diff --git a/lib/mv/constants.ex b/lib/mv/constants.ex
index 449d1868..f60f77ad 100644
--- a/lib/mv/constants.ex
+++ b/lib/mv/constants.ex
@@ -44,6 +44,14 @@ defmodule Mv.Constants do
 
   @payment_filter_param "pay_filter"
 
+  @payment_count_min_param "pay_min"
+
+  @payment_count_max_param "pay_max"
+
+  @suspended_param "suspended"
+
+  @stichtag_param "stichtag"
+
   @max_boolean_filters 50
 
   @max_mailto_bulk_recipients 50
@@ -200,6 +208,49 @@ defmodule Mv.Constants do
   """
   def payment_filter_param, do: @payment_filter_param
 
+  @doc """
+  Returns the URL parameter name for the payment open-cycle count lower bound
+  (used with `pay_filter=has_unpaid` for the two-sided count range).
+
+  ## Examples
+
+      iex> Mv.Constants.payment_count_min_param()
+      "pay_min"
+  """
+  def payment_count_min_param, do: @payment_count_min_param
+
+  @doc """
+  Returns the URL parameter name for the payment open-cycle count upper bound.
+
+  ## Examples
+
+      iex> Mv.Constants.payment_count_max_param()
+      "pay_max"
+  """
+  def payment_count_max_param, do: @payment_count_max_param
+
+  @doc """
+  Returns the URL parameter name for the suspended-status filter flag.
+
+  ## Examples
+
+      iex> Mv.Constants.suspended_param()
+      "suspended"
+  """
+  def suspended_param, do: @suspended_param
+
+  @doc """
+  Returns the URL parameter name for the point-in-time membership ("Stichtag")
+  filter: keeps members who were active on the given ISO-8601 date X, i.e.
+  `join_date <= X and (exit_date is nil or exit_date > X)`.
+
+  ## Examples
+
+      iex> Mv.Constants.stichtag_param()
+      "stichtag"
+  """
+  def stichtag_param, do: @stichtag_param
+
   @doc """
   Returns the maximum number of boolean custom field filters allowed per request.
 
diff --git a/lib/mv_web/live/components/add_filter_builder_component.ex b/lib/mv_web/live/components/add_filter_builder_component.ex
index f4d2dc15..35fb3dbb 100644
--- a/lib/mv_web/live/components/add_filter_builder_component.ex
+++ b/lib/mv_web/live/components/add_filter_builder_component.ex
@@ -35,6 +35,7 @@ defmodule MvWeb.Components.AddFilterBuilderComponent do
 
   alias Mv.Constants
   alias MvWeb.MemberLive.Index.DateFilter
+  alias MvWeb.MemberLive.Index.DatePresets
   alias MvWeb.MemberLive.Index.FilterDescriptor
   alias MvWeb.MemberLive.Index.FilterParams
   alias MvWeb.MemberLive.Index.PaymentAging
@@ -968,32 +969,30 @@ defmodule MvWeb.Components.AddFilterBuilderComponent do
   # --- date presets ---------------------------------------------------------
 
   defp date_presets do
-    [
-      {"this_year", gettext("This year")},
-      {"last_year", gettext("Last year")},
-      {"this_month", gettext("This month")},
-      {"last_30_days", gettext("Last 30 days")}
-    ]
+    Enum.map(DatePresets.all(), fn preset -> {Atom.to_string(preset), preset_label(preset)} end)
   end
 
-  defp preset_range("this_year") do
-    y = Date.utc_today().year
-    {Date.new!(y, 1, 1), Date.new!(y, 12, 31)}
-  end
+  defp preset_label(:last_7_days), do: gettext("Last 7 days")
+  defp preset_label(:last_30_days), do: gettext("Last 30 days")
+  defp preset_label(:last_3_months), do: gettext("Last 3 months")
+  defp preset_label(:last_12_months), do: gettext("Last 12 months")
+  defp preset_label(:this_month), do: gettext("This month")
+  defp preset_label(:this_quarter), do: gettext("This quarter")
+  defp preset_label(:this_year), do: gettext("This year")
 
-  defp preset_range("last_year") do
-    y = Date.utc_today().year - 1
-    {Date.new!(y, 1, 1), Date.new!(y, 12, 31)}
-  end
+  # Resolves a preset string (from `phx-value-preset`) to a concrete `{from, to}`
+  # tuple via the shared, clock-free `DatePresets` resolver, or nil for an
+  # unknown preset. The resolver defines "this year" as period-to-date
+  # ([Jan 1, today]) per §2.8, superseding the prior full-year range.
+  defp preset_range(preset) when is_binary(preset) do
+    case Enum.find(DatePresets.all(), &(Atom.to_string(&1) == preset)) do
+      nil ->
+        nil
 
-  defp preset_range("this_month") do
-    today = Date.utc_today()
-    {Date.beginning_of_month(today), Date.end_of_month(today)}
-  end
-
-  defp preset_range("last_30_days") do
-    today = Date.utc_today()
-    {Date.add(today, -30), today}
+      key ->
+        %{from: from, to: to} = DatePresets.resolve(key)
+        {from, to}
+    end
   end
 
   defp preset_range(_), do: nil
diff --git a/lib/mv_web/live/member_live/index.ex b/lib/mv_web/live/member_live/index.ex
index b519aa2d..b39ee175 100644
--- a/lib/mv_web/live/member_live/index.ex
+++ b/lib/mv_web/live/member_live/index.ex
@@ -59,6 +59,7 @@ defmodule MvWeb.MemberLive.Index do
   alias MvWeb.MemberLive.Index.MembershipFeeStatus
   alias MvWeb.MemberLive.Index.OverviewQuery
   alias MvWeb.MemberLive.Index.PaymentAging
+  alias MvWeb.MemberLive.Index.Stichtag
   alias MvWeb.MemberLive.Index.ViewSettings
 
   require Ash.Query
@@ -177,6 +178,8 @@ defmodule MvWeb.MemberLive.Index do
       |> assign_new(:sort_order, fn -> :asc end)
       |> assign(:payment_filter, nil)
       |> assign(:payment_period, PaymentAging.default_period())
+      |> assign(:suspended, false)
+      |> assign(:stichtag, nil)
       |> assign(:group_filters, %{})
       |> assign(:groups, groups)
       |> assign(:fee_type_filters, %{})
@@ -679,6 +682,8 @@ defmodule MvWeb.MemberLive.Index do
       |> maybe_update_sort(params)
       |> maybe_update_payment_filter(params)
       |> maybe_update_payment_period(params)
+      |> maybe_update_suspended(params)
+      |> maybe_update_stichtag(params)
       |> maybe_update_group_filters(params)
       |> maybe_update_fee_type_filters(params)
       |> maybe_update_boolean_filters(params)
@@ -728,6 +733,8 @@ defmodule MvWeb.MemberLive.Index do
       socket.assigns.sort_order,
       socket.assigns.payment_filter,
       socket.assigns.payment_period,
+      socket.assigns[:suspended],
+      socket.assigns[:stichtag],
       socket.assigns[:group_filters],
       socket.assigns[:fee_type_filters],
       socket.assigns.boolean_custom_field_filters,
@@ -883,10 +890,19 @@ defmodule MvWeb.MemberLive.Index do
     base_params = add_group_filters(base_params, opts.group_filters || %{})
     base_params = add_fee_type_filters(base_params, opts.fee_type_filters || %{})
     base_params = add_payment_params(base_params, opts.payment_filter, opts.payment_period)
+    base_params = add_status_params(base_params, opts[:suspended], opts[:stichtag])
     base_params = add_boolean_filters(base_params, opts.boolean_filters || %{})
     add_date_filters(base_params, opts.date_filters)
   end
 
+  # Suspended-status flag and Stichtag date serialize additively into the flat
+  # URL contract (suspended=1 / stichtag=<iso>), omitted when inactive (§2.1).
+  defp add_status_params(params, suspended, stichtag) do
+    params
+    |> Map.merge(PaymentAging.suspended_to_params(suspended))
+    |> Map.merge(Stichtag.to_params(stichtag))
+  end
+
   # Period-scoped payment model (§3.3): the payment-count filter and the active
   # period both serialize into the flat URL contract (pay_filter/pay_from/pay_to).
   defp add_payment_params(params, payment_filter, payment_period) do
@@ -906,6 +922,8 @@ defmodule MvWeb.MemberLive.Index do
       sort_order: socket.assigns.sort_order,
       payment_filter: socket.assigns.payment_filter,
       payment_period: socket.assigns.payment_period,
+      suspended: socket.assigns[:suspended] || false,
+      stichtag: socket.assigns[:stichtag],
       group_filters: socket.assigns[:group_filters] || %{},
       boolean_filters: socket.assigns.boolean_custom_field_filters || %{},
       fee_type_filters: socket.assigns[:fee_type_filters] || %{},
@@ -1366,6 +1384,8 @@ defmodule MvWeb.MemberLive.Index do
       date_custom_fields: socket.assigns[:date_custom_fields],
       payment_filter: socket.assigns.payment_filter,
       payment_period: socket.assigns.payment_period,
+      suspended: socket.assigns[:suspended] || false,
+      stichtag: socket.assigns[:stichtag],
       sort_field: socket.assigns.sort_field,
       sort_order: socket.assigns.sort_order,
       custom_fields: socket.assigns.all_custom_fields
@@ -1448,7 +1468,7 @@ defmodule MvWeb.MemberLive.Index do
     valid_fields = Mv.Constants.member_fields() -- non_sortable_fields
 
     field in valid_fields or custom_field_sort?(field) or
-      field in [:groups, :membership_fee_type, :name, :address]
+      field in [:groups, :membership_fee_type, :name, :address, :payment]
   end
 
   defp valid_sort_field_db_or_custom?(field) when is_binary(field) do
@@ -1458,6 +1478,7 @@ defmodule MvWeb.MemberLive.Index do
         field == "membership_fee_type" -> :membership_fee_type
         field == "name" -> :name
         field == "address" -> :address
+        field == "payment" -> :payment
         true -> safe_member_field_atom_only(field)
       end
 
