diff --git a/app/models/form/sales/pages/buyer_interview.rb b/app/models/form/sales/pages/buyer_interview.rb
index 2d20a9490..f9c4e3bbc 100644
--- a/app/models/form/sales/pages/buyer_interview.rb
+++ b/app/models/form/sales/pages/buyer_interview.rb
@@ -14,7 +14,7 @@ class Form::Sales::Pages::BuyerInterview < ::Form::Page
     if @joint_purchase
       [{ "joint_purchase?" => true }]
     else
-      [{ "not_joint_purchase?" => true }]
+      [{ "not_joint_purchase?" => true }, { "jointpur" => nil }]
     end
   end
 end
diff --git a/app/models/form/sales/pages/deposit_value_check.rb b/app/models/form/sales/pages/deposit_value_check.rb
index 43a60ee51..cca25a43b 100644
--- a/app/models/form/sales/pages/deposit_value_check.rb
+++ b/app/models/form/sales/pages/deposit_value_check.rb
@@ -37,7 +37,7 @@ class Form::Sales::Pages::DepositValueCheck < ::Form::Page
     if @joint_purchase
       [{ "joint_purchase?" => true, "deposit_over_soft_max?" => true }]
     else
-      [{ "not_joint_purchase?" => true, "deposit_over_soft_max?" => true }]
+      [{ "not_joint_purchase?" => true, "deposit_over_soft_max?" => true }, { "jointpur" => nil, "deposit_over_soft_max?" => true }]
     end
   end
 end
diff --git a/app/models/form/sales/pages/housing_benefits.rb b/app/models/form/sales/pages/housing_benefits.rb
index e2b72790f..90d721ad8 100644
--- a/app/models/form/sales/pages/housing_benefits.rb
+++ b/app/models/form/sales/pages/housing_benefits.rb
@@ -14,7 +14,7 @@ class Form::Sales::Pages::HousingBenefits < ::Form::Page
     if @joint_purchase
       [{ "joint_purchase?" => true }]
     else
-      [{ "not_joint_purchase?" => true }]
+      [{ "not_joint_purchase?" => true }, { "jointpur" => nil }]
     end
   end
 end
diff --git a/app/models/form/sales/pages/living_before_purchase.rb b/app/models/form/sales/pages/living_before_purchase.rb
index 95bfabc11..c5dd64330 100644
--- a/app/models/form/sales/pages/living_before_purchase.rb
+++ b/app/models/form/sales/pages/living_before_purchase.rb
@@ -22,7 +22,7 @@ class Form::Sales::Pages::LivingBeforePurchase < ::Form::Page
     if @joint_purchase
       [{ "joint_purchase?" => true }]
     else
-      [{ "not_joint_purchase?" => true }]
+      [{ "not_joint_purchase?" => true }, { "jointpur" => nil }]
     end
   end
 end
diff --git a/app/models/form/sales/pages/old_persons_shared_ownership_value_check.rb b/app/models/form/sales/pages/old_persons_shared_ownership_value_check.rb
index 101f30f88..0254804f0 100644
--- a/app/models/form/sales/pages/old_persons_shared_ownership_value_check.rb
+++ b/app/models/form/sales/pages/old_persons_shared_ownership_value_check.rb
@@ -26,7 +26,8 @@ class Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck < ::Form::Page
     if @joint_purchase
       [{ "joint_purchase?" => true, "buyers_age_for_old_persons_shared_ownership_invalid?" => true }]
     else
-      [{ "not_joint_purchase?" => true, "buyers_age_for_old_persons_shared_ownership_invalid?" => true }]
+      [{ "not_joint_purchase?" => true, "buyers_age_for_old_persons_shared_ownership_invalid?" => true },
+       { "jointpur" => nil, "buyers_age_for_old_persons_shared_ownership_invalid?" => true }]
     end
   end
 end
diff --git a/app/models/form/sales/pages/privacy_notice.rb b/app/models/form/sales/pages/privacy_notice.rb
index 818baaa02..ea3c387d6 100644
--- a/app/models/form/sales/pages/privacy_notice.rb
+++ b/app/models/form/sales/pages/privacy_notice.rb
@@ -15,7 +15,7 @@ class Form::Sales::Pages::PrivacyNotice < ::Form::Page
     if @joint_purchase
       [{ "joint_purchase?" => true }]
     else
-      [{ "not_joint_purchase?" => true }]
+      [{ "not_joint_purchase?" => true }, { "jointpur" => nil }]
     end
   end
 end
diff --git a/app/models/form/sales/pages/savings.rb b/app/models/form/sales/pages/savings.rb
index 462a1f82c..7a13dbe34 100644
--- a/app/models/form/sales/pages/savings.rb
+++ b/app/models/form/sales/pages/savings.rb
@@ -15,7 +15,7 @@ class Form::Sales::Pages::Savings < ::Form::Page
     if @joint_purchase
       [{ "joint_purchase?" => true }]
     else
-      [{ "not_joint_purchase?" => true }]
+      [{ "not_joint_purchase?" => true }, { "jointpur" => nil }]
     end
   end
 end
diff --git a/app/models/form/sales/pages/savings_value_check.rb b/app/models/form/sales/pages/savings_value_check.rb
index 0febd1edb..bcb95abc9 100644
--- a/app/models/form/sales/pages/savings_value_check.rb
+++ b/app/models/form/sales/pages/savings_value_check.rb
@@ -32,7 +32,8 @@ class Form::Sales::Pages::SavingsValueCheck < ::Form::Page
     if @joint_purchase
       [{ "joint_purchase?" => true, "savings_over_soft_max?" => true }]
     else
-      [{ "not_joint_purchase?" => true, "savings_over_soft_max?" => true }]
+      [{ "not_joint_purchase?" => true, "savings_over_soft_max?" => true },
+       { "jointpur" => nil, "savings_over_soft_max?" => true }]
     end
   end
 end
diff --git a/spec/models/form/sales/pages/deposit_value_check_spec.rb b/spec/models/form/sales/pages/deposit_value_check_spec.rb
index 172f3000d..026102ef4 100644
--- a/spec/models/form/sales/pages/deposit_value_check_spec.rb
+++ b/spec/models/form/sales/pages/deposit_value_check_spec.rb
@@ -29,6 +29,10 @@ RSpec.describe Form::Sales::Pages::DepositValueCheck, type: :model do
         "deposit_over_soft_max?" => true,
         "not_joint_purchase?" => true,
       },
+      {
+        "deposit_over_soft_max?" => true,
+        "jointpur" => nil,
+      },
     ])
   end
 
