diff --git a/app/components/DS/menu.html.erb b/app/components/DS/menu.html.erb
index d4f0ea8d8..ed6490184 100644
--- a/app/components/DS/menu.html.erb
+++ b/app/components/DS/menu.html.erb
@@ -1,4 +1,4 @@
-<%= tag.div data: { controller: "DS--menu", DS__menu_placement_value: placement, DS__menu_offset_value: offset, testid: testid } do %>
+<%= tag.div data: { controller: "DS--menu", DS__menu_placement_value: placement, DS__menu_offset_value: offset, DS__menu_mobile_fullwidth_value: mobile_fullwidth, testid: testid } do %>
   <% if variant == :icon %>
     <%= render DS::Button.new(variant: "icon", icon: icon_vertical ? "more-vertical" : "more-horizontal", data: { DS__menu_target: "button" }) %>
   <% elsif variant == :button %>
@@ -12,7 +12,7 @@
   <% end %>
 
   <div data-DS--menu-target="content" class="px-2 lg:px-0 max-w-full hidden z-50">
-    <div class="mx-auto min-w-[200px] shadow-border-xs bg-container rounded-lg">
+    <%= tag.div class: "mx-auto min-w-[200px] shadow-border-xs bg-container rounded-lg", style: ("max-width: #{max_width}" if max_width) do %>
       <%= header %>
 
       <%= tag.div class: class_names("py-1" => !no_padding) do %>
@@ -22,6 +22,6 @@
 
         <%= custom_content %>
       <% end %>
-    </div>
+    <% end %>
   </div>
 <% end %>
diff --git a/app/components/DS/menu.rb b/app/components/DS/menu.rb
index 39ef35e97..32a14a472 100644
--- a/app/components/DS/menu.rb
+++ b/app/components/DS/menu.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class DS::Menu < DesignSystemComponent
-  attr_reader :variant, :avatar_url, :initials, :placement, :offset, :icon_vertical, :no_padding, :testid
+  attr_reader :variant, :avatar_url, :initials, :placement, :offset, :icon_vertical, :no_padding, :testid, :mobile_fullwidth, :max_width
 
   renders_one :button, ->(**button_options, &block) do
     options_with_target = button_options.merge(data: { DS__menu_target: "button" })
@@ -23,7 +23,7 @@ class DS::Menu < DesignSystemComponent
 
   VARIANTS = %i[icon button avatar].freeze
 
-  def initialize(variant: "icon", avatar_url: nil, initials: nil, placement: "bottom-end", offset: 12, icon_vertical: false, no_padding: false, testid: nil)
+  def initialize(variant: "icon", avatar_url: nil, initials: nil, placement: "bottom-end", offset: 12, icon_vertical: false, no_padding: false, testid: nil, mobile_fullwidth: true, max_width: nil)
     @variant = variant.to_sym
     @avatar_url = avatar_url
     @initials = initials
@@ -32,6 +32,8 @@ class DS::Menu < DesignSystemComponent
     @icon_vertical = icon_vertical
     @no_padding = no_padding
     @testid = testid
+    @mobile_fullwidth = mobile_fullwidth
+    @max_width = max_width
 
     raise ArgumentError, "Invalid variant: #{@variant}" unless VARIANTS.include?(@variant)
   end
diff --git a/app/components/DS/menu_controller.js b/app/components/DS/menu_controller.js
index 512358f6c..33d3714ef 100644
--- a/app/components/DS/menu_controller.js
+++ b/app/components/DS/menu_controller.js
@@ -16,6 +16,7 @@ export default class extends Controller {
     show: Boolean,
     placement: { type: String, default: "bottom-end" },
     offset: { type: Number, default: 6 },
+    mobileFullwidth: { type: Boolean, default: true },
   };
 
   connect() {
@@ -105,13 +106,14 @@ export default class extends Controller {
     if (!this.buttonTarget || !this.contentTarget) return;
 
     const isSmallScreen = !window.matchMedia("(min-width: 768px)").matches;
+    const useMobileFullwidth = isSmallScreen && this.mobileFullwidthValue;
 
