diff --git a/app/services/form_submission_service.rb b/app/services/form_submission_service.rb
index 24fda7bb5..94f7252fd 100644
--- a/app/services/form_submission_service.rb
+++ b/app/services/form_submission_service.rb
@@ -53,9 +53,17 @@ def fetch_english_language_form
 
     raise ActiveResource::ResourceNotFound.new(404, "Not Found") if english_form_document.nil?
 
+    @welsh_form = form if form.welsh?
     @form = Form.new(english_form_document)
   end
 
+  def welsh_form_document
+    return unless submission_locale == :cy
+    return @welsh_form.document_json if @welsh_form.present?
+
+    Api::V2::FormDocumentRepository.find_with_mode(form_id: form.id, mode:, language: :cy)
+  end
+
   def validate_submission
     raise StandardError, "Form id(#{form.id}) has no completed steps i.e questions/answers to submit" if current_context.completed_steps.blank?
   end
@@ -89,6 +97,7 @@ def create_submission_record
       answers: current_context.answers,
       mode: mode,
       form_document: form.document_json,
+      welsh_form_document: welsh_form_document,
       submission_locale:,
       created_at: timestamp,
     )
diff --git a/db/migrate/20260520093250_add_welsh_form_document_to_submissions.rb b/db/migrate/20260520093250_add_welsh_form_document_to_submissions.rb
new file mode 100644
index 000000000..aaffdaf79
--- /dev/null
+++ b/db/migrate/20260520093250_add_welsh_form_document_to_submissions.rb
@@ -0,0 +1,5 @@
+class AddWelshFormDocumentToSubmissions < ActiveRecord::Migration[8.1]
+  def change
+    add_column :submissions, :welsh_form_document, :jsonb
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index ce96ed055..fa90a1f56 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.1].define(version: 2026_05_06_142828) do
+ActiveRecord::Schema[8.1].define(version: 2026_05_20_093250) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
 
@@ -46,6 +46,7 @@
     t.string "reference"
     t.string "submission_locale", default: "en", null: false, comment: "The language the form was submitted in ISO 2 letter format. Normally either 'en' or 'cy'"
     t.datetime "updated_at", null: false
+    t.jsonb "welsh_form_document"
     t.index ["created_at", "form_id", "mode"], name: "index_submissions_on_created_at_and_form_id_and_mode"
   end
 
diff --git a/spec/services/form_submission_service_spec.rb b/spec/services/form_submission_service_spec.rb
index c61c1878b..45f5de9ea 100644
--- a/spec/services/form_submission_service_spec.rb
+++ b/spec/services/form_submission_service_spec.rb
@@ -190,8 +190,12 @@
           }.to change(Submission, :count).by(1)
                                          .and change(Delivery, :count).by(1)
 
-          expect(Submission.last).to have_attributes(reference:, form_id: form.id, answers: answers.deep_stringify_keys,
-                                                     mode: "form", form_document: document_json,
+          expect(Submission.last).to have_attributes(reference:,
+                                                     form_id: form.id,
+                                                     answers: answers.deep_stringify_keys,
+                                                     mode: "form",
+                                                     form_document: document_json,
+                                                     welsh_form_document: nil,
                                                      submission_locale: "en")
         end
 
@@ -283,6 +287,32 @@
         end
       end
 
+      context "when Welsh has been used to complete the form" do
+        let(:locales_used) { %i[en cy] }
+
+        before do
+          ActiveResource::HttpMock.respond_to do |mock|
+            mock.get "/api/v2/forms/1/live?language=cy", {}, welsh_form_document.to_json, 200
+          end
+        end
+
+        it "fetches the Welsh form" do
+          service.submit
+          expect(ActiveResource::HttpMock.requests).to include ActiveResource::Request.new(:get, "/api/v2/forms/1/live?language=cy")
+        end
+
+        it "saves the submission data including the Welsh version of the form" do
+          expect {
+            service.submit
+          }.to change(Submission, :count).by(1)
+
+          expect(Submission.last.form_document["language"]).to eq("en")
+          expect(Submission.last.form_document["name"]).to eq("Form 1")
+          expect(Submission.last.welsh_form_document["language"]).to eq("cy")
+          expect(Submission.last.welsh_form_document["name"]).to eq("Welsh Form 1")
+        end
+      end
+
       context "when form is not in english" do
         let(:submission_type) { "email" }
         let(:submission_format) { [] }
@@ -305,10 +335,22 @@
             service.submit
           }.to change(Submission, :count).by(1)
 
-          # expect(Submission.last).to have_attributes(form_id: form.id, answers: answers.deep_stringify_keys, form_document: document_json)
           expect(Submission.last.form_document["language"]).to eq("en")
           expect(Submission.last.form_document["name"]).to eq("Form 1")
         end
+
+        context "when Welsh has been used to complete the form" do
+          let(:locales_used) { %i[en cy] }
+
+          it "saves the original Welsh version of the form on the submission" do
+            expect {
+              service.submit
+            }.to change(Submission, :count).by(1)
+
+            expect(Submission.last.welsh_form_document["language"]).to eq("cy")
+            expect(Submission.last.welsh_form_document["name"]).to eq("Welsh Form 1")
+          end
+        end
       end
     end