diff --git a/app/models/form/sales/pages/percentage_discount_value_check.rb b/app/models/form/sales/pages/percentage_discount_value_check.rb
new file mode 100644
index 000000000..1e3beb3e6
--- /dev/null
+++ b/app/models/form/sales/pages/percentage_discount_value_check.rb
@@ -0,0 +1,15 @@
+class Form::Sales::Pages::PercentageDiscountValueCheck < ::Form::Page
+  def initialize(id, hsh, subsection)
+    super
+    @title_text = {
+      "translation" => "soft_validations.percentage_discount_value.title_text",
+      "arguments" => [{ "key" => "discount", "label" => true, "i18n_template" => "discount" }],
+    }
+    @informative_text = {}
+    @depends_on = [{ "percentage_discount_invalid?" => true }]
+  end
+
+  def questions
+    @questions ||= [Form::Sales::Questions::PercentageDiscountValueCheck.new(nil, nil, self)]
+  end
+end
diff --git a/app/models/form/sales/questions/percentage_discount_value_check.rb b/app/models/form/sales/questions/percentage_discount_value_check.rb
new file mode 100644
index 000000000..9ac5547b4
--- /dev/null
+++ b/app/models/form/sales/questions/percentage_discount_value_check.rb
@@ -0,0 +1,23 @@
+class Form::Sales::Questions::PercentageDiscountValueCheck < ::Form::Question
+  def initialize(id, hsh, page)
+    super
+    @id = "percentage_discount_value_check"
+    @check_answer_label = "Percentage discount confirmation"
+    @header = "Are you sure this is correct?"
+    @type = "interruption_screen"
+    @answer_options = {
+      "0" => { "value" => "Yes" },
+      "1" => { "value" => "No" },
+    }
+    @hidden_in_check_answers = {
+      "depends_on" => [
+        {
+          "percentage_discount_value_check" => 0,
+        },
+        {
+          "percentage_discount_value_check" => 1,
+        },
+      ],
+    }
+  end
+end
diff --git a/app/models/form/sales/subsections/discounted_ownership_scheme.rb b/app/models/form/sales/subsections/discounted_ownership_scheme.rb
index 09813339d..52ee9e95c 100644
--- a/app/models/form/sales/subsections/discounted_ownership_scheme.rb
+++ b/app/models/form/sales/subsections/discounted_ownership_scheme.rb
@@ -11,6 +11,7 @@ class Form::Sales::Subsections::DiscountedOwnershipScheme < ::Form::Subsection
       Form::Sales::Pages::LivingBeforePurchase.new("living_before_purchase_discounted_ownership", nil, self, ownershipsch: 2),
       Form::Sales::Pages::AboutPriceRtb.new(nil, nil, self),
       Form::Sales::Pages::ExtraBorrowingValueCheck.new("extra_borrowing_price_value_check", nil, self),
+      Form::Sales::Pages::PercentageDiscountValueCheck.new("percentage_discount_value_check", nil, self),
       Form::Sales::Pages::AboutPriceNotRtb.new(nil, nil, self),
       Form::Sales::Pages::GrantValueCheck.new(nil, nil, self),
       Form::Sales::Pages::PurchasePriceOutrightOwnership.new("purchase_price_discounted_ownership", nil, self, ownershipsch: 2),
diff --git a/app/models/form/sales/subsections/property_information.rb b/app/models/form/sales/subsections/property_information.rb
index cca34a764..95d8485c8 100644
--- a/app/models/form/sales/subsections/property_information.rb
+++ b/app/models/form/sales/subsections/property_information.rb
@@ -13,6 +13,7 @@ class Form::Sales::Subsections::PropertyInformation < ::Form::Subsection
       Form::Sales::Pages::AboutPriceValueCheck.new("about_price_bedrooms_value_check", nil, self),
       Form::Sales::Pages::PropertyUnitType.new(nil, nil, self),
       Form::Sales::Pages::MonthlyChargesValueCheck.new("monthly_charges_property_type_value_check", nil, self),
+      Form::Sales::Pages::PercentageDiscountValueCheck.new("percentage_discount_proptype_value_check", nil, self),
       Form::Sales::Pages::PropertyBuildingType.new(nil, nil, self),
       postcode_and_la_questions,
       Form::Sales::Pages::AboutPriceValueCheck.new("about_price_la_value_check", nil, self),
diff --git a/app/models/validations/sales/soft_validations.rb b/app/models/validations/sales/soft_validations.rb
index 354bc7fd7..19d150c7e 100644
--- a/app/models/validations/sales/soft_validations.rb
+++ b/app/models/validations/sales/soft_validations.rb
@@ -136,6 +136,17 @@ module Validations::Sales::SoftValidations
     (discounted_ownership_sale? || shared_ownership_scheme?) && buy2livein == 2
   end
 
