diff --git a/app/models/sales_log.rb b/app/models/sales_log.rb
index a76460e87..4d6e152a2 100644
--- a/app/models/sales_log.rb
+++ b/app/models/sales_log.rb
@@ -18,6 +18,7 @@ class SalesLog < Log
   include Validations::Sales::SoftValidations
   include Validations::SoftValidations
   include MoneyFormattingHelper
+  include CollectionTimeHelper
 
   self.inheritance_column = :_type_disabled
 
@@ -37,6 +38,8 @@ class SalesLog < Log
   belongs_to :managing_organisation, class_name: "Organisation", optional: true
 
   scope :filter_by_year, ->(year) { where(saledate: Time.zone.local(year.to_i, 4, 1)...Time.zone.local(year.to_i + 1, 4, 1)) }
+  scope :filter_by_year_or_later, ->(year) { where("sales_logs.saledate >= ?", Time.zone.local(year.to_i, 4, 1)) }
+  scope :filter_by_year_or_earlier, ->(year) { where("sales_logs.saledate < ?", Time.zone.local(year.to_i + 1, 4, 1)) }
   scope :filter_by_years_or_nil, lambda { |years, _user = nil|
     first_year = years.shift
     query = filter_by_year(first_year)
@@ -69,12 +72,14 @@ class SalesLog < Log
   }
   scope :age1_answered, -> { where.not(age1: nil).or(where(age1_known: [1, 2])) }
   scope :ecstat1_answered, -> { where.not(ecstat1: nil).or(where("saledate >= ?", Time.zone.local(2025, 4, 1))) }
+  scope :sex1_answered, -> { where.not(sex1: nil).filter_by_year_or_earlier(2025).or(where.not(sexrab1: nil).filter_by_year_or_later(2026)) }
+  scope :address_answered, -> { where.not(postcode_full: nil).where.not(address_line1: nil).or(where.not(uprn: nil)) }
   scope :duplicate_logs, lambda { |log|
     visible.where(log.slice(*DUPLICATE_LOG_ATTRIBUTES))
     .where.not(id: log.id)
     .where.not(saledate: nil)
-    .where.not(sex1: nil)
-    .where.not(postcode_full: nil)
+    .sex1_answered
+    .address_answered
     .ecstat1_answered
     .age1_answered
   }
@@ -84,8 +89,8 @@ class SalesLog < Log
     scope = visible
     .group(*DUPLICATE_LOG_ATTRIBUTES)
     .where.not(saledate: nil)
-    .where.not(sex1: nil)
-    .where.not(postcode_full: nil)
+    .sex1_answered
+    .address_answered
     .age1_answered
     .ecstat1_answered
     .having("COUNT(*) > 1")
@@ -98,7 +103,7 @@ class SalesLog < Log
   }
 
   OPTIONAL_FIELDS = %w[purchid othtype buyers_organisations].freeze
-  DUPLICATE_LOG_ATTRIBUTES = %w[owning_organisation_id purchid saledate age1_known age1 sex1 ecstat1 postcode_full].freeze
+  DUPLICATE_LOG_ATTRIBUTES = %w[owning_organisation_id purchid saledate age1_known age1 sex1 sexrab1 ecstat1 postcode_full uprn address_line1].freeze
 
   def lettings?
     false
@@ -268,6 +273,22 @@ class SalesLog < Log
     value * equity / 100
   end
 
+  def expected_shared_ownership_deposit_value_tolerance
+    return 1 unless value && equity
+
+    # we found that a fixed tolerance was not quite what we wanted here.
+    # CORE wants it so if a user say, has a 66.666% equity they can enter either 66.6% or 66.7% (or 66.5%)
+    # so in 2026 we base our tolerance off of a discount 0.1% higher or lower
+    if form.start_year_2026_or_later?
+      lower_bound = value * ((equity - 0.1) / 100)
+      upper_bound = value * ((equity + 0.1) / 100)
+
+      (upper_bound - lower_bound) / 2
+    else
+      1
+    end
+  end
+
   def stairbought_part_of_value
     return unless value && stairbought
 
@@ -468,6 +489,22 @@ class SalesLog < Log
     value - discount_amount
   end
 
+  def value_with_discount_tolerance
+    return 1 if value.blank? || discount.nil?
+
+    # we found that a simple tolerance was not quite what we wanted here.
+    # CORE wants it so if a user say, has a 66.6% discount then can enter either 66.6% or 66.7%
+    # so in 2026 we base our tolerance off of a discount 0.1% higher or lower
+    if form.start_year_2026_or_later?
+      discount_amount_lower_bound = value * (discount - 0.1) / 100
+      discount_amount_upper_bound = value * (discount + 0.1) / 100
+
+      (discount_amount_upper_bound - discount_amount_lower_bound) / 2
+    else
+      discount ? value * 0.05 / 100 : 1
+    end
+  end
+
   def mortgage_deposit_and_grant_total
     return if deposit.blank?
 
