refactor(app): add SkiaSharp and SkiaSharp.HarfBuzz package references

src/Duempelkas.App/Components/Dialogs/AddTransferDialog.razor

@@ -27,7 +27,7 @@
 
         <div class="d-flex justify-content-end gap-2">
             <button class="btn btn-success" @onclick="Save"
-                    disabled="@(!CanSave)"><i class="bi bi-arrow-left-right"></i> @(EditEntry != null ? "Speichern" : "Umbuchen")</button>
+                    disabled="@(!CanSave)"><i class="bi bi-arrow-left-right"></i> @(EditEntry != null ? "Speichern" : "Hinzufügen")</button>
             <button class="btn btn-outline-secondary" @onclick="Cancel"><i class="bi bi-x-lg"></i> Abbrechen</button>
         </div>
     </div>

src/Duempelkas.App/Components/Layout/MainLayout.razor

@@ -22,7 +22,7 @@
         <div class="dialog-content" @onclick:stopPropagation="true">
             <h5>Über Dümpelkas &middot; Version @AppVersion</h5>
             <p class="mb-2">Entwickler: Andre Beging</p>
-            <p class="mb-3">E-Mail: <a href="mailto:mail@beging.de" style="color: white;">mail@beging.de</a></p>
+            <p class="mb-3">E-Mail: <a href="mailto:mail@beging.de" style="color: var(--color-text);">mail@beging.de</a></p>
             <div class="d-flex justify-content-end">
                 <button type="button" class="btn btn-outline-secondary" @onclick="CloseAboutDialog">
                     <i class="bi bi-x-lg"></i> Schließen

src/Duempelkas.App/Pages/Accounts/AccountDetail.razor

@@ -39,8 +39,8 @@
                 <i class="bi bi-file-earmark-pdf"></i> PDF
             </button>
             |
-            <button class="btn btn-nav @(showCurrentYearOnly ? "btn-primary" : "btn-outline-secondary")" @onclick="ToggleYearFilter">
-                <i class="bi bi-funnel"></i> @(showCurrentYearOnly ? $"Nur {DateTime.Now.Year}" : "Alle Buchungen")
+            <button class="btn btn-nav btn-primary" @onclick="OpenYearFilterDialog">
+                <i class="bi bi-funnel"></i> Ansicht<br>@GetFilterLabel()
             </button>
         </div>
 
@@ -56,21 +56,21 @@
                     </div>
                     <div class="text-end">
                         <small class="text-muted">Einnahmen</small>
-                        <div class="amount-positive">@FormatAmount(showCurrentYearOnly ? balance.CurrentYearIncome : balance.TotalIncome)</div>
+                        <div class="amount-positive">@FormatAmount(selectedYear.HasValue ? balance.CurrentYearIncome : balance.TotalIncome)</div>
                     </div>
                     <div class="text-end">
                         <small class="text-muted">Ausgaben</small>
-                        <div class="amount-negative">@FormatAmount(showCurrentYearOnly ? balance.CurrentYearExpense : balance.TotalExpense)</div>
+                        <div class="amount-negative">@FormatAmount(selectedYear.HasValue ? balance.CurrentYearExpense : balance.TotalExpense)</div>
                     </div>
                 </div>
             </div>
 
-            @if (showCurrentYearOnly)
+            @if (selectedYear.HasValue)
             {
                 <div class="summary-section">
                     <div class="summary-flex">
                         <div>
-                            <small class="text-muted">Übertrag von @(DateTime.Now.Year - 1)</small>
+                            <small class="text-muted">Übertrag von @(selectedYear.Value - 1)</small>
                             <div class="d-flex align-items-center gap-1">
                                 <span class="fw-bold">@FormatAmount(balance.CarryoverBalance)</span>
                                 <button class="btn-edit-pen" @onclick="() => showEditCarryover = true" title="Übertrag bearbeiten">
@@ -79,7 +79,7 @@
                             </div>
                         </div>
                         <div class="text-end">
-                            <small class="text-muted">Umsätze @DateTime.Now.Year</small>
+                            <small class="text-muted">Umsätze @selectedYear.Value</small>
                             <div class="fw-bold @(balance.CurrentYearIncome - balance.CurrentYearExpense >= 0 ? "amount-positive" : "amount-negative")">
                                 @FormatAmount(balance.CurrentYearIncome - balance.CurrentYearExpense)
                             </div>
@@ -179,3 +179,29 @@
                        OnCancel="() => editingTransferEntry = null" />
 }
 
+@if (showYearFilterDialog)
+{
+    <div class="dialog-backdrop" @onclick="CloseYearFilterDialog">
+        <div class="dialog-content" @onclick:stopPropagation="true">
+            <h5>Filter auswählen</h5>
+            <p class="text-muted mb-3">Wähle ein Jahr oder alle Buchungen.</p>
+            <div class="filter-options-grid">
+                <button class="btn @(selectedYear.HasValue ? "btn-outline-secondary" : "btn-primary")" @onclick="() => SelectFilterYear(null)">
+                    Alle Buchungen
+                </button>
+                @foreach (var year in availableYears)
+                {
+                    <button class="btn @(selectedYear == year ? "btn-primary" : "btn-outline-secondary")" @onclick="() => SelectFilterYear(year)">
+                        @year
+                    </button>
+                }
+            </div>
+            <div class="d-flex justify-content-end mt-3">
+                <button class="btn btn-outline-secondary" @onclick="CloseYearFilterDialog">
+                    <i class="bi bi-x-lg"></i> Schließen
+                </button>
+            </div>
+        </div>
+    </div>
+}
+

