diff --git a/ucalc/Data/BillingCalculator.cs b/ucalc/Data/BillingCalculator.cs
index 0094ac5..9affbe0 100644
--- a/ucalc/Data/BillingCalculator.cs
+++ b/ucalc/Data/BillingCalculator.cs
@@ -30,13 +30,18 @@ namespace UCalc.Data
     public class CostCalculationResult
     {
         public decimal TotalAmount { get; }
+        public decimal PastAmount { get; }
+        public decimal FutureAmount { get; }
         public string Details { get; }
         public string DetailsForLandlord { get; }
         public bool AffectsTenant { get; }
 
-        public CostCalculationResult(decimal totalAmount, string details, string detailsForLandlord, bool affectsTenant)
+        public CostCalculationResult(decimal totalAmount, decimal pastAmount, decimal futureAmount, string details,
+            string detailsForLandlord, bool affectsTenant)
         {
             TotalAmount = totalAmount;
+            PastAmount = pastAmount;
+            FutureAmount = futureAmount;
             Details = details;
             DetailsForLandlord = detailsForLandlord;
             AffectsTenant = affectsTenant;
@@ -121,7 +126,7 @@ namespace UCalc.Data
             {
                 if (tenant.EntryDate != null && tenant.EntryDate.Value.IsBetween(billing.StartDate, billing.EndDate))
                 {
-                    AddEvent(tenant.EntryDate.Value, tenant, true);
+                    AddEvent(tenant.EntryDate.Value.AddDays(-1), tenant, true);
                 }
 
                 if (tenant.DepartureDate != null &&
@@ -264,7 +269,7 @@ namespace UCalc.Data
             details.Append(costPerDay.CeilAmountToString(Constants.InternalPrecision));
             details.Append(" €\n\n");
 
-            return costPerDay;
+            return costPerDay.Ceil2(Constants.InternalPrecision);
         }
 
         private static IEnumerable<Flat> AffectedFlats(this Cost cost, Billing billing)
@@ -455,7 +460,7 @@ namespace UCalc.Data
             return totalAmount;
         }
 
-        private static void CalculateCostInPast(Billing billing, Tenant tenant, Cost cost, StringBuilder details,
+        private static decimal CalculateCostInPast(Billing billing, Tenant tenant, Cost cost, StringBuilder details,
             IEnumerable<CostEntry> pastCoveringEntries)
         {
             details.Append("In vergangener Abrechnung bereits gezahlt (geschätzt) = ");
@@ -500,9 +505,11 @@ namespace UCalc.Data
 
             details.Append(totalAmount.CeilToString());
             details.Append(" €\n");
+
+            return totalAmount;
         }
 
-        private static void CalculateCostInFuture(Billing billing, Tenant tenant, Cost cost, StringBuilder details,
+        private static decimal CalculateCostInFuture(Billing billing, Tenant tenant, Cost cost, StringBuilder details,
             IEnumerable<CostEntry> futureCoveringEntries)
         {
             details.Append("In nächster Abrechnung erwartet (geschätzt) = ");
@@ -547,13 +554,15 @@ namespace UCalc.Data
 
             details.Append(totalAmount.CeilToString());
             details.Append(" €\n");
+
+            return totalAmount;
         }
 
         private static CostCalculationResult CalculateCost(Billing billing, Tenant tenant, Cost cost)
         {
             if (!AffectsTenant(tenant, cost))
             {
-                return new CostCalculationResult(0, "", "", false);
+                return new CostCalculationResult(0, 0, 0, "", "", false);
             }
 
             var details = new StringBuilder("Kostenpunkt: ");
@@ -579,12 +588,13 @@ namespace UCalc.Data
             details.Append(" €\n");
 
             var detailsLandlord = new StringBuilder(details.ToString());
-            CalculateCostInPast(billing, tenant, cost, detailsLandlord, pastCoveringEntries);
-            CalculateCostInFuture(billing, tenant, cost, detailsLandlord, futureCoveringEntries);
+            var pastAmount = CalculateCostInPast(billing, tenant, cost, detailsLandlord, pastCoveringEntries);
+            var futureAmount = CalculateCostInFuture(billing, tenant, cost, detailsLandlord, futureCoveringEntries);
             details.Append("\n");
             detailsLandlord.Append("\n");
 
-            return new CostCalculationResult(totalAmount, details.ToString(), detailsLandlord.ToString(), true);
+            return new CostCalculationResult(totalAmount, pastAmount, futureAmount, details.ToString(),
+                detailsLandlord.ToString(), true);
         }
 