@@ -506,10 +543,12 @@ class SalesLog < Log
     ["owning_organisation_id",
      "saledate",
      "purchid",
+     "address_line1",
+     "postcode_full",
+     "uprn",
      "age1",
-     "sex1",
      "ecstat1",
-     uprn.blank? ? "postcode_full" : "uprn"].compact
+     form.start_year_2026_or_later? ? "sexrab1" : "sex1"].compact
   end
 
   def soctenant_is_inferred?
diff --git a/app/models/validations/sales/sale_information_validations.rb b/app/models/validations/sales/sale_information_validations.rb
index 063c16599..df6b90a4a 100644
--- a/app/models/validations/sales/sale_information_validations.rb
+++ b/app/models/validations/sales/sale_information_validations.rb
@@ -80,10 +80,9 @@ module Validations::Sales::SaleInformationValidations
     return unless record.mortgage || record.mortgageused == 2 || record.mortgageused == 3
     return unless record.discount || record.grant || record.type == 29
 
-    # When a percentage discount is used, a percentage tolerance is needed to account for rounding errors
-    tolerance = record.discount ? record.value * 0.05 / 100 : 1
+    tolerance = record.value_with_discount_tolerance
 
-    if over_tolerance?(record.mortgage_deposit_and_grant_total, record.value_with_discount, tolerance, strict: !record.discount.nil?) && record.discounted_ownership_sale?
+    if over_tolerance?(record.mortgage_deposit_and_grant_total, record.value_with_discount, tolerance, strict: !record.discount.nil? || record.form.start_year_2026_or_later?) && record.discounted_ownership_sale?
       deposit_and_grant_sentence = record.grant.present? ? ", cash deposit (#{record.field_formatted_as_currency('deposit')}), and grant (#{record.field_formatted_as_currency('grant')})" : " and cash deposit (#{record.field_formatted_as_currency('deposit')})"
       discount_sentence = record.discount.present? ? " (#{record.field_formatted_as_currency('value')}) subtracted by the sum of the full purchase price (#{record.field_formatted_as_currency('value')}) multiplied by the percentage discount (#{record.discount}%)" : ""
       %i[mortgageused mortgage value deposit discount grant].each do |field|
@@ -204,10 +203,12 @@ module Validations::Sales::SaleInformationValidations
   def check_non_staircasing_socialhomebuy_mortgage(record)
     return unless record.cashdis
 
+    tolerance = record.expected_shared_ownership_deposit_value_tolerance
+
     if record.mortgage_used?
       return unless record.mortgage
 
-      if over_tolerance?(record.mortgage_deposit_and_discount_total, record.expected_shared_ownership_deposit_value, 1)
+      if over_tolerance?(record.mortgage_deposit_and_discount_total, record.expected_shared_ownership_deposit_value, tolerance, strict: record.form.start_year_2026_or_later?)
         %i[mortgage value deposit cashdis equity].each do |field|
           record.errors.add field, I18n.t("validations.sales.sale_information.#{field}.non_staircasing_mortgage.mortgage_used_socialhomebuy",
                                           mortgage: record.field_formatted_as_currency("mortgage"),
@@ -228,7 +229,7 @@ module Validations::Sales::SaleInformationValidations
                                                                  expected_shared_ownership_deposit_value: record.field_formatted_as_currency("expected_shared_ownership_deposit_value")).html_safe
       end
     elsif record.mortgage_not_used?
-      if over_tolerance?(record.deposit_and_discount_total, record.expected_shared_ownership_deposit_value, 1)
+      if over_tolerance?(record.deposit_and_discount_total, record.expected_shared_ownership_deposit_value, tolerance, strict: record.form.start_year_2026_or_later?)
         %i[mortgageused value deposit cashdis equity].each do |field|
           record.errors.add field, I18n.t("validations.sales.sale_information.#{field}.non_staircasing_mortgage.mortgage_not_used_socialhomebuy",
                                           deposit_and_discount_total: record.field_formatted_as_currency("deposit_and_discount_total"),
@@ -250,10 +251,12 @@ module Validations::Sales::SaleInformationValidations
   end
 
   def check_non_staircasing_non_socialhomebuy_mortgage(record)
+    tolerance = record.expected_shared_ownership_deposit_value_tolerance
+
     if record.mortgage_used?
       return unless record.mortgage
 
