diff --git a/MoneyMap/Pages/Upload.cshtml.cs b/MoneyMap/Pages/Upload.cshtml.cs
index f3ea167..8cbedd7 100644
--- a/MoneyMap/Pages/Upload.cshtml.cs
+++ b/MoneyMap/Pages/Upload.cshtml.cs
@@ -18,12 +18,14 @@ namespace MoneyMap.Pages
         private readonly MoneyMapContext _db;
         private readonly ITransactionImporter _importer;
         private readonly ITransactionCategorizer _categorizer;
+        private readonly ITransactionService _transactionService;
 
-        public UploadModel(MoneyMapContext db, ITransactionImporter importer, ITransactionCategorizer categorizer)
+        public UploadModel(MoneyMapContext db, ITransactionImporter importer, ITransactionCategorizer categorizer, ITransactionService transactionService)
         {
             _db = db;
             _importer = importer;
             _categorizer = categorizer;
+            _transactionService = transactionService;
         }
 
         [BindProperty] public IFormFile? Csv { get; set; }
@@ -183,7 +185,7 @@ namespace MoneyMap.Pages
                     }
 
                     // Check for duplicates
-                    if (!await IsDuplicate(txn))
+                    if (!await _transactionService.IsDuplicateAsync(txn))
                     {
                         transactionsToImport.Add(txn);
                     }
@@ -205,17 +207,6 @@ namespace MoneyMap.Pages
             return Page();
         }
 
-        private async Task<bool> IsDuplicate(Transaction txn)
-        {
-            return await _db.Transactions.AnyAsync(t =>
-                t.Date == txn.Date &&
-                t.Amount == txn.Amount &&
-                t.Name == txn.Name &&
-                t.Memo == txn.Memo &&
-                t.CardId == txn.CardId &&
-                t.AccountId == txn.AccountId);
-        }
-
         private bool ValidateInput()
         {
             if (Csv is null || Csv.Length == 0)
@@ -351,17 +342,6 @@ namespace MoneyMap.Pages
             return ImportOperationResult.Success(result);
         }
 
-        private async Task<bool> IsDuplicate(Transaction txn)
-        {
-            return await _db.Transactions.AnyAsync(t =>
-                t.Date == txn.Date &&
-                t.Amount == txn.Amount &&
-                t.Name == txn.Name &&
-                t.Memo == txn.Memo &&
-                t.CardId == txn.CardId &&
-                t.AccountId == txn.AccountId);
-        }
-
         private static Transaction MapToTransaction(TransactionCsvRow row, PaymentResolutionResult paymentResolution)
         {
             return new Transaction