diff --git a/dev/Generated/TabViewItemTemplateSettings.properties.cpp b/dev/Generated/TabViewItemTemplateSettings.properties.cpp
index 279d54eec0..140e40d96a 100644
--- a/dev/Generated/TabViewItemTemplateSettings.properties.cpp
+++ b/dev/Generated/TabViewItemTemplateSettings.properties.cpp
@@ -14,6 +14,7 @@ namespace winrt::Microsoft::UI::Xaml::Controls
 #include "TabViewItemTemplateSettings.g.cpp"
 
 GlobalDependencyProperty TabViewItemTemplateSettingsProperties::s_IconElementProperty{ nullptr };
+GlobalDependencyProperty TabViewItemTemplateSettingsProperties::s_TabGeometryProperty{ nullptr };
 
 TabViewItemTemplateSettingsProperties::TabViewItemTemplateSettingsProperties()
 {
@@ -33,11 +34,23 @@ void TabViewItemTemplateSettingsProperties::EnsureProperties()
                 ValueHelper<winrt::IconElement>::BoxedDefaultValue(),
                 nullptr);
     }
+    if (!s_TabGeometryProperty)
+    {
+        s_TabGeometryProperty =
+            InitializeDependencyProperty(
+                L"TabGeometry",
+                winrt::name_of<winrt::Geometry>(),
+                winrt::name_of<winrt::TabViewItemTemplateSettings>(),
+                false /* isAttached */,
+                ValueHelper<winrt::Geometry>::BoxedDefaultValue(),
+                nullptr);
+    }
 }
 
 void TabViewItemTemplateSettingsProperties::ClearProperties()
 {
     s_IconElementProperty = nullptr;
+    s_TabGeometryProperty = nullptr;
 }
 
 void TabViewItemTemplateSettingsProperties::IconElement(winrt::IconElement const& value)
@@ -52,3 +65,16 @@ winrt::IconElement TabViewItemTemplateSettingsProperties::IconElement()
 {
     return ValueHelper<winrt::IconElement>::CastOrUnbox(static_cast<TabViewItemTemplateSettings*>(this)->GetValue(s_IconElementProperty));
 }
+
+void TabViewItemTemplateSettingsProperties::TabGeometry(winrt::Geometry const& value)
+{
+    [[gsl::suppress(con)]]
+    {
+    static_cast<TabViewItemTemplateSettings*>(this)->SetValue(s_TabGeometryProperty, ValueHelper<winrt::Geometry>::BoxValueIfNecessary(value));
+    }
+}
+
+winrt::Geometry TabViewItemTemplateSettingsProperties::TabGeometry()
+{
+    return ValueHelper<winrt::Geometry>::CastOrUnbox(static_cast<TabViewItemTemplateSettings*>(this)->GetValue(s_TabGeometryProperty));
+}
diff --git a/dev/Generated/TabViewItemTemplateSettings.properties.h b/dev/Generated/TabViewItemTemplateSettings.properties.h
index 2d6cba447b..8ca0b724e7 100644
--- a/dev/Generated/TabViewItemTemplateSettings.properties.h
+++ b/dev/Generated/TabViewItemTemplateSettings.properties.h
@@ -12,9 +12,14 @@ class TabViewItemTemplateSettingsProperties
     void IconElement(winrt::IconElement const& value);
     winrt::IconElement IconElement();
 
+    void TabGeometry(winrt::Geometry const& value);
+    winrt::Geometry TabGeometry();
+
     static winrt::DependencyProperty IconElementProperty() { return s_IconElementProperty; }
+    static winrt::DependencyProperty TabGeometryProperty() { return s_TabGeometryProperty; }
 
     static GlobalDependencyProperty s_IconElementProperty;
+    static GlobalDependencyProperty s_TabGeometryProperty;
 
     static void EnsureProperties();
     static void ClearProperties();
diff --git a/dev/TabView/TabView.idl b/dev/TabView/TabView.idl
index d7bf908568..c13800b299 100644
--- a/dev/TabView/TabView.idl
+++ b/dev/TabView/TabView.idl
@@ -178,7 +178,17 @@ unsealed runtimeclass TabViewItemTemplateSettings : Windows.UI.Xaml.DependencyOb
 
