diff --git a/app/models/derived_variables/sales_log_variables.rb b/app/models/derived_variables/sales_log_variables.rb
index 7284e238e..7f160b637 100644
--- a/app/models/derived_variables/sales_log_variables.rb
+++ b/app/models/derived_variables/sales_log_variables.rb
@@ -98,8 +98,8 @@ module DerivedVariables::SalesLogVariables
     self.numstair = is_firststair? ? 1 : nil if numstair == 1 && firststair_changed?
     self.mrent = 0 if stairowned_100?
 
-    if buyer_interviewed_changed_to_not_interviewed_and_mortgage_length_known?
-      self.mortgage_length_known = 0
+    if buyer_interviewed_changed_to_not_interviewed_and_mortlen_set?
+      self.mortlen_known = 0
     end
 
     set_encoded_derived_values!(DEPENDENCIES)
diff --git a/app/models/form/sales/questions/mortgage_length_known.rb b/app/models/form/sales/questions/mortgage_length_known.rb
index d2f7e1d0c..e92affb6b 100644
--- a/app/models/form/sales/questions/mortgage_length_known.rb
+++ b/app/models/form/sales/questions/mortgage_length_known.rb
@@ -1,13 +1,13 @@
 class Form::Sales::Questions::MortgageLengthKnown < ::Form::Question
   def initialize(id, hsh, page, ownershipsch:)
     super(id, hsh, page)
-    @id = "mortgage_length_known"
+    @id = "mortlen_known"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
     @conditional_for = { "mortlen" => [0] }
     @hidden_in_check_answers = {
       "depends_on" => [
-        { "mortgage_length_known" => 0 },
+        { "mortlen_known" => 0 },
       ],
     }
     @question_number = QUESTION_NUMBER_FROM_YEAR_AND_OWNERSHIP.fetch(form.start_date.year, QUESTION_NUMBER_FROM_YEAR_AND_OWNERSHIP.max_by { |k, _v| k }.last)[ownershipsch]
diff --git a/app/models/sales_log.rb b/app/models/sales_log.rb
index de4c3c95c..654808d3a 100644
--- a/app/models/sales_log.rb
+++ b/app/models/sales_log.rb
@@ -390,7 +390,7 @@ class SalesLog < Log
     proptype_changed? && proptype_was == 2
   end
 
-  def buyer_interviewed_changed_to_not_interviewed_and_mortgage_length_known?
+  def buyer_interviewed_changed_to_not_interviewed_and_mortlen_set?
     noint_changed? && noint_was == 2 && buyer_not_interviewed? && mortlen.present?
   end
 
diff --git a/app/services/bulk_upload/sales/year2026/row_parser.rb b/app/services/bulk_upload/sales/year2026/row_parser.rb
index b7a327eae..069aabfef 100644
--- a/app/services/bulk_upload/sales/year2026/row_parser.rb
+++ b/app/services/bulk_upload/sales/year2026/row_parser.rb
@@ -776,7 +776,7 @@ private
 
       hb: %i[field_74],
       mortlen: mortlen_fields,
-      mortgage_length_known: mortlen_fields,
+      mortlen_known: mortlen_fields,
       proplen: proplen_fields,
 
       jointmore: %i[field_13],
@@ -954,7 +954,7 @@ private
     attributes["hb"] = field_74
 
     attributes["mortlen"] = mortlen != "R" ? mortlen : nil
-    attributes["mortgage_length_known"] = mortgage_length_known
+    attributes["mortlen_known"] = mortlen_known
 
     attributes["proplen"] = proplen if proplen&.positive?
     attributes["proplen_asked"] = attributes["proplen"].present? ? 0 : 1
@@ -1179,7 +1179,7 @@ private
     field_118 if discounted_ownership?
   end
 
-  def mortgage_length_known
+  def mortlen_known
     return nil if buyer_interviewed?
 
     if mortlen == "R"
diff --git a/config/locales/forms/2026/sales/sale_information.en.yml b/config/locales/forms/2026/sales/sale_information.en.yml
index c74388ff0..b253e4074 100644
--- a/config/locales/forms/2026/sales/sale_information.en.yml
+++ b/config/locales/forms/2026/sales/sale_information.en.yml
@@ -204,7 +204,7 @@ en:
             hint_text: "You should round up to the nearest year. Value should not exceed 60 years."
             question_text: "What is the length of the mortgage?"
 