src/Duempelkas.App/Pages/Accounts/AccountDetail.razor.cs

@@ -21,7 +21,9 @@ public partial class AccountDetail
     private bool showAddTransfer;
     private bool showEditName;
     private bool showEditCarryover;
-    private bool showCurrentYearOnly = true;
+    private bool showYearFilterDialog;
+    private int? selectedYear = DateTime.Now.Year;
+    private List<int> availableYears = [];
 
     private int? confirmDeleteEntryId;
     private string? confirmDeleteEntryTitle;
@@ -56,14 +58,26 @@ public partial class AccountDetail
     private async Task LoadAll()
     {
         account = await AccountService.GetAccountAsync(AccountId);
-        balance = await BalanceQueryService.GetAccountBalanceAsync(AccountId);
-        entries = await EntryService.GetEntriesAsync(AccountId, showCurrentYearOnly);
+        balance = await BalanceQueryService.GetAccountBalanceAsync(AccountId, selectedYear);
+        entries = await EntryService.GetEntriesAsync(AccountId, selectedYear);
+        availableYears = await EntryService.GetEntryYearsAsync(AccountId);
     }
 
-    private async Task ToggleYearFilter()
+    private void OpenYearFilterDialog()
     {
-        showCurrentYearOnly = !showCurrentYearOnly;
-        entries = await EntryService.GetEntriesAsync(AccountId, showCurrentYearOnly);
+        showYearFilterDialog = true;
+    }
+
+    private void CloseYearFilterDialog()
+    {
+        showYearFilterDialog = false;
+    }
+
+    private async Task SelectFilterYear(int? year)
+    {
+        selectedYear = year;
+        showYearFilterDialog = false;
+        await LoadAll();
     }
 
     #endregion
@@ -79,7 +93,7 @@ public partial class AccountDetail
 
     private async Task HandleSaveCarryover(decimal newAmount)
     {
-        await AccountService.UpdateCarryoverAsync(AccountId, newAmount);
+        await AccountService.UpdateCarryoverAsync(AccountId, newAmount, selectedYear);
         showEditCarryover = false;
         await LoadAll();
     }
@@ -164,8 +178,8 @@ public partial class AccountDetail
 
     private async Task HandleExport()
     {
-        var pdf = await PdfStatementService.GenerateStatementAsync(AccountId, showCurrentYearOnly);
-        var suffix = showCurrentYearOnly ? $"_{DateTime.Now.Year}" : "_Gesamt";
+        var pdf = await PdfStatementService.GenerateStatementAsync(AccountId, selectedYear);
+        var suffix = selectedYear.HasValue ? $"_{selectedYear.Value}" : "_Gesamt";
         savedPdfPath = await FileSaveService.SaveFileAsync(pdf, $"{account?.Name}{suffix}.pdf");
     }
 
@@ -190,5 +204,7 @@ public partial class AccountDetail
 
     private static string FormatAmount(decimal amount) => $"{amount:N2} €";
 
+    private string GetFilterLabel() => selectedYear?.ToString() ?? "Alle";
+
     #endregion
 }

src/Duempelkas.App/Pages/Dashboard.razor

@@ -4,6 +4,7 @@
 @inject ISettingsService SettingsService
 @inject IPdfStatementService PdfStatementService
 @inject IFileSaveService FileSaveService
+@inject IEntryService EntryService
 @inject NavigationManager NavigationManager
 
 <div class="container-fluid">
@@ -34,6 +35,13 @@
         <button class="btn-nav btn-dark" @onclick="HandleDashboardExportAsync">
             <i class="bi bi-file-earmark-pdf"></i> PDF
         </button>
+        |
+        <button class="btn btn-nav btn-primary" @onclick="OpenYearFilterDialog">
+            <i class="bi bi-funnel"></i> Ansicht<br>@GetFilterLabel()
+        </button>
+        <button class="btn btn-nav btn-secondary" @onclick="ToggleThemeAsync" title="Farbmodus wechseln">
+            <i class="@ThemeButtonIconClass"></i> Modus<br>@ThemeButtonLabel
+        </button>
     </div>
 
     @if (accounts != null && accounts.Any())
@@ -107,3 +115,29 @@
                    OnCancel="CancelRestoreConfirm" />
 }
 
+@if (showYearFilterDialog)
+{
+    <div class="dialog-backdrop" @onclick="CloseYearFilterDialog">
+        <div class="dialog-content" @onclick:stopPropagation="true">
+            <h5>Filter auswählen</h5>
+            <p class="text-muted mb-3">Wähle ein Jahr oder alle Buchungen.</p>
+            <div class="filter-options-grid">
+                <button class="btn @(selectedYear.HasValue ? "btn-outline-secondary" : "btn-primary")" @onclick="() => SelectFilterYear(null)">
+                    Alle Buchungen
+                </button>
+                @foreach (var year in availableYears)
+                {
+                    <button class="btn @(selectedYear == year ? "btn-primary" : "btn-outline-secondary")" @onclick="() => SelectFilterYear(year)">
+                        @year
+                    </button>
+                }
+            </div>
+            <div class="d-flex justify-content-end mt-3">
+                <button class="btn btn-outline-secondary" @onclick="CloseYearFilterDialog">
+                    <i class="bi bi-x-lg"></i> Schließen
+                </button>
+            </div>
+        </div>
+    </div>
+}
+

src/Duempelkas.App/Pages/Dashboard.razor.cs

@@ -1,5 +1,7 @@
 using System.Globalization;
 using Duempelkas.App.Services.Models;
+using Microsoft.AspNetCore.Components;
+using Microsoft.JSInterop;
 
 namespace Duempelkas.App.Pages;
 