     Windows.UI.Xaml.Controls.IconElement IconElement;
 
+    [MUX_PUBLIC_V2]
+    {
+        Windows.UI.Xaml.Media.Geometry TabGeometry;
+    }
+
     static Windows.UI.Xaml.DependencyProperty IconElementProperty{ get; };
+
+    [MUX_PUBLIC_V2]
+    {
+        static Windows.UI.Xaml.DependencyProperty TabGeometryProperty{ get; };
+    }
 }
 
 }
diff --git a/dev/TabView/TabView.xaml b/dev/TabView/TabView.xaml
index 205d8b398b..20e4638f9f 100755
--- a/dev/TabView/TabView.xaml
+++ b/dev/TabView/TabView.xaml
@@ -391,15 +391,12 @@
                                 <VisualState x:Name="Selected">
                                     <VisualState.Setters>
                                         <Setter Target="RightRadiusRenderArc.Visibility" Value="Visible"/>
-                                        <Setter Target="RightRadiusRenderTriangle.Visibility" Value="Visible"/>
-                                        <Setter Target="RightRadiusRenderTriangle.Fill" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}"/>
                                         <Setter Target="LeftRadiusRenderArc.Visibility" Value="Visible"/>
-                                        <Setter Target="LeftRadiusRenderTriangle.Visibility" Value="Visible"/>
-                                        <Setter Target="LeftRadiusRenderTriangle.Fill" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}"/>
+                                        <Setter Target="SelectedBackgroundPath.Visibility" Value="Visible"/>
+                                        <Setter Target="SelectedBackgroundPath.Fill" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}"/>
                                         <Setter Target="TabContainer.Margin" Value="{ThemeResource TabViewSelectedItemHeaderMargin}"/>
                                         <Setter Target="TabContainer.BorderBrush" Value="{ThemeResource TabViewSelectedItemBorderBrush}"/>
                                         <Setter Target="TabContainer.BorderThickness" Value="{ThemeResource TabViewSelectedItemBorderThickness}"/>
-                                        <Setter Target="TabContainer.Background" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}" />
                                         <Setter Target="TabContainer.Padding" Value="{ThemeResource TabViewSelectedItemHeaderPadding}"/>
                                         <Setter Target="ContentPresenter.Foreground" Value="{ThemeResource TabViewItemHeaderForegroundSelected}" />
                                         <Setter Target="IconControl.Foreground" Value="{ThemeResource TabViewItemIconForegroundSelected}" />
@@ -413,15 +410,12 @@
                                 <VisualState x:Name="PointerOverSelected">
                                     <VisualState.Setters>
                                         <Setter Target="RightRadiusRenderArc.Visibility" Value="Visible"/>
-                                        <Setter Target="RightRadiusRenderTriangle.Visibility" Value="Visible"/>
-                                        <Setter Target="RightRadiusRenderTriangle.Fill" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}"/>
                                         <Setter Target="LeftRadiusRenderArc.Visibility" Value="Visible"/>
-                                        <Setter Target="LeftRadiusRenderTriangle.Visibility" Value="Visible"/>
-                                        <Setter Target="LeftRadiusRenderTriangle.Fill" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}"/>
+                                        <Setter Target="SelectedBackgroundPath.Visibility" Value="Visible"/>
+                                        <Setter Target="SelectedBackgroundPath.Fill" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}"/>
                                         <Setter Target="TabContainer.Margin" Value="{ThemeResource TabViewSelectedItemHeaderMargin}"/>
                                         <Setter Target="TabContainer.BorderBrush" Value="{ThemeResource TabViewSelectedItemBorderBrush}"/>
                                         <Setter Target="TabContainer.BorderThickness" Value="{ThemeResource TabViewSelectedItemBorderThickness}"/>
-                                        <Setter Target="TabContainer.Background" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}" />
                                         <Setter Target="TabContainer.Padding" Value="{ThemeResource TabViewSelectedItemHeaderPadding}"/>
                                         <Setter Target="ContentPresenter.Foreground" Value="{ThemeResource TabViewItemHeaderForegroundSelected}" />
                                         <Setter Target="IconControl.Foreground" Value="{ThemeResource TabViewItemIconForegroundSelected}" />
@@ -435,15 +429,12 @@
                                 <VisualState x:Name="PressedSelected">
                                     <VisualState.Setters>
                                         <Setter Target="RightRadiusRenderArc.Visibility" Value="Visible"/>
-                                        <Setter Target="RightRadiusRenderTriangle.Visibility" Value="Visible"/>
-                                        <Setter Target="RightRadiusRenderTriangle.Fill" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}"/>
                                         <Setter Target="LeftRadiusRenderArc.Visibility" Value="Visible"/>
-                                        <Setter Target="LeftRadiusRenderTriangle.Visibility" Value="Visible"/>
-                                        <Setter Target="LeftRadiusRenderTriangle.Fill" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}"/>
+                                        <Setter Target="SelectedBackgroundPath.Visibility" Value="Visible"/>
+                                        <Setter Target="SelectedBackgroundPath.Fill" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}"/>
                                         <Setter Target="TabContainer.Margin" Value="{ThemeResource TabViewSelectedItemHeaderMargin}"/>
                                         <Setter Target="TabContainer.BorderBrush" Value="{ThemeResource TabViewSelectedItemBorderBrush}"/>
                                         <Setter Target="TabContainer.BorderThickness" Value="{ThemeResource TabViewSelectedItemBorderThickness}"/>
-                                        <Setter Target="TabContainer.Background" Value="{ThemeResource TabViewItemHeaderBackgroundSelected}" />
                                         <Setter Target="TabContainer.Padding" Value="{ThemeResource TabViewSelectedItemHeaderPadding}"/>
                                         <Setter Target="ContentPresenter.Foreground" Value="{ThemeResource TabViewItemHeaderForegroundSelected}" />
                                         <Setter Target="IconControl.Foreground" Value="{ThemeResource TabViewItemIconForegroundSelected}" />
@@ -635,14 +626,6 @@
                             Width="4"
                             Data="M4 0C4 1.19469 3.47624 2.26706 2.64582 3H0C1.65685 3 3 1.65685 3 0H4Z" />
 