-      if over_tolerance?(record.mortgage_and_deposit_total, record.expected_shared_ownership_deposit_value, 1)
+      if over_tolerance?(record.mortgage_and_deposit_total, record.expected_shared_ownership_deposit_value, tolerance, strict: record.form.start_year_2026_or_later?)
         %i[mortgage value deposit equity].each do |field|
           record.errors.add field, I18n.t("validations.sales.sale_information.#{field}.non_staircasing_mortgage.mortgage_used",
                                           mortgage: record.field_formatted_as_currency("mortgage"),
@@ -272,7 +275,7 @@ module Validations::Sales::SaleInformationValidations
                                                                  expected_shared_ownership_deposit_value: record.field_formatted_as_currency("expected_shared_ownership_deposit_value")).html_safe
       end
     elsif record.mortgage_not_used?
-      if over_tolerance?(record.deposit, record.expected_shared_ownership_deposit_value, 1)
+      if over_tolerance?(record.deposit, record.expected_shared_ownership_deposit_value, tolerance, strict: record.form.start_year_2026_or_later?)
         %i[mortgageused value deposit equity].each do |field|
           record.errors.add field, I18n.t("validations.sales.sale_information.#{field}.non_staircasing_mortgage.mortgage_not_used",
                                           deposit: record.field_formatted_as_currency("deposit"),
diff --git a/app/models/validations/sales/soft_validations.rb b/app/models/validations/sales/soft_validations.rb
index 3569c379f..ce7a812d2 100644
--- a/app/models/validations/sales/soft_validations.rb
+++ b/app/models/validations/sales/soft_validations.rb
@@ -117,6 +117,7 @@ module Validations::Sales::SoftValidations
 
   def mortgage_plus_deposit_less_than_discounted_value?
     return unless mortgage && deposit && value && discount
+    return if form.start_year_2026_or_later?
 
     discounted_value = value * (100 - discount) / 100
     mortgage + deposit < discounted_value
diff --git a/app/services/bulk_upload/sales/year2025/row_parser.rb b/app/services/bulk_upload/sales/year2025/row_parser.rb
index 19ad2cb1b..6f5e2470e 100644
--- a/app/services/bulk_upload/sales/year2025/row_parser.rb
+++ b/app/services/bulk_upload/sales/year2025/row_parser.rb
@@ -533,6 +533,8 @@ class BulkUpload::Sales::Year2025::RowParser
       "field_2",  # saledate
       "field_3",  # saledate
       "field_7",  # purchaser_code
+      "field_16", # uprn
+      "field_17", # address_line1
       "field_21", # postcode
       "field_22", # postcode
       "field_28", # age1
@@ -1287,6 +1289,8 @@ private
       ecstat1
       owning_organisation
       postcode_full
+      uprn
+      address_line1
       purchid
     ]
   end
@@ -1457,6 +1461,8 @@ private
       errors.add(:field_1, error_message) # Sale completion date
       errors.add(:field_2, error_message) # Sale completion date
       errors.add(:field_3, error_message) # Sale completion date
+      errors.add(:field_16, error_message) # UPRN
+      errors.add(:field_17, error_message) # Address line 1
       errors.add(:field_21, error_message) # Postcode
       errors.add(:field_22, error_message) # Postcode
       errors.add(:field_28, error_message) # Buyer 1 age
diff --git a/app/services/bulk_upload/sales/year2026/row_parser.rb b/app/services/bulk_upload/sales/year2026/row_parser.rb
index 94f1a9ae6..873860cb0 100644
--- a/app/services/bulk_upload/sales/year2026/row_parser.rb
+++ b/app/services/bulk_upload/sales/year2026/row_parser.rb
@@ -586,6 +586,8 @@ class BulkUpload::Sales::Year2026::RowParser
       "field_2",  # saledate
       "field_3",  # saledate
       "field_7",  # purchaser_code
+      "field_16", # uprn
+      "field_17", # address_line1
       "field_21", # postcode
       "field_22", # postcode
       "field_28", # age1
@@ -1390,6 +1392,8 @@ private
       ecstat1
       owning_organisation
       postcode_full
+      uprn
+      address_line1
       purchid
     ]
   end
@@ -1560,6 +1564,8 @@ private
       errors.add(:field_1, error_message) # Sale completion date
       errors.add(:field_2, error_message) # Sale completion date
       errors.add(:field_3, error_message) # Sale completion date
+      errors.add(:field_16, error_message) # UPRN
+      errors.add(:field_17, error_message) # Address line 1
       errors.add(:field_21, error_message) # Postcode
       errors.add(:field_22, error_message) # Postcode
       errors.add(:field_28, error_message) # Buyer 1 age
diff --git a/spec/factories/sales_log.rb b/spec/factories/sales_log.rb
index 51bca33b8..ddc47bb53 100644
--- a/spec/factories/sales_log.rb
+++ b/spec/factories/sales_log.rb
@@ -67,6 +67,7 @@ FactoryBot.define do
       sexrab1 { "F" }
       sex1 { "F" }
       ecstat1 { 1 }
+      address_line1 { "same address line 1" }
       postcode_full { "A1 1AA" }
       noint { 2 }
       uprn_known { 0 }
diff --git a/spec/features/sales_log_spec.rb b/spec/features/sales_log_spec.rb
index 97e6549d0..d576e7601 100644
--- a/spec/features/sales_log_spec.rb
+++ b/spec/features/sales_log_spec.rb
@@ -352,16 +352,6 @@ RSpec.describe "Sales Log Features" do
   end
 
