney/src/main/java/tamtam/mooney/domain/budget/service/CategoryBudgetService.java
+++ b/mooney/src/main/java/tamtam/mooney/domain/budget/service/CategoryBudgetService.java
@@ -1,6 +1,7 @@
 package tamtam.mooney.domain.budget.service;
 
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import tamtam.mooney.domain.budget.dto.CategoryBudgetPlanUnitDto;
@@ -10,8 +11,10 @@
 import tamtam.mooney.domain.budget.entity.MonthlyBudget;
 import tamtam.mooney.domain.budget.repository.CategoryBudgetRepository;
 import tamtam.mooney.domain.enums.ExpenseCategory;
+import tamtam.mooney.domain.transaction.service.ExpenseService;
 import tamtam.mooney.domain.transaction.service.TransactionService;
 import tamtam.mooney.domain.user.entity.User;
+import tamtam.mooney.domain.user.service.UserService;
 
 import java.time.LocalDate;
 import java.util.Arrays;
@@ -21,12 +24,14 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+@Slf4j
 @Service
 @Transactional
 @RequiredArgsConstructor
 public class CategoryBudgetService {
     private final CategoryBudgetRepository categoryBudgetRepository;
     private final TransactionService transactionService;
+    private final ExpenseService expenseService;
 
     public void saveCategoryBudgets(MonthlyBudget monthlyBudget, List<CategoryBudgetSimpleUnitDto> categoryBudgets) {
         Set<ExpenseCategory> existingCategories = categoryBudgets.stream()
@@ -55,12 +60,12 @@ public List<CategoryBudgetProgressUnitDto> getCategoryBudgetProgresses(User user
         List<CategoryBudget> budgets = findByMonthlyBudget(monthlyBudget);
 
         // 특정 기간 동안의 모든 카테고리별 총 지출
-        Map<String, Long> totalExpensesByCategory = transactionService.mapTotalExpenseForAllCategories(user, startOfMonth);
+        Map<ExpenseCategory, Long> totalExpensesByCategory = expenseService.mapTotalExpenseForAllCategories(user, startOfMonth);
 
         // 각 카테고리의 실제 지출 계산
         return budgets.stream()
                 .map(cb -> {
-                    Long spent = totalExpensesByCategory.getOrDefault(cb.getExpenseCategory().name(), 0L);
+                    Long spent = totalExpensesByCategory.getOrDefault(cb.getExpenseCategory(), 0L);
                     int spentPercentage = cb.getAmount() > 0 ? (int) ((spent * 100.0) / cb.getAmount()) : 0;
                     long remaining = Math.max(cb.getAmount() - spent, 0);
 
@@ -83,14 +88,14 @@ public List<CategoryBudgetPlanUnitDto> getCategoryBudgetPlans(User user, Monthly
         List<CategoryBudget> budgets = findByMonthlyBudget(monthlyBudget);
 
         // 지난달 모든 카테고리의 총 지출
-        Map<String, Long> lastMonthExpensesByCategory = transactionService.mapTotalExpenseForAllCategories(user, lastMonthStart);
+        Map<ExpenseCategory, Long> lastMonthExpensesByCategory = expenseService.mapTotalExpenseForAllCategories(user, lastMonthStart);
 
         // 각 카테고리별 예산 계획 생성
         return budgets.stream()
                 .map(cb -> new CategoryBudgetPlanUnitDto(
                         cb.getCategoryBudgetId(),
                         cb.getExpenseCategory(),
-                        lastMonthExpensesByCategory.getOrDefault(cb.getExpenseCategory().name(), 0L),
+                        lastMonthExpensesByCategory.getOrDefault(cb.getExpenseCategory(), 0L),
                         cb.getAmount()
                 )).collect(Collectors.toList());
     }
diff --git a/mooney/src/main/java/tamtam/mooney/domain/budget/service/MonthlyBudgetService.java b/mooney/src/main/java/tamtam/mooney/domain/budget/service/MonthlyBudgetService.java
index 5ee96ad..f258f4f 100644
--- a/mooney/src/main/java/tamtam/mooney/domain/budget/service/MonthlyBudgetService.java
+++ b/mooney/src/main/java/tamtam/mooney/domain/budget/service/MonthlyBudgetService.java
@@ -52,7 +52,7 @@ public UserHomeWeeklyBudgetDto getWeeklyBudgetInfo(User user, LocalDate today) {
 
         // 💡 핵심: 남은 예산 중 이번 주가 차지하는 비율만큼만 예산 할당
         int totalWeekDays = (int) (endOfWeek.toEpochDay() - startOfWeek.toEpochDay() + 1);
-        long thisWeekBudgetAmount = remainingMonthlyBudget * totalWeekDays / remainingDays;
+        long thisWeekBudgetAmount = remainingDays > 0 ? remainingMonthlyBudget * totalWeekDays / remainingDays : 0;
 
