diff --git a/Elwig/Windows/PaymentVariantsWindow.xaml.cs b/Elwig/Windows/PaymentVariantsWindow.xaml.cs
index fd083a5..e28a1cd 100644
--- a/Elwig/Windows/PaymentVariantsWindow.xaml.cs
+++ b/Elwig/Windows/PaymentVariantsWindow.xaml.cs
@@ -19,6 +19,7 @@ namespace Elwig.Windows {
     public partial class PaymentVariantsWindow : ContextWindow {
 
         public readonly int Year;
+        public readonly bool SeasonLocked;
         private bool DataValid, DataChanged, NameChanged, CommentChanged, TransferDateValid, TransferDateChanged;
 
         private static readonly JsonSerializerOptions JsonOpt = new() { WriteIndented = true };
@@ -26,6 +27,7 @@ namespace Elwig.Windows {
         public PaymentVariantsWindow(int year) {
             InitializeComponent();
             Year = year;
+            SeasonLocked = Context.Seasons.Find(Year + 1) != null;
             Title = $"Auszahlungsvarianten - Lese {Year} - Elwig";
             if (!App.Config.Debug) {
                 DataInput.Visibility = Visibility.Hidden;
@@ -42,9 +44,9 @@ namespace Elwig.Windows {
                 var locked = !v.TestVariant;
                 DeleteButton.IsEnabled = !locked;
                 CalculateButton.IsEnabled = !locked;
-                CommitButton.IsEnabled = !locked;
+                CommitButton.IsEnabled = !locked && !SeasonLocked;
                 CommitButton.Visibility = !locked ? Visibility.Visible : Visibility.Hidden;
-                RevertButton.IsEnabled = locked;
+                RevertButton.IsEnabled = locked && !SeasonLocked;
                 RevertButton.Visibility = locked ? Visibility.Visible : Visibility.Hidden;
                 Arrow3.Content = locked ? "\xF0B0" : "\xF0AF";
                 CopyButton.IsEnabled = true;