@@ -1507,9 +1528,10 @@ defmodule MvWeb.MemberLive.Index do
   defp determine_field(default, nil), do: default
 
   # Computed/pseudo fields that are nonetheless sortable (they resolve to DB
-  # sort keys in OverviewQuery): groups aggregate and the composite Name/Address
-  # columns. Other computed fields (e.g. membership_fee_status) are not sortable.
-  @sortable_computed_fields [:groups, :name, :address]
+  # sort keys in OverviewQuery): groups aggregate, the composite Name/Address
+  # columns, and the period-scoped payment (unpaid-cycle-count) column. Other
+  # computed fields (e.g. membership_fee_status) are not sortable.
+  @sortable_computed_fields [:groups, :name, :address, :payment]
 
   defp determine_field(default, sf) when is_binary(sf) do
     sortable_strings = Enum.map(@sortable_computed_fields, &Atom.to_string/1)
@@ -1578,6 +1600,15 @@ defmodule MvWeb.MemberLive.Index do
   defp maybe_update_payment_period(socket, params),
     do: assign(socket, :payment_period, PaymentAging.parse_period(params))
 
+  # Suspended-status filter (§1.23) and point-in-time Stichtag (§1.24/§2.6):
+  # both decoded straight from the URL so `handle_params` remains the single
+  # source of truth. Absent params fall back to no filter.
+  defp maybe_update_suspended(socket, params),
+    do: assign(socket, :suspended, PaymentAging.parse_suspended(params))
+
+  defp maybe_update_stichtag(socket, params),
+    do: assign(socket, :stichtag, Stichtag.parse(params))
+
   defp maybe_update_group_filters(socket, params) when is_map(params) do
     prefix = @group_filter_prefix
     prefix_len = String.length(prefix)
@@ -1836,17 +1867,16 @@ defmodule MvWeb.MemberLive.Index do
   all-outstanding default (both bounds nil) reads just "Payment"; a bounded
   period appends the range so the scope is always legible.
   """
-  def payment_column_label(%{from: nil, to: nil}), do: gettext("Fees")
+  def payment_column_label(_period), do: gettext("Fees")
 
-  def payment_column_label(%{from: from, to: to}) do
-    range = "#{payment_bound(from)}–#{payment_bound(to)}"
-    gettext("Fees · %{range}", range: range)
-  end
-
-  def payment_column_label(_), do: gettext("Fees")
-
-  defp payment_bound(%Date{} = d), do: Date.to_iso8601(d)
-  defp payment_bound(_), do: "…"
+  @doc """
+  Whether a payment period is actively scoped (at least one bound set), used to
+  decide whether the compact period indicator badge renders (§1.28). The
+  all-outstanding default (both bounds nil) shows no badge.
+  """
+  def payment_period_active?(%{from: nil, to: nil}), do: false
+  def payment_period_active?(%{from: _, to: _}), do: true
+  def payment_period_active?(_), do: false
 
   defp update_selection_assigns(socket) do
     selected_members = socket.assigns.selected_members
diff --git a/lib/mv_web/live/member_live/index.html.heex b/lib/mv_web/live/member_live/index.html.heex
index 5a56e922..fc4aa559 100644
--- a/lib/mv_web/live/member_live/index.html.heex
+++ b/lib/mv_web/live/member_live/index.html.heex
@@ -456,7 +456,31 @@
       <:col
         :let={member}
         :if={:membership_fee_status in @member_fields_visible}
-        label={MvWeb.MemberLive.Index.payment_column_label(@payment_period)}
+        sort_field={:payment}
+        label={
+          ~H"""
+          <div class="flex items-center gap-1.5">
+            <.live_component
+              module={MvWeb.Components.SortHeaderComponent}
+              id={:sort_payment}
+              field={:payment}
+              label={MvWeb.MemberLive.Index.payment_column_label(@payment_period)}
+              sort_hint={gettext("Click to sort by open payment cycles")}
+              sort_field={@sort_field}
+              sort_order={@sort_order}
+            />
+            <span
+              :if={MvWeb.MemberLive.Index.payment_period_active?(@payment_period)}
+              class="badge badge-soft badge-info badge-sm shrink-0"
+              title={PaymentAging.period_tooltip(@payment_period)}
+              aria-label={PaymentAging.period_tooltip(@payment_period)}
+              data-testid="payment-period-badge"
+            >
+              {PaymentAging.period_short_code(@payment_period) || gettext("filtered")}
+            </span>
+          </div>
+          """
+        }
       >
         <% count = member.unpaid_cycle_count || 0 %>
         <% badge = PaymentAging.badge(count) %>
diff --git a/lib/mv_web/live/member_live/index/date_presets.ex b/lib/mv_web/live/member_live/index/date_presets.ex
new file mode 100644
index 00000000..ca671f73
--- /dev/null
+++ b/lib/mv_web/live/member_live/index/date_presets.ex
@@ -0,0 +1,70 @@
+defmodule MvWeb.MemberLive.Index.DatePresets do
+  @moduledoc """
+  Relative date-range presets for the date value controls (§1.25/§2.8).
+
+  Each preset resolves against a reference date "today" into a concrete
+  `%{from: Date.t(), to: Date.t()}` range. Rolling "last N days/months" presets
+  end on today; the "this month/quarter/year" presets run period-to-date from
+  the respective period start up to today. Resolving is pure and clock-free —
+  the caller passes `today` (defaulting to `Date.utc_today/0`), so the resolved
+  bounds are testable and reproducible.
+
+  The resolved bounds feed the same `jd_*` / `ed_*` / `cdf_*` URL params as an
+  absolute custom range; presets are purely an input convenience and add no new
+  persistence dimension.
+  """
+
+  @type preset ::
+          :last_7_days
+          | :last_30_days
+          | :last_3_months
+          | :last_12_months
+          | :this_month
+          | :this_quarter
+          | :this_year
+
+  @type range :: %{from: Date.t(), to: Date.t()}
+
+  @presets [
+    :last_7_days,
+    :last_30_days,
+    :last_3_months,
+    :last_12_months,
+    :this_month,
+    :this_quarter,
+    :this_year
+  ]
+
+  @doc """
+  Returns every preset key in display order (rolling windows first, then the
+  period-to-date presets), for rendering the preset radio list.
+  """
+  @spec all() :: [preset()]
+  def all, do: @presets
+
+  @doc """
+  Whether `key` names a known preset.
+  """
+  @spec preset?(term()) :: boolean()
+  def preset?(key), do: key in @presets
+
+  @doc """
+  Resolves a preset to a concrete `{from, to}` range relative to `today`
+  (default `Date.utc_today/0`).
+  """
+  @spec resolve(preset(), Date.t()) :: range()
+  def resolve(preset, today \\ Date.utc_today())
+
+  def resolve(:last_7_days, today), do: %{from: Date.add(today, -6), to: today}
+  def resolve(:last_30_days, today), do: %{from: Date.add(today, -29), to: today}
+  def resolve(:last_3_months, today), do: %{from: Date.shift(today, month: -3), to: today}
+  def resolve(:last_12_months, today), do: %{from: Date.shift(today, month: -12), to: today}
+  def resolve(:this_month, today), do: %{from: %{today | day: 1}, to: today}
+
+  def resolve(:this_quarter, today) do
+    first_month = div(today.month - 1, 3) * 3 + 1
+    %{from: Date.new!(today.year, first_month, 1), to: today}
+  end
+
+  def resolve(:this_year, today), do: %{from: Date.new!(today.year, 1, 1), to: today}
+end
diff --git a/lib/mv_web/live/member_live/index/overview_query.ex b/lib/mv_web/live/member_live/index/overview_query.ex
index a45dd077..dc125d65 100644
--- a/lib/mv_web/live/member_live/index/overview_query.ex
+++ b/lib/mv_web/live/member_live/index/overview_query.ex
@@ -46,9 +46,16 @@ defmodule MvWeb.MemberLive.Index.OverviewQuery do
       opts[:boolean_custom_fields]
     )
     |> apply_date_filters(opts[:date_filters])
+    |> apply_stichtag_filter(opts[:stichtag])
     |> apply_custom_date_filters(opts[:date_filters], opts[:date_custom_fields])
     |> apply_payment_filter(opts[:payment_filter], payment_period(opts))
-    |> apply_sort(opts[:sort_field], opts[:sort_order], opts[:custom_fields] || [])
+    |> apply_suspended_filter(opts[:suspended], payment_period(opts))
+    |> apply_sort(
+      opts[:sort_field],
+      opts[:sort_order],
+      opts[:custom_fields] || [],
+      payment_period(opts)
+    )
   end
 