     computePosition(this.buttonTarget, this.contentTarget, {
-      placement: isSmallScreen ? "bottom" : this.placementValue,
+      placement: useMobileFullwidth ? "bottom" : this.placementValue,
       middleware: [offset(this.offsetValue), shift({ padding: 5 })],
       strategy: "fixed",
     }).then(({ x, y }) => {
-      if (isSmallScreen) {
+      if (useMobileFullwidth) {
         Object.assign(this.contentTarget.style, {
           position: "fixed",
           left: "0px",
diff --git a/app/controllers/accounts_controller.rb b/app/controllers/accounts_controller.rb
index 6b9ba590c..5fcb3df66 100644
--- a/app/controllers/accounts_controller.rb
+++ b/app/controllers/accounts_controller.rb
@@ -1,5 +1,5 @@
 class AccountsController < ApplicationController
-  before_action :set_account, only: %i[sync sparkline toggle_active show destroy unlink confirm_unlink select_provider]
+  before_action :set_account, only: %i[sync sparkline toggle_active set_default remove_default show destroy unlink confirm_unlink select_provider]
   include Periodable
 
   def index
@@ -89,6 +89,21 @@ class AccountsController < ApplicationController
     redirect_to accounts_path
   end
 
+  def set_default
+    unless @account.eligible_for_transaction_default?
+      redirect_to accounts_path, alert: t("accounts.set_default.depository_only")
+      return
+    end
+
+    Current.user.update!(default_account: @account)
+    redirect_to accounts_path
+  end
+
+  def remove_default
+    Current.user.update!(default_account: nil)
+    redirect_to accounts_path
+  end
+
   def destroy
     if @account.linked?
       redirect_to account_path(@account), alert: t("accounts.destroy.cannot_delete_linked")
diff --git a/app/models/account.rb b/app/models/account.rb
index 63afce7d7..45a4635e4 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -310,6 +310,14 @@ class Account < ApplicationRecord
     accountable_class.long_subtype_label_for(subtype) || accountable_class.display_name
   end
 
+  def supports_default?
+    depository? || credit_card?
+  end
+
+  def eligible_for_transaction_default?
+    supports_default? && active? && !linked?
+  end
+
   # Determines if this account supports manual trade entry
   # Investment accounts always support trades; Crypto only if subtype is "exchange"
   def supports_trades?
diff --git a/app/models/user.rb b/app/models/user.rb
index 24ce74a0b..9c6a1882c 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -24,6 +24,7 @@ class User < ApplicationRecord
 
   belongs_to :family
   belongs_to :last_viewed_chat, class_name: "Chat", optional: true
+  belongs_to :default_account, class_name: "Account", optional: true
   has_many :sessions, dependent: :destroy
   has_many :chats, dependent: :destroy
   has_many :api_keys, dependent: :destroy
@@ -244,6 +245,15 @@ class User < ApplicationRecord
     AccountOrder.find(default_account_order) || AccountOrder.default
   end
 
+  def default_account_for_transactions
+    return nil unless default_account_id.present?
+
+    account = default_account
+    return nil unless account&.eligible_for_transaction_default? && account.family_id == family_id
+
+    account
+  end
+
   # Dashboard preferences management
   def dashboard_section_collapsed?(section_key)
     preferences&.dig("collapsed_sections", section_key) == true
diff --git a/app/views/accounts/_account.html.erb b/app/views/accounts/_account.html.erb
index c9eadeb86..380bb53fd 100644
--- a/app/views/accounts/_account.html.erb
+++ b/app/views/accounts/_account.html.erb
@@ -1,7 +1,9 @@
 <%# locals: (account:, return_to: nil) %>
 
+<% is_default = Current.user&.default_account_id == account.id %>
+
 <%= turbo_frame_tag dom_id(account) do %>
-  <div class="p-4 flex items-center justify-between gap-3 group/account hover:bg-surface-hover">
+  <div class="relative p-4 flex items-center justify-between gap-3 group/account hover:bg-surface-hover">
     <div class="flex items-center gap-3">
       <%= render "accounts/logo", account: account, size: "md" %>
 