@@ -11,10 +13,14 @@ public partial class Dashboard
     private bool showAddAccount;
     private bool showEditClubName;
     private bool showRestoreConfirm;
+    private bool showYearFilterDialog;
+    private int? selectedYear = DateTime.Now.Year;
+    private List<int> availableYears = [];
     private string clubName = string.Empty;
     private string? operationMessage;
     private string operationMessageClass = "alert-info";
     private string? savedPdfPath;
+    private string currentTheme = "light";
 
     #endregion
 
@@ -31,16 +37,42 @@ public partial class Dashboard
     protected override async Task OnInitializedAsync()
     {
         await LoadClubName();
-        await LoadAccounts();
+        await LoadAll();
+    }
+
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (!firstRender)
+        {
+            return;
+        }
+
+        try
+        {
+            currentTheme = await JS.InvokeAsync<string>("duempelkasThemeGetCurrentTheme");
+        }
+        catch (JSException)
+        {
+            // Keep default light mode when JS interop is not ready or unavailable.
+            currentTheme = "light";
+        }
+
+        StateHasChanged();
     }
 
     #endregion
 
     #region Data Loading
 
+    private async Task LoadAll()
+    {
+        await LoadAccounts();
+        availableYears = await EntryService.GetAllEntryYearsAsync();
+    }
+
     private async Task LoadAccounts()
     {
-        accounts = await AccountService.GetAllAccountsAsync();
+        accounts = await AccountService.GetAllAccountsAsync(selectedYear);
     }
 
     private async Task LoadClubName()
@@ -56,7 +88,7 @@ public partial class Dashboard
     {
         await AccountService.CreateAccountAsync(name);
         showAddAccount = false;
-        await LoadAccounts();
+        await LoadAll();
     }
 
     private async Task HandleSaveClubName(string newName)
@@ -104,8 +136,26 @@ public partial class Dashboard
 
     private async Task HandleDashboardExportAsync()
     {
-        var pdf = await PdfStatementService.GenerateDashboardStatementAsync();
-        savedPdfPath = await FileSaveService.SaveFileAsync(pdf, $"{DisplayClubName}_Übersicht.pdf");
+        var pdf = await PdfStatementService.GenerateDashboardStatementAsync(selectedYear);
+        var suffix = selectedYear.HasValue ? $"_{selectedYear.Value}" : "_Gesamt";
+        savedPdfPath = await FileSaveService.SaveFileAsync(pdf, $"{DisplayClubName}_Übersicht{suffix}.pdf");
+    }
+
+    private void OpenYearFilterDialog()
+    {
+        showYearFilterDialog = true;
+    }
+
+    private void CloseYearFilterDialog()
+    {
+        showYearFilterDialog = false;
+    }
+
+    private async Task SelectFilterYear(int? year)
+    {
+        selectedYear = year;
+        showYearFilterDialog = false;
+        await LoadAll();
     }
 
     private async Task HandleOpenSavedPdf()
@@ -138,5 +188,26 @@ public partial class Dashboard
         return amount.ToString("N2", CultureInfo.GetCultureInfo("de-DE")) + " €";
     }
 
+    private string GetFilterLabel() => selectedYear?.ToString() ?? "Alle";
+
+    private string ThemeButtonLabel => currentTheme == "dark" ? "Hell" : "Dunkel";
+
+    private string ThemeButtonIconClass => currentTheme == "dark" ? "bi bi-sun" : "bi bi-moon-stars";
+
+    private async Task ToggleThemeAsync()
+    {
+        try
+        {
+            currentTheme = await JS.InvokeAsync<string>("duempelkasThemeToggleTheme");
+        }
+        catch (JSException)
+        {
+            currentTheme = currentTheme == "dark" ? "light" : "dark";
+        }
+    }
+
+    [Inject]
+    private IJSRuntime JS { get; set; } = default!;
+
     #endregion
 }

src/Duempelkas.App/Services/IAccountService.cs

@@ -5,9 +5,11 @@ namespace Duempelkas.App.Services;
 public interface IAccountService
 {
     Task<List<AccountSummaryDto>> GetAllAccountsAsync();
+    Task<List<AccountSummaryDto>> GetAllAccountsAsync(int? year);
     Task<AccountSummaryDto> GetAccountAsync(int accountId);
     Task<AccountSummaryDto> CreateAccountAsync(string name);
     Task RenameAccountAsync(int accountId, string newName);
     Task UpdateCarryoverAsync(int accountId, decimal carryoverBalance);
+    Task UpdateCarryoverAsync(int accountId, decimal carryoverBalance, int? year);
     Task DeleteAccountAsync(int accountId);
 }

src/Duempelkas.App/Services/IBalanceQueryService.cs

@@ -4,5 +4,5 @@ namespace Duempelkas.App.Services;
 
 public interface IBalanceQueryService
 {
-    Task<AccountBalanceDto> GetAccountBalanceAsync(int accountId);
+    Task<AccountBalanceDto> GetAccountBalanceAsync(int accountId, int? year = null);
 }