   # ---------------------------------------------------------------------------
@@ -61,7 +68,12 @@ defmodule MvWeb.MemberLive.Index.OverviewQuery do
   defp apply_search(query, _), do: query
 
   # ---------------------------------------------------------------------------
-  # Group filters (AND across selected groups)
+  # Group filters (:in OR across selected groups; :not_in AND-of-not-exists)
+  #
+  # Multiple "is" selections bundle into a single membership `exists` over the
+  # union of group ids, so a member matching *any* selected group is kept (OR,
+  # §1.29/§2.7). Each "is not" selection stays an independent not-exists, so a
+  # member is excluded when it belongs to *any* of them.
   # ---------------------------------------------------------------------------
 
   defp apply_group_filters(query, group_filters, _groups)
@@ -71,31 +83,32 @@ defmodule MvWeb.MemberLive.Index.OverviewQuery do
   defp apply_group_filters(query, group_filters, groups) do
     valid_ids = valid_id_set(groups)
 
-    Enum.reduce(group_filters, query, fn {group_id_str, value}, q ->
-      if MapSet.member?(valid_ids, group_id_str) do
-        apply_one_group_filter(q, group_id_str, value)
-      else
-        q
+    {in_filters, not_in_filters} =
+      group_filters
+      |> Enum.filter(fn {id_str, _} -> MapSet.member?(valid_ids, id_str) end)
+      |> Enum.split_with(fn {_, value} -> value == :in end)
+
+    query
+    |> apply_group_in_filter(Enum.map(in_filters, fn {id_str, _} -> id_str end))
+    |> apply_group_not_in_filters(Enum.map(not_in_filters, fn {id_str, _} -> id_str end))
+  end
+
+  defp apply_group_in_filter(query, id_strs) do
+    case cast_uuids(id_strs) do
+      [] -> query
+      uuids -> Ash.Query.filter(query, expr(exists(member_groups, group_id in ^uuids)))
+    end
+  end
+
+  defp apply_group_not_in_filters(query, id_strs) do
+    Enum.reduce(id_strs, query, fn id_str, q ->
+      case Ecto.UUID.cast(id_str) do
+        {:ok, uuid} -> Ash.Query.filter(q, expr(not exists(member_groups, group_id == ^uuid)))
+        _ -> q
       end
     end)
   end
 
-  defp apply_one_group_filter(query, group_id_str, :in) do
-    case Ecto.UUID.cast(group_id_str) do
-      {:ok, uuid} -> Ash.Query.filter(query, expr(exists(member_groups, group_id == ^uuid)))
-      _ -> query
-    end
-  end
-
-  defp apply_one_group_filter(query, group_id_str, :not_in) do
-    case Ecto.UUID.cast(group_id_str) do
-      {:ok, uuid} -> Ash.Query.filter(query, expr(not exists(member_groups, group_id == ^uuid)))
-      _ -> query
-    end
-  end
-
-  defp apply_one_group_filter(query, _id, _value), do: query
-
   # ---------------------------------------------------------------------------
   # Fee-type filters (:in OR; :not_in AND)
   # ---------------------------------------------------------------------------
@@ -209,8 +222,53 @@ defmodule MvWeb.MemberLive.Index.OverviewQuery do
     )
   end
 
+  # Two-sided open-cycle range (§1.22/§3.14): keeps members whose in-period
+  # unpaid count is within [min, max]. `max` nil means unbounded above, so
+  # `{:unpaid_range, 1, nil}` is the default "has open" (>= 1). Both bounds push
+  # to SQL through the same `unpaid_cycle_count` calculation.
+  defp apply_payment_filter(query, {:unpaid_range, min, max}, %{from: from, to: to})
+       when is_integer(min) and min > 0 do
+    query
+    |> Ash.Query.filter(unpaid_cycle_count(period_from: ^from, period_to: ^to) >= ^min)
+    |> apply_unpaid_upper_bound(max, from, to)
+  end
+
   defp apply_payment_filter(query, _filter, _period), do: query
 
+  defp apply_unpaid_upper_bound(query, max, from, to) when is_integer(max) and max > 0 do
+    Ash.Query.filter(
+      query,
+      expr(unpaid_cycle_count(period_from: ^from, period_to: ^to) <= ^max)
+    )
+  end
+
+  defp apply_unpaid_upper_bound(query, _max, _from, _to), do: query
+
+  # Suspended-status filter (§1.23): keeps members with at least one suspended
+  # cycle whose cycle_end falls in the active period. Independent of the unpaid
+  # count, which excludes suspended (§2.5). A correlated `exists` pushes to SQL;
+  # the period bounds are composed conditionally so an unbounded (nil) side adds
+  # no `cycle_end` comparison rather than comparing against a literal nil.
+  defp apply_suspended_filter(query, true, %{from: from, to: to}) do
+    Ash.Query.filter(
+      query,
+      expr(exists(membership_fee_cycles, ^suspended_period_predicate(from, to)))
+    )
+  end
+
+  defp apply_suspended_filter(query, _suspended, _period), do: query
+
+  defp suspended_period_predicate(nil, nil), do: expr(status == :suspended)
+
+  defp suspended_period_predicate(from, nil),
+    do: expr(status == :suspended and cycle_end >= ^from)
+
+  defp suspended_period_predicate(nil, to),
+    do: expr(status == :suspended and cycle_end <= ^to)
+
+  defp suspended_period_predicate(from, to),
+    do: expr(status == :suspended and cycle_end >= ^from and cycle_end <= ^to)
+
   # ---------------------------------------------------------------------------
   # Built-in date filters (join/exit)
   # ---------------------------------------------------------------------------
@@ -226,21 +284,41 @@ defmodule MvWeb.MemberLive.Index.OverviewQuery do
 
   defp apply_custom_date_filters(query, _filters, _custom_fields), do: query
 
+  # ---------------------------------------------------------------------------
+  # Point-in-time membership ("Stichtag"): a member counts as a member on the
+  # reference date X iff it had joined by X and had not yet left as of X
+  # (§1.24/§2.6). "Left as of X" means a non-nil exit_date at or before X, so an
+  # exit_date strictly after X (or nil) still counts as a member on X.
+  # ---------------------------------------------------------------------------
+
+  defp apply_stichtag_filter(query, %Date{} = x) do
+    Ash.Query.filter(
+      query,
+      expr(join_date <= ^x and (is_nil(exit_date) or exit_date > ^x))
+    )
+  end
+
+  defp apply_stichtag_filter(query, _), do: query
+
   # ---------------------------------------------------------------------------
   # Sort (always append the unique id tie-breaker for keyset stability)
   # ---------------------------------------------------------------------------
 
-  defp apply_sort(query, nil, _order, _custom_fields), do: Ash.Query.sort(query, id: :asc)
-  defp apply_sort(query, _field, nil, _custom_fields), do: Ash.Query.sort(query, id: :asc)
+  defp apply_sort(query, nil, _order, _custom_fields, _period),
+    do: Ash.Query.sort(query, id: :asc)
+
+  defp apply_sort(query, _field, nil, _custom_fields, _period),
+    do: Ash.Query.sort(query, id: :asc)
 
   # Composite "Member" column: sort by last name then first name. The email that
   # shares the cell is display-only and does not affect the sort key (§1.21).
-  defp apply_sort(query, field, order, _custom_fields) when field in [:name, "name"] do
+  defp apply_sort(query, field, order, _custom_fields, _period) when field in [:name, "name"] do
     Ash.Query.sort(query, [{:last_name, order}, {:first_name, order}, {:id, :asc}])
   end
 
   # Composite "Address" column: sort by city, then postal code, then street.
-  defp apply_sort(query, field, order, _custom_fields) when field in [:address, "address"] do
+  defp apply_sort(query, field, order, _custom_fields, _period)
+       when field in [:address, "address"] do
     Ash.Query.sort(query, [
       {:city, order},
       {:postal_code, order},
@@ -249,7 +327,20 @@ defmodule MvWeb.MemberLive.Index.OverviewQuery do
     ])
   end
 
-  defp apply_sort(query, field, order, custom_fields) do
+  # "Beiträge" (payment) column: sort DB-side by the period-scoped unpaid-cycle
+  # count (§1.27). The count calculation takes the active period as arguments so
+  # the sort key matches the displayed value; the id tie-breaker keeps keyset
+  # pages stable across equal counts.
+  defp apply_sort(query, field, order, _custom_fields, %{from: from, to: to})
+       when field in [:payment, "payment"] do
+    Ash.Query.sort(query, [
+      {Ash.Sort.expr_sort(unpaid_cycle_count(period_from: ^from, period_to: ^to), :integer),
+       order},
+      {:id, :asc}
+    ])
+  end
+
+  defp apply_sort(query, field, order, custom_fields, _period) do
     case sort_key(field) do
       nil -> apply_custom_field_sort(query, field, order, custom_fields)
       key -> Ash.Query.sort(query, [{key, order}, {:id, :asc}])
diff --git a/lib/mv_web/live/member_live/index/payment_aging.ex b/lib/mv_web/live/member_live/index/payment_aging.ex
index e6154aa7..9fc4cd65 100644
--- a/lib/mv_web/live/member_live/index/payment_aging.ex
+++ b/lib/mv_web/live/member_live/index/payment_aging.ex
@@ -29,11 +29,18 @@ defmodule MvWeb.MemberLive.Index.PaymentAging do
 