         public static TenantCalculationResult CalculateForTenant(Billing billing, Tenant tenant)
@@ -630,5 +640,62 @@ namespace UCalc.Data
             return new TenantCalculationResult(tenant, costResults, subTotalAmount, totalAmount, details.ToString(),
                 detailsLandlord.ToString());
         }
+
+        public static string CalculateCostOverview(Billing billing)
+        {
+            var str = new StringBuilder();
+            var tenantResults = billing.Tenants.Select(tenant => CalculateForTenant(billing, tenant)).ToList();
+
+            decimal landlordAmount = 0;
+
+            foreach (var cost in billing.Costs)
+            {
+                str.Append("Kostenpunkt: ");
+                str.Append(cost.Name);
+                str.Append("\n\n");
+
+                var totalAmount = cost.Entries.Aggregate((decimal) 0, (sum, entry) => sum + entry.Amount);
+                str.Append("Insgesamter Betrag: ");
+                str.Append(totalAmount.CeilToString());
+                str.Append(" €\n");
+
+                var (tenantAmount, pastTenantAmount, futureTenantAmount) = tenantResults.Aggregate(
+                    new Tuple<decimal, decimal, decimal>(0, 0, 0),
+                    (sum, tenantResult) =>
+                    {
+                        var costResult = tenantResult.Costs[cost];
+                        return new Tuple<decimal, decimal, decimal>(sum.Item1 + costResult.TotalAmount,
+                            sum.Item2 + costResult.PastAmount, sum.Item3 + costResult.FutureAmount);
+                    });
+
+                str.Append("Auf Mieter umgelegt:\n");
+                str.Append("- Unvermietete Wohnungen werden umgelegt: ");
+                str.Append(cost.ShiftUnrented ? "Ja\n" : "Nein\n");
+                str.Append("- In dieser Abrechnung: ");
+                str.Append(tenantAmount.CeilToString());
+                str.Append(" €\n");
+                str.Append("- In vergangener Abrechnung (geschätzt): ");
+                str.Append(pastTenantAmount.CeilToString());
+                str.Append(" €\n");
+                str.Append("- In zukünftiger Abrechnung (geschätzt): ");
+                str.Append(futureTenantAmount.CeilToString());
+                str.Append(" €\n");
+
+                var t = totalAmount - (tenantAmount + pastTenantAmount + futureTenantAmount);
+                str.Append("Verbleibende Kosten: ");
+                str.Append(t.CeilToString());
+                str.Append(" €\n");
+
+                landlordAmount += t;
+
+                str.Append("\n---\n\n");
+            }
+
+            str.Append("Nicht umgelegte Kosten: ");
+            str.Append(landlordAmount.CeilToString());
+            str.Append(" €");
+
+            return str.ToString();
+        }
     }
 }
\ No newline at end of file
diff --git a/ucalc/Pages/DetailsPage.xaml b/ucalc/Pages/DetailsPage.xaml
index cc58609..e57dce2 100644
--- a/ucalc/Pages/DetailsPage.xaml
+++ b/ucalc/Pages/DetailsPage.xaml
@@ -15,12 +15,12 @@
         <DockPanel Margin="12, 12, 12, 0"
                    DockPanel.Dock="Top">
             <Label DockPanel.Dock="Left"
-                   Content="Mieter:"
+                   Content="Details zu:"
                    Width="180"
                    Foreground="{x:Static local:Constants.SubMainColor}" />
 
             <ComboBox
-                ItemsSource="{Binding Path=Tenants, RelativeSource={RelativeSource AncestorType=pages:DetailsPage}}"
+                ItemsSource="{Binding Path=Items, RelativeSource={RelativeSource AncestorType=pages:DetailsPage}}"
                 SelectionChanged="OnSelectedTenantChanged"
                 x:Name="TenantComboBox">
                 <ComboBox.ItemTemplate>
diff --git a/ucalc/Pages/DetailsPage.xaml.cs b/ucalc/Pages/DetailsPage.xaml.cs
index 346dd79..350eabf 100644
--- a/ucalc/Pages/DetailsPage.xaml.cs
+++ b/ucalc/Pages/DetailsPage.xaml.cs
@@ -5,15 +5,26 @@ using UCalc.Models;
 
 namespace UCalc.Pages
 {
+    public class DetailsItem
+    {
+        public Tenant Tenant { get; }
+        public string Name => Tenant != null ? Tenant.Name : "Kostenübersicht";
+
+        public DetailsItem(Tenant tenant)
+        {
+            Tenant = tenant;
+        }
+    }
+
     public partial class DetailsPage
     {
         public Model Model { get; set; }
         private Billing _billing;
-        public ObservableCollection<Tenant> Tenants { get; }
+        public ObservableCollection<DetailsItem> Items { get; }
 
         public DetailsPage()
         {
-            Tenants = new ObservableCollection<Tenant>();
+            Items = new ObservableCollection<DetailsItem>();
             InitializeComponent();
         }
 
@@ -28,10 +39,11 @@ namespace UCalc.Pages
             }
 
             _billing = Model.Dump();
-            Tenants.Clear();
+            Items.Clear();
+            Items.Add(new DetailsItem(null));
             foreach (var tenant in _billing.Tenants)
             {
-                Tenants.Add(tenant);
+                Items.Add(new DetailsItem(tenant));
             }
 
             TenantComboBox.IsEnabled = true;
@@ -41,15 +53,21 @@ namespace UCalc.Pages
 
         private void OnSelectedTenantChanged(object sender, SelectionChangedEventArgs e)
         {
-            var tenant = (Tenant) ((ComboBox) sender).SelectedItem;
+            var item = (DetailsItem) ((ComboBox) sender).SelectedItem;
 
-            if (tenant == null)
+            if (item == null)
             {
                 CalculationTextBox.Text = "Bitte wählen Sie einen Mieter aus, um die Berechnungen anzuzeigen.";
                 return;
             }
 
-            var result = BillingCalculator.CalculateForTenant(_billing, tenant);
+            if (item.Tenant == null)
+            {
+                CalculationTextBox.Text = BillingCalculator.CalculateCostOverview(_billing);
+                return;
+            }
+
+            var result = BillingCalculator.CalculateForTenant(_billing, item.Tenant);
 
             CalculationTextBox.Text = result.DetailsForLandlord;
         }