diff --git a/Schaad.Accounting.Common/Datasets/TransactionDataset.cs b/Schaad.Accounting.Common/Datasets/TransactionDataset.cs
index 7d28f92..b080b64 100644
--- a/Schaad.Accounting.Common/Datasets/TransactionDataset.cs
+++ b/Schaad.Accounting.Common/Datasets/TransactionDataset.cs
@@ -3,7 +3,7 @@ using Schaad.Accounting.Models;
 
 namespace Schaad.Accounting.Datasets
 {
-    public record TransactionDataset : Transaction
+    public class TransactionDataset : Transaction
     {
         public Account OriginAccount { get; set; }
 
diff --git a/Schaad.Accounting.Common/Models/Transaction.cs b/Schaad.Accounting.Common/Models/Transaction.cs
index dabbe07..8dc7ee0 100644
--- a/Schaad.Accounting.Common/Models/Transaction.cs
+++ b/Schaad.Accounting.Common/Models/Transaction.cs
@@ -5,7 +5,7 @@ using System.Linq;
 
 namespace Schaad.Accounting.Models
 {
-    public record Transaction
+    public class Transaction
     {
         public string Id { get; set; }
         public string BankTransactionId { get; set; }
diff --git a/Schaad.Accounting.Db/Repositories/TransactionRepository.cs b/Schaad.Accounting.Db/Repositories/TransactionRepository.cs
index 973cc92..8689e7d 100644
--- a/Schaad.Accounting.Db/Repositories/TransactionRepository.cs
+++ b/Schaad.Accounting.Db/Repositories/TransactionRepository.cs
@@ -30,6 +30,8 @@ namespace Schaad.Accounting.Repositories
         /// </summary>
         public void SaveTransaction(Transaction transaction)
         {
+            transaction.Value = Math.Abs(transaction.Value);
+            
             // prevent saving fxrate for chf account
             var isFxAccount = accountRepository.GetAccount(transaction.OriginAccountId).IsFxAccount;
 
diff --git a/Schaad.Accounting.Services/ViewService.cs b/Schaad.Accounting.Services/ViewService.cs
index aca1643..e60111d 100644
--- a/Schaad.Accounting.Services/ViewService.cs
+++ b/Schaad.Accounting.Services/ViewService.cs
@@ -169,7 +169,7 @@ namespace Schaad.Accounting.Services
                 
                 if (account.Class == ClassIds.Activa && accountId == t.OriginAccountId )
                 {
-                    return t with { Value = -t.Value };
+                    t.Value *= -1;
                 }
     