   @type period :: %{from: Date.t() | nil, to: Date.t() | nil}
 
-  @type filter :: nil | :fully_paid | {:has_unpaid, 1..3}
+  @type filter ::
+          nil
+          | :fully_paid
+          | {:has_unpaid, 1..3}
+          | {:unpaid_range, pos_integer(), pos_integer() | nil}
 
   @payment_period_from_param Constants.payment_period_from_param()
   @payment_period_to_param Constants.payment_period_to_param()
   @payment_filter_param Constants.payment_filter_param()
+  @payment_count_min_param Constants.payment_count_min_param()
+  @payment_count_max_param Constants.payment_count_max_param()
+  @suspended_param Constants.suspended_param()
 
   @doc """
   The default period: all outstanding cycles, all time (both bounds nil).
@@ -83,6 +90,10 @@ defmodule MvWeb.MemberLive.Index.PaymentAging do
 
   @doc """
   Encodes a payment-count filter into URL params. `nil` yields the empty map.
+
+  The two-sided `{:unpaid_range, min, max}` form encodes as
+  `pay_filter=has_unpaid` plus `pay_min` (and `pay_max` when bounded above),
+  so a fresh "has open" default (`min=1`, `max=nil`) round-trips canonically.
   """
   @spec filter_to_params(filter()) :: %{optional(String.t()) => String.t()}
   def filter_to_params(:fully_paid), do: %{@payment_filter_param => "fully_paid"}
@@ -90,14 +101,61 @@ defmodule MvWeb.MemberLive.Index.PaymentAging do
   def filter_to_params({:has_unpaid, n}) when n in 1..3,
     do: %{@payment_filter_param => "unpaid_#{n}"}
 
+  def filter_to_params({:unpaid_range, min, max}) when is_integer(min) and min > 0 do
+    %{@payment_filter_param => "has_unpaid", @payment_count_min_param => Integer.to_string(min)}
+    |> maybe_put_max(max)
+  end
+
   def filter_to_params(_), do: %{}
 
+  defp maybe_put_max(params, max) when is_integer(max) and max > 0,
+    do: Map.put(params, @payment_count_max_param, Integer.to_string(max))
+
+  defp maybe_put_max(params, _max), do: params
+
   @doc """
   Decodes the payment-count filter from a full params map.
+
+  A `pay_filter=has_unpaid` value reads the `pay_min`/`pay_max` bounds into a
+  `{:unpaid_range, min, max}`; an absent/invalid `pay_min` defaults to 1 and an
+  absent/invalid `pay_max` to nil (unbounded). Other `pay_filter` values fall
+  back to the single-token decode (`fully_paid` / `unpaid_N`).
   """
   @spec parse_filter_params(map()) :: filter()
-  def parse_filter_params(params) when is_map(params),
-    do: parse_filter(Map.get(params, @payment_filter_param))
+  def parse_filter_params(params) when is_map(params) do
+    case Map.get(params, @payment_filter_param) do
+      "has_unpaid" ->
+        {:unpaid_range, parse_count(Map.get(params, @payment_count_min_param), 1),
+         parse_count(Map.get(params, @payment_count_max_param), nil)}
+
+      other ->
+        parse_filter(other)
+    end
+  end
+
+  defp parse_count(value, default) when is_binary(value) do
+    case Integer.parse(String.trim(value)) do
+      {n, ""} when n > 0 -> n
+      _ -> default
+    end
+  end
+
+  defp parse_count(_value, default), do: default
+
+  @doc """
+  Decodes the suspended-status filter flag (§1.23) from a params map. The flag
+  is present (`suspended=1`) only when active; any other value reads as false.
+  """
+  @spec parse_suspended(map()) :: boolean()
+  def parse_suspended(params) when is_map(params), do: Map.get(params, @suspended_param) == "1"
+
+  @doc """
+  Encodes the suspended-status filter flag into URL params. Only `true` emits a
+  param (`suspended=1`); false/nil yield the empty map so a fresh URL is canonical.
+  """
+  @spec suspended_to_params(boolean() | nil) :: %{optional(String.t()) => String.t()}
+  def suspended_to_params(true), do: %{@suspended_param => "1"}
+  def suspended_to_params(_), do: %{}
 
   @doc """
   Badge descriptor for an unpaid-cycle count. A count of 0 reads "Alle bezahlt"
@@ -132,6 +190,53 @@ defmodule MvWeb.MemberLive.Index.PaymentAging do
     }
   end
 
+  @doc """
+  Compact short code for a payment period (§1.28), or nil when the period is not
+  compactly codeable (the header then falls back to a plain "filtered" badge).
+
+    * `{nil, nil}` (all-outstanding default) → nil (no badge)
+    * a full calendar year (Jan 1 – Dec 31) → `"2026"`
+    * a full calendar quarter → `"Q1 2026"`
+    * anything else (arbitrary or open-ended range) → nil
+  """
+  @spec period_short_code(period()) :: String.t() | nil
+  def period_short_code(%{from: %Date{} = from, to: %Date{} = to}) do
+    cond do
+      full_year?(from, to) -> Integer.to_string(from.year)
+      full_quarter?(from, to) -> "Q#{quarter(from.month)} #{from.year}"
+      true -> nil
+    end
+  end
+
+  def period_short_code(_), do: nil
+
+  @doc """
+  Human-readable tooltip naming the active payment period with locally formatted
+  (`dd.MM.yyyy`) bounds (§1.28). The all-outstanding default names all
+  outstanding cycles; open-ended periods render an open bound as an ellipsis.
+  """
+  @spec period_tooltip(period()) :: String.t()
+  def period_tooltip(%{from: nil, to: nil}), do: gettext("Fees across all outstanding cycles")
+
+  def period_tooltip(%{from: from, to: to}) do
+    gettext("Fees in period %{from}–%{to}", from: period_bound(from), to: period_bound(to))
+  end
+
+  def period_tooltip(_), do: gettext("Fees across all outstanding cycles")
+
+  defp period_bound(%Date{} = d), do: DateFormatter.format_date(d)
+  defp period_bound(_), do: "…"
+
+  defp full_year?(from, to),
+    do:
+      from.month == 1 and from.day == 1 and to.year == from.year and to.month == 12 and
+        to.day == 31
+
+  defp full_quarter?(from, to) do
+    from.day == 1 and from.month in [1, 4, 7, 10] and to.year == from.year and
+      to == Date.end_of_month(Date.new!(from.year, from.month + 2, 1))
+  end
+
   @doc """
   A member's open cycles for the badge tooltip: the unpaid and suspended cycles
   whose `cycle_end` falls inside `period`, merged into a single list sorted
diff --git a/lib/mv_web/live/member_live/index/stichtag.ex b/lib/mv_web/live/member_live/index/stichtag.ex
new file mode 100644
index 00000000..647d609d
--- /dev/null
+++ b/lib/mv_web/live/member_live/index/stichtag.ex
@@ -0,0 +1,36 @@
+defmodule MvWeb.MemberLive.Index.Stichtag do
+  @moduledoc """
+  URL codec for the point-in-time membership ("Stichtag") filter (§1.24/§2.6).
+
+  The Stichtag is a single ISO-8601 date X carried in the flat URL contract
+  under the `stichtag` key. When set, the overview keeps members who were active
+  on X (`join_date <= X and (exit_date is nil or exit_date > X)`); the predicate
+  itself lives in `OverviewQuery`. Absent or malformed values decode to nil (no
+  filter), and nil encodes to the empty map so a fresh URL stays canonical.
+  """
+
+  @stichtag_param Mv.Constants.stichtag_param()
+
+  @doc """
+  Decodes the Stichtag date from a params map. Missing or malformed ISO-8601
+  values yield nil.
+  """
+  @spec parse(map()) :: Date.t() | nil
+  def parse(params) when is_map(params), do: parse_date(Map.get(params, @stichtag_param))
+
+  @doc """
+  Encodes a Stichtag date into URL params. nil yields the empty map.
+  """
+  @spec to_params(Date.t() | nil) :: %{optional(String.t()) => String.t()}
+  def to_params(%Date{} = date), do: %{@stichtag_param => Date.to_iso8601(date)}
+  def to_params(_), do: %{}
+
+  defp parse_date(value) when is_binary(value) do
+    case Date.from_iso8601(String.trim(value)) do
+      {:ok, date} -> date
+      _ -> nil
+    end
+  end
+
+  defp parse_date(_), do: nil
+end
diff --git a/priv/gettext/de/LC_MESSAGES/default.po b/priv/gettext/de/LC_MESSAGES/default.po
index a8243b50..d6f9123f 100644
--- a/priv/gettext/de/LC_MESSAGES/default.po
+++ b/priv/gettext/de/LC_MESSAGES/default.po
@@ -3956,6 +3956,7 @@ msgid "email %{email} has already been taken"
 msgstr "E-Mail %{email} wurde bereits verwendet"
 