+  def percentage_discount_invalid?
+    return unless discount && proptype
+
+    case proptype
+    when 1, 2
+      discount > 50
+    when 3, 4, 9
+      discount > 35
+    end
+  end
+
 private
 
   def sale_range
diff --git a/app/services/imports/sales_logs_import_service.rb b/app/services/imports/sales_logs_import_service.rb
index e02d7d23c..2d6551189 100644
--- a/app/services/imports/sales_logs_import_service.rb
+++ b/app/services/imports/sales_logs_import_service.rb
@@ -156,6 +156,7 @@ module Imports
       attributes["student_not_child_value_check"] = 0
       attributes["discounted_sale_value_check"] = 0
       attributes["buyer_livein_value_check"] = 0
+      attributes["percentage_discount_value_check"] = 0
 
       # Sets the log creator
       owner_id = meta_field_value(xml_doc, "owner-user-id").strip
@@ -280,7 +281,8 @@ module Imports
          saledate_check
          student_not_child_value_check
          discounted_sale_value_check
-         buyer_livein_value_check]
+         buyer_livein_value_check
+         percentage_discount_value_check]
     end
 
     def check_status_completed(sales_log, previous_status)
diff --git a/config/locales/en.yml b/config/locales/en.yml
index d333accd8..f0b52ce9f 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -555,6 +555,8 @@ en:
       title_text: "You told us that buyer 1 will not live in the property. For %{ownership_scheme} types, the buyer usually lives in the property."
     buyer2_livein_wrong_for_ownership_type:
       title_text: "You told us that buyer 2 will not live in the property. For %{ownership_scheme} types, the buyer usually lives in the property."
+    percentage_discount_value:
+      title_text: "You told us that the percentage discount was %{discount}. This seems high for this type of property."
 