                 return t;
diff --git a/Schaad.Accounting.UI/Components/Pages/Controls/AccountSelector.razor b/Schaad.Accounting.UI/Components/Pages/Controls/AccountSelector.razor
new file mode 100644
index 0000000..dcbef09
--- /dev/null
+++ b/Schaad.Accounting.UI/Components/Pages/Controls/AccountSelector.razor
@@ -0,0 +1,7 @@
+<select @bind="@AccountId" @oninput="OnInputChanged">
+    <option value=""></option>
+    @foreach (var account in Accounts.OrderBy(a => a.Number).ThenBy(a => a.Name))
+    {
+        <option value="@account.Id">@($"{account.Number} / {account.Name}")</option>
+    }
+</select>
\ No newline at end of file
diff --git a/Schaad.Accounting.UI/Components/Pages/Controls/AccountSelector.razor.cs b/Schaad.Accounting.UI/Components/Pages/Controls/AccountSelector.razor.cs
new file mode 100644
index 0000000..900ff6c
--- /dev/null
+++ b/Schaad.Accounting.UI/Components/Pages/Controls/AccountSelector.razor.cs
@@ -0,0 +1,19 @@
+using Microsoft.AspNetCore.Components;
+using Schaad.Accounting.Models;
+
+namespace Schaad.Accounting.UI.Components.Pages.Controls;
+
+public partial class AccountSelector : ComponentBase
+{
+    [Parameter] public required string? AccountId { get; set; }
+    
+    [Parameter] public required IReadOnlyList<Account> Accounts { get; set; }
+
+    [Parameter] public EventCallback<string> AccountIdChanged { get; set; }
+
+    private async Task OnInputChanged(ChangeEventArgs e)
+    {
+        AccountId = e.Value?.ToString();
+        await AccountIdChanged.InvokeAsync(AccountId);
+    }
+}
\ No newline at end of file
diff --git a/Schaad.Accounting.UI/Components/Pages/Controls/AccountSelector.razor.css b/Schaad.Accounting.UI/Components/Pages/Controls/AccountSelector.razor.css
new file mode 100644
index 0000000..f83e867
--- /dev/null
+++ b/Schaad.Accounting.UI/Components/Pages/Controls/AccountSelector.razor.css
@@ -0,0 +1,5 @@
+select {
+    width: 100%;
+    height: 30px;
+    box-sizing: border-box;
+}
diff --git a/Schaad.Accounting.UI/Components/Pages/Dialogs/TransactionSplitDialog.razor b/Schaad.Accounting.UI/Components/Pages/Dialogs/TransactionSplitDialog.razor
new file mode 100644
index 0000000..03e7bc9
--- /dev/null
+++ b/Schaad.Accounting.UI/Components/Pages/Dialogs/TransactionSplitDialog.razor
@@ -0,0 +1,83 @@
+@implements IDialogContentComponent<Transaction>
+@rendermode InteractiveServer
+
+<FluentDialogHeader ShowDismiss="true">
+    <FluentStack VerticalAlignment="VerticalAlignment.Center">
+        <FluentIcon Value="@(new Icons.Regular.Size24.WindowApps())"/>
+        <FluentLabel Typo="Typography.PaneHeader">
+            @Dialog.Instance.Parameters.Title
+        </FluentLabel>
+    </FluentStack>
+</FluentDialogHeader>
+
+<FluentDialogBody>
+    Total: @Math.Abs(Content.Value) / Rest: @openAmount
+    <FluentButton Appearance="Appearance.Neutral" IconEnd="@(new Icons.Regular.Size24.Add())"
+                  OnClick="@AddTransactionAsync">
+        Transaktion hinzufügen
+    </FluentButton>
+    <EditForm EditContext="@editContext">
+        <DataAnnotationsValidator/>
+
+        <table>
+            <thead>
+            <tr>
+                <th>Datum</th>
+                <th>Betrag</th>
+                <th>Text</th>
+                <th>Konto</th>
+                <th></th>
+            </tr>
+            </thead>
+            <tbody>
+            @foreach (var transaction in transactionList)
+            {
+                <tr>
+                    <td>
+                        <div>@transaction.ValueDate.ToString("dd.MM.yyyy")</div>
+                    </td>
+                    <td>
+                        <div>
+                            <InputNumber @bind-Value="@transaction.Value" @onblur="CalculateOpenAmount"/>
+                        </div>
+                    </td>
+                    <td>
+                        <div class="text-column">
+                            <input list="texts" @bind="@transaction.Text" placeholder="Type or select..."/>
+                            <datalist id="texts">
+                                @foreach (var text in bookingTexts.OrderBy(t => t))
+                                {
+                                    <option value="@text"></option>
+                                }
+                            </datalist>
+                        </div>
+                    </td>
+                    <td>
+                        <div class="account-column">
+                            <AccountSelector Accounts="accounts" @bind-AccountId="@transaction.TargetAccountId" />
+                        </div>
+                    </td>
+                    <td style="align-content: center">
+                        <FluentButton IconEnd="@(new Icons.Regular.Size16.Delete())" Appearance="Appearance.Neutral"
+                                      OnClick="@(() => transactionList.Remove(transaction))"/>
