diff --git a/lib/mv_web/live/member_field_live/form_component.ex b/lib/mv_web/live/member_field_live/form_component.ex
index 1bba048..eba86d1 100644
--- a/lib/mv_web/live/member_field_live/form_component.ex
+++ b/lib/mv_web/live/member_field_live/form_component.ex
@@ -16,8 +16,8 @@ defmodule MvWeb.MemberFieldLive.FormComponent do
   - `on_cancel` - Callback function to call when form is cancelled
 
   ## Note
-  Member fields are technical fields that cannot be changed (name, value_type, description, required).
-  Only the visibility (show_in_overview) can be modified.
+  Member fields are technical fields that cannot be changed (name, value_type).
+  Visibility (show_in_overview) and required flag are stored in Settings and can be modified.
   """
   use MvWeb, :live_component
 
@@ -27,14 +27,13 @@ defmodule MvWeb.MemberFieldLive.FormComponent do
   alias MvWeb.Helpers.FieldTypeFormatter
   alias MvWeb.Translations.MemberFields
 
-  @required_fields [:first_name, :last_name, :email]
-
   @impl true
   def render(assigns) do
     assigns =
       assigns
       |> assign(:field_attributes, get_field_attributes(assigns.member_field))
       |> assign(:is_email_field?, assigns.member_field == :email)
+      |> assign(:vereinfacht_required_field?, vereinfacht_required_field?(assigns))
       |> assign(:field_label, MemberFields.label(assigns.member_field))
 
     ~H"""
@@ -117,89 +116,64 @@ defmodule MvWeb.MemberFieldLive.FormComponent do
             </fieldset>
           </div>
 
-          <div
-            :if={@is_email_field?}
-            class="tooltip tooltip-right"
-            data-tip={gettext("This is a technical field and cannot be changed")}
-            aria-label={gettext("This is a technical field and cannot be changed")}
-          >
-            <fieldset class="mb-2 fieldset">
-              <label>
-                <span class="mb-1 label flex items-center gap-2">
-                  {gettext("Description")}
-                  <.icon
-                    name="hero-information-circle"
-                    class="w-4 h-4 text-base-content/60 cursor-help"
-                    aria-hidden="true"
-                  />
-                </span>
-                <input
-                  type="text"
-                  name={@form[:description].name}
-                  id={@form[:description].id}
-                  value={@form[:description].value}
-                  disabled
-                  readonly
-                  class="w-full input"
-                />
-              </label>
-            </fieldset>
-          </div>
-          <.input
-            :if={not @is_email_field?}
-            field={@form[:description]}
-            type="text"
-            label={gettext("Description")}
-            disabled={@is_email_field?}
-            readonly={@is_email_field?}
-          />
-
-          <div
-            :if={@is_email_field?}
-            class="tooltip tooltip-right"
-            data-tip={gettext("This is a technical field and cannot be changed")}
-            aria-label={gettext("This is a technical field and cannot be changed")}
-          >
-            <fieldset class="mb-2 fieldset">
-              <label>
-                <input type="hidden" name={@form[:required].name} value="false" disabled />
-                <span class="label flex items-center gap-2">
-                  <input
-                    type="checkbox"
-                    name={@form[:required].name}
-                    id={@form[:required].id}
-                    value="true"
-                    checked={@form[:required].value}
-                    disabled
-                    readonly
-                    class="checkbox checkbox-sm"
-                  />
-                  <span class="flex items-center gap-2">
-                    {gettext("Required")}
-                    <.icon
-                      name="hero-information-circle"
-                      class="w-4 h-4 text-base-content/60 cursor-help"
-                      aria-hidden="true"
+          <%!-- Line break before Required / Show in overview block --%>
+          <div class="mt-4">
+            <%!-- Required: disabled for email (always required) or Vereinfacht-required fields when integration is active --%>
+            <div
+              :if={@is_email_field? or @vereinfacht_required_field?}
+              class="tooltip tooltip-right"
+              data-tip={
+                if(@is_email_field?,
+                  do: gettext("This is a technical field and cannot be changed"),
+                  else: gettext("Required for Vereinfacht integration and cannot be disabled.")
+                )
+              }
+              aria-label={
+                if(@is_email_field?,
+                  do: gettext("This is a technical field and cannot be changed"),
+                  else: gettext("Required for Vereinfacht integration and cannot be disabled.")
+                )
+              }
+            >
+              <fieldset class="mb-2 fieldset">
+                <label>
+                  <input type="hidden" name={@form[:required].name} value="true" />
+                  <span class="label flex items-center gap-2">
+                    <input
+                      type="checkbox"
+                      name={@form[:required].name}
+                      id={@form[:required].id}
+                      value="true"
+                      checked={@form[:required].value}
+                      disabled
+                      readonly
+                      class="checkbox checkbox-sm"
                     />
+                    <span class="flex items-center gap-2">
+                      {gettext("Required")}
+                      <.icon
+                        name="hero-information-circle"
+                        class="w-4 h-4 text-base-content/60 cursor-help"
+                        aria-hidden="true"
+                      />
+                    </span>
                   </span>
-                </span>
-              </label>
-            </fieldset>
-          </div>
-          <.input
-            :if={not @is_email_field?}
-            field={@form[:required]}
-            type="checkbox"
-            label={gettext("Required")}
-            disabled={@is_email_field?}
-            readonly={@is_email_field?}
-          />
+                </label>
+              </fieldset>
+            </div>
+            <.input
+              :if={not @is_email_field? and not @vereinfacht_required_field?}
+              field={@form[:required]}
+              type="checkbox"
+              label={gettext("Required")}
+            />
 