src/Duempelkas.App/Services/IEntryService.cs

@@ -5,7 +5,10 @@ namespace Duempelkas.App.Services;
 
 public interface IEntryService
 {
+    Task<List<EntryDto>> GetEntriesAsync(int accountId, int? year);
     Task<List<EntryDto>> GetEntriesAsync(int accountId, bool currentYearOnly);
+    Task<List<int>> GetEntryYearsAsync(int accountId);
+    Task<List<int>> GetAllEntryYearsAsync();
     Task<EntryDto> CreateEntryAsync(int accountId, EntryType type, DateTime date, string title, decimal amount);
     Task CreateTransferAsync(int sourceAccountId, int targetAccountId, DateTime date, string title, decimal amount);
     Task DeleteEntryAsync(int entryId);

src/Duempelkas.App/Services/IPdfStatementService.cs

@@ -2,6 +2,8 @@ namespace Duempelkas.App.Services;
 
 public interface IPdfStatementService
 {
+    Task<byte[]> GenerateStatementAsync(int accountId, int? year);
     Task<byte[]> GenerateStatementAsync(int accountId, bool currentYearOnly);
     Task<byte[]> GenerateDashboardStatementAsync();
+    Task<byte[]> GenerateDashboardStatementAsync(int? year);
 }

src/Duempelkas.Desktop/wwwroot/css/app.css

@@ -1,9 +1,19 @@
-/* Duempelkas App Styles – Dark Mode */
+/* Duempelkas App Styles */
 
 :root {
     --color-income: #4ade80;
     --color-expense: #f87171;
     --color-transfer: #60a5fa;
+    --color-bg: #ddd;
+    --color-surface: #ffffff;
+    --color-surface-hover: #f1f5f9;
+    --color-border: #d9e2ef;
+    --color-text: #0f172a;
+    --color-text-muted: #64748b;
+    --color-accent: #4f46e5;
+}
+
+html[data-ui-theme="dark"] {
     --color-bg: #1a1a2e;
     --color-surface: #16213e;
     --color-surface-hover: #1e2d4a;
@@ -138,6 +148,16 @@ html, body {
     margin-bottom: 0.5rem !important;
 }
 
+.filter-options-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
+    gap: 0.5rem;
+}
+
+.filter-options-grid .btn {
+    justify-content: center;
+}
+
 /* Navbar */
 .app-navbar {
     background-color: var(--color-surface);
@@ -301,7 +321,7 @@ html, body {
 .btn-dark {
     background-color: #334155;
     border-color: #475569;
-    color: var(--color-text);
+    color: #f8fafc;
 }
 
 .btn-dark:hover {
@@ -309,6 +329,12 @@ html, body {
     border-color: #64748b;
 }
 
+html[data-ui-theme="light"] .btn-dark {
+    background-color: #334155;
+    border-color: #334155;
+    color: #f8fafc;
+}
+
 /* Table */
 .table {
     --bs-table-bg: transparent;

src/Duempelkas.Desktop/wwwroot/index.html

@@ -1,9 +1,113 @@
 <!DOCTYPE html>
-<html lang="de" data-bs-theme="dark">
+<html lang="de">
 <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <base href="/" />
+    <script>
+        (function () {
+            function getCookie(name) {
+                var parts = document.cookie ? document.cookie.split(';') : [];
+                for (var i = 0; i < parts.length; i++) {
+                    var part = parts[i].trim();
+                    if (part.indexOf(name + '=') === 0) {
+                        return decodeURIComponent(part.substring(name.length + 1));
+                    }
+                }
+
+                return null;
+            }
+
+            function setCookie(name, value) {
+                document.cookie = name + '=' + encodeURIComponent(value) + '; path=/; max-age=31536000; samesite=lax';
+            }
+
+            function getStoredTheme() {
+                try {
+                    var fromStorage = localStorage.getItem('duempelkas-theme');
+                    if (fromStorage === 'light' || fromStorage === 'dark') {
+                        return fromStorage;
+                    }
+                } catch (_) {
+                    // Ignore storage access issues and fall back to cookies/system.
+                }
+
+                var fromCookie = getCookie('duempelkas-theme');
+                if (fromCookie === 'light' || fromCookie === 'dark') {
+                    return fromCookie;
+                }
+
+                return null;
+            }
+
+            function detectSystemTheme() {
+                if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
+                    return 'dark';
+                }
+
+                return 'light';
+            }
+
+            function normalizeTheme(value) {
+                return value === 'dark' ? 'dark' : 'light';
+            }
+
+            function applyTheme(theme, persist) {
+                var resolved = normalizeTheme(theme);
+                document.documentElement.setAttribute('data-ui-theme', resolved);
+                document.documentElement.setAttribute('data-bs-theme', resolved);
+                if (document.body) {
+                    document.body.setAttribute('data-ui-theme', resolved);
+                    document.body.setAttribute('data-bs-theme', resolved);
+                }
+
+                if (persist) {
+                    try {
+                        localStorage.setItem('duempelkas-theme', resolved);
+                    } catch (_) {
+                        // Ignore storage access issues and keep cookie as fallback.
+                    }
+
+                    setCookie('duempelkas-theme', resolved);
+                }
+
+                return resolved;
+            }
+
+            var initialTheme = getStoredTheme() || detectSystemTheme() || 'light';
+            applyTheme(initialTheme, false);
+
+            var duempelkasThemeGetCurrentTheme = function () {
+                var current = document.documentElement.getAttribute('data-ui-theme');
+                return normalizeTheme(current);
+            };
+
+            var duempelkasThemeSetTheme = function (theme) {
+                return applyTheme(theme, true);
+            };
+
+            var duempelkasThemeToggleTheme = function () {
+                var current = document.documentElement.getAttribute('data-ui-theme');
+                var next = current === 'dark' ? 'light' : 'dark';
+                return applyTheme(next, true);
+            };
+
+            globalThis.duempelkasThemeGetCurrentTheme = duempelkasThemeGetCurrentTheme;
+            globalThis.duempelkasThemeSetTheme = duempelkasThemeSetTheme;
+            globalThis.duempelkasThemeToggleTheme = duempelkasThemeToggleTheme;
+
+            window.duempelkasThemeGetCurrentTheme = duempelkasThemeGetCurrentTheme;
+            window.duempelkasThemeSetTheme = duempelkasThemeSetTheme;
+            window.duempelkasThemeToggleTheme = duempelkasThemeToggleTheme;
+
+            // Keep object-style API for compatibility with older calls.
+            window.duempelkasTheme = {
+                getCurrentTheme: duempelkasThemeGetCurrentTheme,
+                setTheme: duempelkasThemeSetTheme,
+                toggleTheme: duempelkasThemeToggleTheme
+            };
+        })();
+    </script>
     <title>Dümpelkas – Kassenbuch</title>
     <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" 
           rel="stylesheet" 