+                    </td>
+                </tr>
+            }
+            </tbody>
+        </table>
+        <div>
+            <FluentValidationSummary/>
+        </div>
+    </EditForm>
+</FluentDialogBody>
+
+<FluentDialogFooter>
+    <FluentButton Appearance="Appearance.Neutral"
+                  OnClick="@CancelAsync">
+        Abbrechen
+    </FluentButton>
+    <FluentButton Appearance="Appearance.Accent" Disabled="@(openAmount != 0)"
+                  OnClick="@SaveAsync">
+        Speichern
+    </FluentButton>
+</FluentDialogFooter>
\ No newline at end of file
diff --git a/Schaad.Accounting.UI/Components/Pages/Dialogs/TransactionSplitDialog.razor.cs b/Schaad.Accounting.UI/Components/Pages/Dialogs/TransactionSplitDialog.razor.cs
new file mode 100644
index 0000000..25d0925
--- /dev/null
+++ b/Schaad.Accounting.UI/Components/Pages/Dialogs/TransactionSplitDialog.razor.cs
@@ -0,0 +1,87 @@
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.Forms;
+using Microsoft.FluentUI.AspNetCore.Components;
+using Schaad.Accounting.Datasets;
+using Schaad.Accounting.Interfaces;
+using Schaad.Accounting.Models;
+
+namespace Schaad.Accounting.UI.Components.Pages.Dialogs;
+
+public partial class TransactionSplitDialog : ComponentBase
+{
+    private EditContext editContext = null!;
+
+    [CascadingParameter]
+    public FluentDialog Dialog { get; set; } = null!;
+
+    [Parameter]
+    public Transaction Content { get; set; } = null!;
+    
+    [Inject]
+    private ITransactionRepository transactionRepository { get; set; } = null!;
+    
+    [Inject]
+    private IBankTransactionRepository bankTransactionRepository { get; set; } = null!;
+    
+    [Inject]
+    private IAccountRepository accountRepository { get; set; } = null!;
+    
+    [Inject]
+    private IBookingTextRepository bookingTextRepository { get; set; } = null!;
+    
+    [Inject]
+    private IViewService viewService { get; set; } = null!;
+    
+    private List<Transaction> transactionList = new();
+    private IReadOnlyList<AccountDataset> accounts = null!;
+    private IReadOnlyList<string> bookingTexts = [];
+    private decimal openAmount = 0;
+    
+
+    protected override void OnInitialized()
+    {
+        accounts = viewService.GetAccountViewList();
+        bookingTexts = bookingTextRepository.GetBookingTextList().Select(b => b.Text).ToArray();
+        var accountList = accountRepository.GetAccountList();
+        var bankTrx = bankTransactionRepository.GetBankTransaction(Content.BankTransactionId);
+        var trx = new Transaction(bankTrx, accountList);
+        trx.Value = Math.Abs(bankTrx.Value);
+        transactionList.Add(trx);
+        editContext = new EditContext(trx);
+    }
+    
+    private async Task AddTransactionAsync()
+    {
+        transactionList.Add(new Transaction
+        {
+            ValueDate = Content.ValueDate,
+            BookingDate = Content.BookingDate,
+            OriginAccountId = Content.OriginAccountId,
+            Value = 0
+        });
+        
+        await Task.CompletedTask;
+    }
+
+    private void CalculateOpenAmount()
+    {
+        openAmount = Content.Value + transactionList.Sum(t => t.Value);
+    }
+
+    private async Task SaveAsync()
+    {
+        if (editContext.Validate())
+        {
+            foreach (var transtaction in transactionList)
+            {
+                transactionRepository.SaveTransaction(transtaction);
+            }
+            await Dialog.CloseAsync(Content);
+        }
+    }
+
+    private async Task CancelAsync()
+    {
+        await Dialog.CancelAsync();
+    }
+}
\ No newline at end of file
diff --git a/Schaad.Accounting.UI/Components/Pages/Dialogs/TransactionSplitDialog.razor.css b/Schaad.Accounting.UI/Components/Pages/Dialogs/TransactionSplitDialog.razor.css
new file mode 100644
index 0000000..bad5d5f
--- /dev/null
+++ b/Schaad.Accounting.UI/Components/Pages/Dialogs/TransactionSplitDialog.razor.css
@@ -0,0 +1,10 @@
+th:nth-child(1), td:nth-child(1) { width: 100px; }
+th:nth-child(2), td:nth-child(2) { width: 50px; }
+th:nth-child(3), td:nth-child(3) { width: 200px; }
+th:nth-child(4), td:nth-child(4) { width: 200px; }
+th:nth-child(5), td:nth-child(5) { width: 40px; text-align: center; }
+
+.text-column input {
+    width: 100%;
+    box-sizing: border-box;
+}
\ No newline at end of file
diff --git a/Schaad.Accounting.UI/Components/Pages/Home.razor b/Schaad.Accounting.UI/Components/Pages/Home.razor
index 2b95793..a38be25 100644
--- a/Schaad.Accounting.UI/Components/Pages/Home.razor
+++ b/Schaad.Accounting.UI/Components/Pages/Home.razor
@@ -12,18 +12,20 @@
                  MaximumFileSize="@(10 * 1024 * 1024)"
                  Accept=".zip, .xml"
                  OnProgressChange="@OnProgressChangeAsync"
-                 OnCompleted="@OnCompletedAsync" />
+                 OnCompleted="@OnCompletedAsync"/>
 