-                        <Path  x:Name="LeftRadiusRenderTriangle"
-                            x:Load="False"
-                            Fill="{ThemeResource TabViewItemHeaderBackgroundSelected}"
-                            VerticalAlignment="Bottom"
-                            Margin="-4,0,0,0"
-                            Visibility="Collapsed"
-                            Data="M0 4H4V0C4 2.20914 2.20914 4 0 4Z" />
-
                         <Path x:Name="RightRadiusRenderArc"
                             x:Load="False"
                             Grid.Column="2"
@@ -654,14 +637,14 @@
                             Width="4"
                             Data="M0 0C0 1.19469 0.523755 2.26706 1.35418 3H4C2.34315 3 1 1.65685 1 0H0Z"/>
 
-                        <Path x:Name="RightRadiusRenderTriangle"
+                        <Path x:Name="SelectedBackgroundPath"
                             x:Load="False"
-                            Grid.Column="2"
-                            Visibility="Collapsed"
+                            Grid.ColumnSpan="3"
                             Fill="{ThemeResource TabViewItemHeaderBackgroundSelected}"
                             VerticalAlignment="Bottom"
-                            Margin="0,0,-4,0"
-                            Data="M4 4H0V0C0 2.20914 1.79086 4 4 4Z"/>
+                            Margin="-4,0,-4,0"
+                            Visibility="Collapsed"
+                            Data="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TabViewTemplateSettings.TabGeometry}" />
 
                         <Border x:Name="TabSeparator"
                             HorizontalAlignment="Right"
diff --git a/dev/TabView/TabViewItem.cpp b/dev/TabView/TabViewItem.cpp
index 0d826d80a2..b8685e8d2a 100644
--- a/dev/TabView/TabViewItem.cpp
+++ b/dev/TabView/TabViewItem.cpp
@@ -21,6 +21,7 @@ TabViewItem::TabViewItem()
     SetValue(s_TabViewTemplateSettingsProperty, winrt::make<TabViewItemTemplateSettings>());
 