src/Duempelkas.Infrastructure/Duempelkas.Infrastructure.csproj

@@ -12,6 +12,8 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="QuestPDF" Version="*" />
+    <PackageReference Include="SkiaSharp" Version="2.88.9" />
+    <PackageReference Include="SkiaSharp.HarfBuzz" Version="2.88.9" />
   </ItemGroup>
 
   <ItemGroup>

src/Duempelkas.Infrastructure/Services/AccountService.cs

@@ -13,16 +13,60 @@ public class AccountService : IAccountService
 
     public AccountService(IDbContextFactory<FinanceDbContext> dbFactory) => _dbFactory = dbFactory;
 
-    public async Task<List<AccountSummaryDto>> GetAllAccountsAsync()
+    public Task<List<AccountSummaryDto>> GetAllAccountsAsync()
+    {
+        return GetAllAccountsAsync(null);
+    }
+
+    public async Task<List<AccountSummaryDto>> GetAllAccountsAsync(int? year)
     {
         await using var db = await _dbFactory.CreateDbContextAsync();
 
         var accounts = await db.Accounts
-            .Include(a => a.Entries)
             .OrderBy(a => a.Name)
             .ToListAsync();
 
-        return accounts.Select(MapToSummary).ToList();
+        var entries = db.Entries.Where(e => !e.IsDeleted);
+
+        if (year.HasValue)
+        {
+            var movementBeforeYearByAccountId = await entries
+                .Where(e => e.Date.Year < year.Value)
+                .GroupBy(e => e.AccountId)
+                .ToDictionaryAsync(
+                    g => g.Key,
+                    g => g.Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount));
+
+            var movementInYearByAccountId = await entries
+                .Where(e => e.Date.Year == year.Value)
+                .GroupBy(e => e.AccountId)
+                .ToDictionaryAsync(
+                    g => g.Key,
+                    g => g.Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount));
+
+            return accounts
+                .Select(account =>
+                {
+                    var carryoverForYear = account.CarryoverBalance + movementBeforeYearByAccountId.GetValueOrDefault(account.Id);
+                    var totalBalance = carryoverForYear + movementInYearByAccountId.GetValueOrDefault(account.Id);
+                    return new AccountSummaryDto(account.Id, account.Name, carryoverForYear, totalBalance, account.CreatedUtc);
+                })
+                .ToList();
+        }
+
+        var movementAllByAccountId = await entries
+            .GroupBy(e => e.AccountId)
+            .ToDictionaryAsync(
+                g => g.Key,
+                g => g.Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount));
+
+        return accounts
+            .Select(account =>
+            {
+                var totalBalance = account.CarryoverBalance + movementAllByAccountId.GetValueOrDefault(account.Id);
+                return new AccountSummaryDto(account.Id, account.Name, account.CarryoverBalance, totalBalance, account.CreatedUtc);
+            })
+            .ToList();
     }
 
     public async Task<AccountSummaryDto> GetAccountAsync(int accountId)
@@ -34,7 +78,11 @@ public class AccountService : IAccountService
             .FirstOrDefaultAsync(a => a.Id == accountId)
             ?? throw new InvalidOperationException($"Account {accountId} not found.");
 
-        return MapToSummary(account);
+        var totalIncome = account.Entries.Where(e => !e.IsDeleted && e.Type == EntryType.Income).Sum(e => e.Amount);
+        var totalExpense = account.Entries.Where(e => !e.IsDeleted && e.Type == EntryType.Expense).Sum(e => e.Amount);
+        var totalBalance = account.CarryoverBalance + totalIncome - totalExpense;
+
+        return new AccountSummaryDto(account.Id, account.Name, account.CarryoverBalance, totalBalance, account.CreatedUtc);
     }
 
     public async Task<AccountSummaryDto> CreateAccountAsync(string name)
@@ -67,6 +115,27 @@ public class AccountService : IAccountService
         await db.SaveChangesAsync();
     }
 