-<FluentProgress Visible="@(progressPercent > 0)" Min="0" Max="100" Value="@progressPercent" />
+<FluentProgress Visible="@(progressPercent > 0)" Min="0" Max="100" Value="@progressPercent"/>
 <FluentLabel Alignment="HorizontalAlignment.Center">
     @progressTitle
 </FluentLabel>
 
-<FluentButton Appearance="Appearance.Lightweight" IconStart="@(new Icons.Regular.Size16.ArrowUpload())" Id="MyUploadBuffer">
+<FluentButton Appearance="Appearance.Lightweight" IconStart="@(new Icons.Regular.Size16.ArrowUpload())"
+              Id="MyUploadBuffer">
     Upload files
 </FluentButton>
 
-<FluentButton Appearance="Appearance.Lightweight" IconStart="@(new Icons.Regular.Size16.Dismiss())" @onclick="@((e) => IsCanceled = true)">
+<FluentButton Appearance="Appearance.Lightweight" IconStart="@(new Icons.Regular.Size16.Dismiss())"
+              @onclick="@((e) => IsCanceled = true)">
     Cancel
 </FluentButton>
 
@@ -38,10 +40,10 @@ else
         <tr>
             <th>Buchungsdatum</th>
             <th>Valutadatum</th>
-            <th>Text</th>
             <th>Betrag</th>
-            <th>Konto</th>
             <th>Zusatzinfo</th>
+            <th>Text</th>
+            <th>Konto</th>
             <th></th>
             <th></th>
         </tr>
@@ -51,9 +53,17 @@ else
         {
             <tr>
                 <td>
-                    <div>@transaction.BookingDate.ToString("dd.MM.yyyy")</div></td>
+                    <div>@transaction.BookingDate.ToString("dd.MM.yyyy")</div>
+                </td>
                 <td>
-                    <div>@transaction.ValueDate.ToString("dd.MM.yyyy")</div></td>
+                    <div>@transaction.ValueDate.ToString("dd.MM.yyyy")</div>
+                </td>
+                <td class="betrag-column">
+                    <div>@Math.Abs(transaction.Value).ToFormattedString()</div>
+                </td>
+                <td class="zusatzinfo-column" title="@transaction.BankTransactionText">
+                    <div>@transaction.BankTransactionText</div>
+                </td>
                 <td>
                     <div class="text-column">
                         <input list="texts" @bind="@transaction.Text" placeholder="Type or select..."/>
@@ -65,23 +75,24 @@ else
                         </datalist>
                     </div>
                 </td>
-                <td class="betrag-column">
-                    <div>@transaction.Value.ToFormattedString()</div>
-                </td>
                 <td>
-                    <select @bind="@transaction.TargetAccountId">
-                        <option value=""></option>
-                        @foreach (var account in accounts.OrderBy(a => a.Number).ThenBy(a => a.Name))
-                        {
-                            <option value="@account.Id">@($"{account.Number} / {@account.Name}")</option>
-                        }
-                    </select>
+                    @if (transaction.Value > 0)
+                    {
+                        <AccountSelector Accounts="accounts" @bind-AccountId="@transaction.OriginAccountId" />
+                    }
+                    else
+                    {
+                        <AccountSelector Accounts="accounts" @bind-AccountId="@transaction.TargetAccountId" />
+                    }
                 </td>
-                <td class="zusatzinfo-column" title="@transaction.BankTransactionText">
-                    <div>@transaction.BankTransactionText</div>
+                <td style="align-content: center">
+                    <FluentButton IconEnd="@(new Icons.Regular.Size16.SplitVertical())" Appearance="Appearance.Neutral"
+                                  OnClick="@(() => SplitBankTransactionAsync(transaction))" Disabled="@(transaction.Value > 0)"/>
+                </td>
+                <td style="align-content: center">
+                    <FluentButton IconEnd="@(new Icons.Regular.Size16.Save())" Appearance="Appearance.Neutral"
+                                  OnClick="@(() => BookBankTransactionAsync(transaction))"/>
                 </td>
-                <td style="align-content: center"><FluentButton IconEnd="@(new Icons.Regular.Size16.SplitVertical())" Appearance="Appearance.Neutral" OnClick="@(() => SplitBankTransactionAsync(transaction))"/></td>
-                <td style="align-content: center"><FluentButton IconEnd="@(new Icons.Regular.Size16.Save())" Appearance="Appearance.Neutral" OnClick="@(() => BookBankTransactionAsync(transaction))"/></td>
             </tr>
         }
         </tbody>
diff --git a/Schaad.Accounting.UI/Components/Pages/Home.razor.cs b/Schaad.Accounting.UI/Components/Pages/Home.razor.cs
index 65b0ab4..a4f9e8f 100644
--- a/Schaad.Accounting.UI/Components/Pages/Home.razor.cs
+++ b/Schaad.Accounting.UI/Components/Pages/Home.razor.cs
@@ -5,6 +5,7 @@ using Microsoft.FluentUI.AspNetCore.Components;
 using Schaad.Accounting.Datasets;
 using Schaad.Accounting.Interfaces;
 using Schaad.Accounting.Models;
+using Schaad.Accounting.UI.Components.Pages.Dialogs;
 