     Loaded({ this, &TabViewItem::OnLoaded });
+    SizeChanged({ this, &TabViewItem::OnSizeChanged });
 
     RegisterPropertyChangedCallback(winrt::SelectorItem::IsSelectedProperty(), { this, &TabViewItem::OnIsSelectedPropertyChanged });
     RegisterPropertyChangedCallback(winrt::Control::ForegroundProperty(), { this, &TabViewItem::OnForegroundPropertyChanged });
@@ -28,8 +29,6 @@ TabViewItem::TabViewItem()
 
 void TabViewItem::OnApplyTemplate()
 {
-    auto popupRadius = unbox_value<winrt::CornerRadius>(ResourceAccessor::ResourceLookup(*this, box_value(c_overlayCornerRadiusKey)));
-
     winrt::IControlProtected controlProtected{ *this };
 
     m_headerContentPresenter.set(GetTemplateChildT<winrt::ContentPresenter>(L"ContentPresenter", controlProtected));
@@ -97,7 +96,33 @@ void TabViewItem::OnApplyTemplate()
 
     UpdateCloseButton();
     UpdateForeground();
-    UpdateWidthModeVisualState();    
+    UpdateWidthModeVisualState();
+    UpdateTabGeometry();
+}
+
+void TabViewItem::UpdateTabGeometry()
+{
+    auto const templateSettings = winrt::get_self<TabViewItemTemplateSettings>(TabViewTemplateSettings());
+
+    auto const height = ActualHeight();
+    auto const popupRadius = unbox_value<winrt::CornerRadius>(ResourceAccessor::ResourceLookup(*this, box_value(c_overlayCornerRadiusKey)));
+    auto const leftCorner = popupRadius.TopLeft;
+    auto const rightCorner = popupRadius.TopRight;
+
+    // Assumes 4px curving-out corners, which are hardcoded in the markup
+    auto data = L"<Geometry xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>F1 M0,%f  a 4,4 0 0 0 4,-4  L 4,%f  a %f,%f 0 0 1 %f,-%f  l %f,0  a %f,%f 0 0 1 %f,%f  l 0,%f  a 4,4 0 0 0 4,4 Z</Geometry>";
+    
+    WCHAR strOut[1024];
+    StringCchPrintf(strOut, ARRAYSIZE(strOut), data,
+        height - 1,
+        leftCorner, leftCorner, leftCorner, leftCorner, leftCorner,
+        ActualWidth() - (leftCorner + rightCorner),
+        rightCorner, rightCorner, rightCorner, rightCorner,
+        height - (4 + rightCorner + 1));
+
+    const auto geometry = winrt::XamlReader::Load(strOut).try_as<winrt::Geometry>();
+
+    templateSettings->TabGeometry(geometry);
 }
 
 void TabViewItem::OnLoaded(const winrt::IInspectable& sender, const winrt::RoutedEventArgs& args)
@@ -110,6 +135,11 @@ void TabViewItem::OnLoaded(const winrt::IInspectable& sender, const winrt::Route
     }
 }
 
+void TabViewItem::OnSizeChanged(const winrt::IInspectable&, const winrt::SizeChangedEventArgs& args)
+{
+    UpdateTabGeometry();
+}
+
 void TabViewItem::OnIsSelectedPropertyChanged(const winrt::DependencyObject& sender, const winrt::DependencyProperty& args)
 {
     
diff --git a/dev/TabView/TabViewItem.h b/dev/TabView/TabViewItem.h
index f348339525..cb21e9d942 100755
--- a/dev/TabView/TabViewItem.h
+++ b/dev/TabView/TabViewItem.h
@@ -58,6 +58,9 @@ class TabViewItem :
     void OnIconSourceChanged();
     void UpdateWidthModeVisualState();
 
+    void OnSizeChanged(const winrt::IInspectable&, const winrt::SizeChangedEventArgs& args);
+    void UpdateTabGeometry();
+
     bool m_firstTimeSettingToolTip{ true };
 
     winrt::ButtonBase::Click_revoker m_closeButtonClickRevoker{};