diff --git a/app/models/form_handler.rb b/app/models/form_handler.rb
index 360ad9899..7f858c645 100644
--- a/app/models/form_handler.rb
+++ b/app/models/form_handler.rb
@@ -122,6 +122,11 @@ class FormHandler
     forms.count { |form| now.between?(form.start_date, form.new_logs_end_date) } > 1
   end
 
+  def sales_in_edit_crossover_period?(now: Time.zone.now)
+    forms = sales_forms.values
+    forms.count { |form| now.between?(form.start_date, form.edit_end_date) } > 1
+  end
+
   def use_fake_forms!(fake_forms = nil)
     @directories = ["spec/fixtures/forms"]
     @forms = fake_forms || get_all_forms
diff --git a/app/models/validations/sales/setup_validations.rb b/app/models/validations/sales/setup_validations.rb
index 1618ac3d9..661b5b058 100644
--- a/app/models/validations/sales/setup_validations.rb
+++ b/app/models/validations/sales/setup_validations.rb
@@ -5,7 +5,13 @@ module Validations::Sales::SetupValidations
   def validate_saledate_collection_year(record)
     return unless record.saledate && date_valid?("saledate", record) && FeatureToggle.saledate_collection_window_validation_enabled?
 
-    unless record.saledate.between?(active_collection_start_date, current_collection_end_date)
+    first_collection_start_date = if record.saledate_was.present?
+                                    editable_collection_start_date
+                                  else
+                                    active_collection_start_date
+                                  end
+
+    unless record.saledate.between?(first_collection_start_date, current_collection_end_date)
       record.errors.add :saledate, saledate_validation_error_message
     end
   end
@@ -28,6 +34,14 @@ private
     end
   end
 
+  def editable_collection_start_date
+    if FormHandler.instance.sales_in_edit_crossover_period?
+      previous_collection_start_date
+    else
+      current_collection_start_date
+    end
+  end
+
   def saledate_validation_error_message
     current_end_year_long = current_collection_end_date.strftime("#{current_collection_end_date.day.ordinalize} %B %Y")
 
diff --git a/spec/models/validations/sales/setup_validations_spec.rb b/spec/models/validations/sales/setup_validations_spec.rb
index 6f70e3f1e..e0bad66ae 100644
--- a/spec/models/validations/sales/setup_validations_spec.rb
+++ b/spec/models/validations/sales/setup_validations_spec.rb
@@ -105,6 +105,52 @@ RSpec.describe Validations::Sales::SetupValidations do
           expect(record.errors[:saledate]).to include("Enter a date within the 23/24 or 24/25 collection years, which is between 1st April 2023 and 31st March 2025")
         end
       end
+
+      context "when after the new logs end date but before edit end date for the previous period" do
+        let(:record) { build(:sales_log, saledate: Time.zone.local(2025, 4, 1)) }
+
+        before do
+          allow(Time).to receive(:now).and_return(Time.zone.local(2024, 8, 8))
+        end
+
+        it "cannot create new logs for the previous collection year" do
+          record.update!(saledate: nil)
+          record.saledate = Time.zone.local(2024, 1, 1)
+          setup_validator.validate_saledate_collection_year(record)
+          expect(record.errors["saledate"]).to include(match "Enter a date within the 24/25 collection year, which is between 1st April 2024 and 31st March 2025")
+        end
+
+        it "can edit already created logs logs for the previous collection year" do
+          record.saledate = Time.zone.local(2024, 1, 2)
+          record.save!(validate: false)
+          record.saledate = Time.zone.local(2024, 1, 1)
+          setup_validator.validate_saledate_collection_year(record)
+          expect(record.errors["saledate"]).not_to include(match "Enter a date within the 24/25 collection year, which is between 1st April 2024 and 31st March 2025")
+        end
+      end
+
+      context "when after the new logs end date and after the edit end date for the previous period" do
+        let(:record) { build(:sales_log, saledate: Time.zone.local(2025, 4, 1)) }
+
+        before do
+          allow(Time).to receive(:now).and_return(Time.zone.local(2024, 12, 8))
+        end
+
+        it "cannot create new logs for the previous collection year" do
+          record.update!(saledate: nil)
+          record.saledate = Time.zone.local(2024, 1, 1)
+          setup_validator.validate_saledate_collection_year(record)
+          expect(record.errors["saledate"]).to include(match "Enter a date within the 24/25 collection year, which is between 1st April 2024 and 31st March 2025")
+        end
+
+        it "cannot edit already created logs logs for the previous collection year" do
+          record.saledate = Time.zone.local(2024, 1, 2)
+          record.save!(validate: false)
+          record.saledate = Time.zone.local(2024, 1, 1)
+          setup_validator.validate_saledate_collection_year(record)
+          expect(record.errors["saledate"]).to include(match "Enter a date within the 24/25 collection year, which is between 1st April 2024 and 31st March 2025")
+        end
+      end
     end
   end