@@ -16,41 +18,26 @@
             </span>
           </p>
         <% else %>
-          <div>
+          <div class="flex items-center gap-1.5">
             <%= link_to account.name, account, class: [(account.active? ? "text-primary" : "text-subdued"), "text-sm font-medium hover:underline"], data: { turbo_frame: "_top" } %>
-            <% if account.institution_name %>
-              <span class="text-secondary">• <%= account.institution_name %></span>
+
+            <% if account.institution_name.present? %>
+              <span class="hidden sm:inline text-secondary">• <%= account.institution_name %></span>
             <% end %>
           </div>
           <% if account.long_subtype_label %>
             <p class="text-sm text-secondary truncate"><%= account.long_subtype_label %></p>
           <% end %>
+          <% if account.supports_default? && is_default %>
+            <p class="text-xs text-secondary opacity-50"><%= t("accounts.account.default_label") %></p>
+          <% end %>
+          <% if account.institution_name.present? %>
+            <p class="sm:hidden text-sm text-secondary truncate"><%= account.institution_name %></p>
+          <% end %>
         <% end %>
       </div>
-
-      <% unless account.pending_deletion? %>
-        <%= link_to edit_account_path(account, return_to: return_to), data: { turbo_frame: :modal }, class: "group-hover/account:flex hidden hover:opacity-80 items-center justify-center" do %>
-          <%= icon("pencil-line", size: "sm") %>
-        <% end %>
-
-        <% if !account.linked? && ["Depository", "CreditCard", "Investment", "Crypto"].include?(account.accountable_type) %>
-          <%= link_to select_provider_account_path(account),
-                      data: { turbo_frame: :modal },
-                      class: "group-hover/account:flex hidden hover:opacity-80 items-center justify-center gap-1",
-                      title: t("accounts.account.link_provider") do %>
-            <%= icon("link", size: "sm") %>
-          <% end %>
-        <% elsif account.linked? %>
-          <%= link_to confirm_unlink_account_path(account),
-                      data: { turbo_frame: :modal },
-                      class: "group-hover/account:flex hidden hover:opacity-80 items-center justify-center gap-1",
-                      title: t("accounts.account.unlink_provider") do %>
-            <%= icon("unlink", size: "sm") %>
-          <% end %>
-        <% end %>
-      <% end %>
     </div>
-    <div class="flex items-center gap-8">
+    <div class="flex items-center gap-4">
       <% if account.draft? %>
         <!-- Balance hidden for draft accounts -->
       <% elsif account.syncing? %>
@@ -68,14 +55,34 @@
           variant: :outline,
           frame: :modal
         ) %>
-      <% elsif account.active? || account.disabled? %>
-        <%= form_with model: account, url: toggle_active_account_path(account), method: :patch, data: { turbo_frame: "_top", controller: "auto-submit-form" } do |f| %>
-          <%= render DS::Toggle.new(
-            id: "account_#{account.id}_active",
-            name: "active",
-            checked: account.active?,
-            data: { auto_submit_form_target: "auto" }
-          ) %>
+      <% elsif !account.pending_deletion? %>
+        <%= render DS::Menu.new(icon_vertical: true, mobile_fullwidth: false, max_width: "280px") do |menu| %>
+          <% menu.with_item(variant: "link", text: t("accounts.account.edit"), href: edit_account_path(account, return_to: return_to), icon: "pencil-line", data: { turbo_frame: :modal }) %>
+
+          <% if !account.linked? && %w[Depository CreditCard Investment Crypto].include?(account.accountable_type) %>
+            <% menu.with_item(variant: "link", text: t("accounts.account.link_provider"), href: select_provider_account_path(account), icon: "link", data: { turbo_frame: :modal }) %>
+          <% elsif account.linked? %>
+            <% menu.with_item(variant: "link", text: t("accounts.account.unlink_provider"), href: confirm_unlink_account_path(account), icon: "unlink", data: { turbo_frame: :modal }) %>
+          <% end %>
+
+          <% menu.with_item(variant: "divider") %>
+
+          <% if account.active? %>
+            <% menu.with_item(variant: "button", text: t("accounts.account.disable"), href: toggle_active_account_path(account), method: :patch, icon: "toggle-right", data: { turbo_frame: :_top }) %>
+          <% elsif account.disabled? %>
+            <% menu.with_item(variant: "button", text: t("accounts.account.enable"), href: toggle_active_account_path(account), method: :patch, icon: "toggle-left", data: { turbo_frame: :_top }) %>
+          <% end %>
+
+          <% if is_default %>
+            <% menu.with_item(variant: "button", text: t("accounts.account.remove_default"), href: remove_default_account_path(account), method: :patch, icon: "star-off", data: { turbo_frame: :_top }) %>
+          <% elsif account.eligible_for_transaction_default? %>
+            <% menu.with_item(variant: "button", text: t("accounts.account.set_default"), href: set_default_account_path(account), method: :patch, icon: "star", data: { turbo_frame: :_top }) %>
+          <% end %>
+
+          <% unless account.linked? %>
+            <% menu.with_item(variant: "divider") %>
+            <% menu.with_item(variant: "button", text: t("accounts.account.delete"), href: account_path(account), method: :delete, icon: "trash-2", confirm: CustomConfirm.for_resource_deletion("account", high_severity: true), data: { turbo_frame: :_top }) %>
+          <% end %>
         <% end %>
       <% end %>
     </div>
diff --git a/app/views/transactions/_form.html.erb b/app/views/transactions/_form.html.erb
index 2717dd57c..7bfde6e9a 100644
--- a/app/views/transactions/_form.html.erb
+++ b/app/views/transactions/_form.html.erb
@@ -18,7 +18,7 @@
     <% if @entry.account_id %>
       <%= f.hidden_field :account_id %>
     <% else %>
-      <%= f.collection_select :account_id, Current.family.accounts.manual.active.alphabetically, :id, :name, { prompt: t(".account_prompt"), label: t(".account"), variant: :logo }, required: true, class: "form-field__input text-ellipsis" %>
+      <%= f.collection_select :account_id, Current.family.accounts.manual.active.alphabetically, :id, :name, { prompt: t(".account_prompt"), label: t(".account"), selected: Current.user.default_account_for_transactions&.id, variant: :logo }, required: true, class: "form-field__input text-ellipsis" %>
     <% end %>
 
