diff --git a/app/helpers/collection_time_helper.rb b/app/helpers/collection_time_helper.rb
index c9bba317e..23014b8d1 100644
--- a/app/helpers/collection_time_helper.rb
+++ b/app/helpers/collection_time_helper.rb
@@ -24,8 +24,8 @@ module CollectionTimeHelper
     Time.zone.local(current_collection_start_year + 1, 3, 31)
   end
 
-  def next_collection_end_date
-    current_collection_end_date + 1.year
+  def previous_collection_end_date
+    current_collection_end_date - 1.year
   end
 
   def next_collection_start_year
@@ -35,4 +35,8 @@ module CollectionTimeHelper
   def previous_collection_start_year
     current_collection_start_year - 1
   end
+
+  def previous_collection_start_date
+    current_collection_start_date - 1.year
+  end
 end
diff --git a/app/models/validations/sales/setup_validations.rb b/app/models/validations/sales/setup_validations.rb
index 5c2973487..e7090aabf 100644
--- a/app/models/validations/sales/setup_validations.rb
+++ b/app/models/validations/sales/setup_validations.rb
@@ -5,39 +5,40 @@ module Validations::Sales::SetupValidations
   def validate_saledate(record)
     return unless record.saledate && date_valid?("saledate", record)
 
-    unless record.saledate.between?(current_collection_start_date, active_collection_end_date)
+    unless record.saledate.between?(active_collection_start_date, current_collection_end_date) || !FeatureToggle.saledate_collection_window_validation_enabled?
       record.errors.add :saledate, validation_error_message
     end
   end
 
 private
 
-  def active_collection_end_date
-    if FeatureToggle.saledate_next_collection_year_validation_enabled?
-      next_collection_end_date
+  def active_collection_start_date
+    if FormHandler.instance.sales_in_crossover_period?
+      previous_collection_start_date
     else
-      current_collection_end_date
+      current_collection_start_date
     end
   end
 
   def validation_error_message
-    start_date = current_collection_start_date
-    if FeatureToggle.saledate_next_collection_year_validation_enabled?
+    current_end_year_long = current_collection_end_date.strftime("#{current_collection_end_date.day.ordinalize} %B %Y")
+
+    if FormHandler.instance.sales_in_crossover_period?
       I18n.t(
-        "validations.setup.saledate.current_and_next_financial_year",
-        current_start_year_short: start_date.strftime("%y"),
+        "validations.setup.saledate.previous_and_current_financial_year",
+        previous_start_year_short: previous_collection_start_date.strftime("%y"),
+        previous_end_year_short: previous_collection_end_date.strftime("%y"),
+        previous_start_year_long: previous_collection_start_date.strftime("#{previous_collection_start_date.day.ordinalize} %B %Y"),
         current_end_year_short: current_collection_end_date.strftime("%y"),
-        current_start_year_long: start_date.strftime("%Y"),
-        next_end_year_short: next_collection_end_date.strftime("%y"),
-        next_end_year_long: next_collection_end_date.strftime("%Y"),
+        current_end_year_long:,
       )
     else
       I18n.t(
         "validations.setup.saledate.current_financial_year",
-        current_start_year_short: start_date.strftime("%y"),
+        current_start_year_short: current_collection_start_date.strftime("%y"),
         current_end_year_short: current_collection_end_date.strftime("%y"),
-        current_start_year_long: start_date.strftime("%Y"),
-        current_end_year_long: current_collection_end_date.strftime("%Y"),
+        current_start_year_long: current_collection_start_date.strftime("#{current_collection_start_date.day.ordinalize} %B %Y"),
+        current_end_year_long:,
       )
     end
   end
diff --git a/config/initializers/feature_toggle.rb b/config/initializers/feature_toggle.rb
index ff9206d16..dda281e10 100644
--- a/config/initializers/feature_toggle.rb
+++ b/config/initializers/feature_toggle.rb
@@ -1,14 +1,15 @@
 class FeatureToggle
-  def self.startdate_two_week_validation_enabled?
+  # Disable check on preview apps to allow for testing of future forms
+  def self.saledate_collection_window_validation_enabled?
     Rails.env.production? || Rails.env.test? || Rails.env.staging?
   end
 
-  def self.startdate_collection_window_validation_enabled?
+  def self.startdate_two_week_validation_enabled?
     Rails.env.production? || Rails.env.test? || Rails.env.staging?
   end
 
-  def self.saledate_next_collection_year_validation_enabled?
-    !Rails.env.production?
+  def self.startdate_collection_window_validation_enabled?
+    Rails.env.production? || Rails.env.test? || Rails.env.staging?
   end
 
   def self.sales_log_enabled?
diff --git a/config/locales/en.yml b/config/locales/en.yml
index ae4c7071f..1ce8aeb2d 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -151,9 +151,9 @@ en:
         blank: "Enter name of other intermediate rent product"
       saledate:
         current_financial_year:
-          Enter a date within the %{current_start_year_short}/%{current_end_year_short} financial year, which is between 1st April %{current_start_year_long} and 31st March %{current_end_year_long}
-        current_and_next_financial_year:
-          "Enter a date within the %{current_start_year_short}/%{current_end_year_short} or %{current_end_year_short}/%{next_end_year_short} financial years, which is between 1st April %{current_start_year_long} and 31st March %{next_end_year_long}"
+          Enter a date within the %{current_start_year_short}/%{current_end_year_short} financial year, which is between %{current_start_year_long} and %{current_end_year_long}
+        previous_and_current_financial_year:
+          "Enter a date within the %{previous_start_year_short}/%{previous_end_year_short} or %{previous_end_year_short}/%{current_end_year_short} financial years, which is between %{previous_start_year_long} and %{current_end_year_long}"
 