 #: lib/mv_web/components/bulk_actions_dropdown.ex
+#: lib/mv_web/live/member_live/index.html.heex
 #, elixir-autogen, elixir-format
 msgid "filtered"
 msgstr "gefiltert"
@@ -4212,11 +4213,6 @@ msgstr "Beigetreten"
 msgid "Last 30 days"
 msgstr "Letzte 30 Tage"
 
-#: lib/mv_web/live/components/add_filter_builder_component.ex
-#, elixir-autogen, elixir-format
-msgid "Last year"
-msgstr "Letztes Jahr"
-
 #: lib/mv_web/live/components/add_filter_builder_component.ex
 #, elixir-autogen, elixir-format
 msgid "Membership"
@@ -4307,11 +4303,6 @@ msgstr "Februar"
 msgid "Fees"
 msgstr "Beiträge"
 
-#: lib/mv_web/live/member_live/index.ex
-#, elixir-autogen, elixir-format
-msgid "Fees · %{range}"
-msgstr "Beiträge · %{range}"
-
 #: lib/mv_web/live/member_live/index/payment_aging.ex
 #, elixir-autogen, elixir-format
 msgid "January"
@@ -4347,27 +4338,37 @@ msgstr "Oktober"
 msgid "September"
 msgstr "September"
 
-#~ #: lib/mv_web/live/member_live/index.html.heex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Click for member details"
-#~ msgstr "Klicke für Mitglieds-Details"
+#: lib/mv_web/live/member_live/index.html.heex
+#, elixir-autogen, elixir-format
+msgid "Click to sort by open payment cycles"
+msgstr "Klicke, um nach offenen Beitragszyklen zu sortieren"
 
-#~ #: lib/mv_web/live/member_live/index.html.heex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "No open cycles for this period"
-#~ msgstr "Keine offenen Zyklen in diesem Zeitraum"
+#: lib/mv_web/live/components/add_filter_builder_component.ex
+#, elixir-autogen, elixir-format
+msgid "Last 12 months"
+msgstr "Letzte 12 Monate"
 
-#~ #: lib/mv_web/live/member_live/index.ex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Payment · %{range}"
-#~ msgstr "Zahlung · %{range}"
+#: lib/mv_web/live/components/add_filter_builder_component.ex
+#, elixir-autogen, elixir-format
+msgid "Last 3 months"
+msgstr "Letzte 3 Monate"
 
-#~ #: lib/mv_web/live/member_live/index.html.heex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Suspended: %{date}"
-#~ msgstr "Ausgesetzt: %{date}"
+#: lib/mv_web/live/components/add_filter_builder_component.ex
+#, elixir-autogen, elixir-format
+msgid "Last 7 days"
+msgstr "Letzte 7 Tage"
 
-#~ #: lib/mv_web/live/member_live/index.html.heex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Unpaid until %{date}"
-#~ msgstr "Offen bis %{date}"
+#: lib/mv_web/live/components/add_filter_builder_component.ex
+#, elixir-autogen, elixir-format
+msgid "This quarter"
+msgstr "Dieses Quartal"
+
+#: lib/mv_web/live/member_live/index/payment_aging.ex
+#, elixir-autogen, elixir-format
+msgid "Fees across all outstanding cycles"
+msgstr "Beiträge über alle offenen Zyklen"
+
+#: lib/mv_web/live/member_live/index/payment_aging.ex
+#, elixir-autogen, elixir-format
+msgid "Fees in period %{from}–%{to}"
+msgstr "Beiträge im Zeitraum %{from}–%{to}"
diff --git a/priv/gettext/default.pot b/priv/gettext/default.pot
index 9de292e9..d0f9425b 100644
--- a/priv/gettext/default.pot
+++ b/priv/gettext/default.pot
@@ -3956,6 +3956,7 @@ msgid "email %{email} has already been taken"
 msgstr ""
 
 #: lib/mv_web/components/bulk_actions_dropdown.ex
+#: lib/mv_web/live/member_live/index.html.heex
 #, elixir-autogen, elixir-format
 msgid "filtered"
 msgstr ""
@@ -4212,11 +4213,6 @@ msgstr ""
 msgid "Last 30 days"
 msgstr ""
 
-#: lib/mv_web/live/components/add_filter_builder_component.ex
-#, elixir-autogen, elixir-format
-msgid "Last year"
-msgstr ""
-
 #: lib/mv_web/live/components/add_filter_builder_component.ex
 #, elixir-autogen, elixir-format
 msgid "Membership"
@@ -4307,11 +4303,6 @@ msgstr ""
 msgid "Fees"
 msgstr ""
 
-#: lib/mv_web/live/member_live/index.ex
-#, elixir-autogen, elixir-format
-msgid "Fees · %{range}"
-msgstr ""
-
 #: lib/mv_web/live/member_live/index/payment_aging.ex
 #, elixir-autogen, elixir-format
 msgid "January"
@@ -4346,3 +4337,38 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "September"
 msgstr ""
+
+#: lib/mv_web/live/member_live/index.html.heex
+#, elixir-autogen, elixir-format
+msgid "Click to sort by open payment cycles"
+msgstr ""
+
+#: lib/mv_web/live/components/add_filter_builder_component.ex
+#, elixir-autogen, elixir-format
+msgid "Last 12 months"
+msgstr ""
+
+#: lib/mv_web/live/components/add_filter_builder_component.ex
+#, elixir-autogen, elixir-format
+msgid "Last 3 months"
+msgstr ""
+
+#: lib/mv_web/live/components/add_filter_builder_component.ex
+#, elixir-autogen, elixir-format
+msgid "Last 7 days"
+msgstr ""
+
+#: lib/mv_web/live/components/add_filter_builder_component.ex
+#, elixir-autogen, elixir-format
+msgid "This quarter"
+msgstr ""
+
+#: lib/mv_web/live/member_live/index/payment_aging.ex
+#, elixir-autogen, elixir-format
+msgid "Fees across all outstanding cycles"
+msgstr ""
+
+#: lib/mv_web/live/member_live/index/payment_aging.ex
+#, elixir-autogen, elixir-format
+msgid "Fees in period %{from}–%{to}"
+msgstr ""
diff --git a/test/mv_web/member_live/index_date_presets_property_test.exs b/test/mv_web/member_live/index_date_presets_property_test.exs
new file mode 100644
index 00000000..94c9c69d
--- /dev/null
+++ b/test/mv_web/member_live/index_date_presets_property_test.exs
@@ -0,0 +1,66 @@
+defmodule MvWeb.MemberLive.IndexDatePresetsPropertyTest do
+  @moduledoc """
+  §2.8 — Relative date-range preset resolution.
+
+  For any preset evaluated against any reference date "today", the resolved
+  `{from, to}` matches the preset's definition: rolling "last N days" windows end
+  on today, and the "this month/quarter/year" presets run period-to-date from the
+  respective period start to today.
+  """
+  use ExUnit.Case, async: true
+  use ExUnitProperties
+
+  alias MvWeb.MemberLive.Index.DatePresets
+
+  defp date_gen do
+    gen all(
+          year <- StreamData.integer(2000..2100),
+          month <- StreamData.integer(1..12),
+          day <- StreamData.integer(1..28)
+        ) do
+      Date.new!(year, month, day)
+    end
+  end
+
+  property "last-N-days presets end on today and span N days inclusive" do
+    check all(today <- date_gen()) do
+      assert DatePresets.resolve(:last_7_days, today) == %{from: Date.add(today, -6), to: today}
+      assert DatePresets.resolve(:last_30_days, today) == %{from: Date.add(today, -29), to: today}
+    end
+  end
+
+  property "last-N-months presets shift the start back N months and end on today" do
+    check all(today <- date_gen()) do
+      assert DatePresets.resolve(:last_3_months, today) ==
+               %{from: Date.shift(today, month: -3), to: today}
+
+      assert DatePresets.resolve(:last_12_months, today) ==
+               %{from: Date.shift(today, month: -12), to: today}
+    end
+  end
+
+  property "this-period presets run from the period start to today" do
+    check all(today <- date_gen()) do
+      month_start = %{today | day: 1}
+      q_first_month = div(today.month - 1, 3) * 3 + 1
+      quarter_start = Date.new!(today.year, q_first_month, 1)
+      year_start = Date.new!(today.year, 1, 1)
+
+      assert DatePresets.resolve(:this_month, today) == %{from: month_start, to: today}
+      assert DatePresets.resolve(:this_quarter, today) == %{from: quarter_start, to: today}
+      assert DatePresets.resolve(:this_year, today) == %{from: year_start, to: today}
+    end
+  end
+
+  test "all/0 lists every resolvable preset key in display order" do
+    assert DatePresets.all() == [
+             :last_7_days,
+             :last_30_days,
+             :last_3_months,
+             :last_12_months,
+             :this_month,
+             :this_quarter,
+             :this_year
+           ]
+  end
+end
diff --git a/test/mv_web/member_live/index_date_presets_test.exs b/test/mv_web/member_live/index_date_presets_test.exs
index ce30fe35..f8470b81 100644
--- a/test/mv_web/member_live/index_date_presets_test.exs
+++ b/test/mv_web/member_live/index_date_presets_test.exs
@@ -1,8 +1,8 @@
 defmodule MvWeb.MemberLive.IndexDatePresetsTest do
   @moduledoc """
-  §1.8 — a date field's value control offers presets; picking "This year"
-  applies the Jan 1 – Dec 31 range of the current year and writes the equivalent
-  range params to the URL.
+  §1.25 (supersedes §1.8) — a date field's value control offers relative
+  presets; picking "This year" applies the period-to-date range (Jan 1 – today)
+  of the current year and writes the equivalent range params to the URL.
   """
   use MvWeb.ConnCase, async: false
 