     <%= f.money_field :amount, label: t(".amount"), required: true %>
diff --git a/config/locales/views/accounts/de.yml b/config/locales/views/accounts/de.yml
index 1b3e4d27b..f163a31b1 100644
--- a/config/locales/views/accounts/de.yml
+++ b/config/locales/views/accounts/de.yml
@@ -2,14 +2,23 @@
 de:
   accounts:
     account:
+      edit: Bearbeiten
       link_lunchflow: Mit Lunch Flow verknüpfen
       link_provider: Mit Provider verknüpfen
       unlink_provider: Von Provider trennen
       troubleshoot: Fehlerbehebung
+      enable: Konto aktivieren
+      disable: Konto deaktivieren
+      set_default: Als Standard festlegen
+      remove_default: Standard aufheben
+      default_label: Standard
+      delete: Konto löschen
     chart:
       data_not_available: Für den ausgewählten Zeitraum sind keine Daten verfügbar
     create:
       success: "%{type}-Konto erstellt"
+    set_default:
+      depository_only: "Nur Bargeld- und Kreditkartenkonten können als Standard festgelegt werden."
     destroy:
       success: "%{type}-Konto zur Löschung vorgemerkt"
       cannot_delete_linked: "Ein verknüpftes Konto kann nicht gelöscht werden. Bitte trennen Sie es zuerst."
diff --git a/config/locales/views/accounts/en.yml b/config/locales/views/accounts/en.yml
index 4e2d61faa..1a721e19a 100644
--- a/config/locales/views/accounts/en.yml
+++ b/config/locales/views/accounts/en.yml
@@ -2,14 +2,23 @@
 en:
   accounts:
     account:
+      edit: Edit
       link_lunchflow: Link with Lunch Flow
       link_provider: Link with provider
       unlink_provider: Unlink from provider
       troubleshoot: Troubleshoot
+      enable: Enable account
+      disable: Disable account
+      set_default: Set as default
+      remove_default: Unset default
+      default_label: Default
+      delete: Delete account
     chart:
       data_not_available: Data not available for the selected period
     create:
       success: "%{type} account created"
+    set_default:
+      depository_only: "Only cash and credit card accounts can be set as default."
     destroy:
       success: "%{type} account scheduled for deletion"
       cannot_delete_linked: "Cannot delete a linked account. Please unlink it first."
diff --git a/config/locales/views/accounts/es.yml b/config/locales/views/accounts/es.yml
index 2639652df..613bf93ce 100644
--- a/config/locales/views/accounts/es.yml
+++ b/config/locales/views/accounts/es.yml
@@ -2,14 +2,23 @@
 es:
   accounts:
     account:
+      edit: Editar
       link_lunchflow: Vincular con Lunch Flow
       link_provider: Vincular con proveedor
       unlink_provider: Desvincular de proveedor
       troubleshoot: Solucionar problemas
+      enable: Activar cuenta
+      disable: Desactivar cuenta
+      set_default: Establecer como predeterminada
+      remove_default: Quitar predeterminada
+      default_label: Predeterminada
+      delete: Eliminar cuenta
     chart:
       data_not_available: Datos no disponibles para el período seleccionado
     create:
       success: "Cuenta %{type} creada"
+    set_default:
+      depository_only: "Solo las cuentas de efectivo y tarjeta de crédito pueden establecerse como predeterminadas."
     destroy:
       success: "Cuenta %{type} programada para eliminación"
       cannot_delete_linked: "No se puede eliminar una cuenta vinculada. Por favor, desvincúlela primero."
diff --git a/config/locales/views/accounts/fr.yml b/config/locales/views/accounts/fr.yml