-          <.input
-            field={@form[:show_in_overview]}
-            type="checkbox"
-            label={gettext("Show in overview")}
-          />
+            <.input
+              field={@form[:show_in_overview]}
+              type="checkbox"
+              label={gettext("Show in overview")}
+            />
+          </div>
 
           <div class="justify-end mt-4 card-actions">
             <.button type="button" phx-click="cancel" phx-target={@myself}>
@@ -225,24 +199,35 @@ defmodule MvWeb.MemberFieldLive.FormComponent do
 
   @impl true
   def handle_event("validate", %{"member_field" => member_field_params}, socket) do
-    # For member fields, we only validate show_in_overview
-    # Other fields are read-only or derived from the Member Resource
     form = socket.assigns.form
-
-    updated_params =
-      member_field_params
-      |> Map.put(
-        "show_in_overview",
+    # Unchecked checkboxes are not in params; preserve current form value when key is missing
+    show_in_overview =
+      if Map.has_key?(member_field_params, "show_in_overview") do
         TypeParsers.parse_boolean(member_field_params["show_in_overview"])
-      )
-      |> Map.put("name", form.source["name"])
-      |> Map.put("value_type", form.source["value_type"])
-      |> Map.put("description", form.source["description"])
-      |> Map.put("required", form.source["required"])
+      else
+        form.source["show_in_overview"]
+      end
+
+    required =
+      socket.assigns[:vereinfacht_required_field?] ||
+        if Map.has_key?(member_field_params, "required") do
+          TypeParsers.parse_boolean(member_field_params["required"])
+        else
+          form.source["required"]
+        end
+
+    # Merge so we keep name/value_type and have current checkbox state; use as new form source
+    merged_source =
+      form.source
+      |> Map.merge(%{
+        "show_in_overview" => show_in_overview,
+        "required" => required,
+        "name" => form.source["name"],
+        "value_type" => form.source["value_type"]
+      })
 
     updated_form =
-      form
-      |> Map.put(:value, updated_params)
+      to_form(merged_source, as: "member_field")
       |> Map.put(:errors, [])
 
     {:noreply, assign(socket, form: updated_form)}
@@ -250,23 +235,36 @@ defmodule MvWeb.MemberFieldLive.FormComponent do
 
   @impl true
   def handle_event("save", %{"member_field" => member_field_params}, socket) do
-    # Only show_in_overview can be changed for member fields
-    show_in_overview = TypeParsers.parse_boolean(member_field_params["show_in_overview"])
+    form = socket.assigns.form
+    # Unchecked checkboxes are not in submit params; use form source when key missing
+    show_in_overview =
+      if Map.has_key?(member_field_params, "show_in_overview") do
+        TypeParsers.parse_boolean(member_field_params["show_in_overview"])
+      else
+        form.source["show_in_overview"]
+      end
+
+    required =
+      socket.assigns[:vereinfacht_required_field?] ||
+        if Map.has_key?(member_field_params, "required") do
+          TypeParsers.parse_boolean(member_field_params["required"])
+        else
+          form.source["required"]
+        end
+
     field_string = Atom.to_string(socket.assigns.member_field)
 
-    # Use atomic action to update only this single field
-    # This prevents lost updates in concurrent scenarios
-    case Membership.update_single_member_field_visibility(
+    case Membership.update_single_member_field(
            socket.assigns.settings,
            field: field_string,
-           show_in_overview: show_in_overview
+           show_in_overview: show_in_overview,
+           required: required
          ) do
       {:ok, _updated_settings} ->
         socket.assigns.on_save.(socket.assigns.member_field, "update")
         {:noreply, socket}
 
