diff --git a/app/components/data_sharing_agreement_banner_component.html.erb b/app/components/data_sharing_agreement_banner_component.html.erb
index 40128d590..849b04843 100644
--- a/app/components/data_sharing_agreement_banner_component.html.erb
+++ b/app/components/data_sharing_agreement_banner_component.html.erb
@@ -1,7 +1,7 @@
 <% if display_banner? %>
   <%= govuk_notification_banner(title_text: "Important") do %>
     <p class="govuk-notification-banner__heading govuk-!-width-full" style="max-width: fit-content">
-      Your organisation must accept the Data Sharing Agreement before you can create any logs.
+      <%= I18n.t("validations.organisation.data_sharing_agreement_not_signed") %>
     <p>
     <%= govuk_link_to(
       "Read the Data Sharing Agreement",
diff --git a/app/models/log.rb b/app/models/log.rb
index 09c760934..3e37489b3 100644
--- a/app/models/log.rb
+++ b/app/models/log.rb
@@ -9,6 +9,7 @@ class Log < ApplicationRecord
   belongs_to :bulk_upload, optional: true
 
   before_save :update_status!
+  before_validation :verify_dsa_signed, on: :create
 
   STATUS = {
     "not_started" => 0,
@@ -177,6 +178,13 @@ class Log < ApplicationRecord
 
 private
 
+  def verify_dsa_signed
+    return unless owning_organisation
+    return if owning_organisation.data_sharing_agreement.present?
+
+    errors.add :owning_organisation, I18n.t("validations.organisation.data_sharing_agreement_not_signed")
+  end
+
   # Handle logs that are older than previous collection start date
   def older_than_previous_collection_year?
     return false unless startdate
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 6cba97954..f5d8a56b7 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -105,7 +105,6 @@ en:
             confirm_soft_errors:
               blank: You must select if there are errors in these fields
 
-
   activerecord:
     attributes:
       user:
@@ -178,6 +177,7 @@ en:
 
   validations:
     organisation:
+      data_sharing_agreement_not_signed: Your organisation must accept the Data Sharing Agreement before you can create any logs.
       name_missing: "Enter the name of the organisation"
       provider_type_missing: "Select the organisation type"
       stock_owner:
diff --git a/spec/shared/shared_log_examples.rb b/spec/shared/shared_log_examples.rb
index f9cc59633..ed5810b34 100644
--- a/spec/shared/shared_log_examples.rb
+++ b/spec/shared/shared_log_examples.rb
@@ -104,5 +104,26 @@ RSpec.shared_examples "shared log examples" do |log_type|
       end
     end
   end
+
+  describe "#verify_dsa_signed" do
+    it "is valid if the DSA is signed" do
+      log = build(log_type, :in_progress, owning_organisation: create(:organisation))
+
+      expect(log).to be_valid
+    end
+
+    it "is not valid if the DSA is not signed" do
+      log = build(log_type, owning_organisation: create(:organisation, :without_dsa))
+
+      expect(log).not_to be_valid
+      expect(log.errors[:owning_organisation]).to eq(["Your organisation must accept the Data Sharing Agreement before you can create any logs."])
+    end
+
+    it "is valid when owning_organisation nil" do
+      log = build(log_type, owning_organisation: nil)
+
+      expect(log).to be_valid
+    end
+  end
 end
 # rubocop:enable RSpec/AnyInstance