@@ -20,7 +20,7 @@ defmodule MvWeb.MemberLive.IndexDatePresetsTest do
     %{conn: conn_with_oidc_user(conn)}
   end
 
-  test "the 'This year' preset applies the current-year range and writes URL params", %{
+  test "the 'This year' preset applies the year-to-date range and writes URL params", %{
     conn: conn
   } do
     {:ok, view, _html} = live(conn, ~p"/members")
@@ -32,8 +32,20 @@ defmodule MvWeb.MemberLive.IndexDatePresetsTest do
     view |> element("[data-testid='date-preset-this_year']") |> render_click()
 
     path = assert_patch(view)
-    year = Date.utc_today().year
-    assert path =~ "jd_from=#{year}-01-01"
-    assert path =~ "jd_to=#{year}-12-31"
+    today = Date.utc_today()
+    assert path =~ "jd_from=#{today.year}-01-01"
+    assert path =~ "jd_to=#{Date.to_iso8601(today)}"
+  end
+
+  test "the 'Last 30 days' preset applies a today-anchored 30-day window", %{conn: conn} do
+    {:ok, view, _html} = live(conn, ~p"/members")
+
+    pick_field(view, "join_date")
+    view |> element("[data-testid='date-preset-last_30_days']") |> render_click()
+
+    path = assert_patch(view)
+    today = Date.utc_today()
+    assert path =~ "jd_from=#{Date.to_iso8601(Date.add(today, -29))}"
+    assert path =~ "jd_to=#{Date.to_iso8601(today)}"
   end
 end
diff --git a/test/mv_web/member_live/index_filter_url_roundtrip_test.exs b/test/mv_web/member_live/index_filter_url_roundtrip_test.exs
new file mode 100644
index 00000000..8fe3405a
--- /dev/null
+++ b/test/mv_web/member_live/index_filter_url_roundtrip_test.exs
@@ -0,0 +1,38 @@
+defmodule MvWeb.MemberLive.IndexFilterUrlRoundtripTest do
+  @moduledoc """
+  §2.1 (extended) — the v2 filter keys survive the LiveView decode→encode round
+  trip. Loading `/members` with a Stichtag date, the suspended flag, and a
+  two-sided payment count range, then triggering an unrelated re-patch (a sort
+  click), preserves every one of those keys in the pushed URL.
+  """
+  use MvWeb.ConnCase, async: false
+
+  import Phoenix.LiveViewTest
+
+  setup %{conn: conn} do
+    actor = Mv.Helpers.SystemActor.get_system_actor()
+
+    {:ok, _member} =
+      Mv.Membership.create_member(
+        %{first_name: "Round", last_name: "Trip", email: "roundtrip@example.com"},
+        actor: actor
+      )
+
+    %{conn: conn_with_oidc_user(conn)}
+  end
+
+  test "stichtag, suspended and payment count range persist through a re-patch", %{conn: conn} do
+    url = "/members?stichtag=2026-03-15&suspended=1&pay_filter=has_unpaid&pay_min=2&pay_max=4"
+    {:ok, view, _html} = live(conn, url)
+
+    # Trigger an unrelated URL re-patch by sorting a stable column.
+    view |> element("[data-testid='payment']") |> render_click()
+    path = assert_patch(view)
+
+    assert path =~ "stichtag=2026-03-15"
+    assert path =~ "suspended=1"
+    assert path =~ "pay_filter=has_unpaid"
+    assert path =~ "pay_min=2"
+    assert path =~ "pay_max=4"
+  end
+end
diff --git a/test/mv_web/member_live/index_group_or_test.exs b/test/mv_web/member_live/index_group_or_test.exs
new file mode 100644
index 00000000..ece478e1
--- /dev/null
+++ b/test/mv_web/member_live/index_group_or_test.exs
@@ -0,0 +1,72 @@
+defmodule MvWeb.MemberLive.IndexGroupOrTest do
+  @moduledoc """
+  §1.29 / §2.7 — Multi-select group semantics is OR.
+
+  Two "is" group selections match members in *either* group (union). Two
+  "is not" selections exclude members in *any* of them. Verified at the
+  `OverviewQuery` layer where the semantics live.
+  """
+  use Mv.DataCase, async: false
+
+  import Mv.Fixtures, only: [member_fixture_with_actor: 2, group_fixture: 1]
+
+  alias Mv.Membership.Member
+  alias Mv.Membership.MemberGroup
+  alias MvWeb.MemberLive.Index.OverviewQuery
+
+  setup do
+    actor = Mv.Helpers.SystemActor.get_system_actor()
+    Member |> Ash.read!(actor: actor) |> Enum.each(&Ash.destroy!(&1, actor: actor))
+
+    g1 = group_fixture(%{name: "G1-#{System.unique_integer([:positive])}"})
+    g2 = group_fixture(%{name: "G2-#{System.unique_integer([:positive])}"})
+
+    m1 = member_fixture_with_actor(%{}, actor)
+    m2 = member_fixture_with_actor(%{}, actor)
+    m3 = member_fixture_with_actor(%{}, actor)
+
+    add_to_group(m1, g1, actor)
+    add_to_group(m2, g2, actor)
+
+    %{actor: actor, g1: g1, g2: g2, m1: m1, m2: m2, m3: m3}
+  end
+
+  defp add_to_group(member, group, actor) do
+    MemberGroup
+    |> Ash.Changeset.for_create(:create, %{member_id: member.id, group_id: group.id})
+    |> Ash.create!(actor: actor)
+  end
+
+  defp ids(opts, actor) do
+    opts
+    |> OverviewQuery.build()
+    |> Ash.read!(actor: actor)
+    |> MapSet.new(& &1.id)
+  end
+
+  test "two 'is' group selections match members in either group (OR)", ctx do
+    result =
+      ids(
+        %{
+          group_filters: %{to_string(ctx.g1.id) => :in, to_string(ctx.g2.id) => :in},
+          groups: [ctx.g1, ctx.g2]
+        },
+        ctx.actor
+      )
+
+    assert MapSet.equal?(result, MapSet.new([ctx.m1.id, ctx.m2.id]))
+  end
+
+  test "two 'is not' group selections exclude members in any of them", ctx do
+    result =
+      ids(
+        %{
+          group_filters: %{to_string(ctx.g1.id) => :not_in, to_string(ctx.g2.id) => :not_in},
+          groups: [ctx.g1, ctx.g2]
+        },
+        ctx.actor
+      )
+
+    assert MapSet.equal?(result, MapSet.new([ctx.m3.id]))
+  end
+end
diff --git a/test/mv_web/member_live/index_groups_filter_test.exs b/test/mv_web/member_live/index_groups_filter_test.exs
index 639b3992..6bf133af 100644
--- a/test/mv_web/member_live/index_groups_filter_test.exs
+++ b/test/mv_web/member_live/index_groups_filter_test.exs
@@ -3,8 +3,8 @@ defmodule MvWeb.MemberLive.IndexGroupsFilterTest do
   Tests for filtering members by group in the member overview.
 
