diff --git a/app/models/sales_log.rb b/app/models/sales_log.rb
index cf9e0dd44..1a1fa42e4 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
@@ -502,10 +507,12 @@ 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/spec/factories/sales_log.rb b/spec/factories/sales_log.rb
index 2cdc688be..ba4d20b7c 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 }