   devise:
     two_factor_authentication:
diff --git a/db/migrate/20230405074138_add_percentage_discount_value_check.rb b/db/migrate/20230405074138_add_percentage_discount_value_check.rb
new file mode 100644
index 000000000..adce0fe58
--- /dev/null
+++ b/db/migrate/20230405074138_add_percentage_discount_value_check.rb
@@ -0,0 +1,5 @@
+class AddPercentageDiscountValueCheck < ActiveRecord::Migration[7.0]
+  def change
+    add_column :sales_logs, :percentage_discount_value_check, :integer
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 8a14eed1d..e121fda09 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -574,6 +574,7 @@ ActiveRecord::Schema[7.0].define(version: 2023_04_12_143245) do
     t.integer "discounted_sale_value_check"
     t.integer "student_not_child_value_check"
     t.integer "buyer_livein_value_check"
+    t.integer "percentage_discount_value_check"
     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"
     t.index ["old_id"], name: "index_sales_logs_on_old_id", unique: true
diff --git a/spec/models/form/sales/pages/percentage_discount_value_check_spec.rb b/spec/models/form/sales/pages/percentage_discount_value_check_spec.rb
new file mode 100644
index 000000000..d933e3278
--- /dev/null
+++ b/spec/models/form/sales/pages/percentage_discount_value_check_spec.rb
@@ -0,0 +1,48 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Pages::PercentageDiscountValueCheck, type: :model do
+  subject(:page) { described_class.new(page_id, page_definition, subsection) }
+
+  let(:page_id) { "percentage_discount_value_check" }
+  let(:page_definition) { nil }
+  let(:subsection) { instance_double(Form::Subsection) }
+
+  it "has correct subsection" do
+    expect(page.subsection).to eq(subsection)
+  end
+
+  it "has correct questions" do
+    expect(page.questions.map(&:id)).to eq(%w[percentage_discount_value_check])
+  end
+
+  it "has the correct id" do
+    expect(page.id).to eq("percentage_discount_value_check")
+  end
+
+  it "has the correct header" do
+    expect(page.header).to be_nil
+  end
+
+  it "has the correct title_text" do
+    expect(page.title_text).to eq({
+      "translation" => "soft_validations.percentage_discount_value.title_text",
+      "arguments" => [{ "key" => "discount", "label" => true, "i18n_template" => "discount" }],
+    })
+  end
+
+  it "has the correct informative_text" do
+    expect(page.informative_text).to eq({})
+  end
+
+  it "is interruption screen page" do
+    expect(page.interruption_screen?).to eq(true)
+  end
+
+  it "has correct depends_on" do
+    expect(page.depends_on).to eq([
+      {
+        "percentage_discount_invalid?" => true,
+      },
+    ])
+  end
+end
diff --git a/spec/models/form/sales/questions/percentage_discount_value_check_spec.rb b/spec/models/form/sales/questions/percentage_discount_value_check_spec.rb
new file mode 100644
index 000000000..72f4f0cbb
--- /dev/null
+++ b/spec/models/form/sales/questions/percentage_discount_value_check_spec.rb
@@ -0,0 +1,57 @@
+require "rails_helper"
+
+RSpec.describe Form::Sales::Questions::PercentageDiscountValueCheck, type: :model do
+  subject(:question) { described_class.new(question_id, question_definition, page) }
+
+  let(:question_id) { nil }
+  let(:question_definition) { nil }
+  let(:page) { instance_double(Form::Page) }
+
+  it "has correct page" do
+    expect(question.page).to eq(page)
+  end
+
+  it "has the correct id" do
+    expect(question.id).to eq("percentage_discount_value_check")
+  end
+
+  it "has the correct header" do
+    expect(question.header).to eq("Are you sure this is correct?")
+  end
+
+  it "has the correct check_answer_label" do
+    expect(question.check_answer_label).to eq("Percentage discount confirmation")
+  end
+
+  it "has the correct type" do
+    expect(question.type).to eq("interruption_screen")
+  end
+
+  it "is not marked as derived" do
+    expect(question.derived?).to be false
+  end
+
+  it "has the correct hint" do
+    expect(question.hint_text).to be_nil
+  end
+
+  it "has the correct answer_options" do
+    expect(question.answer_options).to eq({
+      "0" => { "value" => "Yes" },
+      "1" => { "value" => "No" },
+    })
+  end
+
+  it "has the correct hidden_in_check_answers" do
+    expect(question.hidden_in_check_answers).to eq({
+      "depends_on" => [
+        {
+          "percentage_discount_value_check" => 0,
+        },
+        {
+          "percentage_discount_value_check" => 1,
+        },
+      ],
+    })
+  end
+end
diff --git a/spec/models/form/sales/subsections/discounted_ownership_scheme_spec.rb b/spec/models/form/sales/subsections/discounted_ownership_scheme_spec.rb
index 5c0dbfea0..9aa0aa102 100644
--- a/spec/models/form/sales/subsections/discounted_ownership_scheme_spec.rb
+++ b/spec/models/form/sales/subsections/discounted_ownership_scheme_spec.rb
@@ -17,6 +17,7 @@ RSpec.describe Form::Sales::Subsections::DiscountedOwnershipScheme, type: :model
         living_before_purchase_discounted_ownership
         about_price_rtb
         extra_borrowing_price_value_check
+        percentage_discount_value_check
         about_price_not_rtb
         grant_value_check
         purchase_price_discounted_ownership
diff --git a/spec/models/form/sales/subsections/property_information_spec.rb b/spec/models/form/sales/subsections/property_information_spec.rb
index 1c049ea97..7a0c57448 100644
--- a/spec/models/form/sales/subsections/property_information_spec.rb
+++ b/spec/models/form/sales/subsections/property_information_spec.rb
@@ -24,6 +24,7 @@ RSpec.describe Form::Sales::Subsections::PropertyInformation, type: :model do
             about_price_bedrooms_value_check
             property_unit_type
             monthly_charges_property_type_value_check
+            percentage_discount_proptype_value_check
             property_building_type
             property_postcode
             property_local_authority
@@ -49,6 +50,7 @@ RSpec.describe Form::Sales::Subsections::PropertyInformation, type: :model do
             about_price_bedrooms_value_check
             property_unit_type
             monthly_charges_property_type_value_check
+            percentage_discount_proptype_value_check
             property_building_type
             about_price_la_value_check
             property_wheelchair_accessible
diff --git a/spec/models/validations/sales/soft_validations_spec.rb b/spec/models/validations/sales/soft_validations_spec.rb
index ae20e1111..f63f6fbcc 100644
--- a/spec/models/validations/sales/soft_validations_spec.rb
+++ b/spec/models/validations/sales/soft_validations_spec.rb
@@ -938,6 +938,32 @@ RSpec.describe Validations::Sales::SoftValidations do
         end
       end
     end
+  end
+
+  describe "#percentage_discount_invalid?" do
+    context "when property type is Flat (1)" do
+      let(:record) { FactoryBot.build(:sales_log, proptype: 1) }
+
+      context "and discount is under 50%" do
+        before do
+          record.discount = 49
+        end
+
+        it "returns false" do
+          expect(record).not_to be_percentage_discount_invalid
+        end
+      end
+
+      context "and discount is over 50%" do
+        before do
+          record.discount = 51
+        end
+
+        it "returns true" do
+          expect(record).to be_percentage_discount_invalid
+        end
+      end
+    end
 