       startdate:
         later_than_14_days_after: "The tenancy start date must not be later than 14 days from today’s date"
diff --git a/spec/helpers/tasklist_helper_spec.rb b/spec/helpers/tasklist_helper_spec.rb
index 3b3974966..b5bfe89f5 100644
--- a/spec/helpers/tasklist_helper_spec.rb
+++ b/spec/helpers/tasklist_helper_spec.rb
@@ -14,7 +14,7 @@ RSpec.describe TasklistHelper do
 
   describe "with lettings" do
     let(:empty_lettings_log) { create(:lettings_log) }
-    let(:lettings_log) { create(:lettings_log, :in_progress, needstype: 1) }
+    let(:lettings_log) { build(:lettings_log, :in_progress, needstype: 1) }
 
     describe "get next incomplete section" do
       it "returns the first subsection name if it is not completed" do
@@ -41,7 +41,7 @@ RSpec.describe TasklistHelper do
       end
 
       it "returns the number of sections in progress" do
-        expect(get_subsections_count(lettings_log, :in_progress)).to eq(3)
+        expect(get_subsections_count(lettings_log, :in_progress)).to eq(2)
       end
 
       it "returns 0 for invalid state" do
@@ -85,6 +85,7 @@ RSpec.describe TasklistHelper do
     end
 
     describe "subsection link" do
+      let(:lettings_log) { create(:lettings_log, :completed) }
       let(:subsection) { lettings_log.form.get_subsection("household_characteristics") }
       let(:user) { build(:user) }
 
diff --git a/spec/models/validations/sales/setup_validations_spec.rb b/spec/models/validations/sales/setup_validations_spec.rb
index df559a911..4571ae5cd 100644
--- a/spec/models/validations/sales/setup_validations_spec.rb
+++ b/spec/models/validations/sales/setup_validations_spec.rb
@@ -6,11 +6,7 @@ RSpec.describe Validations::Sales::SetupValidations do
   let(:validator_class) { Class.new { include Validations::Sales::SetupValidations } }
 
   describe "#validate_saledate" do
-    context "with saledate_next_collection_year_validation_enabled == true" do
-      before do
-        allow(FeatureToggle).to receive(:saledate_next_collection_year_validation_enabled?).and_return(true)
-      end
-
+    context "with sales_in_crossover_period == false" do
       context "when saledate is blank" do
         let(:record) { build(:sales_log, saledate: nil) }
 
@@ -37,7 +33,7 @@ RSpec.describe Validations::Sales::SetupValidations do
         it "adds error" do
           setup_validator.validate_saledate(record)
 
-          expect(record.errors[:saledate]).to include("Enter a date within the 22/23 or 23/24 financial years, which is between 1st April 2022 and 31st March 2024")
+          expect(record.errors[:saledate]).to include("Enter a date within the 22/23 financial year, which is between 1st April 2022 and 31st March 2023")
         end
       end
 
@@ -47,14 +43,19 @@ RSpec.describe Validations::Sales::SetupValidations do
         it "adds error" do
           setup_validator.validate_saledate(record)
 
-          expect(record.errors[:saledate]).to include("Enter a date within the 22/23 or 23/24 financial years, which is between 1st April 2022 and 31st March 2024")
+          expect(record.errors[:saledate]).to include("Enter a date within the 22/23 financial year, which is between 1st April 2022 and 31st March 2023")
         end
       end
     end
 
-    context "with saledate_next_collection_year_validation_enabled == false" do
-      before do
-        allow(FeatureToggle).to receive(:saledate_next_collection_year_validation_enabled?).and_return(false)
+    context "with sales_in_crossover_period == true" do
+      around do |example|
+        Timecop.freeze(Time.zone.local(2024, 5, 1)) do
+          Singleton.__init__(FormHandler)
+          example.run
+        end
+        Timecop.return
+        Singleton.__init__(FormHandler)
       end
 
       context "when saledate is blank" do
@@ -68,7 +69,7 @@ RSpec.describe Validations::Sales::SetupValidations do
       end
 
       context "when saledate is in the 22/23 financial year" do
-        let(:record) { build(:sales_log, saledate: Time.zone.local(2023, 1, 1)) }
+        let(:record) { build(:sales_log, saledate: Time.zone.local(2024, 1, 1)) }
 
         it "does not add an error" do
           setup_validator.validate_saledate(record)
@@ -78,12 +79,12 @@ RSpec.describe Validations::Sales::SetupValidations do
       end
 
       context "when saledate is before the 22/23 financial year" do
-        let(:record) { build(:sales_log, saledate: Time.zone.local(2020, 1, 1)) }
+        let(:record) { build(:sales_log, saledate: Time.zone.local(2020, 5, 1)) }
 
         it "adds error" do
           setup_validator.validate_saledate(record)
 
-          expect(record.errors[:saledate]).to include("Enter a date within the 22/23 financial year, which is between 1st April 2022 and 31st March 2023")
+          expect(record.errors[:saledate]).to include("Enter a date within the 23/24 or 24/25 financial years, which is between 1st April 2023 and 31st March 2025")
         end
       end
 
@@ -93,7 +94,7 @@ RSpec.describe Validations::Sales::SetupValidations do
         it "adds error" do
           setup_validator.validate_saledate(record)
 
-          expect(record.errors[:saledate]).to include("Enter a date within the 22/23 financial year, which is between 1st April 2022 and 31st March 2023")
+          expect(record.errors[:saledate]).to include("Enter a date within the 23/24 or 24/25 financial years, which is between 1st April 2023 and 31st March 2025")
         end
       end
     end