       {:error, error} ->
-        # Add error to form
         form =
           socket.assigns.form
           |> Map.put(:errors, [
@@ -288,16 +286,22 @@ defmodule MvWeb.MemberFieldLive.FormComponent do
   defp assign_form(%{assigns: %{member_field: member_field, settings: settings}} = socket) do
     field_attributes = get_field_attributes(member_field)
     visibility_config = settings.member_field_visibility || %{}
-    normalized_config = VisibilityConfig.normalize(visibility_config)
-    show_in_overview = Map.get(normalized_config, member_field, true)
+    required_config = settings.member_field_required || %{}
+    normalized_visibility = VisibilityConfig.normalize(visibility_config)
+    normalized_required = VisibilityConfig.normalize(required_config)
+    show_in_overview = Map.get(normalized_visibility, member_field, true)
+    vereinfacht_required? = Mv.Config.vereinfacht_configured?()
+
+    # Email always required; Vereinfacht-required fields when integration active; else from settings
+    required =
+      member_field == :email ||
+        (vereinfacht_required? && Mv.Constants.vereinfacht_required_field?(member_field)) ||
+        Map.get(normalized_required, member_field, false)
 
-    # Create a manual form structure with string keys
-    # Note: immutable is not included as it's not editable for member fields
     form_data = %{
       "name" => MemberFields.label(member_field),
       "value_type" => FieldTypeFormatter.format(field_attributes.value_type),
-      "description" => field_attributes.description || "",
-      "required" => field_attributes.required,
+      "required" => required,
       "show_in_overview" => show_in_overview
     }
 
@@ -307,24 +311,14 @@ defmodule MvWeb.MemberFieldLive.FormComponent do
   end
 
   defp get_field_attributes(field) when is_atom(field) do
-    # Get attribute info from Member Resource
     alias Ash.Resource.Info
 
     case Info.attribute(Mv.Membership.Member, field) do
       nil ->
-        # Fallback for fields not in resource (shouldn't happen with Constants)
-        %{
-          value_type: :string,
-          description: nil,
-          required: field in @required_fields
-        }
+        %{value_type: :string}
 
       attribute ->
-        %{
-          value_type: attribute.type,
-          description: nil,
-          required: not attribute.allow_nil?
-        }
+        %{value_type: attribute.type}
     end
   end
 
@@ -335,4 +329,9 @@ defmodule MvWeb.MemberFieldLive.FormComponent do
   defp format_error(error) do
     inspect(error)
   end
+
+  defp vereinfacht_required_field?(assigns) do
+    Mv.Config.vereinfacht_configured?() &&
+      Mv.Constants.vereinfacht_required_field?(assigns.member_field)
+  end
 end
diff --git a/lib/mv_web/live/member_field_live/index_component.ex b/lib/mv_web/live/member_field_live/index_component.ex
index 5204030..db62778 100644
--- a/lib/mv_web/live/member_field_live/index_component.ex
+++ b/lib/mv_web/live/member_field_live/index_component.ex
@@ -22,7 +22,6 @@ defmodule MvWeb.MemberFieldLive.IndexComponent do
     assigns =
       assigns
       |> assign(:member_fields, get_member_fields_with_visibility(assigns.settings))
-      |> assign(:required?, &required?/1)
 
     ~H"""
     <div id={@id}>
@@ -62,22 +61,15 @@ defmodule MvWeb.MemberFieldLive.IndexComponent do
           {format_value_type(field_data.field)}
         </:col>
 
-        <:col :let={{_field_name, field_data}} label={gettext("Description")}>
-          {field_data.description || ""}
-        </:col>
-
         <:col
           :let={{_field_name, field_data}}
           label={gettext("Required")}
           class="max-w-[9.375rem] text-center"
         >
-          <span
-            :if={@required?.(field_data.field)}
-            class="text-base-content font-semibold"
-          >
+          <span :if={field_data.required} class="text-base-content font-semibold">
             {gettext("Required")}
           </span>
-          <span :if={!@required?.(field_data.field)} class="text-base-content/70">
+          <span :if={!field_data.required} class="text-base-content/70">
             {gettext("Optional")}
           </span>
         </:col>
@@ -173,26 +165,35 @@ defmodule MvWeb.MemberFieldLive.IndexComponent do
       {:error, _} ->
         # Return a minimal struct-like map for fallback
         # This is only used for initial rendering, actual settings will be loaded properly
-        %{member_field_visibility: %{}}
+        %{member_field_visibility: %{}, member_field_required: %{}}
     end
   end
 
   defp get_member_fields_with_visibility(settings) do
     member_fields = Mv.Constants.member_fields()
     visibility_config = settings.member_field_visibility || %{}
+    required_config = settings.member_field_required || %{}
+    vereinfacht_required? = Mv.Config.vereinfacht_configured?()
 
-    # Normalize visibility config keys to atoms
-    normalized_config = VisibilityConfig.normalize(visibility_config)
+    normalized_visibility = VisibilityConfig.normalize(visibility_config)
+    normalized_required = VisibilityConfig.normalize(required_config)
 