diff --git a/spec/models/form/sales/pages/housing_benefits_spec.rb b/spec/models/form/sales/pages/housing_benefits_spec.rb
index d87e00850..bbd8d5c18 100644
--- a/spec/models/form/sales/pages/housing_benefits_spec.rb
+++ b/spec/models/form/sales/pages/housing_benefits_spec.rb
@@ -30,7 +30,7 @@ RSpec.describe Form::Sales::Pages::HousingBenefits, type: :model do
 
   context "when joint_purchase is false" do
     it "has correct depends_on" do
-      expect(page.depends_on).to eq([{ "not_joint_purchase?" => true }])
+      expect(page.depends_on).to eq([{ "not_joint_purchase?" => true }, { "jointpur" => nil }])
     end
   end
 
diff --git a/spec/models/form/sales/pages/living_before_purchase_spec.rb b/spec/models/form/sales/pages/living_before_purchase_spec.rb
index 825f60b27..d12cff216 100644
--- a/spec/models/form/sales/pages/living_before_purchase_spec.rb
+++ b/spec/models/form/sales/pages/living_before_purchase_spec.rb
@@ -44,7 +44,7 @@ RSpec.describe Form::Sales::Pages::LivingBeforePurchase, type: :model do
   end
 
   it "has correct depends_on" do
-    expect(page.depends_on).to eq([{ "not_joint_purchase?" => true }])
+    expect(page.depends_on).to eq([{ "not_joint_purchase?" => true }, { "jointpur" => nil }])
   end
 
   context "with joint purchase" do
diff --git a/spec/models/form/sales/pages/old_persons_shared_ownership_value_check_spec.rb b/spec/models/form/sales/pages/old_persons_shared_ownership_value_check_spec.rb
index 0f4649ea8..fce6a5e69 100644
--- a/spec/models/form/sales/pages/old_persons_shared_ownership_value_check_spec.rb
+++ b/spec/models/form/sales/pages/old_persons_shared_ownership_value_check_spec.rb
@@ -29,6 +29,10 @@ RSpec.describe Form::Sales::Pages::OldPersonsSharedOwnershipValueCheck, type: :m
         "buyers_age_for_old_persons_shared_ownership_invalid?" => true,
         "not_joint_purchase?" => true,
       },
+      {
+        "buyers_age_for_old_persons_shared_ownership_invalid?" => true,
+        "jointpur" => nil,
+      },
     ])
   end
 