   Uses the filter dropdown (MemberFilterComponent) with one row per group:
-  All / Yes / No (per group). Multiple active group filters combine with AND
-  (member must match all selected group conditions).
+  All / Yes / No (per group). Multiple "is" selections combine with OR (union),
+  while each "is not" selection excludes members in that group (§1.29/§2.7).
   """
   # Kept async: false as a deferred scope decision. The deferrable-FK migration
   # removed the concurrent-create_member deadlock that previously forced this, so
diff --git a/test/mv_web/member_live/index_payment_count_codec_test.exs b/test/mv_web/member_live/index_payment_count_codec_test.exs
new file mode 100644
index 00000000..fa2c6cd0
--- /dev/null
+++ b/test/mv_web/member_live/index_payment_count_codec_test.exs
@@ -0,0 +1,41 @@
+defmodule MvWeb.MemberLive.IndexPaymentCountCodecTest do
+  @moduledoc """
+  §1.22 / §3.14 — URL codec for the two-sided payment open-cycle count range.
+
+  The `{:unpaid_range, min, max}` filter round-trips through the flat URL
+  contract: encoding to params then decoding yields the canonical filter, with
+  the "has open" default (`min=1`, `max=nil`) and both-bounded ranges covered.
+  """
+  use ExUnit.Case, async: true
+
+  alias MvWeb.MemberLive.Index.PaymentAging
+
+  defp roundtrip(filter),
+    do: filter |> PaymentAging.filter_to_params() |> PaymentAging.parse_filter_params()
+
+  test "default has-open range (min 1, unbounded above) round-trips" do
+    assert roundtrip({:unpaid_range, 1, nil}) == {:unpaid_range, 1, nil}
+  end
+
+  test "two-sided range round-trips" do
+    assert roundtrip({:unpaid_range, 2, 5}) == {:unpaid_range, 2, 5}
+  end
+
+  test "exact single-value range round-trips" do
+    assert roundtrip({:unpaid_range, 3, 3}) == {:unpaid_range, 3, 3}
+  end
+
+  test "has_unpaid params decode into an unpaid_range" do
+    params = %{"pay_filter" => "has_unpaid", "pay_min" => "2", "pay_max" => "4"}
+    assert PaymentAging.parse_filter_params(params) == {:unpaid_range, 2, 4}
+  end
+
+  test "has_unpaid with no bounds defaults to min 1, max nil" do
+    assert PaymentAging.parse_filter_params(%{"pay_filter" => "has_unpaid"}) ==
+             {:unpaid_range, 1, nil}
+  end
+
+  test "fully_paid still round-trips" do
+    assert roundtrip(:fully_paid) == :fully_paid
+  end
+end
diff --git a/test/mv_web/member_live/index_payment_filter_test.exs b/test/mv_web/member_live/index_payment_filter_test.exs
index f1b09fea..31ae2827 100644
--- a/test/mv_web/member_live/index_payment_filter_test.exs
+++ b/test/mv_web/member_live/index_payment_filter_test.exs
@@ -66,6 +66,24 @@ defmodule MvWeb.MemberLive.IndexPaymentFilterTest do
     refute MapSet.member?(ids({:has_unpaid, 1}, actor), zero.id)
   end
 
+  test "unpaid-range selects members whose in-period count is within [min, max]", %{
+    actor: actor,
+    ft: ft
+  } do
+    zero = member_with_unpaid(0, actor, ft)
+    one = member_with_unpaid(1, actor, ft)
+    two = member_with_unpaid(2, actor, ft)
+    three = member_with_unpaid(3, actor, ft)
+
+    # two-sided: 2..3
+    assert ids({:unpaid_range, 2, 3}, actor) == MapSet.new([two.id, three.id])
+    # lower-bounded only: >= 1 (max nil)
+    assert ids({:unpaid_range, 1, nil}, actor) == MapSet.new([one.id, two.id, three.id])
+    # exact single value: 1..1
+    assert ids({:unpaid_range, 1, 1}, actor) == MapSet.new([one.id])
+    refute MapSet.member?(ids({:unpaid_range, 1, nil}, actor), zero.id)
+  end
+
   test "suspended cycles do not count toward has-unpaid", %{actor: actor, ft: ft} do
     member = member_fixture_with_actor(%{}, actor)
     create_cycle(member, ft, %{cycle_start: ~D[2024-01-01], status: :suspended}, actor)
diff --git a/test/mv_web/member_live/index_payment_period_test.exs b/test/mv_web/member_live/index_payment_period_test.exs
index 7752b307..5f1977ac 100644
--- a/test/mv_web/member_live/index_payment_period_test.exs
+++ b/test/mv_web/member_live/index_payment_period_test.exs
@@ -40,6 +40,43 @@ defmodule MvWeb.MemberLive.IndexPaymentPeriodTest do
     end
   end
 
