diff --git a/api/app/models/new_club_application.rb b/api/app/models/new_club_application.rb
index a14450f7c..588d4fca6 100644
--- a/api/app/models/new_club_application.rb
+++ b/api/app/models/new_club_application.rb
@@ -77,6 +77,11 @@ class NewClubApplication < ApplicationRecord
             }
 
   def submit!
+    if submitted?
+      errors.add(:base, 'already submitted')
+      return false
+    end
+
     self.submitted_at = Time.current
 
     if valid?
diff --git a/api/spec/models/new_club_application_spec.rb b/api/spec/models/new_club_application_spec.rb
index 621598873..df06b1772 100644
--- a/api/spec/models/new_club_application_spec.rb
+++ b/api/spec/models/new_club_application_spec.rb
@@ -215,6 +215,15 @@
       )
     end
 
+    it 'fails if already submitted' do
+      # submit twice
+      subject.submit!
+      res = subject.submit!
+
+      expect(res).to eq(false)
+      expect(subject.errors[:base]).to include 'already submitted'
+    end
+
     it 'succeeds when required fields are set & leader profiles complete' do
       res = subject.submit!
 
diff --git a/api/spec/requests/v1/new_club_applications_spec.rb b/api/spec/requests/v1/new_club_applications_spec.rb
index 9ec78769d..cca74d18d 100644
--- a/api/spec/requests/v1/new_club_applications_spec.rb
+++ b/api/spec/requests/v1/new_club_applications_spec.rb
@@ -758,6 +758,17 @@
       ).to include('leader profiles not complete')
     end
 
+    it 'fails if already submitted' do
+      post "/v1/new_club_applications/#{application.id}/submit",
+           headers: auth_headers
+      expect(response.status).to eq(200)
+
+      post "/v1/new_club_applications/#{application.id}/submit",
+           headers: auth_headers
+      expect(response.status).to eq(422)
+      expect(json['errors']['base']).to include('already submitted')
+    end
+
     it 'submits successfully when all fields are present' do
       post "/v1/new_club_applications/#{application.id}/submit",
            headers: auth_headers