diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index b834f54b..abccf57d 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -154,4 +154,8 @@ module ApplicationHelper
               .map { |_currency, money| format_money(money) }
               .join(separator)
   end
+
+  def invite_code_required?
+    ENV["REQUIRE_INVITE_CODE"] == "true"
+  end
 end
diff --git a/app/views/layouts/auth.html.erb b/app/views/layouts/auth.html.erb
index 05c81e68..8c492be1 100644
--- a/app/views/layouts/auth.html.erb
+++ b/app/views/layouts/auth.html.erb
@@ -8,9 +8,11 @@
       </h2>
 
       <% if controller_name == "sessions" %>
-        <p class="mt-2 text-sm text-center text-gray-600">
-          <%= t(".or") %> <%= link_to t(".sign_up"), new_registration_path, class: "font-medium text-gray-600 hover:text-gray-400 transition" %>
-        </p>
+        <% unless invite_code_required? %>
+          <p class="mt-2 text-sm text-center text-gray-600">
+            <%= t(".or") %> <%= link_to t(".sign_up"), new_registration_path, class: "font-medium text-gray-600 hover:text-gray-400 transition" %>
+          </p>
+        <% end %>
       <% elsif controller_name == "registrations" %>
         <p class="mt-2 text-sm text-center text-gray-600">
           <%= t(".or") %> <%= link_to t(".sign_in"), new_session_path, class: "font-medium text-gray-600 hover:text-gray-400 transition" %>