index 3c9dae3bb..7d2eafcb8 100644
--- a/config/locales/views/accounts/fr.yml
+++ b/config/locales/views/accounts/fr.yml
@@ -2,14 +2,23 @@
 fr:
   accounts:
     account:
+      edit: Modifier
       link_lunchflow: Lier avec Lunch Flow
       link_provider: Lier avec un fournisseur
       unlink_provider: Délier du fournisseur
       troubleshoot: Dépannage
+      enable: Activer le compte
+      disable: Désactiver le compte
+      set_default: Définir par défaut
+      remove_default: Retirer par défaut
+      default_label: Par défaut
+      delete: Supprimer le compte
     chart:
       data_not_available: Données non disponibles pour la période sélectionnée
     create:
       success: "Compte %{type} créé"
+    set_default:
+      depository_only: "Seuls les comptes de liquidités et de carte de crédit peuvent être définis par défaut."
     destroy:
       success: "Le compte %{type} a été préparé à la suppression"
       cannot_delete_linked: "Impossible de supprimer un compte lié. Veuillez d'abord le délier."
diff --git a/config/routes.rb b/config/routes.rb
index e3b494761..b4576b907 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -330,6 +330,8 @@ Rails.application.routes.draw do
       post :sync
       get :sparkline
       patch :toggle_active
+      patch :set_default
+      patch :remove_default
       get :select_provider
       get :confirm_unlink
       delete :unlink
diff --git a/db/migrate/20260305120000_add_default_account_to_users.rb b/db/migrate/20260305120000_add_default_account_to_users.rb
new file mode 100644
index 000000000..9bb6d0619
--- /dev/null
+++ b/db/migrate/20260305120000_add_default_account_to_users.rb
@@ -0,0 +1,5 @@
+class AddDefaultAccountToUsers < ActiveRecord::Migration[7.2]
+  def change
+    add_reference :users, :default_account, type: :uuid, foreign_key: { to_table: :accounts, on_delete: :nullify }, null: true
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index ae425569d..08a91cddd 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -1474,6 +1474,8 @@ ActiveRecord::Schema[7.2].define(version: 2026_03_14_131357) do
     t.jsonb "preferences", default: {}, null: false
     t.string "locale"
     t.string "ui_layout"
+    t.uuid "default_account_id"
+    t.index ["default_account_id"], name: "index_users_on_default_account_id"
     t.index ["email"], name: "index_users_on_email", unique: true
     t.index ["family_id"], name: "index_users_on_family_id"
     t.index ["last_viewed_chat_id"], name: "index_users_on_last_viewed_chat_id"
@@ -1584,6 +1586,7 @@ ActiveRecord::Schema[7.2].define(version: 2026_03_14_131357) do
   add_foreign_key "transactions", "merchants"
   add_foreign_key "transfers", "transactions", column: "inflow_transaction_id", on_delete: :cascade
   add_foreign_key "transfers", "transactions", column: "outflow_transaction_id", on_delete: :cascade
+  add_foreign_key "users", "accounts", column: "default_account_id", on_delete: :nullify
   add_foreign_key "users", "chats", column: "last_viewed_chat_id"
   add_foreign_key "users", "families"
 end
diff --git a/test/controllers/accounts_controller_test.rb b/test/controllers/accounts_controller_test.rb
index 39e4dc2e1..0034360e0 100644
--- a/test/controllers/accounts_controller_test.rb
+++ b/test/controllers/accounts_controller_test.rb
@@ -158,7 +158,6 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
 