         // 사용액 추정 = (이번주 지출 / 오늘까지 경과 일수) * (월요일~오늘 해당하는 일수)
         long thisWeekSpentAmount = expenseService.getTotalExpenseAmountForPeriod(user, startOfWeek, endOfWeek);
@@ -61,8 +61,12 @@ public UserHomeWeeklyBudgetDto getWeeklyBudgetInfo(User user, LocalDate today) {
         long scheduledExpenseAmount = 0L; // TODO: 추후 수정
 
         long thisWeekRemainingBudgetAmount = max(thisWeekBudgetAmount - thisWeekSpentAmount - scheduledExpenseAmount, 0L);
-        long dailyBudgetAmount = max((thisWeekRemainingBudgetAmount - scheduledExpenseAmount) / totalWeekDays, 0L);
-        int budgetUsagePercentage = max((int)(thisWeekSpentAmount * 100 / thisWeekBudgetAmount), 0);
+        long dailyBudgetAmount = max(totalWeekDays > 0 ? (thisWeekRemainingBudgetAmount - scheduledExpenseAmount) / totalWeekDays : 0, 0L);
+        int budgetUsagePercentage = Math.max(
+                thisWeekBudgetAmount > 0 ? (int)(thisWeekSpentAmount * 100 / thisWeekBudgetAmount) : 0,
+                0
+        );
+
 
         return UserHomeWeeklyBudgetDto.builder()
                 .remainingBudgetAmount(thisWeekRemainingBudgetAmount) // 이번 주 남은 예산 (오늘~일요일)
diff --git a/mooney/src/main/java/tamtam/mooney/domain/chat/service/ChatService.java b/mooney/src/main/java/tamtam/mooney/domain/chat/service/ChatService.java
index bdcd0b7..6170a7a 100644
--- a/mooney/src/main/java/tamtam/mooney/domain/chat/service/ChatService.java
+++ b/mooney/src/main/java/tamtam/mooney/domain/chat/service/ChatService.java
@@ -13,6 +13,8 @@
 import tamtam.mooney.domain.chat.dto.ChatMessage;
 import tamtam.mooney.domain.chat.dto.ChatRequestDto;
 import tamtam.mooney.domain.chat.dto.ChatResponseDto;
+import tamtam.mooney.domain.enums.ExpenseCategory;
+import tamtam.mooney.domain.transaction.service.ExpenseService;
 import tamtam.mooney.domain.transaction.service.TransactionService;
 import tamtam.mooney.domain.user.entity.User;
 import tamtam.mooney.domain.user.service.UserService;
@@ -36,7 +38,7 @@ public class ChatService {
     private final OpenAIService openAIService;
     private final MonthlyBudgetService monthlyBudgetService;
     private final CategoryBudgetService categoryBudgetService;
-    private final TransactionService transactionService;
+    private final ExpenseService expenseService;
     private final GenericRedisRepository<ChatMessage> chatRedisRepository;
 
     // 채팅 저장
@@ -85,12 +87,12 @@ public List<ChatBudgetInfoDto> getCategoryBudgetRemainingAmount(User user) {
         List<CategoryBudget> budgets = categoryBudgetService.findByMonthlyBudget(monthlyBudget);
 
         // 특정 기간 동안의 모든 카테고리별 총 지출
-        Map<String, Long> totalExpensesByCategory = transactionService.mapTotalExpenseForAllCategories(user, startOfMonth);
+        Map<ExpenseCategory, Long> totalExpensesByCategory = expenseService.mapTotalExpenseForAllCategories(user, startOfMonth);
 
         // 각 카테고리의 실제 지출 계산
         return budgets.stream()
                 .map(cb -> {
-                    Long spent = totalExpensesByCategory.getOrDefault(cb.getExpenseCategory().name(), 0L);
+                    Long spent = totalExpensesByCategory.getOrDefault(cb.getExpenseCategory(), 0L);
                     long remaining = Math.max(cb.getAmount() - spent, 0);
 
                     return new ChatBudgetInfoDto(
diff --git a/mooney/src/main/java/tamtam/mooney/domain/transaction/repository/ExpenseRepository.java b/mooney/src/main/java/tamtam/mooney/domain/transaction/repository/ExpenseRepository.java
index f5f6e09..c043a12 100644
--- a/mooney/src/main/java/tamtam/mooney/domain/transaction/repository/ExpenseRepository.java
+++ b/mooney/src/main/java/tamtam/mooney/domain/transaction/repository/ExpenseRepository.java
@@ -3,6 +3,7 @@
 import io.lettuce.core.dynamic.annotation.Param;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
+import tamtam.mooney.domain.enums.ExpenseCategory;
 import tamtam.mooney.domain.transaction.entity.Expense;
 import tamtam.mooney.domain.user.entity.User;
 
