diff --git a/app/Http/Controllers/Api/V1/ExpectedExpenseController.php b/app/Http/Controllers/Api/V1/ExpectedExpenseController.php
index 468ddf9..14e6c6c 100644
--- a/app/Http/Controllers/Api/V1/ExpectedExpenseController.php
+++ b/app/Http/Controllers/Api/V1/ExpectedExpenseController.php
@@ -124,4 +124,18 @@ public function summary(Request $request)
 
         return ApiResponse::success($summary, __('message.fetched'));
     }
+
+    /**
+     * 대시보드 상세 조회 (CEO 대시보드 당월 예상 지출내역 모달용)
+     *
+     * @param  Request  $request  transaction_type 쿼리 파라미터 (purchase, card, bill, null=전체)
+     */
+    public function dashboardDetail(Request $request)
+    {
+        $transactionType = $request->query('transaction_type');
+
+        $data = $this->service->dashboardDetail($transactionType);
+
+        return ApiResponse::success($data, __('message.fetched'));
+    }
 }
diff --git a/app/Services/ExpectedExpenseService.php b/app/Services/ExpectedExpenseService.php
index 75f90ab..6569fef 100644
--- a/app/Services/ExpectedExpenseService.php
+++ b/app/Services/ExpectedExpenseService.php
@@ -299,4 +299,116 @@ public function summary(array $params): array
             'by_month' => $byMonth,
         ];
     }
+
+    /**
+     * 대시보드 상세 조회 (CEO 대시보드 당월 예상 지출내역 모달용)
+     *
+     * @param  string|null  $transactionType  거래유형 필터 (purchase, card, bill, null=전체)
+     * @return array{
+     *     summary: array{
+     *         total_amount: float,
+     *         previous_month_amount: float,
+     *         change_rate: float,
+     *         remaining_balance: float,
+     *         item_count: int
+     *     },
+     *     items: array,
+     *     footer_summary: array
+     * }
+     */
+    public function dashboardDetail(?string $transactionType = null): array
+    {
+        $tenantId = $this->tenantId();
+        $currentMonthStart = now()->startOfMonth()->toDateString();
+        $currentMonthEnd = now()->endOfMonth()->toDateString();
+        $previousMonthStart = now()->subMonth()->startOfMonth()->toDateString();
+        $previousMonthEnd = now()->subMonth()->endOfMonth()->toDateString();
+
+        // 기본 쿼리 빌더 (transaction_type 필터 적용)
+        $baseQuery = function () use ($tenantId, $transactionType) {
+            $query = ExpectedExpense::query()->where('tenant_id', $tenantId);
+            if ($transactionType) {
+                $query->where('transaction_type', $transactionType);
+            }
+
+            return $query;
+        };
+
+        // 1. 요약 정보
+        $currentMonthTotal = $baseQuery()
+            ->whereBetween('expected_payment_date', [$currentMonthStart, $currentMonthEnd])
+            ->sum('amount');
+
+        $currentMonthCount = $baseQuery()
+            ->whereBetween('expected_payment_date', [$currentMonthStart, $currentMonthEnd])
+            ->count();
+
+        $previousMonthTotal = $baseQuery()
+            ->whereBetween('expected_payment_date', [$previousMonthStart, $previousMonthEnd])
+            ->sum('amount');
+
+        $changeRate = $previousMonthTotal > 0
+            ? round((($currentMonthTotal - $previousMonthTotal) / $previousMonthTotal) * 100, 1)
+            : ($currentMonthTotal > 0 ? 100 : 0);
+
+        // 미지급 잔액 (pending 상태) - remaining_balance로 반환
+        $pendingBalance = $baseQuery()
+            ->where('payment_status', 'pending')
+            ->sum('amount');
+
+        // 2. 지출예상 목록 (당월, 지급일 순)
+        $itemsQuery = ExpectedExpense::query()
+            ->select([
+                'expected_expenses.id',
+                'expected_expenses.expected_payment_date',
+                'expected_expenses.description',
+                'expected_expenses.amount',
+                'expected_expenses.client_id',
+                'expected_expenses.client_name',
+                'expected_expenses.account_code',
+                'expected_expenses.payment_status',
+                'expected_expenses.transaction_type',
+            ])
+            ->leftJoin('clients', 'expected_expenses.client_id', '=', 'clients.id')
+            ->where('expected_expenses.tenant_id', $tenantId)
+            ->whereBetween('expected_expenses.expected_payment_date', [$currentMonthStart, $currentMonthEnd]);
+
+        if ($transactionType) {
+            $itemsQuery->where('expected_expenses.transaction_type', $transactionType);
+        }
+
+        $items = $itemsQuery
+            ->orderBy('expected_expenses.expected_payment_date', 'asc')
+            ->get()
+            ->map(function ($item) {
+                return [
+                    'id' => $item->id,
+                    'payment_date' => $item->expected_payment_date?->format('Y-m-d'),
+                    'item_name' => $item->description ?? '',
+                    'amount' => (float) $item->amount,
+                    'vendor_name' => $item->client_name ?? '',
+                    'account_title' => $item->account_code ?? '',
+                    'status' => $item->payment_status,
+                    'transaction_type' => $item->transaction_type,
+                ];
+            })
+            ->toArray();
+
+        // 3. 푸터 합계
+        $footerSummary = [
+            'total_amount' => (float) $currentMonthTotal,
+            'item_count' => count($items),
+        ];
+
+        return [
+            'summary' => [
+                'total_amount' => (float) $currentMonthTotal,
+                'previous_month_amount' => (float) $previousMonthTotal,
+                'change_rate' => $changeRate,
+                'remaining_balance' => (float) $pendingBalance,
+            ],
+            'items' => $items,
+            'footer_summary' => $footerSummary,
+        ];
+    }
 }