     assert_response :success
     assert_includes @response.body, @account.name
-    assert_includes @response.body, "account_#{@account.id}_active"
   end
 
   test "toggle_active disables and re-enables an account" do
@@ -178,6 +177,34 @@ class AccountsControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
   end
 
+  test "set_default sets user default account" do
+    patch set_default_account_url(@account)
+    assert_redirected_to accounts_path
+    @user.reload
+    assert_equal @account.id, @user.default_account_id
+  end
+
+  test "set_default rejects ineligible account type" do
+    investment = accounts(:investment)
+
+    patch set_default_account_url(investment)
+    assert_redirected_to accounts_path
+    assert_equal I18n.t("accounts.set_default.depository_only"), flash[:alert]
+
+    @user.reload
+    assert_not_equal investment.id, @user.default_account_id
+  end
+
+  test "remove_default clears user default account" do
+    @user.update!(default_account: @account)
+
+    patch remove_default_account_url(@account)
+    assert_redirected_to accounts_path
+
+    @user.reload
+    assert_nil @user.default_account_id
+  end
+
   test "select_provider redirects for already linked account" do
     plaid_account = plaid_accounts(:one)
     AccountProvider.create!(account: @account, provider: plaid_account)
diff --git a/test/models/user_test.rb b/test/models/user_test.rb
index 0d2a09d58..46aa0637f 100644
--- a/test/models/user_test.rb
+++ b/test/models/user_test.rb
@@ -362,6 +362,33 @@ class UserTest < ActiveSupport::TestCase
       "Should return false when section key is missing from collapsed_sections"
   end
 
+  # Default account for transactions
+  test "default_account_for_transactions returns account when active and manual" do
+    account = accounts(:depository)
+    @user.update!(default_account: account)
+    assert_equal account, @user.default_account_for_transactions
+  end
+
+  test "default_account_for_transactions returns nil when account is disabled" do
+    account = accounts(:depository)
+    @user.update!(default_account: account)
+    account.disable!
+    assert_nil @user.default_account_for_transactions
+  end
+
+  test "default_account_for_transactions returns nil when account is linked" do
+    account = accounts(:depository)
+    @user.update!(default_account: account)
+    plaid_account = plaid_accounts(:one)
+    AccountProvider.create!(account: account, provider: plaid_account)
+    account.reload
+    assert_nil @user.default_account_for_transactions
+  end
+
+  test "default_account_for_transactions returns nil when no default set" do
+    assert_nil @user.default_account_for_transactions
+  end
+
   # SSO-only user security tests
   test "sso_only? returns true for user with OIDC identity and no password" do
     sso_user = users(:sso_only)