     Enum.map(member_fields, fn field ->
-      show_in_overview = Map.get(normalized_config, field, true)
+      show_in_overview = Map.get(normalized_visibility, field, true)
+
+      # Email always required; Vereinfacht-required fields when integration active; else from settings
+      required =
+        field == :email ||
+          (vereinfacht_required? && Mv.Constants.vereinfacht_required_field?(field)) ||
+          Map.get(normalized_required, field, false)
+
       attribute = Info.attribute(Mv.Membership.Member, field)
 
       %{
         field: field,
         show_in_overview: show_in_overview,
-        value_type: (attribute && attribute.type) || :string,
-        description: nil
+        required: required,
+        value_type: (attribute && attribute.type) || :string
       }
     end)
     |> Enum.map(fn field_data ->
@@ -206,14 +207,4 @@ defmodule MvWeb.MemberFieldLive.IndexComponent do
       attribute -> FieldTypeFormatter.format(attribute.type)
     end
   end
-
-  # Check if a field is required by checking the actual attribute definition
-  defp required?(field) when is_atom(field) do
-    case Info.attribute(Mv.Membership.Member, field) do
-      nil -> false
-      attribute -> not attribute.allow_nil?
-    end
-  end
-
-  defp required?(_), do: false
 end
diff --git a/priv/gettext/de/LC_MESSAGES/default.po b/priv/gettext/de/LC_MESSAGES/default.po
index d39d86b..c418dca 100644
--- a/priv/gettext/de/LC_MESSAGES/default.po
+++ b/priv/gettext/de/LC_MESSAGES/default.po
@@ -287,8 +287,6 @@ msgstr "Abbrechen"
 #: lib/mv_web/live/group_live/form.ex
 #: lib/mv_web/live/group_live/index.ex
 #: lib/mv_web/live/group_live/show.ex
-#: lib/mv_web/live/member_field_live/form_component.ex
-#: lib/mv_web/live/member_field_live/index_component.ex
 #: lib/mv_web/live/membership_fee_type_live/form.ex
 #: lib/mv_web/live/role_live/form.ex
 #: lib/mv_web/live/role_live/index.html.heex
@@ -2911,3 +2909,8 @@ msgstr "Okt."
 #, elixir-autogen, elixir-format
 msgid "Sep."
 msgstr "Sep."
+
+#: lib/mv_web/live/member_field_live/form_component.ex
+#, elixir-autogen, elixir-format
+msgid "Required for Vereinfacht integration and cannot be disabled."
+msgstr "Für die Vereinfacht-Integration erforderlich und kann nicht deaktiviert werden."
diff --git a/priv/gettext/default.pot b/priv/gettext/default.pot
index ff466ab..2e7e480 100644
--- a/priv/gettext/default.pot
+++ b/priv/gettext/default.pot
@@ -288,8 +288,6 @@ msgstr ""
 #: lib/mv_web/live/group_live/form.ex
 #: lib/mv_web/live/group_live/index.ex
 #: lib/mv_web/live/group_live/show.ex
-#: lib/mv_web/live/member_field_live/form_component.ex
-#: lib/mv_web/live/member_field_live/index_component.ex
 #: lib/mv_web/live/membership_fee_type_live/form.ex
 #: lib/mv_web/live/role_live/form.ex
 #: lib/mv_web/live/role_live/index.html.heex
@@ -2911,3 +2909,8 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sep."
 msgstr ""
+
+#: lib/mv_web/live/member_field_live/form_component.ex
+#, elixir-autogen, elixir-format
+msgid "Required for Vereinfacht integration and cannot be disabled."
+msgstr ""
diff --git a/priv/gettext/en/LC_MESSAGES/default.po b/priv/gettext/en/LC_MESSAGES/default.po
index e5e0181..3c53a7e 100644
--- a/priv/gettext/en/LC_MESSAGES/default.po
+++ b/priv/gettext/en/LC_MESSAGES/default.po
@@ -288,8 +288,6 @@ msgstr ""
 #: lib/mv_web/live/group_live/form.ex
 #: lib/mv_web/live/group_live/index.ex
 #: lib/mv_web/live/group_live/show.ex
-#: lib/mv_web/live/member_field_live/form_component.ex
-#: lib/mv_web/live/member_field_live/index_component.ex
 #: lib/mv_web/live/membership_fee_type_live/form.ex
 #: lib/mv_web/live/role_live/form.ex
 #: lib/mv_web/live/role_live/index.html.heex
@@ -2911,3 +2909,8 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sep."
 msgstr ""
+
+#: lib/mv_web/live/member_field_live/form_component.ex
+#, elixir-autogen, elixir-format
+msgid "Required for Vereinfacht integration and cannot be disabled."
+msgstr "Required for Vereinfacht integration and cannot be disabled."