+    public async Task UpdateCarryoverAsync(int accountId, decimal carryoverBalance, int? year)
+    {
+        if (!year.HasValue)
+        {
+            await UpdateCarryoverAsync(accountId, carryoverBalance);
+            return;
+        }
+
+        await using var db = await _dbFactory.CreateDbContextAsync();
+
+        var account = await db.Accounts.FindAsync(accountId)
+            ?? throw new InvalidOperationException($"Account {accountId} not found.");
+
+        var movementBeforeYear = await db.Entries
+            .Where(e => e.AccountId == accountId && !e.IsDeleted && e.Date.Year < year.Value)
+            .SumAsync(e => e.Type == EntryType.Income ? e.Amount : -e.Amount);
+
+        account.CarryoverBalance = carryoverBalance - movementBeforeYear;
+        await db.SaveChangesAsync();
+    }
+
     public async Task DeleteAccountAsync(int accountId)
     {
         await using var db = await _dbFactory.CreateDbContextAsync();
@@ -94,12 +163,4 @@ public class AccountService : IAccountService
         await db.SaveChangesAsync();
     }
 
-    private static AccountSummaryDto MapToSummary(Account account)
-    {
-        var totalIncome = account.Entries.Where(e => e.Type == EntryType.Income).Sum(e => e.Amount);
-        var totalExpense = account.Entries.Where(e => e.Type == EntryType.Expense).Sum(e => e.Amount);
-        var totalBalance = account.CarryoverBalance + totalIncome - totalExpense;
-
-        return new AccountSummaryDto(account.Id, account.Name, account.CarryoverBalance, totalBalance, account.CreatedUtc);
-    }
 }

src/Duempelkas.Infrastructure/Services/BalanceQueryService.cs

@@ -12,7 +12,7 @@ public class BalanceQueryService : IBalanceQueryService
 
     public BalanceQueryService(IDbContextFactory<FinanceDbContext> dbFactory) => _dbFactory = dbFactory;
 
-    public async Task<AccountBalanceDto> GetAccountBalanceAsync(int accountId)
+    public async Task<AccountBalanceDto> GetAccountBalanceAsync(int accountId, int? year = null)
     {
         await using var db = await _dbFactory.CreateDbContextAsync();
 
@@ -21,21 +21,33 @@ public class BalanceQueryService : IBalanceQueryService
             .FirstOrDefaultAsync(a => a.Id == accountId)
             ?? throw new InvalidOperationException($"Konto {accountId} nicht gefunden.");
 
-        var currentYear = DateTime.Now.Year;
+        var selectedYear = year ?? DateTime.Now.Year;
 
         var activeEntries = account.Entries.Where(e => !e.IsDeleted).ToList();
         var totalIncome = activeEntries.Where(e => e.Type == EntryType.Income).Sum(e => e.Amount);
         var totalExpense = activeEntries.Where(e => e.Type == EntryType.Expense).Sum(e => e.Amount);
-        var currentYearIncome = activeEntries.Where(e => e.Type == EntryType.Income && e.Date.Year == currentYear).Sum(e => e.Amount);
-        var currentYearExpense = activeEntries.Where(e => e.Type == EntryType.Expense && e.Date.Year == currentYear).Sum(e => e.Amount);
-        var totalBalance = account.CarryoverBalance + totalIncome - totalExpense;
+
+        var selectedYearIncome = activeEntries
+            .Where(e => e.Type == EntryType.Income && e.Date.Year == selectedYear)
+            .Sum(e => e.Amount);
+        var selectedYearExpense = activeEntries
+            .Where(e => e.Type == EntryType.Expense && e.Date.Year == selectedYear)
+            .Sum(e => e.Amount);
+
+        var selectedYearCarryover = account.CarryoverBalance + activeEntries
+            .Where(e => e.Date.Year < selectedYear)
+            .Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount);
+
+        var totalBalance = year.HasValue
+            ? selectedYearCarryover + selectedYearIncome - selectedYearExpense
+            : account.CarryoverBalance + totalIncome - totalExpense;
 
         return new AccountBalanceDto(
-            account.CarryoverBalance,
+            year.HasValue ? selectedYearCarryover : account.CarryoverBalance,
             totalIncome,
             totalExpense,
-            currentYearIncome,
-            currentYearExpense,
+            selectedYearIncome,
+            selectedYearExpense,
             totalBalance);
     }
 }

src/Duempelkas.Infrastructure/Services/EntryService.cs

@@ -13,14 +13,20 @@ public class EntryService : IEntryService
 
     public EntryService(IDbContextFactory<FinanceDbContext> dbFactory) => _dbFactory = dbFactory;
 
-    public async Task<List<EntryDto>> GetEntriesAsync(int accountId, bool currentYearOnly)
+    public Task<List<EntryDto>> GetEntriesAsync(int accountId, bool currentYearOnly)
+    {
+        var year = currentYearOnly ? DateTime.Now.Year : (int?)null;
+        return GetEntriesAsync(accountId, year);
+    }
+
+    public async Task<List<EntryDto>> GetEntriesAsync(int accountId, int? year)
     {
         await using var db = await _dbFactory.CreateDbContextAsync();
 
         var query = db.Entries.Where(e => e.AccountId == accountId);
 
-        if (currentYearOnly)
-            query = query.Where(e => e.Date.Year == DateTime.Now.Year);
+        if (year.HasValue)
+            query = query.Where(e => e.Date.Year == year.Value);
 
         var entries = await query
             .OrderBy(e => e.Date)
@@ -59,6 +65,29 @@ public class EntryService : IEntryService
         }).ToList();
     }
 
