diff --git a/app/models/user.rb b/app/models/user.rb
index 126c7adec..62176d692 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -92,6 +92,10 @@ class User < ApplicationRecord
     "User:#{id}"
   end
 
+  def active?
+    last_sign_in_at.present?
+  end
+
   private
 
   def link_invites!
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 4ff839507..a24949fbc 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -191,4 +191,22 @@ describe User, type: :model do
       it { expect(AdministrationMailer).to have_received(:invite_admin).with(user, nil, administration.id) }
     end
   end
+
+  describe '#active?' do
+    let!(:user) { create(:user) }
+
+    subject { user.active? }
+
+    context 'when the user has never signed in' do
+      before { user.update(last_sign_in_at: nil) }
+
+      it { is_expected.to be false }
+    end
+
+    context 'when the user has already signed in' do
+      before { user.update(last_sign_in_at: Time.zone.now) }
+
+      it { is_expected.to be true }
+    end
+  end
 end