   context "when a log becomes a duplicate" do
-    before do
-      Timecop.freeze(Time.zone.local(2024, 3, 3))
-      Singleton.__init__(FormHandler)
-    end
-
-    after do
-      Timecop.return
-      Singleton.__init__(FormHandler)
-    end
-
     context "and updating duplicate log" do
       let(:user) { create(:user, :data_coordinator) }
       let(:sales_log) { create(:sales_log, :duplicate, assigned_to: user) }
diff --git a/spec/models/validations/sales/sale_information_validations_spec.rb b/spec/models/validations/sales/sale_information_validations_spec.rb
index 1731f19ac..1c36ee5e1 100644
--- a/spec/models/validations/sales/sale_information_validations_spec.rb
+++ b/spec/models/validations/sales/sale_information_validations_spec.rb
@@ -663,6 +663,46 @@ RSpec.describe Validations::Sales::SaleInformationValidations do
         expect(record.errors["grant"]).to be_empty
       end
     end
+
+    context "with year 2026", :aggregate_failures do
+      let(:saledate) { Time.zone.local(2026, 4, 1) }
+
+      context "when mortgage and deposit is exact" do
+        let(:record) { FactoryBot.build(:sales_log, saledate:, mortgage: 85_000, deposit: 5_000, value: 100_000, discount: 10, ownershipsch: 2, type: 9) }
+
+        it "does not add an error" do
+          sale_information_validator.validate_discounted_ownership_value(record)
+          expect(record.errors["mortgage"]).to be_empty
+          expect(record.errors["value"]).to be_empty
+          expect(record.errors["deposit"]).to be_empty
+          expect(record.errors["discount"]).to be_empty
+        end
+      end
+
+      context "when mortgage and deposit is within 0.1% discount tolerance" do
+        let(:record) { FactoryBot.build(:sales_log, saledate:, mortgage: 85_000, deposit: 5_000, value: 100_000, discount: 10.1, ownershipsch: 2, type: 9) }
+
+        it "does not add an error" do
+          sale_information_validator.validate_discounted_ownership_value(record)
+          expect(record.errors["mortgage"]).to be_empty
+          expect(record.errors["value"]).to be_empty
+          expect(record.errors["deposit"]).to be_empty
+          expect(record.errors["discount"]).to be_empty
+        end
+      end
+
+      context "when mortgage and deposit is outside 0.1% discount tolerance" do
+        let(:record) { FactoryBot.build(:sales_log, saledate:, mortgage: 85_000, deposit: 5_000, value: 100_000, discount: 10.2, ownershipsch: 2, type: 9) }
+
+        it "adds an error" do
+          sale_information_validator.validate_discounted_ownership_value(record)
+          expect(record.errors["mortgage"]).not_to be_empty
+          expect(record.errors["value"]).not_to be_empty
+          expect(record.errors["deposit"]).not_to be_empty
+          expect(record.errors["discount"]).not_to be_empty
+        end
+      end
+    end
   end
 