 namespace Schaad.Accounting.UI.Components.Pages;
 
@@ -19,6 +20,9 @@ public partial class Home : ComponentBase
     [Inject]
     private IMessageService messageService { get; set; } = null!;
     
+    [Inject]
+    private IDialogService dialogService { get; set; } = null!;
+    
     [Inject]
     private ISettingsService settingsService { get; set; } = null!;
     
@@ -166,7 +170,20 @@ public partial class Home : ComponentBase
     
     private async Task SplitBankTransactionAsync(Transaction transaction)
     {
-        ShowToast("Split noch nicht implementiert!", ToastIntent.Warning);
-        await Task.CompletedTask;
+        var dialog = await dialogService.ShowDialogAsync<TransactionSplitDialog>(transaction, new DialogParameters()
+        {
+            Height = "500px",
+            Width = "800px",
+            Title = "Split Transaktion",
+            PreventDismissOnOverlayClick = true,
+            PreventScroll = true,
+        });
+
+        var result = await dialog.Result;
+        if (!result.Cancelled && result.Data != null)
+        {
+            matchingBankTransactions!.RemoveAll(q => q == transaction);
+            await Task.CompletedTask;
+        }
     }
 }
diff --git a/Schaad.Accounting.UI/Components/Pages/Home.razor.css b/Schaad.Accounting.UI/Components/Pages/Home.razor.css
index f98d341..e8088fd 100644
--- a/Schaad.Accounting.UI/Components/Pages/Home.razor.css
+++ b/Schaad.Accounting.UI/Components/Pages/Home.razor.css
@@ -16,16 +16,17 @@ th {
     background-color: #f8f8f8;
 }
 
-th:nth-child(1), td:nth-child(1) { width: 120px; }  /* Buchungsdatum */
-th:nth-child(2), td:nth-child(2) { width: 120px; }  /* Valutadatum */
-th:nth-child(3), td:nth-child(3) { width: 240px; }  /* Text */
-th:nth-child(4), td:nth-child(4) { width: 100px; text-align: right; }  /* Betrag */
-th:nth-child(5), td:nth-child(5) { width: 300px; }  /* Konto */
+th:nth-child(1), td:nth-child(1) { width: 120px; }
+th:nth-child(2), td:nth-child(2) { width: 120px; }
+th:nth-child(3), td:nth-child(3) { width: 100px; text-align: right; }
+th:nth-child(5), td:nth-child(5) { width: 240px; }
+th:nth-child(6), td:nth-child(6) { width: 300px; }
 th:nth-child(7), td:nth-child(7),
-th:nth-child(8), td:nth-child(8) { width: 40px; text-align: center; }  /* Buttons */
+th:nth-child(8), td:nth-child(8) { width: 40px; text-align: center; }
 
 .text-column input {
     width: 100%;
+    height: 30px;
     box-sizing: border-box; /* Ensures padding/border doesn't overflow */
 }
 
diff --git a/Schaad.Accounting.UI/Components/_Imports.razor b/Schaad.Accounting.UI/Components/_Imports.razor
index 1c85a1a..5631017 100644
--- a/Schaad.Accounting.UI/Components/_Imports.razor
+++ b/Schaad.Accounting.UI/Components/_Imports.razor
@@ -13,6 +13,7 @@
 @using Plotly.Blazor
 @using Schaad.Accounting.UI
 @using Schaad.Accounting.UI.Components
+@using Schaad.Accounting.UI.Components.Pages.Controls
 @using Schaad.Accounting.Models
 @using Schaad.Accounting.Interfaces