+  describe "period short code (§1.28)" do
+    test "the all-outstanding default has no short code" do
+      assert PaymentAging.period_short_code(%{from: nil, to: nil}) == nil
+    end
+
+    test "a full calendar year renders as the year" do
+      assert PaymentAging.period_short_code(%{from: ~D[2026-01-01], to: ~D[2026-12-31]}) == "2026"
+    end
+
+    test "a full calendar quarter renders as Q# YYYY" do
+      assert PaymentAging.period_short_code(%{from: ~D[2026-01-01], to: ~D[2026-03-31]}) ==
+               "Q1 2026"
+
+      assert PaymentAging.period_short_code(%{from: ~D[2026-10-01], to: ~D[2026-12-31]}) ==
+               "Q4 2026"
+    end
+
+    test "an arbitrary bounded period has no compact short code" do
+      assert PaymentAging.period_short_code(%{from: ~D[2026-02-03], to: ~D[2026-08-17]}) == nil
+      # An open-ended period is not compactly codeable either.
+      assert PaymentAging.period_short_code(%{from: ~D[2026-01-01], to: nil}) == nil
+    end
+  end
+
+  describe "period tooltip (§1.28)" do
+    test "names the period with locally formatted bounds" do
+      tip = PaymentAging.period_tooltip(%{from: ~D[2026-01-01], to: ~D[2026-12-31]})
+      assert tip =~ "01.01.2026"
+      assert tip =~ "31.12.2026"
+    end
+
+    test "the all-outstanding default reads as all outstanding" do
+      tip = PaymentAging.period_tooltip(%{from: nil, to: nil})
+      assert is_binary(tip) and tip =~ "outstanding"
+    end
+  end
+
   describe "payment-count filter codec" do
     test "round-trips fully_paid and has-unpaid thresholds" do
       for state <- [:fully_paid, {:has_unpaid, 1}, {:has_unpaid, 2}, {:has_unpaid, 3}] do
diff --git a/test/mv_web/member_live/index_payment_sort_test.exs b/test/mv_web/member_live/index_payment_sort_test.exs
new file mode 100644
index 00000000..1ef14114
--- /dev/null
+++ b/test/mv_web/member_live/index_payment_sort_test.exs
@@ -0,0 +1,85 @@
+defmodule MvWeb.MemberLive.IndexPaymentSortTest do
+  @moduledoc """
+  §1.27 — The Beiträge (payment) column sorts DB-side by the period-scoped
+  unpaid-cycle count, ascending and descending, with the unique id tie-breaker
+  preserving keyset stability. Verified at the `OverviewQuery` layer.
+  """
+  use MvWeb.ConnCase, async: false
+
+  import Phoenix.LiveViewTest
+  import Mv.Fixtures, only: [create_fee_type: 2, member_fixture_with_actor: 2, create_cycle: 4]
+
+  alias Mv.Membership.Member
+  alias MvWeb.MemberLive.Index.OverviewQuery
+
+  @period %{from: ~D[2024-01-01], to: ~D[2024-12-31]}
+
+  setup do
+    actor = Mv.Helpers.SystemActor.get_system_actor()
+    ft = create_fee_type(%{interval: :monthly}, actor)
+    Member |> Ash.read!(actor: actor) |> Enum.each(&Ash.destroy!(&1, actor: actor))
+    %{actor: actor, ft: ft}
+  end
+
+  defp member_with_unpaid(n, ctx) do
+    member = member_fixture_with_actor(%{}, ctx.actor)
+
+    Enum.each(1..max(n, 0)//1, fn i ->
+      create_cycle(
+        member,
+        ctx.ft,
+        %{cycle_start: Date.new!(2024, i, 1), status: :unpaid},
+        ctx.actor
+      )
+    end)
+
+    member
+  end
+
+  defp sorted_ids(order, ctx) do
+    %{sort_field: :payment, sort_order: order, payment_period: @period}
+    |> OverviewQuery.build()
+    |> Ash.read!(actor: ctx.actor)
+    |> Enum.map(& &1.id)
+  end
+
+  test "sorts ascending by in-period unpaid count", ctx do
+    zero = member_with_unpaid(0, ctx)
+    one = member_with_unpaid(1, ctx)
+    two = member_with_unpaid(2, ctx)
+
+    assert sorted_ids(:asc, ctx) == [zero.id, one.id, two.id]
+  end
+
+  test "sorts descending by in-period unpaid count", ctx do
+    zero = member_with_unpaid(0, ctx)
+    one = member_with_unpaid(1, ctx)
+    two = member_with_unpaid(2, ctx)
+
+    assert sorted_ids(:desc, ctx) == [two.id, one.id, zero.id]
+  end
+
+  describe "payment sort header (LiveView)" do
+    setup %{conn: conn} do
+      %{conn: conn_with_oidc_user(conn)}
+    end
+
+    @tag :ui
+    test "clicking the payment header reflects the sort in the URL", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/members")
+
+      view |> element("[data-testid='payment']") |> render_click()
+
+      path = assert_patch(view)
+      assert path =~ "sort_field=payment"
+      assert path =~ "sort_order=asc"
+    end
+
+    @tag :ui
+    test "the payment th exposes aria-sort when active", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/members?sort_field=payment&sort_order=desc")
+
+      assert has_element?(view, "th[aria-sort='descending']")
+    end
+  end
+end
diff --git a/test/mv_web/member_live/index_payment_wiring_test.exs b/test/mv_web/member_live/index_payment_wiring_test.exs
index 8991ca08..8c7b0547 100644
--- a/test/mv_web/member_live/index_payment_wiring_test.exs
+++ b/test/mv_web/member_live/index_payment_wiring_test.exs
@@ -69,4 +69,25 @@ defmodule MvWeb.MemberLive.IndexPaymentWiringTest do
     {:ok, all_time, _} = live(ctx.conn, "/members?pay_filter=unpaid_1")
     assert has_element?(all_time, "#row-#{member.id}")
   end
+
+  describe "period indicator badge (§1.28)" do
+    test "no badge in the default all-outstanding scope", ctx do
+      {:ok, view, _} = live(ctx.conn, "/members")
+      refute has_element?(view, "[data-testid='payment-period-badge']")
+    end
+
+    test "a full year renders the compact year short code", ctx do
+      {:ok, view, _} = live(ctx.conn, "/members?pay_from=2026-01-01&pay_to=2026-12-31")
+
+      assert has_element?(view, "[data-testid='payment-period-badge']", "2026")
+    end
+
+    test "an arbitrary period falls back to a 'filtered' badge with a period tooltip", ctx do
+      {:ok, view, _} = live(ctx.conn, "/members?pay_from=2026-02-03&pay_to=2026-08-17")
+
+      badge = view |> element("[data-testid='payment-period-badge']") |> render()
+      assert badge =~ "03.02.2026"
+      assert badge =~ "17.08.2026"
+    end
+  end
 end
diff --git a/test/mv_web/member_live/index_status_params_codec_test.exs b/test/mv_web/member_live/index_status_params_codec_test.exs
new file mode 100644
index 00000000..b1438969
--- /dev/null
+++ b/test/mv_web/member_live/index_status_params_codec_test.exs
@@ -0,0 +1,40 @@
+defmodule MvWeb.MemberLive.IndexStatusParamsCodecTest do
+  @moduledoc """
+  §2.1 (extended) — URL codec round-trip for the new v2 filter keys: the
+  point-in-time Stichtag date and the suspended-status flag. Encoding a state to
+  params then decoding yields the canonical state, and the default (no filter)
+  encodes to the empty map so a fresh URL is canonical.
+  """
+  use ExUnit.Case, async: true
+
+  alias MvWeb.MemberLive.Index.PaymentAging
+  alias MvWeb.MemberLive.Index.Stichtag
+
+  describe "Stichtag date" do
+    test "a set date round-trips" do
+      date = ~D[2026-03-15]
+      assert date |> Stichtag.to_params() |> Stichtag.parse() == date
+    end
+
+    test "nil encodes to the empty map and decodes to nil" do
+      assert Stichtag.to_params(nil) == %{}
+      assert Stichtag.parse(%{}) == nil
+    end
+
+    test "a malformed date param decodes to nil" do
+      assert Stichtag.parse(%{"stichtag" => "not-a-date"}) == nil
+    end
+  end
+
+  describe "suspended flag" do
+    test "true round-trips" do
+      assert true |> PaymentAging.suspended_to_params() |> PaymentAging.parse_suspended() == true
+    end
+
+    test "false/nil encodes to the empty map and decodes to false" do
+      assert PaymentAging.suspended_to_params(false) == %{}
+      assert PaymentAging.suspended_to_params(nil) == %{}
+      assert PaymentAging.parse_suspended(%{}) == false
+    end
+  end
+end
diff --git a/test/mv_web/member_live/index_stichtag_property_test.exs b/test/mv_web/member_live/index_stichtag_property_test.exs
new file mode 100644
index 00000000..017d08fb
--- /dev/null
+++ b/test/mv_web/member_live/index_stichtag_property_test.exs
@@ -0,0 +1,78 @@
+defmodule MvWeb.MemberLive.IndexStichtagPropertyTest do
+  @moduledoc """
+  §2.6 — Point-in-time membership ("member on the reference date X").
+
+  For arbitrary (join_date, exit_date) pairs and reference dates X, the Stichtag
+  filter keeps a member iff `join_date <= X and (exit_date is nil or exit_date > X)`.
+  Verified at the `OverviewQuery` layer against an in-memory oracle.
+  """
+  use Mv.DataCase, async: false
+  use ExUnitProperties
+
+  import Mv.Fixtures, only: [member_fixture_with_actor: 2]
+
+  alias Mv.Membership.Member
+  alias MvWeb.MemberLive.Index.OverviewQuery
+
+  @dates [
+    ~D[2023-01-01],
+    ~D[2024-06-15],
+    ~D[2025-01-01],
+    ~D[2025-06-15],
+    ~D[2026-01-01]
+  ]
+
+  defp clear(actor) do
+    Member |> Ash.read!(actor: actor) |> Enum.each(&Ash.destroy!(&1, actor: actor))
+  end
+
+  defp on_date?(join, exit_date, x) do
+    Date.compare(join, x) != :gt and (is_nil(exit_date) or Date.compare(exit_date, x) == :gt)
+  end
+
+  # Generates a (join_date, exit_date) pair where exit_date is nil or on/after
+  # join_date, so it satisfies the Member "exit not before join" validation.
+  defp valid_pair_gen do
+    StreamData.bind(StreamData.member_of(@dates), fn join ->
+      later = [nil | Enum.filter(@dates, &(Date.compare(&1, join) == :gt))]
+
+      StreamData.bind(StreamData.member_of(later), fn exit_date ->
+        StreamData.constant({join, exit_date})
+      end)
+    end)
+  end
+
+  property "Stichtag filter keeps exactly the members active on X" do
+    actor = Mv.Helpers.SystemActor.get_system_actor()
+
+    check all(
+            specs <- StreamData.list_of(valid_pair_gen(), min_length: 1, max_length: 5),
+            x <- StreamData.member_of(@dates),
+            max_runs: 25
+          ) do
+      clear(actor)
+
+      created =
+        Enum.map(specs, fn {join, exit_date} ->
+          member =
+            member_fixture_with_actor(%{join_date: join, exit_date: exit_date}, actor)
+
+          {member.id, join, exit_date}
+        end)
+
+      expected =
+        for {id, join, exit_date} <- created,
+            on_date?(join, exit_date, x),
+            into: MapSet.new(),
+            do: id
+
+      actual =
+        %{stichtag: x}
+        |> OverviewQuery.build()
+        |> Ash.read!(actor: actor)
+        |> MapSet.new(& &1.id)
+
+      assert MapSet.equal?(actual, expected)
+    end
+  end
+end
diff --git a/test/mv_web/member_live/index_suspended_filter_test.exs b/test/mv_web/member_live/index_suspended_filter_test.exs
new file mode 100644
index 00000000..add447f9
--- /dev/null
+++ b/test/mv_web/member_live/index_suspended_filter_test.exs
@@ -0,0 +1,58 @@
+defmodule MvWeb.MemberLive.IndexSuspendedFilterTest do
+  @moduledoc """
+  §1.23 — Filter by `suspended` status.
+
+  With the suspended filter active, the overview keeps members that have at
+  least one `suspended` cycle whose `cycle_end` falls in the active period.
+  Suspended is filterable as its own status, independent of the unpaid count
+  (which excludes suspended, §2.5). Verified at the `OverviewQuery` layer.
+  """
+  use Mv.DataCase, async: false
+
+  import Mv.Fixtures, only: [member_fixture_with_actor: 2, create_fee_type: 2, create_cycle: 4]
+
+  alias Mv.Membership.Member
+  alias MvWeb.MemberLive.Index.OverviewQuery
+
+  setup do
+    actor = Mv.Helpers.SystemActor.get_system_actor()
+    Member |> Ash.read!(actor: actor) |> Enum.each(&Ash.destroy!(&1, actor: actor))
+    ft = create_fee_type(%{interval: :yearly}, actor)
+    %{actor: actor, ft: ft}
+  end
+
+  defp member_with_cycle(ctx, status, cycle_start) do
+    m = member_fixture_with_actor(%{}, ctx.actor)
+    create_cycle(m, ctx.ft, %{cycle_start: cycle_start, status: status}, ctx.actor)
+    m
+  end
+
+  defp ids(opts, actor) do
+    opts |> OverviewQuery.build() |> Ash.read!(actor: actor) |> MapSet.new(& &1.id)
+  end
+
+  test "keeps members with a suspended cycle whose cycle_end is in the period", ctx do
+    suspended_in = member_with_cycle(ctx, :suspended, ~D[2025-01-01])
+    _unpaid = member_with_cycle(ctx, :unpaid, ~D[2025-01-01])
+    _paid = member_with_cycle(ctx, :paid, ~D[2025-01-01])
+    _suspended_out = member_with_cycle(ctx, :suspended, ~D[2023-01-01])
+
+    result =
+      ids(
+        %{suspended: true, payment_period: %{from: ~D[2025-01-01], to: ~D[2025-12-31]}},
+        ctx.actor
+      )
+
+    assert MapSet.equal?(result, MapSet.new([suspended_in.id]))
+  end
+
+  test "all-time period keeps every member with any suspended cycle", ctx do
+    s1 = member_with_cycle(ctx, :suspended, ~D[2025-01-01])
+    s2 = member_with_cycle(ctx, :suspended, ~D[2023-01-01])
+    _unpaid = member_with_cycle(ctx, :unpaid, ~D[2025-01-01])
+
+    result = ids(%{suspended: true, payment_period: %{from: nil, to: nil}}, ctx.actor)
+
+    assert MapSet.equal?(result, MapSet.new([s1.id, s2.id]))
+  end
+end