   describe "#validate_outright_sale_value_matches_mortgage_plus_deposit" do
@@ -1171,6 +1211,82 @@ RSpec.describe Validations::Sales::SaleInformationValidations do
         end
       end
     end
+
+    context "with year 2026", :aggregate_failures do
+      let(:saledate) { Time.zone.local(2026, 4, 1) }
+
+      context "when mortgage and deposit is exact" do
+        let(:record) { FactoryBot.build(:sales_log, mortgageused: 1, mortgage: 10_000, staircase: 2, deposit: 5_000, value: 100_000, equity: 15, ownershipsch: 1, type: 30, saledate:) }
+
+        it "does not add an error" do
+          sale_information_validator.validate_non_staircasing_mortgage(record)
+          expect(record.errors["mortgage"]).to be_empty
+          expect(record.errors["value"]).to be_empty
+          expect(record.errors["deposit"]).to be_empty
+          expect(record.errors["equity"]).to be_empty
+        end
+      end
+
+      context "when mortgage and deposit is within 0.1% equity tolerance" do
+        let(:record) { FactoryBot.build(:sales_log, mortgageused: 1, mortgage: 10_000, staircase: 2, deposit: 5_000, value: 100_000, equity: 15.1, ownershipsch: 1, type: 30, saledate:) }
+
+        it "does not add an error" do
+          sale_information_validator.validate_non_staircasing_mortgage(record)
+          expect(record.errors["mortgage"]).to be_empty
+          expect(record.errors["value"]).to be_empty
+          expect(record.errors["deposit"]).to be_empty
+          expect(record.errors["equity"]).to be_empty
+        end
+      end
+
+      context "when mortgage and deposit is outside 0.1% equity tolerance" do
+        let(:record) { FactoryBot.build(:sales_log, mortgageused: 1, mortgage: 10_000, staircase: 2, deposit: 5_000, value: 100_000, equity: 15.2, ownershipsch: 1, type: 30, saledate:) }
+
+        it "adds an error" do
+          sale_information_validator.validate_non_staircasing_mortgage(record)
+          expect(record.errors["mortgage"]).not_to be_empty
+          expect(record.errors["value"]).not_to be_empty
+          expect(record.errors["deposit"]).not_to be_empty
+          expect(record.errors["equity"]).not_to be_empty
+        end
+      end
+
+      context "when deposit (no mortgage) is exact" do
+        let(:record) { FactoryBot.build(:sales_log, mortgageused: 2, staircase: 2, deposit: 15_000, value: 100_000, equity: 15, ownershipsch: 1, type: 30, saledate:) }
+
+        it "does not add an error" do
+          sale_information_validator.validate_non_staircasing_mortgage(record)
+          expect(record.errors["mortgageused"]).to be_empty
+          expect(record.errors["value"]).to be_empty
+          expect(record.errors["deposit"]).to be_empty
+          expect(record.errors["equity"]).to be_empty
+        end
+      end
+
+      context "when deposit (no mortgage) is within 0.1% equity tolerance" do
+        let(:record) { FactoryBot.build(:sales_log, mortgageused: 2, staircase: 2, deposit: 15_000, value: 100_000, equity: 15.1, ownershipsch: 1, type: 30, saledate:) }
+
+        it "does not add an error" do
+          sale_information_validator.validate_non_staircasing_mortgage(record)
+          expect(record.errors["mortgageused"]).to be_empty
+          expect(record.errors["value"]).to be_empty
+          expect(record.errors["deposit"]).to be_empty
+          expect(record.errors["equity"]).to be_empty
+        end
+      end
+
+      context "when deposit (no mortgage) is outside 0.1% equity tolerance" do
+        let(:record) { FactoryBot.build(:sales_log, mortgageused: 2, staircase: 2, deposit: 15_000, value: 100_000, equity: 15.2, ownershipsch: 1, type: 30, saledate:) }
+
+        it "adds an error" do
+          sale_information_validator.validate_non_staircasing_mortgage(record)
+          expect(record.errors["mortgageused"]).not_to be_empty
+          expect(record.errors["value"]).not_to be_empty
+          expect(record.errors["deposit"]).not_to be_empty
+          expect(record.errors["equity"]).not_to be_empty
+        end
+      end
+    end
   end
 