     context "when it's a discounted ownership" do
       let(:record) { FactoryBot.build(:sales_log, ownershipsch: 2) }
@@ -963,6 +989,30 @@ RSpec.describe Validations::Sales::SoftValidations do
       end
     end
 
+    context "when property type is masionette or bedsit (2)" do
+      let(:record) { FactoryBot.build(:sales_log, proptype: 2) }
+
+      context "and discount is under 50%" do
+        before do
+          record.discount = 49
+        end
+
+        it "returns false" do
+          expect(record).not_to be_percentage_discount_invalid
+        end
+      end
+
+      context "and discount is over 50%" do
+        before do
+          record.discount = 51
+        end
+
+        it "returns true" do
+          expect(record).to be_percentage_discount_invalid
+        end
+      end
+    end
+
     context "when it's a outright sale" do
       let(:record) { FactoryBot.build(:sales_log, ownershipsch: 3) }
 
@@ -987,6 +1037,30 @@ RSpec.describe Validations::Sales::SoftValidations do
       end
     end
 
+    context "when property type is House (3)" do
+      let(:record) { FactoryBot.build(:sales_log, proptype: 3) }
+
+      context "and discount is under 35%" do
+        before do
+          record.discount = 34
+        end
+
+        it "returns false" do
+          expect(record).not_to be_percentage_discount_invalid
+        end
+      end
+
+      context "and discount is over 35%" do
+        before do
+          record.discount = 36
+        end
+
+        it "returns true" do
+          expect(record).to be_percentage_discount_invalid
+        end
+      end
+    end
+
     context "when ownership is not given" do
       let(:record) { FactoryBot.build(:sales_log, ownershipsch: 3) }
 
@@ -1095,5 +1169,69 @@ RSpec.describe Validations::Sales::SoftValidations do
         expect(record).not_to be_buyer2_livein_wrong_for_ownership_type
       end
     end
+
+    context "when property type is Bungalow (4)" do
+      let(:record) { FactoryBot.build(:sales_log, proptype: 4) }
+
+      context "and discount is under 35%" do
+        before do
+          record.discount = 34
+        end
+
+        it "returns false" do
+          expect(record).not_to be_percentage_discount_invalid
+        end
+      end
+
+      context "and discount is over 35%" do
+        before do
+          record.discount = 36
+        end
+
+        it "returns true" do
+          expect(record).to be_percentage_discount_invalid
+        end
+      end
+    end
+
+    context "when property type is Other (9)" do
+      let(:record) { FactoryBot.build(:sales_log, proptype: 9) }
+
+      context "and discount is under 35%" do
+        before do
+          record.discount = 34
+        end
+
+        it "returns false" do
+          expect(record).not_to be_percentage_discount_invalid
+        end
+      end
+
+      context "and discount is over 35%" do
+        before do
+          record.discount = 36
+        end
+
+        it "returns true" do
+          expect(record).to be_percentage_discount_invalid
+        end
+      end
+    end
+
+    context "when discount is not given" do
+      let(:record) { FactoryBot.build(:sales_log, proptype: 1, discount: nil) }
+
+      it "returns false" do
+        expect(record).not_to be_percentage_discount_invalid
+      end
+    end
+
+    context "when property type is not given" do
+      let(:record) { FactoryBot.build(:sales_log, proptype: nil, discount: 51) }
+
+      it "returns false" do
+        expect(record).not_to be_percentage_discount_invalid
+      end
+    end
   end
 end