+    public async Task<List<int>> GetEntryYearsAsync(int accountId)
+    {
+        await using var db = await _dbFactory.CreateDbContextAsync();
+
+        return await db.Entries
+            .Where(e => e.AccountId == accountId)
+            .Select(e => e.Date.Year)
+            .Distinct()
+            .OrderByDescending(y => y)
+            .ToListAsync();
+    }
+
+    public async Task<List<int>> GetAllEntryYearsAsync()
+    {
+        await using var db = await _dbFactory.CreateDbContextAsync();
+
+        return await db.Entries
+            .Select(e => e.Date.Year)
+            .Distinct()
+            .OrderByDescending(y => y)
+            .ToListAsync();
+    }
+
     public async Task<EntryDto> CreateEntryAsync(int accountId, EntryType type, DateTime date, string title, decimal amount)
     {
         await using var db = await _dbFactory.CreateDbContextAsync();

src/Duempelkas.Infrastructure/Services/PdfStatementService.cs

@@ -27,19 +27,25 @@ public class PdfStatementService : IPdfStatementService
         _settingsService = settingsService;
     }
 
-    public async Task<byte[]> GenerateStatementAsync(int accountId, bool currentYearOnly)
+    public Task<byte[]> GenerateStatementAsync(int accountId, bool currentYearOnly)
+    {
+        var year = currentYearOnly ? DateTime.Now.Year : (int?)null;
+        return GenerateStatementAsync(accountId, year);
+    }
+
+    public async Task<byte[]> GenerateStatementAsync(int accountId, int? year)
     {
         await using var db = await _dbFactory.CreateDbContextAsync();
 
         var account = await db.Accounts.FindAsync(accountId)
             ?? throw new InvalidOperationException($"Konto {accountId} nicht gefunden.");
 
-        var entries = await _entryService.GetEntriesAsync(accountId, currentYearOnly);
-        var balance = await _balanceQueryService.GetAccountBalanceAsync(accountId);
+        var entries = await _entryService.GetEntriesAsync(accountId, year);
+        var balance = await _balanceQueryService.GetAccountBalanceAsync(accountId, year);
         var clubName = await _settingsService.GetClubNameAsync() ?? "Mein Verein";
 
-        var title = currentYearOnly
-            ? $"{account.Name} – Auszug {DateTime.Now.Year}"
+        var title = year.HasValue
+            ? $"{account.Name} – Auszug {year.Value}"
             : $"{account.Name} – Gesamtauszug";
 
         var document = Document.Create(container =>
@@ -61,12 +67,6 @@ public class PdfStatementService : IPdfStatementService
 
                 page.Content().PaddingTop(15).Column(col =>
                 {
-                    col.Item().PaddingBottom(10).Row(row =>
-                    {
-                        row.RelativeItem().Text("Übertrag:").SemiBold();
-                        row.AutoItem().Text(FormatCurrency(balance.CarryoverBalance)).SemiBold();
-                    });
-
                     col.Item().Table(table =>
                     {
                         table.ColumnsDefinition(columns =>
@@ -114,9 +114,16 @@ public class PdfStatementService : IPdfStatementService
                     col.Item().PaddingTop(20).LineHorizontal(1).LineColor(Colors.Grey.Lighten2);
                     col.Item().PaddingTop(10).Column(summaryCol =>
                     {
-                        SummaryRow(summaryCol, "Übertrag:", balance.CarryoverBalance);
-                        SummaryRow(summaryCol, "Einnahmen gesamt:", balance.TotalIncome);
-                    SummaryRow(summaryCol, "Ausgaben gesamt:", -balance.TotalExpense);
+                        var incomeValue = year.HasValue ? balance.CurrentYearIncome : balance.TotalIncome;
+                        var expenseValue = year.HasValue ? balance.CurrentYearExpense : balance.TotalExpense;
+
+                        if (year.HasValue)
+                        {
+                            SummaryRow(summaryCol, $"Übertrag von {year.Value - 1}:", balance.CarryoverBalance);
+                        }
+
+                        SummaryRow(summaryCol, year.HasValue ? "Einnahmen:" : "Einnahmen gesamt:", incomeValue);
+                        SummaryRow(summaryCol, year.HasValue ? "Ausgaben:" : "Ausgaben gesamt:", -expenseValue);
                         summaryCol.Item().PaddingTop(5).Row(row =>
                         {
                             row.RelativeItem().Text("Saldo:").Bold().FontSize(12);
@@ -139,7 +146,12 @@ public class PdfStatementService : IPdfStatementService
         return document.GeneratePdf();
     }
 
-    public async Task<byte[]> GenerateDashboardStatementAsync()
+    public Task<byte[]> GenerateDashboardStatementAsync()
+    {
+        return GenerateDashboardStatementAsync(null);
+    }
+
+    public async Task<byte[]> GenerateDashboardStatementAsync(int? year)
     {
         await using var db = await _dbFactory.CreateDbContextAsync();
 
@@ -162,20 +174,65 @@ public class PdfStatementService : IPdfStatementService
             transferByEntryId[transfer.TargetEntryId] = transfer;
         }
 