   describe "#validate_staircasing_mortgage" do
diff --git a/spec/requests/duplicate_logs_controller_spec.rb b/spec/requests/duplicate_logs_controller_spec.rb
index b254dcb15..69140f1e9 100644
--- a/spec/requests/duplicate_logs_controller_spec.rb
+++ b/spec/requests/duplicate_logs_controller_spec.rb
@@ -170,7 +170,8 @@ RSpec.describe DuplicateLogsController, type: :request do
               expect(page).to have_content("- Buyer 1’s gender identity", count: 3)
               expect(page).to have_content("- Buyer 1’s working situation", count: 3)
               expect(page).to have_content("- Postcode", count: 3)
-              expect(page).to have_link("Change", count: 21)
+              expect(page).to have_content("- Address line 1", count: 3)
+              expect(page).to have_link("Change", count: 24)
               expect(page).to have_link("Change", href: "/sales-logs/#{sales_log.id}/purchaser-code?first_remaining_duplicate_id=#{duplicate_logs[0].id}&organisation_id=#{sales_log.owning_organisation_id}&original_log_id=#{sales_log.id}&referrer=duplicate_logs")
               expect(page).to have_link("Change", href: "/sales-logs/#{duplicate_logs[0].id}/purchaser-code?first_remaining_duplicate_id=#{sales_log.id}&organisation_id=#{sales_log.owning_organisation_id}&original_log_id=#{sales_log.id}&referrer=duplicate_logs")
               expect(page).to have_link("Change", href: "/sales-logs/#{duplicate_logs[1].id}/purchaser-code?first_remaining_duplicate_id=#{sales_log.id}&organisation_id=#{sales_log.owning_organisation_id}&original_log_id=#{sales_log.id}&referrer=duplicate_logs")
@@ -216,7 +217,8 @@ RSpec.describe DuplicateLogsController, type: :request do
                 expect(page).to have_content("- Buyer 1’s gender identity", count: 1)
                 expect(page).to have_content("- Buyer 1’s working situation", count: 1)
                 expect(page).to have_content("- Postcode", count: 1)
-                expect(page).to have_link("Change", count: 7)
+                expect(page).to have_content("- Address line 1", count: 1)
+                expect(page).to have_link("Change", count: 8)
                 expect(page).to have_link("Change", href: "/sales-logs/#{sales_log.id}/purchaser-code?original_log_id=#{sales_log.id}&referrer=interruption_screen")
               end
 
@@ -242,7 +244,8 @@ RSpec.describe DuplicateLogsController, type: :request do
                 expect(page).to have_content("- Buyer 1’s gender identity", count: 1)
                 expect(page).to have_content("- Buyer 1’s working situation", count: 1)
                 expect(page).to have_content("- Postcode", count: 1)
-                expect(page).to have_link("Change", count: 7)
+                expect(page).to have_content("- Address line 1", count: 1)
+                expect(page).to have_link("Change", count: 8)
                 expect(page).to have_link("Change", href: "/sales-logs/#{sales_log.id}/purchaser-code?original_log_id=#{sales_log.id}&referrer=interruption_screen")
               end
 
@@ -377,7 +380,8 @@ RSpec.describe DuplicateLogsController, type: :request do
               expect(page).to have_content("- Buyer 1’s gender identity", count: 3)
               expect(page).to have_content("- Buyer 1’s working situation", count: 3)
               expect(page).to have_content("- Postcode", count: 3)
-              expect(page).to have_link("Change", count: 18)
+              expect(page).to have_content("- Address line 1", count: 3)
+              expect(page).to have_link("Change", count: 21)
               expect(page).to have_link("Change", href: "/sales-logs/#{sales_log.id}/purchaser-code?first_remaining_duplicate_id=#{duplicate_logs[0].id}&original_log_id=#{sales_log.id}&referrer=duplicate_logs")
               expect(page).to have_link("Change", href: "/sales-logs/#{duplicate_logs[0].id}/purchaser-code?first_remaining_duplicate_id=#{sales_log.id}&original_log_id=#{sales_log.id}&referrer=duplicate_logs")
               expect(page).to have_link("Change", href: "/sales-logs/#{duplicate_logs[1].id}/purchaser-code?first_remaining_duplicate_id=#{sales_log.id}&original_log_id=#{sales_log.id}&referrer=duplicate_logs")
@@ -405,7 +409,8 @@ RSpec.describe DuplicateLogsController, type: :request do
                 expect(page).to have_content("- Buyer 1’s gender identity", count: 1)
                 expect(page).to have_content("- Buyer 1’s working situation", count: 1)
                 expect(page).to have_content("- Postcode", count: 1)
-                expect(page).to have_link("Change", count: 6)
+                expect(page).to have_content("- Address line 1", count: 1)
+                expect(page).to have_link("Change", count: 7)
                 expect(page).to have_link("Change", href: "/sales-logs/#{sales_log.id}/purchaser-code?original_log_id=#{sales_log.id}&referrer=interruption_screen")
               end
 
