diff --git a/frontend/src/components/analytics/MonthlyTrends.tsx b/frontend/src/components/analytics/MonthlyTrends.tsx
index b7cfb16..9432102 100644
--- a/frontend/src/components/analytics/MonthlyTrends.tsx
+++ b/frontend/src/components/analytics/MonthlyTrends.tsx
@@ -48,7 +48,7 @@ export default function MonthlyTrends({ className, days = 365 }: MonthlyTrendsPr
     const monthlyMap: { [key: string]: MonthlyData } = {};
     
     transactions.forEach((transaction) => {
-      const date = new Date(transaction.transaction_date);
+      const date = new Date(transaction.date);
       const monthKey = `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}`;
       
       if (!monthlyMap[monthKey]) {
@@ -63,10 +63,10 @@ export default function MonthlyTrends({ className, days = 365 }: MonthlyTrendsPr
         };
       }
       
-      if (transaction.transaction_value > 0) {
-        monthlyMap[monthKey].income += transaction.transaction_value;
+      if (transaction.amount > 0) {
+        monthlyMap[monthKey].income += transaction.amount;
       } else {
-        monthlyMap[monthKey].expenses += Math.abs(transaction.transaction_value);
+        monthlyMap[monthKey].expenses += Math.abs(transaction.amount);
       }
       
       monthlyMap[monthKey].net = monthlyMap[monthKey].income - monthlyMap[monthKey].expenses;
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index f7f621f..627e69d 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -2,6 +2,7 @@ import axios from "axios";
 import type {
   Account,
   Transaction,
+  AnalyticsTransaction,
   Balance,
   ApiResponse,
   NotificationSettings,
@@ -168,11 +169,11 @@ export const apiClient = {
   },
 
   // Get all transactions for analytics (no pagination)
-  getTransactionsForAnalytics: async (days?: number): Promise<Transaction[]> => {
+  getTransactionsForAnalytics: async (days?: number): Promise<AnalyticsTransaction[]> => {
     const queryParams = new URLSearchParams();
     if (days) queryParams.append("days", days.toString());
     
-    const response = await api.get<ApiResponse<Transaction[]>>(
+    const response = await api.get<ApiResponse<AnalyticsTransaction[]>>(
       `/transactions/analytics?${queryParams.toString()}`
     );
     return response.data.data;
diff --git a/frontend/src/types/api.ts b/frontend/src/types/api.ts
index 0514731..908cd24 100644
--- a/frontend/src/types/api.ts
+++ b/frontend/src/types/api.ts
@@ -59,6 +59,17 @@ export interface RawTransactionData {
   [key: string]: unknown; // Allow additional fields
 }
 
+// Type for analytics transaction data
+export interface AnalyticsTransaction {
+  transaction_id: string;
+  date: string;
+  description: string;
+  amount: number;
+  currency: string;
+  status: string;
+  account_id: string;
+}
+
 export interface Transaction {
   transaction_id: string; // NEW: stable bank-provided transaction ID
   internal_transaction_id: string | null; // OLD: unstable GoCardless ID