@@ -11,12 +12,12 @@
 import java.util.Map;
 
 public interface ExpenseRepository extends JpaRepository<Expense, Long> {
-    @Query("SELECT CAST(e.expenseCategory AS string), COALESCE(SUM(t.amount), 0) " +
+    @Query("SELECT e.expenseCategory, COALESCE(SUM(t.amount), 0) " +
             "FROM Expense e " +
             "JOIN Transaction t ON e.transactionId = t.transactionId " +
             "WHERE t.user = :user AND t.transactionTime BETWEEN :startOfMonth AND :endOfMonth " +
             "GROUP BY e.expenseCategory")
-    Map<String, Long> getTotalExpenseForAllCategories(
+    List<Object[]> getTotalExpenseForAllCategories(
             @Param("user") User user,
             @Param("startOfMonth") LocalDateTime startOfMonth,
             @Param("endOfMonth") LocalDateTime endOfMonth
diff --git a/mooney/src/main/java/tamtam/mooney/domain/transaction/service/ExpenseService.java b/mooney/src/main/java/tamtam/mooney/domain/transaction/service/ExpenseService.java
index a138253..2accc2a 100644
--- a/mooney/src/main/java/tamtam/mooney/domain/transaction/service/ExpenseService.java
+++ b/mooney/src/main/java/tamtam/mooney/domain/transaction/service/ExpenseService.java
@@ -1,6 +1,7 @@
 package tamtam.mooney.domain.transaction.service;
 
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import tamtam.mooney.domain.mission.repository.MissionRepository;
@@ -8,19 +9,25 @@
 import tamtam.mooney.domain.transaction.dto.ExpenseAddRequestDto;
 import tamtam.mooney.domain.transaction.entity.Expense;
 import tamtam.mooney.domain.enums.ExpenseCategory;
+import tamtam.mooney.domain.transaction.repository.ExpenseRepository;
 import tamtam.mooney.domain.transaction.repository.TransactionRepository;
 import tamtam.mooney.domain.user.entity.User;
 import tamtam.mooney.domain.user.service.UserService;
 
 import java.time.LocalDate;
 import java.time.LocalDateTime;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
 
+@Slf4j
 @Service
 @Transactional
 @RequiredArgsConstructor
 public class ExpenseService {
 
     private final TransactionRepository transactionRepository;
+    private final ExpenseRepository expenseRepository;
     private final UserService userService;
     // private final LlmCategoryClassifier llmCategoryClassifier;
     private final MissionRepository missionRepository;
@@ -58,4 +65,31 @@ public Long getTotalExpenseAmountForPeriod(User user, LocalDate startDate, Local
         LocalDateTime endDateTime = endDate.atTime(23, 59, 59);
         return transactionRepository.getTotalExpenseAmountForPeriod(user, startDateTime, endDateTime);
     }
+
+    @Transactional(readOnly = true)
+    public Map<ExpenseCategory, Long> mapTotalExpenseForAllCategories(User user, LocalDate startDate) {
+        LocalDateTime startOfMonth = startDate.atStartOfDay();
+        LocalDateTime endOfMonth = startDate.withDayOfMonth(startDate.lengthOfMonth()).atTime(23, 59, 59);
+        log.info("startOfMonth: " + startOfMonth + " / endOfMonth: " + endOfMonth);
+
+        // List<Object[]>로 쿼리 결과 받기
+        List<Object[]> rawResults = expenseRepository.getTotalExpenseForAllCategories(user, startOfMonth, endOfMonth);
+
+        // 수동 변환: Map<ExpenseCategory, Long>
+        Map<ExpenseCategory, Long> result = new HashMap<>();
+        for (Object[] row : rawResults) {
+            ExpenseCategory category = (ExpenseCategory) row[0];
+            Long amount = (Long) row[1];
+            result.put(category, amount);
+        }
+
+        // 전체 결과 출력
+        result.forEach((key, value) ->
+                log.info("카테고리: " + key.name() + " / 총 지출: " + value)
+        );
+
+        return result;
+    }
+
+
 }
diff --git a/mooney/src/main/java/tamtam/mooney/domain/transaction/service/TransactionService.java b/mooney/src/main/java/tamtam/mooney/domain/transaction/service/TransactionService.java
index 616cd51..614fb45 100644
--- a/mooney/src/main/java/tamtam/mooney/domain/transaction/service/TransactionService.java
+++ b/mooney/src/main/java/tamtam/mooney/domain/transaction/service/TransactionService.java
@@ -1,6 +1,7 @@
 package tamtam.mooney.domain.transaction.service;
 
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import tamtam.mooney.domain.transaction.dto.*;
@@ -13,7 +14,6 @@
 import tamtam.mooney.domain.user.service.UserService;
 
 import java.time.LocalDate;
-import java.time.LocalDateTime;
 import java.util.*;
 
 @Service
@@ -66,13 +66,6 @@ public MonthlyTransactionDayUnitDto getTransactionsByDate(LocalDate date) {
         return MonthlyTransactionDayUnitDto.from(date, totalIncomeAmount, totalExpenseAmount, expenses, incomes);
     }
 
-    @Transactional(readOnly = true)
-    public Map<String, Long> mapTotalExpenseForAllCategories(User user, LocalDate startDate) {
-        LocalDateTime startOfMonth = startDate.atStartOfDay();
-        LocalDateTime endOfMonth = startDate.withDayOfMonth(startDate.lengthOfMonth()).atTime(23, 59, 59);
-        return expenseRepository.getTotalExpenseForAllCategories(user, startOfMonth, endOfMonth);
-    }
-
     @Transactional(readOnly = true)
     public MonthlyTransactionResponseDto getTransactionsByMonth(int year, int month) {
         User user = userService.getCurrentUser();