-        var entries = await db.Entries
+        var entriesQuery = db.Entries
             .Include(e => e.Account)
-            .Where(e => !e.IsDeleted)
+            .Where(e => !e.IsDeleted);
+
+        if (year.HasValue)
+        {
+            entriesQuery = entriesQuery.Where(e => e.Date.Year == year.Value);
+        }
+
+        var entries = await entriesQuery
             .OrderBy(e => e.Date)
             .ThenBy(e => e.CreatedUtc)
             .ToListAsync();
 
+        Dictionary<int, decimal> balanceByAccountId;
+        Dictionary<int, decimal>? carryoverByAccountId = null;
+
+        if (year.HasValue)
+        {
+            var movementBeforeYearByAccountId = await db.Entries
+                .Where(e => !e.IsDeleted && e.Date.Year < year.Value)
+                .GroupBy(e => e.AccountId)
+                .ToDictionaryAsync(
+                    g => g.Key,
+                    g => g.Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount));
+
+            var movementInYearByAccountId = entries
+                .GroupBy(e => e.AccountId)
+                .ToDictionary(
+                    g => g.Key,
+                    g => g.Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount));
+
+            carryoverByAccountId = accounts
+                .ToDictionary(
+                    a => a.Id,
+                    a => a.CarryoverBalance + movementBeforeYearByAccountId.GetValueOrDefault(a.Id));
+
+            balanceByAccountId = accounts
+                .ToDictionary(
+                    a => a.Id,
+                    a => a.CarryoverBalance
+                        + movementBeforeYearByAccountId.GetValueOrDefault(a.Id)
+                        + movementInYearByAccountId.GetValueOrDefault(a.Id));
+        }
+        else
+        {
             var movementByAccountId = entries
                 .GroupBy(e => e.AccountId)
                 .ToDictionary(
                     g => g.Key,
                     g => g.Sum(e => e.Type == EntryType.Income ? e.Amount : -e.Amount));
 
-        var totalClubBalance = accounts.Sum(a => a.CarryoverBalance + movementByAccountId.GetValueOrDefault(a.Id));
+            balanceByAccountId = accounts
+                .ToDictionary(
+                    a => a.Id,
+                    a => a.CarryoverBalance + movementByAccountId.GetValueOrDefault(a.Id));
+        }
+
+        var totalClubBalance = balanceByAccountId.Values.Sum();
 
         var processedTransferIds = new HashSet<int>();
         var rows = new List<DashboardStatementRow>();
@@ -236,7 +293,10 @@ public class PdfStatementService : IPdfStatementService
                 page.Header().Column(col =>
                 {
                     col.Item().Text(clubName).Bold().FontSize(18);
-                    col.Item().Text("Übersicht aller Konten").FontSize(13).FontColor(Colors.Grey.Darken1);
+                    var headerTitle = year.HasValue
+                        ? $"Übersicht aller Konten ({year.Value})"
+                        : "Übersicht aller Konten";
+                    col.Item().Text(headerTitle).FontSize(13).FontColor(Colors.Grey.Darken1);
                     col.Item().PaddingTop(2).Text($"Gesamtvermögen: {FormatCurrency(totalClubBalance)}")
                         .FontSize(10)
                         .SemiBold()
@@ -273,6 +333,18 @@ public class PdfStatementService : IPdfStatementService
                             }
                         });
 
+                        if (year.HasValue && carryoverByAccountId is not null)
+                        {
+                            BodyCell(table, string.Empty);
+                            BodyCell(table, string.Empty);
+                            BodyCell(table, $"Übertrag von {year.Value - 1}", alignRight: true);
+
+                            foreach (var account in accounts)
+                            {
+                                BodyAmountCell(table, carryoverByAccountId.GetValueOrDefault(account.Id));
+                            }
+                        }
+
                         foreach (var row in rows)
                         {
                             BodyCell(table, row.DisplayId);
@@ -291,6 +363,16 @@ public class PdfStatementService : IPdfStatementService
                                 }
                             }
                         }
+
+                        // Add one summary line with the final balance for each account column.
+                        FooterCell(table, string.Empty);
+                        FooterCell(table, string.Empty);
+                        FooterCell(table, "Kontostand", alignRight: true);
+
+                        foreach (var account in accounts)
+                        {
+                            FooterAmountCell(table, balanceByAccountId.GetValueOrDefault(account.Id));
+                        }
                     });
 
                     content.Item().PaddingTop(8).AlignRight().Text(text =>
@@ -352,6 +434,31 @@ public class PdfStatementService : IPdfStatementService
             .FontColor(amount >= 0 ? Colors.Green.Darken1 : Colors.Red.Darken1);
     }
 
+    private static void FooterCell(TableDescriptor table, string text, bool alignRight = false)
+    {
+        var cell = table.Cell()
+            .BorderTop(1)
+            .BorderColor(Colors.Grey.Darken1)
+            .PaddingTop(5)
+            .PaddingBottom(2);
+
+        var content = alignRight ? cell.AlignRight() : cell;
+        content.Text(text).SemiBold();
+    }
+
+    private static void FooterAmountCell(TableDescriptor table, decimal amount)
+    {
+        table.Cell()
+            .BorderTop(1)
+            .BorderColor(Colors.Grey.Darken1)
+            .PaddingTop(5)
+            .PaddingBottom(2)
+            .AlignRight()
+            .Text(FormatCurrency(amount))
+            .SemiBold()
+            .FontColor(amount >= 0 ? Colors.Green.Darken1 : Colors.Red.Darken1);
+    }
+
     private static int ParseDisplayIdYear(string displayId)
     {
         var parts = displayId.Split('-');