-          mortgage_length_known:
+          mortlen_known:
             page_header: ""
             check_answer_label: "Length of mortgage known"
             check_answer_prompt: ""
diff --git a/db/migrate/20260224141705_add_mortgage_length_known_to_sales_logs.rb b/db/migrate/20260224141705_add_mortlen_known_to_sales_logs.rb
similarity index 60%
rename from db/migrate/20260224141705_add_mortgage_length_known_to_sales_logs.rb
rename to db/migrate/20260224141705_add_mortlen_known_to_sales_logs.rb
index 745432ac9..6146e5de7 100644
--- a/db/migrate/20260224141705_add_mortgage_length_known_to_sales_logs.rb
+++ b/db/migrate/20260224141705_add_mortlen_known_to_sales_logs.rb
@@ -1,5 +1,5 @@
 class AddMortgageLengthKnownToSalesLogs < ActiveRecord::Migration[7.2]
   def change
-    add_column :sales_logs, :mortgage_length_known, :integer
+    add_column :sales_logs, :mortlen_known, :integer
   end
 end
diff --git a/db/schema.rb b/db/schema.rb
index 6f754f7de..18be9464e 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -822,7 +822,7 @@ ActiveRecord::Schema[7.2].define(version: 2026_02_24_141705) do
     t.string "sexrab4"
     t.string "sexrab5"
     t.string "sexrab6"
-    t.integer "mortgage_length_known"
+    t.integer "mortlen_known"
     t.index ["assigned_to_id"], name: "index_sales_logs_on_assigned_to_id"
     t.index ["bulk_upload_id"], name: "index_sales_logs_on_bulk_upload_id"
     t.index ["created_by_id"], name: "index_sales_logs_on_created_by_id"
diff --git a/spec/factories/sales_log.rb b/spec/factories/sales_log.rb
index 7b0aaa4cd..6baee3100 100644
--- a/spec/factories/sales_log.rb
+++ b/spec/factories/sales_log.rb
@@ -166,7 +166,7 @@ FactoryBot.define do
       has_mscharge { 1 }
       mscharge { 100 }
       mortlen { 10 }
-      mortgage_length_known { 0 }
+      mortlen_known { 0 }
       pcodenk { 0 }
       postcode_full { "SW1A 1AA" }
       is_la_inferred { false }
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 24bb06dad..e20b21232 100644
--- a/spec/services/bulk_upload/sales/year2026/row_parser_spec.rb
+++ b/spec/services/bulk_upload/sales/year2026/row_parser_spec.rb
@@ -2019,7 +2019,7 @@ RSpec.describe BulkUpload::Sales::Year2026::RowParser do
       end
     end
 
-    describe "mortlen amd mortgage_length_known" do
+    describe "mortlen amd mortlen_known" do
       context "when field_90 is a number" do
         let(:field_90_number_attributes) { valid_attributes.merge({ field_90: 20 }) }
 
@@ -2031,9 +2031,9 @@ RSpec.describe BulkUpload::Sales::Year2026::RowParser do
             expect(log.mortlen).to eq(20)
           end
 
-          it "sets mortgage_length_known to yes" do
+          it "sets mortlen_known to yes" do
             log = parser.log
-            expect(log.mortgage_length_known).to eq(0)
+            expect(log.mortlen_known).to eq(0)
           end
         end
 
@@ -2045,9 +2045,9 @@ RSpec.describe BulkUpload::Sales::Year2026::RowParser do
             expect(log.mortlen).to eq(20)
           end
 
-          it "sets mortgage_length_known to nil" do
+          it "sets mortlen_known to nil" do
             log = parser.log
-            expect(log.mortgage_length_known).to be_nil
+            expect(log.mortlen_known).to be_nil
           end
         end
       end
@@ -2063,9 +2063,9 @@ RSpec.describe BulkUpload::Sales::Year2026::RowParser do
             expect(log.mortlen).to be_nil
           end
 
-          it "sets mortgage_length_known to no" do
+          it "sets mortlen_known to no" do
             log = parser.log
-            expect(log.mortgage_length_known).to eq(1)
+            expect(log.mortlen_known).to eq(1)
           end
         end
       end