diff --git a/spec/models/form/sales/pages/privacy_notice_spec.rb b/spec/models/form/sales/pages/privacy_notice_spec.rb
index 0a3d389cf..605a1d35d 100644
--- a/spec/models/form/sales/pages/privacy_notice_spec.rb
+++ b/spec/models/form/sales/pages/privacy_notice_spec.rb
@@ -34,7 +34,7 @@ RSpec.describe Form::Sales::Pages::PrivacyNotice, type: :model do
   end
 
   it "has correct depends_on" do
-    expect(page.depends_on).to eq([{ "not_joint_purchase?" => true }])
+    expect(page.depends_on).to eq([{ "not_joint_purchase?" => true }, { "jointpur" => nil }])
   end
 
   context "with joint purchase" do
diff --git a/spec/models/form/sales/pages/savings_spec.rb b/spec/models/form/sales/pages/savings_spec.rb
index 04c7279f9..a7363d3d4 100644
--- a/spec/models/form/sales/pages/savings_spec.rb
+++ b/spec/models/form/sales/pages/savings_spec.rb
@@ -28,7 +28,7 @@ RSpec.describe Form::Sales::Pages::Savings, type: :model do
   end
 
   it "has correct depends_on" do
-    expect(page.depends_on).to eq([{ "not_joint_purchase?" => true }])
+    expect(page.depends_on).to eq([{ "not_joint_purchase?" => true }, { "jointpur" => nil }])
   end
 
   context "with joint purchase" do
diff --git a/spec/models/form/sales/pages/savings_value_check_spec.rb b/spec/models/form/sales/pages/savings_value_check_spec.rb
index cd9b5ef34..7f530e3c6 100644
--- a/spec/models/form/sales/pages/savings_value_check_spec.rb
+++ b/spec/models/form/sales/pages/savings_value_check_spec.rb
@@ -27,6 +27,8 @@ RSpec.describe Form::Sales::Pages::SavingsValueCheck, type: :model do
     expect(page.depends_on).to eq([
       { "not_joint_purchase?" => true,
         "savings_over_soft_max?" => true },
+      { "jointpur" => nil,
+        "savings_over_soft_max?" => true },
     ])
   end
 
diff --git a/spec/models/validations/shared_validations_spec.rb b/spec/models/validations/shared_validations_spec.rb
index 52b325c29..2a154761b 100644
--- a/spec/models/validations/shared_validations_spec.rb
+++ b/spec/models/validations/shared_validations_spec.rb
@@ -89,8 +89,9 @@ RSpec.describe Validations::SharedValidations do
 
     it "adds the correct validation text when a question has a min but not a max" do
       sales_log.savings = -10
+      sales_log.jointpur = 1
       shared_validator.validate_numeric_min_max(sales_log)
-      expect(sales_log.errors["savings"]).to include(match I18n.t("validations.numeric.above_min", field: "Buyer’s total savings before any deposit paid", min: "£0"))
+      expect(sales_log.errors["savings"]).to include(match I18n.t("validations.numeric.above_min", field: "Buyers’ total savings before any deposit paid", min: "£0"))
     end
 
     context "when validating percent" do
@@ -138,14 +139,16 @@ RSpec.describe Validations::SharedValidations do
     context "when validating a question with a step of 10" do
       it "adds an error if input is not a multiple of ten" do
         sales_log.savings = 30_005
+        sales_log.jointpur = 1
         shared_validator.validate_numeric_step(sales_log)
-        expect(sales_log.errors[:savings]).to include I18n.t("validations.numeric.nearest_ten", field: "Buyer’s total savings before any deposit paid")
+        expect(sales_log.errors[:savings]).to include I18n.t("validations.numeric.nearest_ten", field: "Buyers’ total savings before any deposit paid")
       end
 
       it "adds an error if the user attempts to input a number in exponent format" do
         sales_log.savings = "3e5"
+        sales_log.jointpur = 1
         shared_validator.validate_numeric_step(sales_log)
-        expect(sales_log.errors[:savings]).to include I18n.t("validations.numeric.nearest_ten", field: "Buyer’s total savings before any deposit paid")
+        expect(sales_log.errors[:savings]).to include I18n.t("validations.numeric.nearest_ten", field: "Buyers’ total savings before any deposit paid")
       end
 
       it "does not add an error if input is a multiple of ten" do