@@ -431,7 +436,8 @@ RSpec.describe DuplicateLogsController, type: :request do
                 expect(page).to have_content("- Buyer 1’s gender identity", count: 1)
                 expect(page).to have_content("- Buyer 1’s working situation", count: 1)
                 expect(page).to have_content("- Postcode", count: 1)
-                expect(page).to have_link("Change", count: 6)
+                expect(page).to have_content("- Address line 1", count: 1)
+                expect(page).to have_link("Change", count: 7)
                 expect(page).to have_link("Change", href: "/sales-logs/#{sales_log.id}/purchaser-code?original_log_id=#{sales_log.id}&referrer=interruption_screen")
               end
 
diff --git a/spec/services/bulk_upload/sales/validator_spec.rb b/spec/services/bulk_upload/sales/validator_spec.rb
index 263bb92f8..9d4458a95 100644
--- a/spec/services/bulk_upload/sales/validator_spec.rb
+++ b/spec/services/bulk_upload/sales/validator_spec.rb
@@ -225,7 +225,7 @@ RSpec.describe BulkUpload::Sales::Validator do
       end
 
       it "creates errors" do
-        expect { validator.call }.to change(BulkUploadError.where(category: :setup, error: "This is a duplicate of a log in your file."), :count).by(20)
+        expect { validator.call }.to change(BulkUploadError.where(category: :setup, error: "This is a duplicate of a log in your file."), :count).by(24)
       end
     end
   end
diff --git a/spec/services/bulk_upload/sales/year2025/row_parser_spec.rb b/spec/services/bulk_upload/sales/year2025/row_parser_spec.rb
index ebebc38b8..a1df099ad 100644
--- a/spec/services/bulk_upload/sales/year2025/row_parser_spec.rb
+++ b/spec/services/bulk_upload/sales/year2025/row_parser_spec.rb
@@ -784,6 +784,8 @@ RSpec.describe BulkUpload::Sales::Year2025::RowParser do
           :field_1, # Sale completion date
           :field_2, # Sale completion date
           :field_3, # Sale completion date
+          :field_16, # UPRN
+          :field_17, # Address line 1
           :field_21, # Postcode
           :field_22, # Postcode
           :field_28, # Buyer 1 age
@@ -814,6 +816,8 @@ RSpec.describe BulkUpload::Sales::Year2025::RowParser do
           :field_1, # Sale completion date
           :field_2, # Sale completion date
           :field_3, # Sale completion date
+          :field_16, # UPRN
+          :field_17, # Address line 1
           :field_21, # Postcode
           :field_22, # Postcode
           :field_28, # Buyer 1 age
diff --git a/spec/services/bulk_upload/sales/year2026/row_parser_spec.rb b/spec/services/bulk_upload/sales/year2026/row_parser_spec.rb
index 092e86b58..ba0e04c91 100644
--- a/spec/services/bulk_upload/sales/year2026/row_parser_spec.rb
+++ b/spec/services/bulk_upload/sales/year2026/row_parser_spec.rb
@@ -790,6 +790,8 @@ RSpec.describe BulkUpload::Sales::Year2026::RowParser do
           :field_1, # Sale completion date
           :field_2, # Sale completion date
           :field_3, # Sale completion date
+          :field_16, # UPRN
+          :field_17, # Address line 1
           :field_21, # Postcode
           :field_22, # Postcode
           :field_28, # Buyer 1 age
@@ -820,6 +822,8 @@ RSpec.describe BulkUpload::Sales::Year2026::RowParser do
           :field_1, # Sale completion date
           :field_2, # Sale completion date
           :field_3, # Sale completion date
+          :field_16, # UPRN
+          :field_17, # Address line 1
           :field_21, # Postcode
           :field_22, # Postcode
           :field_28, # Buyer 1 age