diff --git a/lib/tasks/blank_migrated_soctenant_values.rake b/lib/tasks/blank_migrated_soctenant_values.rake
new file mode 100644
index 000000000..f58b0ad39
--- /dev/null
+++ b/lib/tasks/blank_migrated_soctenant_values.rake
@@ -0,0 +1,4 @@
+desc "Alter soctenant values for sales logs in the database if the subsequent questions are blank or inferred as don't know"
+task blank_migrated_soctenant_values: :environment do
+  SalesLog.imported.filter_by_year(2023).where(frombeds: nil, fromprop: 0, socprevten: 10, soctenant: 0).update_all(soctenant: nil, fromprop: nil, socprevten: nil, values_updated_at: Time.zone.now)
+end
diff --git a/spec/lib/tasks/blank_migrated_soctenant_values_spec.rb b/spec/lib/tasks/blank_migrated_soctenant_values_spec.rb
new file mode 100644
index 000000000..ddc5ca8e9
--- /dev/null
+++ b/spec/lib/tasks/blank_migrated_soctenant_values_spec.rb
@@ -0,0 +1,67 @@
+require "rails_helper"
+require "rake"
+
+RSpec.describe "blank_migrated_soctenant_values" do
+  describe ":blank_migrated_soctenant_values", type: :task do
+    subject(:task) { Rake::Task["blank_migrated_soctenant_values"] }
+
+    before do
+      Rake.application.rake_require("tasks/blank_migrated_soctenant_values")
+      Rake::Task.define_task(:environment)
+      task.reenable
+    end
+
+    context "when the rake task is run" do
+      let!(:sales_log) { create(:sales_log, :completed, :shared_ownership, values_updated_at: nil) }
+
+      it "blanks soctenant (and subsequent questions) values from relevant migrated logs" do
+        sales_log.old_id = "404"
+        sales_log.frombeds = nil
+        sales_log.fromprop = 0 # don't know
+        sales_log.socprevten = 10 # don't know
+        sales_log.soctenant = 0 # don't know
+        sales_log.save!
+        task.invoke
+        sales_log.reload
+        expect(sales_log.soctenant).to eq(nil)
+        expect(sales_log.frombeds).to eq(nil)
+        expect(sales_log.fromprop).to eq(nil)
+        expect(sales_log.socprevten).to eq(nil)
+        expect(sales_log.values_updated_at).not_to be_nil
+      end
+
+      it "does not blank soctenant (and subsequent questions) values from 2022 logs" do
+        sales_log.old_id = "404"
+        sales_log.frombeds = nil
+        sales_log.fromprop = 0 # don't know
+        sales_log.socprevten = 10 # don't know
+        sales_log.soctenant = 0 # don't know
+        sales_log.saledate = Time.zone.local(2022, 5, 5)
+        sales_log.save!
+        task.invoke
+        sales_log.reload
+        expect(sales_log.soctenant).to eq(0)
+        expect(sales_log.frombeds).to eq(nil)
+        expect(sales_log.fromprop).to eq(0)
+        expect(sales_log.socprevten).to eq(10)
+        expect(sales_log.values_updated_at).to be_nil
+      end
+
+      it "does not blank soctenant (and subsequent questions) values from non imported logs" do
+        sales_log.old_id = nil
+        sales_log.frombeds = nil
+        sales_log.fromprop = 0 # don't know
+        sales_log.socprevten = 10 # don't know
+        sales_log.soctenant = 0 # don't know
+        sales_log.save!
+        task.invoke
+        sales_log.reload
+        expect(sales_log.soctenant).to eq(0)
+        expect(sales_log.frombeds).to eq(nil)
+        expect(sales_log.fromprop).to eq(0)
+        expect(sales_log.socprevten).to eq(10)
+        expect(sales_log.values_updated_at).to be_nil
+      end
+    end
+  end
+end