diff --git a/app/services/bulk_upload/lettings/year2025/row_parser.rb b/app/services/bulk_upload/lettings/year2025/row_parser.rb
index 0745056d2..ac508f2c2 100644
--- a/app/services/bulk_upload/lettings/year2025/row_parser.rb
+++ b/app/services/bulk_upload/lettings/year2025/row_parser.rb
@@ -148,6 +148,26 @@ class BulkUpload::Lettings::Year2025::RowParser
 
   ERROR_BASE_KEY = "validations.lettings.2025.bulk_upload".freeze
 
+  CASE_INSENSITIVE_FIELDS = [
+    :field_42, # What is the lead tenant’s age?
+    :field_48, # What is person 2’s age?
+    :field_52, # What is person 3’s age?
+    :field_56, # What is person 4’s age?
+    :field_60, # What is person 5’s age?
+    :field_64, # What is person 6’s age?
+    :field_68, # What is person 7’s age?
+    :field_72, # What is person 8’s age?
+
+    :field_43, # Which of these best describes the lead tenant’s gender identity?
+    :field_49, # Which of these best describes person 2’s gender identity?
+    :field_53, # Which of these best describes person 3’s gender identity?
+    :field_57, # Which of these best describes person 4’s gender identity?
+    :field_61, # Which of these best describes person 5’s gender identity?
+    :field_65, # Which of these best describes person 6’s gender identity?
+    :field_69, # Which of these best describes person 7’s gender identity?
+    :field_73, # Which of these best describes person 8’s gender identity?
+  ].freeze
+
   attribute :bulk_upload
   attribute :block_log_creation, :boolean, default: -> { false }
 
@@ -459,6 +479,8 @@ class BulkUpload::Lettings::Year2025::RowParser
 
     return @valid = true if blank_row?
 
+    normalise_case_insensitive_fields
+
     super(:before_log)
     @before_errors = errors.dup
 
@@ -560,6 +582,13 @@ class BulkUpload::Lettings::Year2025::RowParser
 
 private
 
+  def normalise_case_insensitive_fields
+    CASE_INSENSITIVE_FIELDS.each do |field|
+      value = send(field)
+      send("#{field}=", value.upcase) if value.present?
+    end
+  end
+
   def validate_valid_radio_option
     log.attributes.each do |question_id, _v|
       question = log.form.get_question(question_id, log)
diff --git a/app/services/bulk_upload/sales/year2025/row_parser.rb b/app/services/bulk_upload/sales/year2025/row_parser.rb
index a78b9fe5d..8e406dcd0 100644
--- a/app/services/bulk_upload/sales/year2025/row_parser.rb
+++ b/app/services/bulk_upload/sales/year2025/row_parser.rb
@@ -139,6 +139,29 @@ class BulkUpload::Sales::Year2025::RowParser
 
   ERROR_BASE_KEY = "validations.sales.2025.bulk_upload".freeze
 
+  CASE_INSENSITIVE_FIELDS = [
+    :field_28, # Age of buyer 1
+    :field_35, # Age of person 2
+    :field_43, # Age of person 3
+    :field_47, # Age of person 4
+    :field_51, # Age of person 5
+    :field_55, # Age of person 6
+
+    :field_29, # Gender identity of buyer 1
+    :field_36, # Gender identity of person 2
+    :field_44, # Gender identity of person 3
+    :field_48, # Gender identity of person 4
+    :field_52, # Gender identity of person 5
+    :field_56, # Gender identity of person 6
+
+    :field_58, # What was buyer 1’s previous tenure?
+    :field_64, # What was buyer 2’s previous tenure?
+
+    :field_75, # What is the total amount the buyers had in savings before they paid any deposit for the property?
+    :field_70, # What is buyer 1’s gross annual income?
+    :field_72, # What is buyer 2’s gross annual income?
+  ].freeze
+
   attribute :bulk_upload
   attribute :block_log_creation, :boolean, default: -> { false }
 
@@ -454,6 +477,8 @@ class BulkUpload::Sales::Year2025::RowParser
 
     return true if blank_row?
 
+    normalise_case_insensitive_fields
+
     super(:before_log)
     @before_errors = errors.dup
 
@@ -525,6 +550,13 @@ class BulkUpload::Sales::Year2025::RowParser
 
 private
 
+  def normalise_case_insensitive_fields
+    CASE_INSENSITIVE_FIELDS.each do |field|
+      value = send(field)
+      send("#{field}=", value.upcase) if value.present?
+    end
+  end
+
   def prevtenbuy2
     case field_64
     when "R"